Java: Add test for Java 16 target when only Java 17+ is available

Author: IdrissRio

java/ql/integration-tests/java/maven-java16-with-higher-jdk/pom.xml

@@ -0,0 +1,30 @@
+<?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>
+
+  <groupId>com.example</groupId>
+  <artifactId>maven-java16-with-higher-jdk</artifactId>
+  <version>1.0-SNAPSHOT</version>
+
+  <name>maven-java16-with-higher-jdk</name>
+  <description>Test case: Java 16 target when only Java 17+ is available.</description>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <java.version>16</java.version>
+  </properties>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.11.0</version>
+        <configuration>
+          <release>${java.version}</release>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>

java/ql/integration-tests/java/maven-java16-with-higher-jdk/source_archive.expected

@@ -0,0 +1,3 @@
+pom.xml
+src/main/java/com/example/App.java
+target/maven-archiver/pom.properties

java/ql/integration-tests/java/maven-java16-with-higher-jdk/src/main/java/com/example/App.java

@@ -0,0 +1,15 @@
+package com.example;
+
+import java.util.List;
+
+/**
+ * Simple class using Java 16 features (e.g.,records).
+ */
+public class App {
+    public static void main(String[] args) {
+        Person person = new Person("Bob", 42);
+        System.out.println(person);
+    }
+}
+
+record Person(String name, int age) {}

java/ql/integration-tests/java/maven-java16-with-higher-jdk/test.py

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