[jira] Commented: (HARMONY-5005) [drlvm][kernel][geronimo] Field.getGenericType() fails on a parametrized class from custom classloader

["Vladimir Beliaev (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12538793 ] 

Vladimir Beliaev commented on HARMONY-5005:
-------------------------------------------

I failed to reproduce this issue on yesterday revision:

~/test-5005 $ ../trunk-release/working_vm/build/deploy/jdk/jre/bin/java -showversion Test

        Apache Harmony Launcher : (c) Copyright 1991, 2006 The Apache Software Foundation or its licensors, as applicable.
        java version "1.5.0" 
        pre-alpha : not complete or compatible
        svn = r589818, (Oct 29 2007), Windows/ia32/msvc 1310, release build
        http://harmony.apache.org
        SUCCESS: java.util.List<Foo>

Vasily, please provide more information on what way you reproduced this bug.

Thanks
Vladimir Beliaev

> [drlvm][kernel][geronimo] Field.getGenericType() fails on a parametrized class from custom classloader
> ------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5005
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5005
>             Project: Harmony
>          Issue Type: Bug
>          Components: App-Oriented Bug Reports, DRLVM
>            Reporter: Vasily Zakharov
>            Priority: Critical
>
> java.lang.reflect.Field.getGenericType() fails if the field it's called upon is a parametrized class unavailable through the system class loader. To reproduce use the following code:
> import java.lang.reflect.*;
> import java.net.*;
> public class Test {
>     public static void main(String[] args) {
>         try {
>             ClassLoader loader = new URLClassLoader(new URL[] { new URL("file:foo.jar") } );
>             Class cls = loader.loadClass("Foo");
>             Field field = cls.getDeclaredField("field");
>             Type type = field.getGenericType();
>             System.out.println("SUCCESS: " + type);
>         } catch (Exception e) {
>             e.printStackTrace(System.out);
>         }
>     }
> }
> class Foo {
>     java.util.List<Foo> field;
> }
> After compilation create a foo.jar containing Foo.class and then make sure to remove Foo.class file:
> $ jar cvf foo.jar Foo.class
> $ rm Foo.class
> $ java Test
> Output on RI:
> SUCCESS: java.util.List<Foo>
> Output on Harmony:
> java.lang.TypeNotPresentException: Type Foo not present
> 	at org.apache.harmony.lang.reflect.support.AuxiliaryCreator.createTypeArgs(AuxiliaryCreator.java:216)
> 	at org.apache.harmony.lang.reflect.parser.Parser.parseFieldGenericType(Parser.java:358)
> 	at java.lang.reflect.Field.getGenericType(Field.java:72)
> 	at Test.main(Test.java:9)
> Caused by: java.lang.ClassNotFoundException: Foo
> 	at org.apache.harmony.lang.reflect.support.AuxiliaryLoader.findClass(AuxiliaryLoader.java:119)
> 	at org.apache.harmony.lang.reflect.support.AuxiliaryCreator.createTypeArg(AuxiliaryCreator.java:192)
> 	at org.apache.harmony.lang.reflect.support.AuxiliaryCreator.createTypeArgs(AuxiliaryCreator.java:214)
> 	at org.apache.harmony.lang.reflect.parser.Parser.parseFieldGenericType(Parser.java:358)
> 	... 2 more
> My guess is the problem lies in AuxiliaryLoader.findClass() method, line 67 - the method explicitly uses system class loader to load the target class, which clearly fails if the target class is available through some other classloader. It seems logical to use the classloader of the class whose field is being processed instead. However, the fix seems non-trivial as in the existing architecture the information on the containing class is lost when Parser is called.
> This issue prevents Apache Geronimo 2.0 from starting on Harmony.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.