jdk-24/test/hotspot/jtreg/runtime/modules/CCE_module_msg.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @compile p2/c2.java
 * @compile p4/c4.java
 * @build jdk.test.whitebox.WhiteBox
 * @compile/module=java.base java/lang/ModuleHelper.java
 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI CCE_module_msg
 */

import java.io.*;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.file.Path;
import java.nio.file.Paths;
import static jdk.test.lib.Asserts.*;

import jdk.test.lib.classloader.ClassUnloadCommon;

// Test that the message in a runtime ClassCastException contains module info.
public class CCE_module_msg {
    private static final Path CLASSES_DIR = Paths.get("classes");

    public static void main(String[] args) throws Throwable {
        // Should not display version
        invalidObjectToDerived();
        invalidOriginalInnerToDerived();
        invalidTimeToDerived();
        invalidHeadersToDerived();
        // Should display version
        invalidClassToString();
        // Should display customer class loader
        invalidClassToStringCustomLoader();
    }

    public static void invalidObjectToDerived() {
        java.lang.Object instance = new java.lang.Object();
        int left = 23;
        int right = 42;
        try {
            for (int i = 0; i < 1; i += 1) {
                left = ((Derived) instance).method(left, right);
            }
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            System.out.println(cce.toString());
            if (!cce.getMessage().contains("class java.lang.Object cannot be cast to class Derived (java.lang.Object is in module java.base of loader 'bootstrap'; Derived is in unnamed module of loader 'app')")) {
                throw new RuntimeException("Wrong message: " + cce.getMessage());
            }
        }
    }

    public static void invalidOriginalInnerToDerived() {
        OriginalInner instance = new OriginalInner();
        int left = 23;
        int right = 42;
        try {
            for (int i = 0; i < 1; i += 1) {
                left = ((Derived) (java.lang.Object)instance).method(left, right);
            }
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            System.out.println(cce.toString());
            if (!cce.getMessage().contains("class OriginalInner cannot be cast to class Derived (OriginalInner and Derived are in unnamed module of loader 'app')")) {
                throw new RuntimeException("Wrong message: " + cce.getMessage());
            }
        }
    }

    // Test with a non-upgradeable 'java.' module other than java.base.
    public static void invalidTimeToDerived() {
        java.sql.Time instance = new java.sql.Time(10000);
        int left = 23;
        int right = 42;
        try {
            for (int i = 0; i < 1; i += 1) {
                left = ((Derived) (java.lang.Object)instance).method(left, right);
            }
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            System.out.println(cce.toString());
            if (!cce.getMessage().contains("class java.sql.Time cannot be cast to class Derived (java.sql.Time is in module java.sql of loader 'platform'; Derived is in unnamed module of loader 'app')")) {
                throw new RuntimeException("Wrong message: " + cce.getMessage());
            }
        }
    }

    // Test with a non-upgradeable 'jdk.' module.
    public static void invalidHeadersToDerived() {
        com.sun.net.httpserver.Headers instance = new com.sun.net.httpserver.Headers();
        int left = 23;
        int right = 42;
        try {
            for (int i = 0; i < 1; i += 1) {
                left = ((Derived) (java.lang.Object)instance).method(left, right);
            }
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            System.out.println(cce.toString());
            if (!cce.getMessage().contains("class com.sun.net.httpserver.Headers cannot be cast to class Derived (com.sun.net.httpserver.Headers is in module jdk.httpserver of loader 'platform'; Derived is in unnamed module of loader 'app')")) {
                throw new RuntimeException("Wrong message: " + cce.getMessage());
            }
        }
    }

    public static void invalidClassToString() throws Throwable {
        // Get the java.lang.Module object for module java.base.
        Class jlObject = Class.forName("java.lang.Object");
        Object jlObject_jlM = jlObject.getModule();
        assertNotNull(jlObject_jlM, "jlModule object of java.lang.Object should not be null");

        // Get the class loader for CCE_module_msg and assume it's also used to
        // load classes p1.c1 and p2.c2.
        ClassLoader this_cldr = CCE_module_msg.class.getClassLoader();

        // Define a module for p2.
        Object m2x = ModuleHelper.ModuleObject("module_two", this_cldr, new String[] { "p2" });
        assertNotNull(m2x, "Module should not be null");
        ModuleHelper.DefineModule(m2x, false, "9.0", "m2x/there", new String[] { "p2" });
        ModuleHelper.AddReadsModule(m2x, jlObject_jlM);

        try {
            ModuleHelper.AddModuleExportsToAll(m2x, "p2");
            Object p2Obj = new p2.c2();
            System.out.println((String)p2Obj);
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            String exception = cce.getMessage();
            System.out.println(cce.toString());
            if (!exception.contains("class p2.c2 cannot be cast to class java.lang.String (p2.c2 is in module module_two@") ||
                !exception.contains(" of loader 'app'; java.lang.String is in module java.base of loader 'bootstrap')")) {
                throw new RuntimeException("Wrong message: " + exception);
            }
        }
    }

    public static void invalidClassToStringCustomLoader() throws Throwable {
        // Get the java.lang.Module object for module java.base.
        Class jlObject = Class.forName("java.lang.Object");
        Object jlObject_jlM = jlObject.getModule();
        assertNotNull(jlObject_jlM, "jlModule object of java.lang.Object should not be null");

        // Create a customer class loader to load class p4/c4.
        URL[] urls = new URL[] { CLASSES_DIR.toUri().toURL() };
        ClassLoader parent = ClassLoader.getSystemClassLoader();
        MyURLClassLoader myCldr = new MyURLClassLoader("MyClassLoader", urls, parent);

        try {
            // Class p4.c4 should be defined to the unnamed module of myCldr
            Class p4_c4_class = myCldr.loadClass("p4.c4");
            Object c4Obj = p4_c4_class.newInstance();
            System.out.println((String)c4Obj);
            throw new RuntimeException("ClassCastException wasn't thrown, test failed.");
        } catch (ClassCastException cce) {
            String exception = cce.getMessage();
            System.out.println(cce.toString());
            if (!exception.contains("class p4.c4 cannot be cast to class java.lang.String (p4.c4 is in unnamed module of loader 'MyClassLoader' @") ||
                !exception.contains("; java.lang.String is in module java.base of loader 'bootstrap')")) {
                throw new RuntimeException("Wrong message: " + exception);
            }
        }
    }
}

class OriginalInner extends java.lang.Object {
    public int method(int left, int right) {
        return right;
    }
}

class Derived extends java.lang.Object {
    public int method(int left, int right) {
        return right;
    }
}

class MyURLClassLoader extends URLClassLoader {
    public MyURLClassLoader(String name,
                          URL[] urls,
                          ClassLoader parent) {
        super(name, urls, parent);
    }

    public Class loadClass(String name) throws ClassNotFoundException {
        if (!name.equals("p4.c4")) {
            return super.loadClass(name);
        }
        byte[] data = ClassUnloadCommon.getClassData(name);
        return defineClass(name, data, 0, data.length);
    }
}