Gradle: Multi Compilation 21< and 21

palantir-java-format/build.gradle

@@ -42,17 +42,95 @@ def exports = [
 
 def jvmArgList = exports.collect { value -> "--add-exports=${value}=ALL-UNNAMED".toString() }
 
-tasks.withType(JavaCompile).configureEach {
-    options.errorprone.disable 'StrictUnusedVariable'
+//register compileJava21 on the same source code
+tasks.register("compileJava21", JavaCompile) {
+    javaCompiler = javaToolchains.compilerFor {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
 
-    // Allow access to internal javac apis
-    options.compilerArgs += jvmArgList
+    source(sourceSets["main"].java)
+    classpath = sourceSets["main"].compileClasspath
+    destinationDirectory.set(sourceSets["main"].java.destinationDirectory)
 
-    if (JavaVersion.current() < JavaVersion.VERSION_14) {
-        excludes = ['**/Java14InputAstVisitor.java']
+}
+
+tasks.register("compileTestJava21", JavaCompile) {
+    javaCompiler = javaToolchains.compilerFor {
+        languageVersion = JavaLanguageVersion.of(21)
     }
+
+    source(sourceSets["test-21"].java)
+    classpath = sourceSets["test-21"].compileClasspath
+    destinationDirectory.set(sourceSets["test-21"].java.destinationDirectory)
+
+}
+
+sourceSets {
+    main {
+        java {
+            srcDirs = ['src/main/java']
+        }
+        resources {
+            srcDirs = ['src/main/resources']
+        }
+    }
+    test {
+        java {
+            srcDirs = ['src/test/java']
+        }
+        resources {
+            srcDirs = ['src/test/resources']
+        }
+    }
+
+    'test-21' {
+        java {
+            srcDirs = ['src/test-21/java']
+        }
+        resources {
+            srcDirs = ['src/test-21/resources']
+        }
+    }
+
 }
 
+
+tasks.named("classes") {
+    dependsOn("compileJava21")
+}
+
+tasks.named("testClasses") {
+    dependsOn("compileTestJava21")
+}
+
+tasks.withType(JavaCompile).configureEach {
+    config ->
+        {
+
+            def currentLanguageVersion = config.javaCompiler.get().getMetadata().languageVersion.asInt()
+            println("JavaCompile name:" + config.name + " version:" + currentLanguageVersion)
+
+
+            options.errorprone.disable 'StrictUnusedVariable'
+
+            // Allow access to internal javac apis
+            options.compilerArgs += jvmArgList
+
+            if (currentLanguageVersion < 14) {
+                excludes = ['**/java14/*.java', '**/java21/*.java']
+            }
+            if (14< currentLanguageVersion && currentLanguageVersion < 21) {
+                excludes = ['**/java21/*.java']
+            }
+
+            if (21 <= currentLanguageVersion ) {
+                includes = ['**/java/java21/*.java']
+                excludes = ['**/java/JavaInputAstVisitor.java']
+            }
+        }
+}
+
+
 tasks.withType(Test).configureEach {
     jvmArgs = jvmArgList
 }

palantir-java-format/src/main/java/com/palantir/javaformat/java/java21/Java21InputAstVisitor.java

@@ -0,0 +1,31 @@
+/*
+ * (c) Copyright 2024 Palantir Technologies Inc. All rights reserved.
+ *
+ * Licensed 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.
+ */
+
+package com.palantir.javaformat.java.java21;
+
+public class Java21InputAstVisitor {
+
+    public static void main(String[] args) {
+
+        Thread.startVirtualThread(() -> {
+            try {
+                Thread.sleep(1000);
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        });
+    }
+}