Add Java 15 / AspectJ 1.9.7 test suite

Also fix some minor details in Java 14 suite

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

1 files changed, 39 insertions, 0 deletions

diff --git a/tests/features197/java15/HiddenClassDemo.java b/tests/features197/java15/HiddenClassDemo.java
new file mode 100644
index 000000000..0b7f0ab17
--- /dev/null
+++ b/tests/features197/java15/HiddenClassDemo.java
@@ -0,0 +1,39 @@
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Constructor;
+
+import java.io.FileInputStream;
+
+import static java.lang.invoke.MethodHandles.Lookup.ClassOption.NESTMATE;
+
+public class HiddenClassDemo {
+  public static void main(String[] args) throws Throwable {
+    // Step 1: Create lookup object
+    MethodHandles.Lookup lookup = MethodHandles.lookup();
+
+    // Step 2: Fetch or create the class bytes we want to define
+    byte[] bytes = Thread.currentThread().getContextClassLoader()
+      .getResourceAsStream("HiddenClass.class")
+      .readAllBytes();
+
+    // Step 3: Define hidden class
+    Class<?> clazz = lookup.defineHiddenClass(bytes, true, NESTMATE).lookupClass();
+    // Hidden classes have class names like my.package.MyClass/0x2a23f5, but no canonical name (null)
+    System.out.println("Hidden class name = " + clazz.getName());
+    System.out.println("Hidden class canonical name = " + clazz.getCanonicalName ());
+    // Hidden classes cannot be resolved by any class loader (ClassNotFoundException)
+    try {
+      Class.forName(clazz.getName());
+    }
+    catch (ClassNotFoundException e) {
+      System.out.println("Class.forName resolution error = " + e);
+    }
+
+    //Step 4: Create instance of hidden class object and call interface method
+    Test test = (Test) clazz.getConstructor(null).newInstance(null);
+    test.concat("Hello", "from", "dynamically", "defined", "hidden", "class");
+  }
+}
+
+interface Test {
+  void concat(String... words);
+}