First test of xtext-maven-plugin accessing a Java record

Currently, we force the JDT version 3.37.0, the one supporting Java 21,
as an explicit dependency of the plugin in the IT project

org.eclipse.xtext.maven.plugin/src/test/java/org/eclipse/xtext/maven/plugin/XtextGeneratorIT.java

@@ -23,7 +23,9 @@
 import org.apache.maven.shared.utils.cli.CommandLineUtils;
 import org.apache.maven.shared.utils.io.FileUtils;
 import org.eclipse.xtext.maven.trace.ClassFileDebugSourceExtractor;
+import org.eclipse.xtext.util.JavaRuntimeVersion;
 import org.junit.Assert;
+import org.junit.Assume;
 import org.junit.BeforeClass;
 import org.junit.Test;
 
@@ -234,6 +236,15 @@ public void javaLangBiRef() throws Exception {
 		verifier.verifyFilePresent(verifier.getBasedir() + "/target/xtext-temp/stub-classes/JavaClazz.class");
 	}
 
+	@Test
+	public void javaLang21BiRef() throws Exception {
+		Assume.assumeTrue("Active only on Java 21 and later", JavaRuntimeVersion.isJava21OrLater());
+		Verifier verifier = verifyErrorFreeLog("java-lang-21-bi-ref");
+		verifier.verifyFilePresent(verifier.getBasedir() + "/src-gen/XbaseReferToJava.java");
+		verifier.verifyFilePresent(verifier.getBasedir() + "/target/xtext-temp/stub-classes/XbaseReferToJava.class");
+		verifier.verifyFilePresent(verifier.getBasedir() + "/target/xtext-temp/stub-classes/JavaRecord.class");
+	}
+
 	@Test
 	public void aggregation() throws Exception {
 		Verifier verifier = verifyErrorFreeLog("aggregate");

org.eclipse.xtext.maven.plugin/src/test/resources/it/generate/java-lang-21-bi-ref/pom.xml

@@ -0,0 +1,71 @@
+<?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/maven-v4_0_0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>org.eclipse.xtext</groupId>
+		<artifactId>xtext-maven-plugin-it</artifactId>
+		<version>IT-SNAPSHOT</version>
+	</parent>
+
+	<properties>
+		<maven.compiler.source>21</maven.compiler.source>
+		<maven.compiler.target>21</maven.compiler.target>
+	</properties>
+
+	<artifactId>java-lang-21-bi-ref</artifactId>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.codehaus.mojo</groupId>
+				<artifactId>build-helper-maven-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>add-source</id>
+						<phase>generate-sources</phase>
+						<goals>
+							<goal>add-source</goal>
+						</goals>
+						<configuration>
+							<sources>
+								<source>src-gen</source>
+							</sources>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+			<plugin>
+				<groupId>org.eclipse.xtext</groupId>
+				<artifactId>xtext-maven-plugin</artifactId>
+				<configuration>
+					<languages>
+						<language>
+							<setup>org.eclipse.xtext.purexbase.PureXbaseStandaloneSetup</setup>
+						</language>
+					</languages>
+				</configuration>
+				<dependencies>
+					<dependency>
+						<groupId>org.eclipse.xtext</groupId>
+						<artifactId>org.eclipse.xtext.purexbase</artifactId>
+						<version>${xtext-version}</version>
+					</dependency>
+					<!-- force the version of JDT that supports Java 21 -->
+					<dependency>
+						<groupId>org.eclipse.jdt</groupId>
+						<artifactId>ecj</artifactId>
+						<version>3.37.0</version>
+					</dependency>
+					<dependency>
+						<groupId>org.eclipse.jdt</groupId>
+						<artifactId>org.eclipse.jdt.core</artifactId>
+						<version>3.37.0</version>
+					</dependency>
+				</dependencies>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

org.eclipse.xtext.maven.plugin/src/test/resources/it/generate/java-lang-21-bi-ref/src/JavaRecord.java

@@ -0,0 +1,5 @@
+public record JavaRecord(String name) {
+	public void useXbaseType(XbaseReferToJava xbaseType) throws Throwable {
+		xbaseType.myMethod();
+	}
+}

org.eclipse.xtext.maven.plugin/src/test/resources/it/generate/java-lang-21-bi-ref/src/XbaseReferToJava.xbase

@@ -0,0 +1,3 @@
+val JavaRecord jr = new JavaRecord("test")
+val name = jr.name()
+jr.useXbaseType(this)