[jira] [Created] (GROOVY-10164) RootLoader cannot be set as system class loader in Java 12+

["Eric Milles (Jira)" <ji...@apache.org>]

Eric Milles created GROOVY-10164:
------------------------------------

             Summary: RootLoader cannot be set as system class loader in Java 12+
                 Key: GROOVY-10164
                 URL: https://issues.apache.org/jira/browse/GROOVY-10164
             Project: Groovy
          Issue Type: Bug
            Reporter: Eric Milles
            Assignee: Eric Milles


Support for {{-Djava.system.class.loader=org.codehaus.groovy.tools.RootLoader}} is missing for Java 12+.  The constructor that accepts {{ClassLoader}} is private.  See code excerpt below that tries to call this constructor using reflection.

java.lang.ClassLoader
{code:java}
    static synchronized ClassLoader initSystemClassLoader() {
        // ...
        String cn = System.getProperty("java.system.class.loader");
        if (cn != null) {
            try {
                // custom class loader is only supported to be loaded from unnamed module
                Constructor<?> ctor = Class.forName(cn, false, builtinLoader)
                                           .getDeclaredConstructor(ClassLoader.class);
                scl = (ClassLoader) ctor.newInstance(builtinLoader);
{code}


{code}
java.lang.Error: class java.lang.ClassLoader (in module java.base) cannot access a member of class org.codehaus.groovy.tools.RootLoader with modifiers "private"
	at java.lang.ClassLoader.initSystemClassLoader(java.base@12.0.2/ClassLoader.java:1989)
	at java.lang.System.initPhase3(java.base@12.0.2/System.java:2132)
Caused by: java.lang.IllegalAccessException: class java.lang.ClassLoader (in module java.base) cannot access a member of class org.codehaus.groovy.tools.RootLoader with modifiers "private"
	at jdk.internal.reflect.Reflection.newIllegalAccessException(java.base@12.0.2/Reflection.java:376)
	at java.lang.reflect.AccessibleObject.checkAccess(java.base@12.0.2/AccessibleObject.java:639)
	at java.lang.reflect.Constructor.newInstanceWithCaller(java.base@12.0.2/Constructor.java:490)
	at java.lang.reflect.Constructor.newInstance(java.base@12.0.2/Constructor.java:481)
	at java.lang.ClassLoader.initSystemClassLoader(java.base@12.0.2/ClassLoader.java:1977)
	at java.lang.System.initPhase3(java.base@12.0.2/System.java:2132)
{code}



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