8335896: Source launcher should set TCCL

Reviewed-by: alanb

Author: sormuras

src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/MemoryContext.java

@@ -184,10 +184,9 @@ byte[] compileJavaFileByName(String name) {
      * @param parent the class loader to be used as the parent loader
      * @param mainClassName the fully-qualified name of the application class to load
      * @return class loader object able to find and load the desired class
-     * @throws ClassNotFoundException if the class cannot be located
      * @throws Fault if a modular application class is in the unnamed package
      */
-    ClassLoader newClassLoaderFor(ClassLoader parent, String mainClassName) throws ClassNotFoundException, Fault {
+    ClassLoader newClassLoaderFor(ClassLoader parent, String mainClassName) throws Fault {
         var moduleInfoBytes = inMemoryClasses.get("module-info");
         if (moduleInfoBytes == null) {
             // Trivial case: no compiled module descriptor available, no extra module layer required

src/jdk.compiler/share/classes/com/sun/tools/javac/launcher/SourceLauncher.java

@@ -198,8 +198,9 @@ private Class<?> execute(MemoryContext context, String[] mainArgs)
         // 1. Find a main method in the first class and if there is one - invoke it
         Class<?> firstClass;
         String firstClassName = program.qualifiedTypeNames().getFirst();
+        ClassLoader loader = context.newClassLoaderFor(parentLoader, firstClassName);
+        Thread.currentThread().setContextClassLoader(loader);
         try {
-            ClassLoader loader = context.newClassLoaderFor(parentLoader, firstClassName);
             firstClass = Class.forName(firstClassName, false, loader);
         } catch (ClassNotFoundException e) {
             throw new Fault(Errors.CantFindClass(firstClassName));

test/langtools/tools/javac/launcher/SourceLauncherTest.java

@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug 8192920 8204588 8246774 8248843 8268869 8235876 8328339
+ * @bug 8192920 8204588 8246774 8248843 8268869 8235876 8328339 8335896
  * @summary Test source launcher
  * @library /tools/lib
  * @enablePreview
@@ -276,6 +276,27 @@ public void testSystemProperty(Path base) throws IOException {
         checkEqual("stdout", log.trim(), file.toAbsolutePath().toString());
     }
 
+    @Test
+    public void testThreadContextClassLoader(Path base) throws IOException {
+        tb.writeJavaFiles(base, //language=java
+                """
+                class ThreadContextClassLoader {
+                    public static void main(String... args) {
+                        var expected = ThreadContextClassLoader.class.getClassLoader();
+                        var actual = Thread.currentThread().getContextClassLoader();
+                        System.out.println(expected == actual);
+                    }
+                }
+                """);
+
+        Path file = base.resolve("ThreadContextClassLoader.java");
+        String log = new JavaTask(tb)
+                .className(file.toString())
+                .run(Task.Expect.SUCCESS)
+                .getOutput(Task.OutputKind.STDOUT);
+        checkEqual("stdout", log.trim(), "true");
+    }
+
     void testSuccess(Path file, String expect) throws IOException {
         Result r = run(file, Collections.emptyList(), List.of("1", "2", "3"));
         checkEqual("stdout", r.stdOut, expect);