New sample: Spring's schema registry + Kafka + Avro

schema-registry-samples/pom.xml

@@ -14,6 +14,7 @@
         <module>schema-registry-confluent</module>
         <module>schema-registry-confluent-avro-serializer</module>
         <module>kafka-streams-schema-evolution</module>
+        <module>spring-schema-registry-kafka-standalone</module>
     </modules>
 
 </project>

schema-registry-samples/spring-schema-registry-kafka-standalone/.gitignore

@@ -0,0 +1,33 @@
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/

schema-registry-samples/spring-schema-registry-kafka-standalone/.mvn/wrapper/MavenWrapperDownloader.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright 2007-present the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import java.net.*;
+import java.io.*;
+import java.nio.channels.*;
+import java.util.Properties;
+
+public class MavenWrapperDownloader {
+
+    private static final String WRAPPER_VERSION = "0.5.6";
+    /**
+     * Default URL to download the maven-wrapper.jar from, if no 'downloadUrl' is provided.
+     */
+    private static final String DEFAULT_DOWNLOAD_URL = "https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/"
+        + WRAPPER_VERSION + "/maven-wrapper-" + WRAPPER_VERSION + ".jar";
+
+    /**
+     * Path to the maven-wrapper.properties file, which might contain a downloadUrl property to
+     * use instead of the default one.
+     */
+    private static final String MAVEN_WRAPPER_PROPERTIES_PATH =
+            ".mvn/wrapper/maven-wrapper.properties";
+
+    /**
+     * Path where the maven-wrapper.jar will be saved to.
+     */
+    private static final String MAVEN_WRAPPER_JAR_PATH =
+            ".mvn/wrapper/maven-wrapper.jar";
+
+    /**
+     * Name of the property which should be used to override the default download url for the wrapper.
+     */
+    private static final String PROPERTY_NAME_WRAPPER_URL = "wrapperUrl";
+
+    public static void main(String args[]) {
+        System.out.println("- Downloader started");
+        File baseDirectory = new File(args[0]);
+        System.out.println("- Using base directory: " + baseDirectory.getAbsolutePath());
+
+        // If the maven-wrapper.properties exists, read it and check if it contains a custom
+        // wrapperUrl parameter.
+        File mavenWrapperPropertyFile = new File(baseDirectory, MAVEN_WRAPPER_PROPERTIES_PATH);
+        String url = DEFAULT_DOWNLOAD_URL;
+        if(mavenWrapperPropertyFile.exists()) {
+            FileInputStream mavenWrapperPropertyFileInputStream = null;
+            try {
+                mavenWrapperPropertyFileInputStream = new FileInputStream(mavenWrapperPropertyFile);
+                Properties mavenWrapperProperties = new Properties();
+                mavenWrapperProperties.load(mavenWrapperPropertyFileInputStream);
+                url = mavenWrapperProperties.getProperty(PROPERTY_NAME_WRAPPER_URL, url);
+            } catch (IOException e) {
+                System.out.println("- ERROR loading '" + MAVEN_WRAPPER_PROPERTIES_PATH + "'");
+            } finally {
+                try {
+                    if(mavenWrapperPropertyFileInputStream != null) {
+                        mavenWrapperPropertyFileInputStream.close();
+                    }
+                } catch (IOException e) {
+                    // Ignore ...
+                }
+            }
+        }
+        System.out.println("- Downloading from: " + url);
+
+        File outputFile = new File(baseDirectory.getAbsolutePath(), MAVEN_WRAPPER_JAR_PATH);
+        if(!outputFile.getParentFile().exists()) {
+            if(!outputFile.getParentFile().mkdirs()) {
+                System.out.println(
+                        "- ERROR creating output directory '" + outputFile.getParentFile().getAbsolutePath() + "'");
+            }
+        }
+        System.out.println("- Downloading to: " + outputFile.getAbsolutePath());
+        try {
+            downloadFileFromURL(url, outputFile);
+            System.out.println("Done");
+            System.exit(0);
+        } catch (Throwable e) {
+            System.out.println("- Error downloading");
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private static void downloadFileFromURL(String urlString, File destination) throws Exception {
+        if (System.getenv("MVNW_USERNAME") != null && System.getenv("MVNW_PASSWORD") != null) {
+            String username = System.getenv("MVNW_USERNAME");
+            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
+            Authenticator.setDefault(new Authenticator() {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication() {
+                    return new PasswordAuthentication(username, password);
+                }
+            });
+        }
+        URL website = new URL(urlString);
+        ReadableByteChannel rbc;
+        rbc = Channels.newChannel(website.openStream());
+        FileOutputStream fos = new FileOutputStream(destination);
+        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
+        fos.close();
+        rbc.close();
+    }
+
+}

schema-registry-samples/spring-schema-registry-kafka-standalone/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,2 @@
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.3/apache-maven-3.6.3-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar

schema-registry-samples/spring-schema-registry-kafka-standalone/README.adoc

@@ -0,0 +1,37 @@
+== Spring Schema Registry + Kafka Standalone
+
+This sample application will demonstrate the combination of Spring's schema registry + Kafka + avro.
+
+=== Running the application
+
+- Start Kafka
+
+[source,bash]
+----
+docker-compose up -d
+----
+
+- Start the Schema Registry server (Chnage these commands accordingly if you are not on a Unix like platform)
+[source,bash]
+----
+wget -O /tmp/schema-registry-server.jar https://repo.maven.apache.org/maven2/org/springframework/cloud/spring-cloud-schema-registry-client/1.0.9.RELEASE//spring-cloud-schema-registry-server-1.0.9.RELEASE.jar
+cd /tmp
+----
+
+Start the Schema Registry server using in-memory H2 database:
+[source,bash]
+----
+java -jar schema-registry-server-1.0.9.RELEASE.jar
+----
+
+You might have to build this application to generate the avro classes.
+For that, use the build command: `./mvnw clean package` (Or you can use your IDE plugins to generate the avro classes)
+
+Then run this application.
+You should see a one-time `Sensor` output from the consumer in the application (which is originally produced by the `CommandlineRunner`).
+
+=== Cleanup
+
+Once you are done with running the sample, stop the docker container.
+
+`docker-compose down`

schema-registry-samples/spring-schema-registry-kafka-standalone/docker-compose.yml

@@ -0,0 +1,19 @@
+version: '3'
+services:
+  kafka:
+    image: wurstmeister/kafka
+    container_name: spring-schema-registry-kafka
+    ports:
+      - "9092:9092"
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=127.0.0.1
+      - KAFKA_ADVERTISED_PORT=9092
+      - KAFKA_ZOOKEEPER_CONNECT=zookeeper:2181
+    depends_on:
+      - zookeeper
+  zookeeper:
+    image: wurstmeister/zookeeper
+    ports:
+      - "2181:2181"
+    environment:
+      - KAFKA_ADVERTISED_HOST_NAME=zookeeper

schema-registry-samples/spring-schema-registry-kafka-standalone/mvnw

@@ -0,0 +1,310 @@
+#!/bin/sh
+# ----------------------------------------------------------------------------
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# ----------------------------------------------------------------------------
+
+# ----------------------------------------------------------------------------
+# Maven Start Up Batch script
+#
+# Required ENV vars:
+# ------------------
+#   JAVA_HOME - location of a JDK home dir
+#
+# Optional ENV vars
+# -----------------
+#   M2_HOME - location of maven2's installed home dir
+#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
+#     e.g. to debug Maven itself, use
+#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+#   MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+# ----------------------------------------------------------------------------
+
+if [ -z "$MAVEN_SKIP_RC" ] ; then
+
+  if [ -f /etc/mavenrc ] ; then
+    . /etc/mavenrc
+  fi
+
+  if [ -f "$HOME/.mavenrc" ] ; then
+    . "$HOME/.mavenrc"
+  fi
+
+fi
+
+# OS specific support.  $var _must_ be set to either true or false.
+cygwin=false;
+darwin=false;
+mingw=false
+case "`uname`" in
+  CYGWIN*) cygwin=true ;;
+  MINGW*) mingw=true;;
+  Darwin*) darwin=true
+    # Use /usr/libexec/java_home if available, otherwise fall back to /Library/Java/Home
+    # See https://developer.apple.com/library/mac/qa/qa1170/_index.html
+    if [ -z "$JAVA_HOME" ]; then
+      if [ -x "/usr/libexec/java_home" ]; then
+        export JAVA_HOME="`/usr/libexec/java_home`"
+      else
+        export JAVA_HOME="/Library/Java/Home"
+      fi
+    fi
+    ;;
+esac
+
+if [ -z "$JAVA_HOME" ] ; then
+  if [ -r /etc/gentoo-release ] ; then
+    JAVA_HOME=`java-config --jre-home`
+  fi
+fi
+
+if [ -z "$M2_HOME" ] ; then
+  ## resolve links - $0 may be a link to maven's home
+  PRG="$0"
+
+  # need this for relative symlinks
+  while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+      PRG="$link"
+    else
+      PRG="`dirname "$PRG"`/$link"
+    fi
+  done
+
+  saveddir=`pwd`
+
+  M2_HOME=`dirname "$PRG"`/..
+
+  # make it fully qualified
+  M2_HOME=`cd "$M2_HOME" && pwd`
+
+  cd "$saveddir"
+  # echo Using m2 at $M2_HOME
+fi
+
+# For Cygwin, ensure paths are in UNIX format before anything is touched
+if $cygwin ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --unix "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --unix "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --unix "$CLASSPATH"`
+fi
+
+# For Mingw, ensure paths are in UNIX format before anything is touched
+if $mingw ; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME="`(cd "$M2_HOME"; pwd)`"
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME="`(cd "$JAVA_HOME"; pwd)`"
+fi
+
+if [ -z "$JAVA_HOME" ]; then
+  javaExecutable="`which javac`"
+  if [ -n "$javaExecutable" ] && ! [ "`expr \"$javaExecutable\" : '\([^ ]*\)'`" = "no" ]; then
+    # readlink(1) is not available as standard on Solaris 10.
+    readLink=`which readlink`
+    if [ ! `expr "$readLink" : '\([^ ]*\)'` = "no" ]; then
+      if $darwin ; then
+        javaHome="`dirname \"$javaExecutable\"`"
+        javaExecutable="`cd \"$javaHome\" && pwd -P`/javac"
+      else
+        javaExecutable="`readlink -f \"$javaExecutable\"`"
+      fi
+      javaHome="`dirname \"$javaExecutable\"`"
+      javaHome=`expr "$javaHome" : '\(.*\)/bin'`
+      JAVA_HOME="$javaHome"
+      export JAVA_HOME
+    fi
+  fi
+fi
+
+if [ -z "$JAVACMD" ] ; then
+  if [ -n "$JAVA_HOME"  ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+      # IBM's JDK on AIX uses strange locations for the executables
+      JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+      JAVACMD="$JAVA_HOME/bin/java"
+    fi
+  else
+    JAVACMD="`which java`"
+  fi
+fi
+
+if [ ! -x "$JAVACMD" ] ; then
+  echo "Error: JAVA_HOME is not defined correctly." >&2
+  echo "  We cannot execute $JAVACMD" >&2
+  exit 1
+fi
+
+if [ -z "$JAVA_HOME" ] ; then
+  echo "Warning: JAVA_HOME environment variable is not set."
+fi
+
+CLASSWORLDS_LAUNCHER=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# traverses directory structure from process work directory to filesystem root
+# first directory with .mvn subdirectory is considered project base directory
+find_maven_basedir() {
+
+  if [ -z "$1" ]
+  then
+    echo "Path not specified to find_maven_basedir"
+    return 1
+  fi
+
+  basedir="$1"
+  wdir="$1"
+  while [ "$wdir" != '/' ] ; do
+    if [ -d "$wdir"/.mvn ] ; then
+      basedir=$wdir
+      break
+    fi
+    # workaround for JBEAP-8937 (on Solaris 10/Sparc)
+    if [ -d "${wdir}" ]; then
+      wdir=`cd "$wdir/.."; pwd`
+    fi
+    # end of workaround
+  done
+  echo "${basedir}"
+}
+
+# concatenates all lines of a file
+concat_lines() {
+  if [ -f "$1" ]; then
+    echo "$(tr -s '\n' ' ' < "$1")"
+  fi
+}
+
+BASE_DIR=`find_maven_basedir "$(pwd)"`
+if [ -z "$BASE_DIR" ]; then
+  exit 1;
+fi
+
+##########################################################################################
+# Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+# This allows using the maven wrapper in projects that prohibit checking in binary data.
+##########################################################################################
+if [ -r "$BASE_DIR/.mvn/wrapper/maven-wrapper.jar" ]; then
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Found .mvn/wrapper/maven-wrapper.jar"
+    fi
+else
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Couldn't find .mvn/wrapper/maven-wrapper.jar, downloading it ..."
+    fi
+    if [ -n "$MVNW_REPOURL" ]; then
+      jarUrl="$MVNW_REPOURL/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    else
+      jarUrl="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    fi
+    while IFS="=" read key value; do
+      case "$key" in (wrapperUrl) jarUrl="$value"; break ;;
+      esac
+    done < "$BASE_DIR/.mvn/wrapper/maven-wrapper.properties"
+    if [ "$MVNW_VERBOSE" = true ]; then
+      echo "Downloading from: $jarUrl"
+    fi
+    wrapperJarPath="$BASE_DIR/.mvn/wrapper/maven-wrapper.jar"
+    if $cygwin; then
+      wrapperJarPath=`cygpath --path --windows "$wrapperJarPath"`
+    fi
+
+    if command -v wget > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found wget ... using wget"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            wget "$jarUrl" -O "$wrapperJarPath"
+        else
+            wget --http-user=$MVNW_USERNAME --http-password=$MVNW_PASSWORD "$jarUrl" -O "$wrapperJarPath"
+        fi
+    elif command -v curl > /dev/null; then
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Found curl ... using curl"
+        fi
+        if [ -z "$MVNW_USERNAME" ] || [ -z "$MVNW_PASSWORD" ]; then
+            curl -o "$wrapperJarPath" "$jarUrl" -f
+        else
+            curl --user $MVNW_USERNAME:$MVNW_PASSWORD -o "$wrapperJarPath" "$jarUrl" -f
+        fi
+
+    else
+        if [ "$MVNW_VERBOSE" = true ]; then
+          echo "Falling back to using Java to download"
+        fi
+        javaClass="$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.java"
+        # For Cygwin, switch paths to Windows format before running javac
+        if $cygwin; then
+          javaClass=`cygpath --path --windows "$javaClass"`
+        fi
+        if [ -e "$javaClass" ]; then
+            if [ ! -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Compiling MavenWrapperDownloader.java ..."
+                fi
+                # Compiling the Java class
+                ("$JAVA_HOME/bin/javac" "$javaClass")
+            fi
+            if [ -e "$BASE_DIR/.mvn/wrapper/MavenWrapperDownloader.class" ]; then
+                # Running the downloader
+                if [ "$MVNW_VERBOSE" = true ]; then
+                  echo " - Running MavenWrapperDownloader.java ..."
+                fi
+                ("$JAVA_HOME/bin/java" -cp .mvn/wrapper MavenWrapperDownloader "$MAVEN_PROJECTBASEDIR")
+            fi
+        fi
+    fi
+fi
+##########################################################################################
+# End of extension
+##########################################################################################
+
+export MAVEN_PROJECTBASEDIR=${MAVEN_BASEDIR:-"$BASE_DIR"}
+if [ "$MVNW_VERBOSE" = true ]; then
+  echo $MAVEN_PROJECTBASEDIR
+fi
+MAVEN_OPTS="$(concat_lines "$MAVEN_PROJECTBASEDIR/.mvn/jvm.config") $MAVEN_OPTS"
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin; then
+  [ -n "$M2_HOME" ] &&
+    M2_HOME=`cygpath --path --windows "$M2_HOME"`
+  [ -n "$JAVA_HOME" ] &&
+    JAVA_HOME=`cygpath --path --windows "$JAVA_HOME"`
+  [ -n "$CLASSPATH" ] &&
+    CLASSPATH=`cygpath --path --windows "$CLASSPATH"`
+  [ -n "$MAVEN_PROJECTBASEDIR" ] &&
+    MAVEN_PROJECTBASEDIR=`cygpath --path --windows "$MAVEN_PROJECTBASEDIR"`
+fi
+
+# Provide a "standardized" way to retrieve the CLI args that will
+# work with both Windows and non-Windows executions.
+MAVEN_CMD_LINE_ARGS="$MAVEN_CONFIG $@"
+export MAVEN_CMD_LINE_ARGS
+
+WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+exec "$JAVACMD" \
+  $MAVEN_OPTS \
+  -classpath "$MAVEN_PROJECTBASEDIR/.mvn/wrapper/maven-wrapper.jar" \
+  "-Dmaven.home=${M2_HOME}" "-Dmaven.multiModuleProjectDirectory=${MAVEN_PROJECTBASEDIR}" \
+  ${WRAPPER_LAUNCHER} $MAVEN_CONFIG "$@"

schema-registry-samples/spring-schema-registry-kafka-standalone/mvnw.cmd

@@ -0,0 +1,182 @@
+@REM ----------------------------------------------------------------------------
+@REM Licensed to the Apache Software Foundation (ASF) under one
+@REM or more contributor license agreements.  See the NOTICE file
+@REM distributed with this work for additional information
+@REM regarding copyright ownership.  The ASF licenses this file
+@REM to you under the Apache License, Version 2.0 (the
+@REM "License"); you may not use this file except in compliance
+@REM with the License.  You may obtain a copy of the License at
+@REM
+@REM    https://www.apache.org/licenses/LICENSE-2.0
+@REM
+@REM Unless required by applicable law or agreed to in writing,
+@REM software distributed under the License is distributed on an
+@REM "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+@REM KIND, either express or implied.  See the License for the
+@REM specific language governing permissions and limitations
+@REM under the License.
+@REM ----------------------------------------------------------------------------
+
+@REM ----------------------------------------------------------------------------
+@REM Maven Start Up Batch script
+@REM
+@REM Required ENV vars:
+@REM JAVA_HOME - location of a JDK home dir
+@REM
+@REM Optional ENV vars
+@REM M2_HOME - location of maven2's installed home dir
+@REM MAVEN_BATCH_ECHO - set to 'on' to enable the echoing of the batch commands
+@REM MAVEN_BATCH_PAUSE - set to 'on' to wait for a keystroke before ending
+@REM MAVEN_OPTS - parameters passed to the Java VM when running Maven
+@REM     e.g. to debug Maven itself, use
+@REM set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
+@REM MAVEN_SKIP_RC - flag to disable loading of mavenrc files
+@REM ----------------------------------------------------------------------------
+
+@REM Begin all REM lines with '@' in case MAVEN_BATCH_ECHO is 'on'
+@echo off
+@REM set title of command window
+title %0
+@REM enable echoing by setting MAVEN_BATCH_ECHO to 'on'
+@if "%MAVEN_BATCH_ECHO%" == "on"  echo %MAVEN_BATCH_ECHO%
+
+@REM set %HOME% to equivalent of $HOME
+if "%HOME%" == "" (set "HOME=%HOMEDRIVE%%HOMEPATH%")
+
+@REM Execute a user defined script before this one
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPre
+@REM check for pre script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_pre.bat" call "%HOME%\mavenrc_pre.bat"
+if exist "%HOME%\mavenrc_pre.cmd" call "%HOME%\mavenrc_pre.cmd"
+:skipRcPre
+
+@setlocal
+
+set ERROR_CODE=0
+
+@REM To isolate internal variables from possible post scripts, we use another setlocal
+@setlocal
+
+@REM ==== START VALIDATION ====
+if not "%JAVA_HOME%" == "" goto OkJHome
+
+echo.
+echo Error: JAVA_HOME not found in your environment. >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+:OkJHome
+if exist "%JAVA_HOME%\bin\java.exe" goto init
+
+echo.
+echo Error: JAVA_HOME is set to an invalid directory. >&2
+echo JAVA_HOME = "%JAVA_HOME%" >&2
+echo Please set the JAVA_HOME variable in your environment to match the >&2
+echo location of your Java installation. >&2
+echo.
+goto error
+
+@REM ==== END VALIDATION ====
+
+:init
+
+@REM Find the project base dir, i.e. the directory that contains the folder ".mvn".
+@REM Fallback to current working directory if not found.
+
+set MAVEN_PROJECTBASEDIR=%MAVEN_BASEDIR%
+IF NOT "%MAVEN_PROJECTBASEDIR%"=="" goto endDetectBaseDir
+
+set EXEC_DIR=%CD%
+set WDIR=%EXEC_DIR%
+:findBaseDir
+IF EXIST "%WDIR%"\.mvn goto baseDirFound
+cd ..
+IF "%WDIR%"=="%CD%" goto baseDirNotFound
+set WDIR=%CD%
+goto findBaseDir
+
+:baseDirFound
+set MAVEN_PROJECTBASEDIR=%WDIR%
+cd "%EXEC_DIR%"
+goto endDetectBaseDir
+
+:baseDirNotFound
+set MAVEN_PROJECTBASEDIR=%EXEC_DIR%
+cd "%EXEC_DIR%"
+
+:endDetectBaseDir
+
+IF NOT EXIST "%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config" goto endReadAdditionalConfig
+
+@setlocal EnableExtensions EnableDelayedExpansion
+for /F "usebackq delims=" %%a in ("%MAVEN_PROJECTBASEDIR%\.mvn\jvm.config") do set JVM_CONFIG_MAVEN_PROPS=!JVM_CONFIG_MAVEN_PROPS! %%a
+@endlocal & set JVM_CONFIG_MAVEN_PROPS=%JVM_CONFIG_MAVEN_PROPS%
+
+:endReadAdditionalConfig
+
+SET MAVEN_JAVA_EXE="%JAVA_HOME%\bin\java.exe"
+set WRAPPER_JAR="%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.jar"
+set WRAPPER_LAUNCHER=org.apache.maven.wrapper.MavenWrapperMain
+
+set DOWNLOAD_URL="https://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+
+FOR /F "tokens=1,2 delims==" %%A IN ("%MAVEN_PROJECTBASEDIR%\.mvn\wrapper\maven-wrapper.properties") DO (
+    IF "%%A"=="wrapperUrl" SET DOWNLOAD_URL=%%B
+)
+
+@REM Extension to allow automatically downloading the maven-wrapper.jar from Maven-central
+@REM This allows using the maven wrapper in projects that prohibit checking in binary data.
+if exist %WRAPPER_JAR% (
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Found %WRAPPER_JAR%
+    )
+) else (
+    if not "%MVNW_REPOURL%" == "" (
+        SET DOWNLOAD_URL="%MVNW_REPOURL%/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar"
+    )
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Couldn't find %WRAPPER_JAR%, downloading it ...
+        echo Downloading from: %DOWNLOAD_URL%
+    )
+
+    powershell -Command "&{"^
+		"$webclient = new-object System.Net.WebClient;"^
+		"if (-not ([string]::IsNullOrEmpty('%MVNW_USERNAME%') -and [string]::IsNullOrEmpty('%MVNW_PASSWORD%'))) {"^
+		"$webclient.Credentials = new-object System.Net.NetworkCredential('%MVNW_USERNAME%', '%MVNW_PASSWORD%');"^
+		"}"^
+		"[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12; $webclient.DownloadFile('%DOWNLOAD_URL%', '%WRAPPER_JAR%')"^
+		"}"
+    if "%MVNW_VERBOSE%" == "true" (
+        echo Finished downloading %WRAPPER_JAR%
+    )
+)
+@REM End of extension
+
+@REM Provide a "standardized" way to retrieve the CLI args that will
+@REM work with both Windows and non-Windows executions.
+set MAVEN_CMD_LINE_ARGS=%*
+
+%MAVEN_JAVA_EXE% %JVM_CONFIG_MAVEN_PROPS% %MAVEN_OPTS% %MAVEN_DEBUG_OPTS% -classpath %WRAPPER_JAR% "-Dmaven.multiModuleProjectDirectory=%MAVEN_PROJECTBASEDIR%" %WRAPPER_LAUNCHER% %MAVEN_CONFIG% %*
+if ERRORLEVEL 1 goto error
+goto end
+
+:error
+set ERROR_CODE=1
+
+:end
+@endlocal & set ERROR_CODE=%ERROR_CODE%
+
+if not "%MAVEN_SKIP_RC%" == "" goto skipRcPost
+@REM check for post script, once with legacy .bat ending and once with .cmd ending
+if exist "%HOME%\mavenrc_post.bat" call "%HOME%\mavenrc_post.bat"
+if exist "%HOME%\mavenrc_post.cmd" call "%HOME%\mavenrc_post.cmd"
+:skipRcPost
+
+@REM pause the script if MAVEN_BATCH_PAUSE is set to 'on'
+if "%MAVEN_BATCH_PAUSE%" == "on" pause
+
+if "%MAVEN_TERMINATE_CMD%" == "on" exit %ERROR_CODE%
+
+exit /B %ERROR_CODE%

schema-registry-samples/spring-schema-registry-kafka-standalone/pom.xml

@@ -0,0 +1,110 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<parent>
+		<groupId>org.springframework.boot</groupId>
+		<artifactId>spring-boot-starter-parent</artifactId>
+		<version>2.3.8.RELEASE</version>
+		<relativePath/> <!-- lookup parent from repository -->
+	</parent>
+	<groupId>com.example</groupId>
+	<artifactId>spring-schema-registry-kafka-standalone</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>spring-schema-registry-kafka-standalone</name>
+	<description>Demo project for Spring Boot</description>
+	<properties>
+		<java.version>8</java.version>
+		<spring-cloud.version>Hoxton.SR9</spring-cloud.version>
+	</properties>
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream-binder-kafka</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-schema-registry-client</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka</artifactId>
+		</dependency>
+
+		<dependency>
+			<groupId>org.apache.avro</groupId>
+			<artifactId>avro</artifactId>
+			<version>1.10.0</version>
+		</dependency>
+
+		<dependency>
+			<groupId>org.springframework.boot</groupId>
+			<artifactId>spring-boot-starter-test</artifactId>
+			<scope>test</scope>
+			<exclusions>
+				<exclusion>
+					<groupId>org.junit.vintage</groupId>
+					<artifactId>junit-vintage-engine</artifactId>
+				</exclusion>
+			</exclusions>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.cloud</groupId>
+			<artifactId>spring-cloud-stream</artifactId>
+			<scope>test</scope>
+			<classifier>test-binder</classifier>
+			<type>test-jar</type>
+		</dependency>
+		<dependency>
+			<groupId>org.springframework.kafka</groupId>
+			<artifactId>spring-kafka-test</artifactId>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+	<dependencyManagement>
+		<dependencies>
+			<dependency>
+				<groupId>org.springframework.cloud</groupId>
+				<artifactId>spring-cloud-dependencies</artifactId>
+				<version>${spring-cloud.version}</version>
+				<type>pom</type>
+				<scope>import</scope>
+			</dependency>
+		</dependencies>
+	</dependencyManagement>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+
+			<plugin>
+				<groupId>org.apache.avro</groupId>
+				<artifactId>avro-maven-plugin</artifactId>
+				<version>1.10.0</version>
+				<executions>
+					<execution>
+						<id>schemas</id>
+						<phase>generate-sources</phase>
+						<goals>
+							<goal>schema</goal>
+							<goal>protocol</goal>
+							<goal>idl-protocol</goal>
+						</goals>
+						<configuration>
+							<sourceDirectory>${project.basedir}/src/main/resources/avro</sourceDirectory>
+							<outputDirectory>${project.basedir}/src/main/java/</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

schema-registry-samples/spring-schema-registry-kafka-standalone/src/main/java/com/example/SchemaRegistryKafkaStandalone.java

@@ -0,0 +1,50 @@
+package com.example;
+
+import java.util.Random;
+import java.util.function.Consumer;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.schema.registry.client.EnableSchemaRegistryClient;
+import org.springframework.cloud.stream.function.StreamBridge;
+import org.springframework.context.annotation.Bean;
+import org.springframework.util.MimeType;
+
+@SpringBootApplication
+@EnableSchemaRegistryClient
+public class SchemaRegistryKafkaStandalone implements CommandLineRunner {
+
+	@Autowired
+	private StreamBridge streamBridge;
+
+	public static void main(String[] args) {
+		SpringApplication.run(SchemaRegistryKafkaStandalone.class, args);
+	}
+
+	@Override
+	public void run(String... args) throws Exception {
+		Random random = new Random();
+		Sensor sensor = Sensor.newBuilder()
+				.setId("sensor")
+				.setAcceleration(random.nextFloat())
+				.setTemperature(random.nextFloat())
+				.setVelocity(random.nextFloat())
+				.build();
+		send(sensor);
+	}
+
+	void send(Sensor sensor) {
+		streamBridge.send("sensor", sensor, MimeType.valueOf("application/+avro"));
+	}
+
+	@Bean
+	public Consumer<Sensor> consume() {
+		return (sensor) -> {
+			System.out.println("Received Type:" + sensor.getClass().getCanonicalName());
+			System.out.println("Received:" + sensor);
+		};
+	}
+
+}

schema-registry-samples/spring-schema-registry-kafka-standalone/src/main/java/com/example/Sensor.java

@@ -0,0 +1,548 @@
+/**
+ * Autogenerated by Avro
+ *
+ * DO NOT EDIT DIRECTLY
+ */
+package com.example;
+
+import org.apache.avro.generic.GenericArray;
+import org.apache.avro.specific.SpecificData;
+import org.apache.avro.util.Utf8;
+import org.apache.avro.message.BinaryMessageEncoder;
+import org.apache.avro.message.BinaryMessageDecoder;
+import org.apache.avro.message.SchemaStore;
+
+@org.apache.avro.specific.AvroGenerated
+public class Sensor extends org.apache.avro.specific.SpecificRecordBase implements org.apache.avro.specific.SpecificRecord {
+  private static final long serialVersionUID = 1196898085889970034L;
+  public static final org.apache.avro.Schema SCHEMA$ = new org.apache.avro.Schema.Parser().parse("{\"type\":\"record\",\"name\":\"Sensor\",\"namespace\":\"com.example\",\"fields\":[{\"name\":\"id\",\"type\":\"string\"},{\"name\":\"temperature\",\"type\":\"float\",\"default\":0.0},{\"name\":\"acceleration\",\"type\":\"float\",\"default\":0.0},{\"name\":\"velocity\",\"type\":\"float\",\"default\":0.0}]}");
+  public static org.apache.avro.Schema getClassSchema() { return SCHEMA$; }
+
+  private static SpecificData MODEL$ = new SpecificData();
+
+  private static final BinaryMessageEncoder<Sensor> ENCODER =
+      new BinaryMessageEncoder<Sensor>(MODEL$, SCHEMA$);
+
+  private static final BinaryMessageDecoder<Sensor> DECODER =
+      new BinaryMessageDecoder<Sensor>(MODEL$, SCHEMA$);
+
+  /**
+   * Return the BinaryMessageEncoder instance used by this class.
+   * @return the message encoder used by this class
+   */
+  public static BinaryMessageEncoder<Sensor> getEncoder() {
+    return ENCODER;
+  }
+
+  /**
+   * Return the BinaryMessageDecoder instance used by this class.
+   * @return the message decoder used by this class
+   */
+  public static BinaryMessageDecoder<Sensor> getDecoder() {
+    return DECODER;
+  }
+
+  /**
+   * Create a new BinaryMessageDecoder instance for this class that uses the specified {@link SchemaStore}.
+   * @param resolver a {@link SchemaStore} used to find schemas by fingerprint
+   * @return a BinaryMessageDecoder instance for this class backed by the given SchemaStore
+   */
+  public static BinaryMessageDecoder<Sensor> createDecoder(SchemaStore resolver) {
+    return new BinaryMessageDecoder<Sensor>(MODEL$, SCHEMA$, resolver);
+  }
+
+  /**
+   * Serializes this Sensor to a ByteBuffer.
+   * @return a buffer holding the serialized data for this instance
+   * @throws java.io.IOException if this instance could not be serialized
+   */
+  public java.nio.ByteBuffer toByteBuffer() throws java.io.IOException {
+    return ENCODER.encode(this);
+  }
+
+  /**
+   * Deserializes a Sensor from a ByteBuffer.
+   * @param b a byte buffer holding serialized data for an instance of this class
+   * @return a Sensor instance decoded from the given buffer
+   * @throws java.io.IOException if the given bytes could not be deserialized into an instance of this class
+   */
+  public static Sensor fromByteBuffer(
+      java.nio.ByteBuffer b) throws java.io.IOException {
+    return DECODER.decode(b);
+  }
+
+   private java.lang.CharSequence id;
+   private float temperature;
+   private float acceleration;
+   private float velocity;
+
+  /**
+   * Default constructor.  Note that this does not initialize fields
+   * to their default values from the schema.  If that is desired then
+   * one should use <code>newBuilder()</code>.
+   */
+  public Sensor() {}
+
+  /**
+   * All-args constructor.
+   * @param id The new value for id
+   * @param temperature The new value for temperature
+   * @param acceleration The new value for acceleration
+   * @param velocity The new value for velocity
+   */
+  public Sensor(java.lang.CharSequence id, java.lang.Float temperature, java.lang.Float acceleration, java.lang.Float velocity) {
+    this.id = id;
+    this.temperature = temperature;
+    this.acceleration = acceleration;
+    this.velocity = velocity;
+  }
+
+  public org.apache.avro.specific.SpecificData getSpecificData() { return MODEL$; }
+  public org.apache.avro.Schema getSchema() { return SCHEMA$; }
+  // Used by DatumWriter.  Applications should not call.
+  public java.lang.Object get(int field$) {
+    switch (field$) {
+    case 0: return id;
+    case 1: return temperature;
+    case 2: return acceleration;
+    case 3: return velocity;
+    default: throw new IndexOutOfBoundsException("Invalid index: " + field$);
+    }
+  }
+
+  // Used by DatumReader.  Applications should not call.
+  @SuppressWarnings(value="unchecked")
+  public void put(int field$, java.lang.Object value$) {
+    switch (field$) {
+    case 0: id = (java.lang.CharSequence)value$; break;
+    case 1: temperature = (java.lang.Float)value$; break;
+    case 2: acceleration = (java.lang.Float)value$; break;
+    case 3: velocity = (java.lang.Float)value$; break;
+    default: throw new IndexOutOfBoundsException("Invalid index: " + field$);
+    }
+  }
+
+  /**
+   * Gets the value of the 'id' field.
+   * @return The value of the 'id' field.
+   */
+  public java.lang.CharSequence getId() {
+    return id;
+  }
+
+
+  /**
+   * Sets the value of the 'id' field.
+   * @param value the value to set.
+   */
+  public void setId(java.lang.CharSequence value) {
+    this.id = value;
+  }
+
+  /**
+   * Gets the value of the 'temperature' field.
+   * @return The value of the 'temperature' field.
+   */
+  public float getTemperature() {
+    return temperature;
+  }
+
+
+  /**
+   * Sets the value of the 'temperature' field.
+   * @param value the value to set.
+   */
+  public void setTemperature(float value) {
+    this.temperature = value;
+  }
+
+  /**
+   * Gets the value of the 'acceleration' field.
+   * @return The value of the 'acceleration' field.
+   */
+  public float getAcceleration() {
+    return acceleration;
+  }
+
+
+  /**
+   * Sets the value of the 'acceleration' field.
+   * @param value the value to set.
+   */
+  public void setAcceleration(float value) {
+    this.acceleration = value;
+  }
+
+  /**
+   * Gets the value of the 'velocity' field.
+   * @return The value of the 'velocity' field.
+   */
+  public float getVelocity() {
+    return velocity;
+  }
+
+
+  /**
+   * Sets the value of the 'velocity' field.
+   * @param value the value to set.
+   */
+  public void setVelocity(float value) {
+    this.velocity = value;
+  }
+
+  /**
+   * Creates a new Sensor RecordBuilder.
+   * @return A new Sensor RecordBuilder
+   */
+  public static com.example.Sensor.Builder newBuilder() {
+    return new com.example.Sensor.Builder();
+  }
+
+  /**
+   * Creates a new Sensor RecordBuilder by copying an existing Builder.
+   * @param other The existing builder to copy.
+   * @return A new Sensor RecordBuilder
+   */
+  public static com.example.Sensor.Builder newBuilder(com.example.Sensor.Builder other) {
+    if (other == null) {
+      return new com.example.Sensor.Builder();
+    } else {
+      return new com.example.Sensor.Builder(other);
+    }
+  }
+
+  /**
+   * Creates a new Sensor RecordBuilder by copying an existing Sensor instance.
+   * @param other The existing instance to copy.
+   * @return A new Sensor RecordBuilder
+   */
+  public static com.example.Sensor.Builder newBuilder(com.example.Sensor other) {
+    if (other == null) {
+      return new com.example.Sensor.Builder();
+    } else {
+      return new com.example.Sensor.Builder(other);
+    }
+  }
+
+  /**
+   * RecordBuilder for Sensor instances.
+   */
+  @org.apache.avro.specific.AvroGenerated
+  public static class Builder extends org.apache.avro.specific.SpecificRecordBuilderBase<Sensor>
+    implements org.apache.avro.data.RecordBuilder<Sensor> {
+
+    private java.lang.CharSequence id;
+    private float temperature;
+    private float acceleration;
+    private float velocity;
+
+    /** Creates a new Builder */
+    private Builder() {
+      super(SCHEMA$);
+    }
+
+    /**
+     * Creates a Builder by copying an existing Builder.
+     * @param other The existing Builder to copy.
+     */
+    private Builder(com.example.Sensor.Builder other) {
+      super(other);
+      if (isValidValue(fields()[0], other.id)) {
+        this.id = data().deepCopy(fields()[0].schema(), other.id);
+        fieldSetFlags()[0] = other.fieldSetFlags()[0];
+      }
+      if (isValidValue(fields()[1], other.temperature)) {
+        this.temperature = data().deepCopy(fields()[1].schema(), other.temperature);
+        fieldSetFlags()[1] = other.fieldSetFlags()[1];
+      }
+      if (isValidValue(fields()[2], other.acceleration)) {
+        this.acceleration = data().deepCopy(fields()[2].schema(), other.acceleration);
+        fieldSetFlags()[2] = other.fieldSetFlags()[2];
+      }
+      if (isValidValue(fields()[3], other.velocity)) {
+        this.velocity = data().deepCopy(fields()[3].schema(), other.velocity);
+        fieldSetFlags()[3] = other.fieldSetFlags()[3];
+      }
+    }
+
+    /**
+     * Creates a Builder by copying an existing Sensor instance
+     * @param other The existing instance to copy.
+     */
+    private Builder(com.example.Sensor other) {
+      super(SCHEMA$);
+      if (isValidValue(fields()[0], other.id)) {
+        this.id = data().deepCopy(fields()[0].schema(), other.id);
+        fieldSetFlags()[0] = true;
+      }
+      if (isValidValue(fields()[1], other.temperature)) {
+        this.temperature = data().deepCopy(fields()[1].schema(), other.temperature);
+        fieldSetFlags()[1] = true;
+      }
+      if (isValidValue(fields()[2], other.acceleration)) {
+        this.acceleration = data().deepCopy(fields()[2].schema(), other.acceleration);
+        fieldSetFlags()[2] = true;
+      }
+      if (isValidValue(fields()[3], other.velocity)) {
+        this.velocity = data().deepCopy(fields()[3].schema(), other.velocity);
+        fieldSetFlags()[3] = true;
+      }
+    }
+
+    /**
+      * Gets the value of the 'id' field.
+      * @return The value.
+      */
+    public java.lang.CharSequence getId() {
+      return id;
+    }
+
+
+    /**
+      * Sets the value of the 'id' field.
+      * @param value The value of 'id'.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder setId(java.lang.CharSequence value) {
+      validate(fields()[0], value);
+      this.id = value;
+      fieldSetFlags()[0] = true;
+      return this;
+    }
+
+    /**
+      * Checks whether the 'id' field has been set.
+      * @return True if the 'id' field has been set, false otherwise.
+      */
+    public boolean hasId() {
+      return fieldSetFlags()[0];
+    }
+
+
+    /**
+      * Clears the value of the 'id' field.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder clearId() {
+      id = null;
+      fieldSetFlags()[0] = false;
+      return this;
+    }
+
+    /**
+      * Gets the value of the 'temperature' field.
+      * @return The value.
+      */
+    public float getTemperature() {
+      return temperature;
+    }
+
+
+    /**
+      * Sets the value of the 'temperature' field.
+      * @param value The value of 'temperature'.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder setTemperature(float value) {
+      validate(fields()[1], value);
+      this.temperature = value;
+      fieldSetFlags()[1] = true;
+      return this;
+    }
+
+    /**
+      * Checks whether the 'temperature' field has been set.
+      * @return True if the 'temperature' field has been set, false otherwise.
+      */
+    public boolean hasTemperature() {
+      return fieldSetFlags()[1];
+    }
+
+
+    /**
+      * Clears the value of the 'temperature' field.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder clearTemperature() {
+      fieldSetFlags()[1] = false;
+      return this;
+    }
+
+    /**
+      * Gets the value of the 'acceleration' field.
+      * @return The value.
+      */
+    public float getAcceleration() {
+      return acceleration;
+    }
+
+
+    /**
+      * Sets the value of the 'acceleration' field.
+      * @param value The value of 'acceleration'.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder setAcceleration(float value) {
+      validate(fields()[2], value);
+      this.acceleration = value;
+      fieldSetFlags()[2] = true;
+      return this;
+    }
+
+    /**
+      * Checks whether the 'acceleration' field has been set.
+      * @return True if the 'acceleration' field has been set, false otherwise.
+      */
+    public boolean hasAcceleration() {
+      return fieldSetFlags()[2];
+    }
+
+
+    /**
+      * Clears the value of the 'acceleration' field.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder clearAcceleration() {
+      fieldSetFlags()[2] = false;
+      return this;
+    }
+
+    /**
+      * Gets the value of the 'velocity' field.
+      * @return The value.
+      */
+    public float getVelocity() {
+      return velocity;
+    }
+
+
+    /**
+      * Sets the value of the 'velocity' field.
+      * @param value The value of 'velocity'.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder setVelocity(float value) {
+      validate(fields()[3], value);
+      this.velocity = value;
+      fieldSetFlags()[3] = true;
+      return this;
+    }
+
+    /**
+      * Checks whether the 'velocity' field has been set.
+      * @return True if the 'velocity' field has been set, false otherwise.
+      */
+    public boolean hasVelocity() {
+      return fieldSetFlags()[3];
+    }
+
+
+    /**
+      * Clears the value of the 'velocity' field.
+      * @return This builder.
+      */
+    public com.example.Sensor.Builder clearVelocity() {
+      fieldSetFlags()[3] = false;
+      return this;
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public Sensor build() {
+      try {
+        Sensor record = new Sensor();
+        record.id = fieldSetFlags()[0] ? this.id : (java.lang.CharSequence) defaultValue(fields()[0]);
+        record.temperature = fieldSetFlags()[1] ? this.temperature : (java.lang.Float) defaultValue(fields()[1]);
+        record.acceleration = fieldSetFlags()[2] ? this.acceleration : (java.lang.Float) defaultValue(fields()[2]);
+        record.velocity = fieldSetFlags()[3] ? this.velocity : (java.lang.Float) defaultValue(fields()[3]);
+        return record;
+      } catch (org.apache.avro.AvroMissingFieldException e) {
+        throw e;
+      } catch (java.lang.Exception e) {
+        throw new org.apache.avro.AvroRuntimeException(e);
+      }
+    }
+  }
+
+  @SuppressWarnings("unchecked")
+  private static final org.apache.avro.io.DatumWriter<Sensor>
+    WRITER$ = (org.apache.avro.io.DatumWriter<Sensor>)MODEL$.createDatumWriter(SCHEMA$);
+
+  @Override public void writeExternal(java.io.ObjectOutput out)
+    throws java.io.IOException {
+    WRITER$.write(this, SpecificData.getEncoder(out));
+  }
+
+  @SuppressWarnings("unchecked")
+  private static final org.apache.avro.io.DatumReader<Sensor>
+    READER$ = (org.apache.avro.io.DatumReader<Sensor>)MODEL$.createDatumReader(SCHEMA$);
+
+  @Override public void readExternal(java.io.ObjectInput in)
+    throws java.io.IOException {
+    READER$.read(this, SpecificData.getDecoder(in));
+  }
+
+  @Override protected boolean hasCustomCoders() { return true; }
+
+  @Override public void customEncode(org.apache.avro.io.Encoder out)
+    throws java.io.IOException
+  {
+    out.writeString(this.id);
+
+    out.writeFloat(this.temperature);
+
+    out.writeFloat(this.acceleration);
+
+    out.writeFloat(this.velocity);
+
+  }
+
+  @Override public void customDecode(org.apache.avro.io.ResolvingDecoder in)
+    throws java.io.IOException
+  {
+    org.apache.avro.Schema.Field[] fieldOrder = in.readFieldOrderIfDiff();
+    if (fieldOrder == null) {
+      this.id = in.readString(this.id instanceof Utf8 ? (Utf8)this.id : null);
+
+      this.temperature = in.readFloat();
+
+      this.acceleration = in.readFloat();
+
+      this.velocity = in.readFloat();
+
+    } else {
+      for (int i = 0; i < 4; i++) {
+        switch (fieldOrder[i].pos()) {
+        case 0:
+          this.id = in.readString(this.id instanceof Utf8 ? (Utf8)this.id : null);
+          break;
+
+        case 1:
+          this.temperature = in.readFloat();
+          break;
+
+        case 2:
+          this.acceleration = in.readFloat();
+          break;
+
+        case 3:
+          this.velocity = in.readFloat();
+          break;
+
+        default:
+          throw new java.io.IOException("Corrupt ResolvingDecoder.");
+        }
+      }
+    }
+  }
+}
+
+
+
+
+
+
+
+
+
+

schema-registry-samples/spring-schema-registry-kafka-standalone/src/main/resources/application.yml

@@ -0,0 +1,23 @@
+logging:
+  level:
+    org.springframework.cloud: debug
+    com.example: debug
+spring:
+  cloud:
+    schema-registry-client:
+      endpoint: http://localhost:8990
+    schema:
+      avro:
+        prefix: vnd
+        schema-locations: classpath:avro/sensor.avsc
+    stream:
+      function:
+        bindings:
+          consume-in-0: consume1
+      bindings:
+        sensor:
+          destination: sensor-1
+          content-type: application/*+avro
+        consume1:
+          destination: sensor-1
+          content-type: application/*+avro

schema-registry-samples/spring-schema-registry-kafka-standalone/src/main/resources/avro/sensor.avsc

@@ -0,0 +1,11 @@
+{
+  "namespace" : "com.example",
+  "type" : "record",
+  "name" : "Sensor",
+  "fields" : [
+    {"name":"id","type":"string"},
+    {"name":"temperature", "type":"float", "default":0.0},
+    {"name":"acceleration", "type":"float","default":0.0},
+    {"name":"velocity","type":"float","default":0.0}
+  ]
+}