Merge branch 'templates/java-jdk8-pom-compat'

Improve Java Builds with Conditional Compiler Options for JDK-8 Compatibility

Author: kilo52

java/01_executable/source/pom.xml

@@ -10,8 +10,7 @@
   <description>${{VAR_PROJECT_DESCRIPTION}}</description>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.target>${{VAR_JAVA_VERSION_POM}}</maven.compiler.target>
-    <maven.compiler.source>${{VAR_JAVA_VERSION_POM}}</maven.compiler.source>
+${{VAR_POM_PROPERTIES}}
   </properties>
   <organization>
     <name>${{VAR_PROJECT_ORGANISATION_NAME}}</name>
@@ -24,10 +23,15 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
     <directory>build</directory>
     <finalName>${project.artifactId}-${project.version}</finalName>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.12.1</version>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>3.3.0</version>
         <configuration>
           <archive>
             <manifest>
@@ -47,4 +51,5 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
       </plugin>
     </plugins>
   </build>
+${{VAR_POM_PROFILES}}
 </project>

java/02_library/source/pom.xml

@@ -10,8 +10,7 @@
   <description>${{VAR_PROJECT_DESCRIPTION}}</description>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.target>${{VAR_JAVA_VERSION_POM}}</maven.compiler.target>
-    <maven.compiler.source>${{VAR_JAVA_VERSION_POM}}</maven.compiler.source>
+${{VAR_POM_PROPERTIES}}
   </properties>
   <organization>
     <name>${{VAR_PROJECT_ORGANISATION_NAME}}</name>
@@ -24,10 +23,15 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
     <directory>build</directory>
     <finalName>${project.artifactId}-${project.version}</finalName>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.12.1</version>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>3.3.0</version>
         <executions>
           <execution>
             <id>default-jar</id>
@@ -89,4 +93,5 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
       </plugin>
     </plugins>
   </build>
+${{VAR_POM_PROFILES}}
 </project>

java/03_library_native_jni/source/pom.xml

@@ -10,8 +10,7 @@
   <description>${{VAR_PROJECT_DESCRIPTION}}</description>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <maven.compiler.target>${{VAR_JAVA_VERSION_POM}}</maven.compiler.target>
-    <maven.compiler.source>${{VAR_JAVA_VERSION_POM}}</maven.compiler.source>
+${{VAR_POM_PROPERTIES}}
   </properties>
   <organization>
     <name>${{VAR_PROJECT_ORGANISATION_NAME}}</name>
@@ -26,7 +25,7 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
     <plugins>
       <plugin>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.10.1</version>
+        <version>3.12.1</version>
         <configuration>
           <compilerArgs>
             <arg>-h</arg>
@@ -37,7 +36,7 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-jar-plugin</artifactId>
-        <version>2.4</version>
+        <version>3.3.0</version>
         <executions>
           <execution>
             <id>default-jar</id>
@@ -162,4 +161,5 @@ ${{INCLUDE:java/maven/dependencyUnitTests.xml}}
       </plugin>
     </plugins>
   </build>
+${{VAR_POM_PROFILES}}
 </project>

java/init.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# Copyright (C) 2023 Raven Computing
+# Copyright (C) 2024 Raven Computing
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -51,7 +51,6 @@ function process_files_lvl_1() {
   replace_var "PROJECT_ARTIFACT_ID"                "$var_project_artifact_id";
   replace_var "JAVA_VERSION"                       "$var_java_version";
   replace_var "JAVA_VERSION_LABEL"                 "$var_java_version_label";
-  replace_var "JAVA_VERSION_POM"                   "$var_java_version_pom";
   replace_var "NAMESPACE_DECLARATION"              "$var_namespace";
   replace_var "NAMESPACE_DECLARATION_0"            "$var_namespace_0";
   replace_var "NAMESPACE_DECLARATION_TRAILING_SEP" "$var_namespace_trailing_sep";
@@ -60,6 +59,19 @@ function process_files_lvl_1() {
     logW "Docker integration is not yet supported when using JDK 21";
   fi
 
+  # Check for Java 8 compatibility requirement and adjust the POM based on that.
+  if [[ "$var_java_version" == "1.8" ]]; then
+    replace_var "POM_PROPERTIES" "";
+    load_var_from_file "POM_PROFILES";
+    replace_var "POM_PROFILES" "$VAR_FILE_VALUE";
+  else
+    load_var_from_file "POM_PROPERTIES";
+    replace_var "POM_PROPERTIES" "$VAR_FILE_VALUE";
+    replace_var "POM_PROFILES" "";
+  fi
+
+  replace_var "JAVA_VERSION_POM" "$var_java_version_pom";
+
   if [ -z "$var_namespace" ]; then
     replace_var "NAMESPACE_PACKAGE_DECLARATION" "";
   else

java/var/pom_profiles

@@ -0,0 +1,21 @@
+  <profiles>
+    <profile>
+      <id>compiler-jdk8-compat</id>
+      <activation>
+        <jdk>1.8</jdk>
+      </activation>
+      <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+      </properties>
+    </profile>
+    <profile>
+      <id>compiler-java8-release</id>
+      <activation>
+        <jdk>[9,)</jdk>
+      </activation>
+      <properties>
+        <maven.compiler.release>8</maven.compiler.release>
+      </properties>
+    </profile>
+  </profiles>

java/var/pom_properties

@@ -0,0 +1 @@
+    <maven.compiler.release>${{VAR_JAVA_VERSION_POM}}</maven.compiler.release>