(logging-log4j-samples) 01/01: Use Java 8 as Target for Gradle Example

[pkarwasz]

This is an automated email from the ASF dual-hosted git repository.

pkarwasz pushed a commit to branch feat/gradle-compile-only-java-8
in repository https://gitbox.apache.org/repos/asf/logging-log4j-samples.git

commit c20baf824b909f07bb68e7e351fa9ed3aa573039
Author: Piotr P. Karwasz <pkarwasz-git...@apache.org>
AuthorDate: Sat Jun 21 16:55:30 2025 +0200

    Use Java 8 as Target for Gradle Example
    
    As discussed in gradle/gradle#33964 and apache/logging-log4j2#3754, Gradle 
fails the build if a `compileOnly` dependency is not compatible with the Java 
version specified via `options.release`, even though such dependencies don’t 
impact runtime behavior.
    
    This PR updates the Gradle example to explicitly target **Java 8**, 
allowing us to surface and detect such compatibility issues through our 
regression tests. This helps ensure our published artifacts remain usable in 
Gradle builds targeting Java 8, and catches potential issues earlier in our 
release cycle.
---
 log4j-samples-gradle-metadata/build.gradle            |  8 ++++++--
 .../src/main/java/module-info.java                    | 19 -------------------
 .../src/main/java/org/example/App.java                |  2 +-
 3 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/log4j-samples-gradle-metadata/build.gradle 
b/log4j-samples-gradle-metadata/build.gradle
index b4b40eb..a8be180 100644
--- a/log4j-samples-gradle-metadata/build.gradle
+++ b/log4j-samples-gradle-metadata/build.gradle
@@ -30,6 +30,10 @@ dependencies {
 }
 
 tasks.withType(JavaCompile).configureEach {
+    // Test compatibility of `compileOnly` dependencies with Java 8
+    //
+    // See: https://github.com/gradle/gradle/issues/33964
+    options.release = 8
     options.compilerArgs.add("-Werror") // treat all warnings as errors
     options.compilerArgs.add("-Xlint:all") // includes 'classfile' check
 }
@@ -55,14 +59,14 @@ tasks.register("assertRuntimeClasspath") {
     inputs.files(configurations.runtimeClasspath)
     doLast {
         def actual = inputs.files.collect { it.name.replaceAll("-[0-9].*", "") 
}
-        assert actual.sort() == expectedRuntimeClasspath : "Unexpected runtime 
classpath: $actual"
+        assert actual.sort() == expectedRuntimeClasspath : "Unexpected runtime 
classpath:\nActual: $actual\nExpected: $expectedRuntimeClasspath"
     }
 }
 tasks.register("assertCompileClasspath") {
     inputs.files(configurations.compileClasspath)
     doLast {
         def actual = inputs.files.collect { it.name.replaceAll("-[0-9].*", "") 
}
-        assert actual.sort() == expectedCompileClasspath : "Unexpected compile 
classpath: $actual"
+        assert actual.sort() == expectedCompileClasspath : "Unexpected compile 
classpath:\nActual: $actual\nExpected: $expectedCompileClasspath"
     }
 }
 
diff --git a/log4j-samples-gradle-metadata/src/main/java/module-info.java 
b/log4j-samples-gradle-metadata/src/main/java/module-info.java
deleted file mode 100644
index b5c6c9c..0000000
--- a/log4j-samples-gradle-metadata/src/main/java/module-info.java
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * 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
- *
- *      http://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.
- */
-module org.example.log4j.metadata {
-    requires org.apache.logging.log4j;
-}
\ No newline at end of file
diff --git a/log4j-samples-gradle-metadata/src/main/java/org/example/App.java 
b/log4j-samples-gradle-metadata/src/main/java/org/example/App.java
index ef45021..5a783a7 100644
--- a/log4j-samples-gradle-metadata/src/main/java/org/example/App.java
+++ b/log4j-samples-gradle-metadata/src/main/java/org/example/App.java
@@ -24,6 +24,6 @@ public class App {
     org.apache.logging.log4j.spi.LoggerRegistry<?> r; // needs jspecify
 
     public static void main(String[] args) {
-        System.out.println("Hello from: " + App.class.getModule().getName());
+        System.out.println("Hello from: " + App.class.getName());
     }
 }