[GROOVY-7828] Created a class loader that override loadClass can calls protected methods results in VerifyError

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.4.6
• Fix Version/s: 2.5.0-alpha-1
• Assignee: John Wagenleitner
• Reporter: Graeme Rocher
• Created: 26/Apr/16 09:58
• Updated: 02/May/17 02:03
• Resolved: 25/Sep/16 20:52

Description

The following script results in a VerifyError:

java.lang.VerifyError: (class: FooClassLoader, method: loadClass signature: (Ljava/lang/String;Z)Ljava/lang/Class;) Bad access to protected data
	at java.lang.Class.getDeclaredConstructors0(Native Method)
	at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671)
	at java.lang.Class.getDeclaredConstructors(Class.java:2020)
	at org.codehaus.groovy.reflection.CachedClass$2$1.run(CachedClass.java:77)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.codehaus.groovy.reflection.CachedClass$2.initValue(CachedClass.java:74)
	at org.codehaus.groovy.reflection.CachedClass$2.initValue(CachedClass.java:72)
	at org.codehaus.groovy.util.LazyReference.getLocked(LazyReference.java:49)
	at org.codehaus.groovy.util.LazyReference.get(LazyReference.java:36)
	at org.codehaus.groovy.reflection.CachedClass.getConstructors(CachedClass.java:271)
	at groovy.lang.MetaClassImpl.<init>(MetaClassImpl.java:220)

It should fail with a compilation error since the `loadClass` method is protected.

import groovy.transform.*

@CompileStatic
class FooClassLoader extends URLClassLoader {

        protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
            try {
                return super.loadClass(name, resolve)
            } catch (ClassNotFoundException cnfe) {
                return ClassLoader.systemClassLoader.loadClass(name, resolve)
            }
        }
}

def cl = new FooClassLoader()