Migrate project to Gradle

* Upgrade all the dependencies to the latest versions
* Fix some incompatibilities
* Fix some warnings

function/object-detection-function/build.gradle

@@ -0,0 +1,18 @@
+plugins {
+    id 'com.google.protobuf' version '0.9.4'
+}
+
+ext {
+    protobufVersion='3.25.1'
+}
+
+dependencies {
+    api project(':tensorflow-common')
+    api "com.google.protobuf:protobuf-java:$protobufVersion"
+}
+
+protobuf {
+    protoc {
+        artifact = "com.google.protobuf:protoc:$protobufVersion"
+    }
+}

function/object-detection-function/pom.xml

@@ -1,74 +0,0 @@
-<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-
-	<parent>
-		<groupId>org.springframework.cloud.fn</groupId>
-		<artifactId>spring-functions-parent</artifactId>
-		<version>4.0.1-SNAPSHOT</version>
-		<relativePath>../../spring-functions-parent/pom.xml</relativePath>
-	</parent>
-
-	<artifactId>object-detection-function</artifactId>
-	<name>object-detection-function</name>
-	<description>Spring Native Function for Tensorflow Integration</description>
-	<properties>
-		<protobuf.version>3.19.6</protobuf.version>
-	</properties>
-	<dependencies>
-		<dependency>
-			<groupId>com.google.protobuf</groupId>
-			<artifactId>protobuf-java</artifactId>
-			<version>${protobuf.version}</version>
-		</dependency>
-		<dependency>
-			<groupId>org.springframework.cloud.fn</groupId>
-			<artifactId>tensorflow-common</artifactId>
-			<version>${project.version}</version>
-		</dependency>
-	</dependencies>
-
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>com.github.os72</groupId>
-				<artifactId>protoc-jar-maven-plugin</artifactId>
-				<!-- NOTE upgrading with versions above 3.8.0 generates incompatible for protobuf-java:3.5.1 coming with TF 1.15.0 -->
-				<version>3.11.4</version>
-				<executions>
-					<execution>
-						<phase>generate-sources</phase>
-						<goals>
-							<goal>run</goal>
-						</goals>
-						<configuration>
-							<!-- <includeDirectories> <include>src/main/protobuf</include> </includeDirectories> -->
-							<inputDirectories>
-								<include>src/main/proto</include>
-							</inputDirectories>
-							<!-- Create java files. And put them in the src/main/java directory. -->
-							<outputTargets>
-								<outputTarget>
-									<type>java</type>
-									<outputDirectory>src/main/java</outputDirectory>
-								</outputTarget>
-							</outputTargets>
-							<protocArtifact>com.google.protobuf:protoc:${protobuf.version}</protocArtifact>
-						</configuration>
-					</execution>
-				</executions>
-			</plugin>
-		</plugins>
-	</build>
-
-	<!--	<repositories>-->
-	<!--		<repository>-->
-	<!--			<id>tensorflow-snapshots</id>-->
-	<!--			<url>https://oss.sonatype.org/content/repositories/snapshots/</url>-->
-	<!--			<snapshots>-->
-	<!--				<enabled>true</enabled>-->
-	<!--			</snapshots>-->
-	<!--		</repository>-->
-	<!--	</repositories>-->
-</project>

function/object-detection-function/src/main/java/org/springframework/cloud/fn/object/detection/ObjectDetectionInputAdapter.java

@@ -62,7 +62,7 @@ public class ObjectDetectionInputAdapter implements Function<byte[], Map<String,
 
 	@Override
 	public Map<String, Tensor<?>> apply(byte[] inputImage) {
-		try (Tensor inputTensor = Tensor.create(inputImage)) {
+		try (Tensor<?> inputTensor = Tensor.<Object>create(inputImage)) {
 			return this.imageLoaderGraph.apply(Collections.singletonMap(RAW_IMAGE, inputTensor));
 		}
 	}

function/object-detection-function/src/main/java/org/springframework/cloud/fn/object/detection/ObjectDetectionOutputConverter.java

@@ -108,7 +108,7 @@ public class ObjectDetectionOutputConverter implements Function<Map<String, Tens
 
 			String[] labelIdToNameMap = new String[maxLabelId + 1];
 			for (StringIntLabelMapOuterClass.StringIntLabelMapItem item : proto.getItemList()) {
-				if (!StringUtils.isEmpty(item.getDisplayName())) {
+				if (StringUtils.hasText(item.getDisplayName())) {
 					labelIdToNameMap[item.getId()] = item.getDisplayName();
 				}
 				else {