Java: Add test for multi-module projects with different Java versions

Author: IdrissRio

java/ql/integration-tests/java/maven-multimodule-test-java-version/main-module/pom.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.example</groupId>
+    <artifactId>maven-multimodule-test-java-version</artifactId>
+    <version>1.0</version>
+  </parent>
+  <artifactId>main-module</artifactId>
+</project>

java/ql/integration-tests/java/maven-multimodule-test-java-version/main-module/src/main/java/com/example/App.java

@@ -0,0 +1,7 @@
+package com.example;
+
+public class App {
+    public static void main(String[] args) {
+        System.out.println("Hello World!");
+    }
+}

java/ql/integration-tests/java/maven-multimodule-test-java-version/pom.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.example</groupId>
+  <artifactId>maven-multimodule-test-java-version</artifactId>
+  <version>1.0</version>
+  <packaging>pom</packaging>
+
+  <properties>
+    <maven.compiler.release>17</maven.compiler.release>
+  </properties>
+
+  <modules>
+    <module>main-module</module>
+    <module>test-module</module>
+  </modules>
+</project>

java/ql/integration-tests/java/maven-multimodule-test-java-version/source_archive.expected

@@ -0,0 +1,7 @@
+main-module/pom.xml
+main-module/src/main/java/com/example/App.java
+main-module/target/maven-archiver/pom.properties
+pom.xml
+test-module/pom.xml
+test-module/src/main/java/com/example/tests/TestUtils.java
+test-module/target/maven-archiver/pom.properties

java/ql/integration-tests/java/maven-multimodule-test-java-version/test-module/pom.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0">
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>com.example</groupId>
+    <artifactId>maven-multimodule-test-java-version</artifactId>
+    <version>1.0</version>
+  </parent>
+  <artifactId>test-module</artifactId>
+
+  <properties>
+    <maven.compiler.release>21</maven.compiler.release>
+  </properties>
+</project>

java/ql/integration-tests/java/maven-multimodule-test-java-version/test-module/src/main/java/com/example/tests/TestUtils.java

@@ -0,0 +1,12 @@
+package com.example.tests;
+
+// Requires Java 21: switch with pattern matching and guards
+public class TestUtils {
+    public static String analyze(Object obj) {
+        return switch (obj) {
+            case String s when s.length() > 5 -> "long";
+            case String s -> "short";
+            default -> "other";
+        };
+    }
+}

java/ql/integration-tests/java/maven-multimodule-test-java-version/test.py

@@ -0,0 +1,2 @@
+def test(codeql, java):
+    codeql.database.create()