diff --git a/servlet/spring-boot/java/acl/build.gradle b/servlet/spring-boot/java/acl/build.gradle
new file mode 100644
index 0000000..51feacc
--- /dev/null
+++ b/servlet/spring-boot/java/acl/build.gradle
@@ -0,0 +1,36 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.4.4'
+	id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'example'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(17)
+	}
+}
+
+repositories {
+	maven { url "https://repo.spring.io/snapshot" }
+	maven { url "https://repo.spring.io/milestone" }
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	implementation 'org.springframework.boot:spring-boot-starter-security'
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.security:spring-security-acl'
+	implementation 'org.hsqldb:hsqldb'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testImplementation 'org.springframework.security:spring-security-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/servlet/spring-boot/java/acl/gradle.properties b/servlet/spring-boot/java/acl/gradle.properties
new file mode 100644
index 0000000..7ff7f29
--- /dev/null
+++ b/servlet/spring-boot/java/acl/gradle.properties
@@ -0,0 +1,4 @@
+version=6.1.1
+spring-security.version=6.5.0-SNAPSHOT
+org.gradle.jvmargs=-Xmx6g -XX:+HeapDumpOnOutOfMemoryError
+org.gradle.caching=true
diff --git a/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.jar b/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..9bbc975
Binary files /dev/null and b/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.properties b/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..37f853b
--- /dev/null
+++ b/servlet/spring-boot/java/acl/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/servlet/spring-boot/java/acl/gradlew b/servlet/spring-boot/java/acl/gradlew
new file mode 100755
index 0000000..faf9300
--- /dev/null
+++ b/servlet/spring-boot/java/acl/gradlew
@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original 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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+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
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/servlet/spring-boot/java/acl/gradlew.bat b/servlet/spring-boot/java/acl/gradlew.bat
new file mode 100644
index 0000000..9b42019
--- /dev/null
+++ b/servlet/spring-boot/java/acl/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem 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, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/servlet/spring-boot/java/acl/settings.gradle b/servlet/spring-boot/java/acl/settings.gradle
new file mode 100644
index 0000000..733fda6
--- /dev/null
+++ b/servlet/spring-boot/java/acl/settings.gradle
@@ -0,0 +1,8 @@
+pluginManagement {
+    repositories {
+        mavenCentral()
+        gradlePluginPortal()
+        maven { url 'https://repo.spring.io/milestone' }
+        maven { url "https://repo.spring.io/snapshot" }
+    }
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/AclApplication.java b/servlet/spring-boot/java/acl/src/main/java/example/AclApplication.java
new file mode 100644
index 0000000..22d4f18
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/AclApplication.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class AclApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(AclApplication.class, args);
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/AclInitializer.java b/servlet/spring-boot/java/acl/src/main/java/example/AclInitializer.java
new file mode 100644
index 0000000..3b692d9
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/AclInitializer.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import org.springframework.beans.factory.SmartInitializingSingleton;
+import org.springframework.security.acls.domain.BasePermission;
+import org.springframework.security.acls.domain.ObjectIdentityImpl;
+import org.springframework.security.acls.domain.PrincipalSid;
+import org.springframework.security.acls.jdbc.JdbcMutableAclService;
+import org.springframework.security.acls.model.MutableAcl;
+import org.springframework.security.acls.model.ObjectIdentity;
+import org.springframework.security.authentication.TestingAuthenticationToken;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.support.TransactionTemplate;
+
+@Component
+class AclInitializer implements SmartInitializingSingleton {
+
+	private final JdbcMutableAclService acls;
+
+	private final MessageRepository messages;
+
+	private final TransactionTemplate transactions;
+
+	AclInitializer(JdbcMutableAclService acls, MessageRepository messages, TransactionTemplate transactions) {
+		this.acls = acls;
+		this.messages = messages;
+		this.transactions = transactions;
+	}
+
+	@Override
+	public void afterSingletonsInstantiated() {
+		Iterable<Message> messages = this.messages.findAll();
+		for (Message message : messages) {
+			String to = message.getTo();
+			ObjectIdentity id = new ObjectIdentityImpl(Message.class, message.getId());
+			asUser(to, () -> this.transactions.execute((status) -> {
+				MutableAcl acl = AclInitializer.this.acls.createAcl(id);
+				acl.insertAce(0, BasePermission.READ, new PrincipalSid(to), true);
+				return this.acls.updateAcl(acl);
+			}));
+		}
+	}
+
+	private void asUser(String user, Runnable runnable) {
+		SecurityContextHolder.getContext().setAuthentication(new TestingAuthenticationToken(user, null, "app"));
+		runnable.run();
+		SecurityContextHolder.clearContext();
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/DataSourceConfiguration.java b/servlet/spring-boot/java/acl/src/main/java/example/DataSourceConfiguration.java
new file mode 100644
index 0000000..00086a1
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/DataSourceConfiguration.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import javax.sql.DataSource;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+
+/**
+ * Spring Data Configuration.
+ *
+ * @author Rob Winch
+ */
+@Configuration
+class DataSourceConfiguration {
+
+	@Bean
+	DataSource dataSource() {
+		EmbeddedDatabaseBuilder builder = new EmbeddedDatabaseBuilder();
+		return builder.setType(EmbeddedDatabaseType.HSQL).addScript("classpath:createAclSchema.sql").build();
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/Message.java b/servlet/spring-boot/java/acl/src/main/java/example/Message.java
new file mode 100644
index 0000000..357b07c
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/Message.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import java.time.Instant;
+
+import jakarta.persistence.Column;
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+
+@Entity
+public class Message {
+
+	@Id
+	@GeneratedValue(strategy = GenerationType.AUTO)
+	private Long id;
+
+	private String text;
+
+	private String summary;
+
+	private Instant created = Instant.now();
+
+	@Column(name = "recipient")
+	private String to;
+
+	public String getTo() {
+		return this.to;
+	}
+
+	public void setTo(String to) {
+		this.to = to;
+	}
+
+	public Long getId() {
+		return this.id;
+	}
+
+	public void setId(Long id) {
+		this.id = id;
+	}
+
+	public Instant getCreated() {
+		return this.created;
+	}
+
+	public void setCreated(Instant created) {
+		this.created = created;
+	}
+
+	public String getText() {
+		return this.text;
+	}
+
+	public void setText(String text) {
+		this.text = text;
+	}
+
+	public String getSummary() {
+		return this.summary;
+	}
+
+	public void setSummary(String summary) {
+		this.summary = summary;
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/MessageController.java b/servlet/spring-boot/java/acl/src/main/java/example/MessageController.java
new file mode 100644
index 0000000..e4c9e9f
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/MessageController.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.access.prepost.PostAuthorize;
+import org.springframework.security.access.prepost.PostFilter;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+class MessageController {
+
+	private final MessageRepository messages;
+
+	MessageController(MessageRepository messages) {
+		this.messages = messages;
+	}
+
+	@GetMapping
+	@PostFilter("hasPermission(filterObject, read)")
+	Iterable<Message> getMessages() {
+		return this.messages.findAll();
+	}
+
+	@GetMapping("/{id}")
+	@PostAuthorize("hasPermission(returnObject, read)")
+	ResponseEntity<Message> getMessages(Long id) {
+		return this.messages.findById(id).map(ResponseEntity::ok).orElse(ResponseEntity.notFound().build());
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/MessageRepository.java b/servlet/spring-boot/java/acl/src/main/java/example/MessageRepository.java
new file mode 100644
index 0000000..0246534
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/MessageRepository.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+/**
+ * A repository for accessing {@link Message}s.
+ *
+ * @author Rob Winch
+ */
+@Repository
+interface MessageRepository extends CrudRepository<Message, Long> {
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/java/example/SecurityConfig.java b/servlet/spring-boot/java/acl/src/main/java/example/SecurityConfig.java
new file mode 100644
index 0000000..1a94aa9
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/java/example/SecurityConfig.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import javax.sql.DataSource;
+
+import org.springframework.cache.Cache;
+import org.springframework.cache.concurrent.ConcurrentMapCache;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.access.expression.method.DefaultMethodSecurityExpressionHandler;
+import org.springframework.security.access.expression.method.MethodSecurityExpressionHandler;
+import org.springframework.security.acls.AclPermissionEvaluator;
+import org.springframework.security.acls.domain.AclAuthorizationStrategy;
+import org.springframework.security.acls.domain.AclAuthorizationStrategyImpl;
+import org.springframework.security.acls.domain.ConsoleAuditLogger;
+import org.springframework.security.acls.domain.DefaultPermissionGrantingStrategy;
+import org.springframework.security.acls.domain.SpringCacheBasedAclCache;
+import org.springframework.security.acls.jdbc.BasicLookupStrategy;
+import org.springframework.security.acls.jdbc.JdbcMutableAclService;
+import org.springframework.security.acls.jdbc.LookupStrategy;
+import org.springframework.security.acls.model.AclCache;
+import org.springframework.security.acls.model.AclService;
+import org.springframework.security.acls.model.PermissionGrantingStrategy;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+import org.springframework.security.core.authority.SimpleGrantedAuthority;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.provisioning.InMemoryUserDetailsManager;
+
+@EnableMethodSecurity
+@Configuration
+class SecurityConfig {
+
+	@Bean
+	static MethodSecurityExpressionHandler expressionHandler(AclPermissionEvaluator aclPermissionEvaluator) {
+		final DefaultMethodSecurityExpressionHandler expressionHandler = new DefaultMethodSecurityExpressionHandler();
+		expressionHandler.setPermissionEvaluator(aclPermissionEvaluator);
+		return expressionHandler;
+	}
+
+	@Bean
+	static AclPermissionEvaluator aclPermissionEvaluator(AclService aclService) {
+		return new AclPermissionEvaluator(aclService);
+	}
+
+	@Bean
+	static JdbcMutableAclService aclService(DataSource dataSource, LookupStrategy lookupStrategy, AclCache aclCache) {
+		return new JdbcMutableAclService(dataSource, lookupStrategy, aclCache);
+	}
+
+	@Bean
+	static LookupStrategy lookupStrategy(DataSource dataSource, AclCache cache,
+			AclAuthorizationStrategy aclAuthorizationStrategy, PermissionGrantingStrategy permissionGrantingStrategy) {
+		return new BasicLookupStrategy(dataSource, cache, aclAuthorizationStrategy, permissionGrantingStrategy);
+	}
+
+	@Bean
+	static AclCache aclCache(PermissionGrantingStrategy permissionGrantingStrategy,
+			AclAuthorizationStrategy aclAuthorizationStrategy) {
+		Cache cache = new ConcurrentMapCache("aclCache");
+		return new SpringCacheBasedAclCache(cache, permissionGrantingStrategy, aclAuthorizationStrategy);
+	}
+
+	@Bean
+	static AclAuthorizationStrategy aclAuthorizationStrategy() {
+		return new AclAuthorizationStrategyImpl(new SimpleGrantedAuthority("ADMIN"));
+	}
+
+	@Bean
+	static PermissionGrantingStrategy permissionGrantingStrategy() {
+		return new DefaultPermissionGrantingStrategy(new ConsoleAuditLogger());
+	}
+
+	@Bean
+	UserDetailsService userDetailsService() {
+		return new InMemoryUserDetailsManager(
+				User.builder().username("rob").password("{noop}password").authorities("app").build(),
+				User.builder().username("luke").password("{noop}password").authorities("app").build());
+	}
+
+}
diff --git a/servlet/spring-boot/java/acl/src/main/resources/application.properties b/servlet/spring-boot/java/acl/src/main/resources/application.properties
new file mode 100644
index 0000000..d372b5d
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/resources/application.properties
@@ -0,0 +1,3 @@
+spring.application.name=acl
+
+spring.jpa.defer-datasource-initialization=true
\ No newline at end of file
diff --git a/servlet/spring-boot/java/acl/src/main/resources/data.sql b/servlet/spring-boot/java/acl/src/main/resources/data.sql
new file mode 100644
index 0000000..cfb8285
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/resources/data.sql
@@ -0,0 +1,7 @@
+insert into message (id,created,recipient,summary,text) values (100,'2014-07-10 10:00:00','rob','Hello Rob','This message is for Rob');
+insert into message (id,created,recipient,summary,text) values (101,'2014-07-10 14:00:00','rob','How are you Rob?','This message is for Rob');
+insert into message (id,created,recipient,summary,text) values (102,'2014-07-11 22:00:00','rob','Is this secure?','This message is for Rob');
+
+insert into message (id,created,recipient,summary,text) values (110,'2014-07-12 10:00:00','luke','Hello Luke','This message is for Luke');
+insert into message (id,created,recipient,summary,text) values (111,'2014-07-12 10:00:00','luke','Greetings Luke','This message is for Luke');
+insert into message (id,created,recipient,summary,text) values (112,'2014-07-12 10:00:00','luke','Is this secure?','This message is for Luke');
\ No newline at end of file
diff --git a/servlet/spring-boot/java/acl/src/main/resources/schema.sql b/servlet/spring-boot/java/acl/src/main/resources/schema.sql
new file mode 100644
index 0000000..c57e64b
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/main/resources/schema.sql
@@ -0,0 +1,7 @@
+CREATE TABLE IF NOT EXISTS message (
+  id BIGINT IDENTITY PRIMARY KEY,
+  text VARCHAR(255),
+  summary VARCHAR(255),
+  created TIMESTAMP,
+  recipient VARCHAR(255)
+);
\ No newline at end of file
diff --git a/servlet/spring-boot/java/acl/src/test/java/example/AclApplicationTests.java b/servlet/spring-boot/java/acl/src/test/java/example/AclApplicationTests.java
new file mode 100644
index 0000000..a8e585e
--- /dev/null
+++ b/servlet/spring-boot/java/acl/src/test/java/example/AclApplicationTests.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2002-2025 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.
+ */
+
+package example;
+
+import java.util.stream.StreamSupport;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.security.test.context.support.WithMockUser;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class AclApplicationTests {
+
+	@Autowired
+	MessageRepository repository;
+
+	@Test
+	@WithMockUser("rob")
+	void findAllOnlyToCurrentUserCantReadMessage() {
+		long count = StreamSupport.stream(this.repository.findAll().spliterator(), false)
+			.filter((message) -> message.getTo().equals("rob"))
+			.count();
+		assertThat(count).isEqualTo(3);
+	}
+
+	@Test
+	@WithMockUser("luke")
+	void findAllOnlyToCurrentUserCanReadMessage() {
+		long count = StreamSupport.stream(this.repository.findAll().spliterator(), false)
+			.filter((message) -> message.getTo().equals("luke"))
+			.count();
+		assertThat(count).isEqualTo(3);
+
+	}
+
+}
diff --git a/settings.gradle b/settings.gradle
index ae52855..71191ba 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -48,6 +48,7 @@ include ":servlet:java-configuration:hello-security"
 include ":servlet:java-configuration:hello-security-explicit"
 include ":servlet:java-configuration:max-sessions"
 include ":servlet:java-configuration:saml2:login"
+include ":servlet:spring-boot:java:acl"
 include ":servlet:spring-boot:java:aot:data"
 include ":servlet:spring-boot:java:authentication:username-password:user-details-service:custom-user"
 include ":servlet:spring-boot:java:authentication:username-password:mfa"