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From "Vasily Zakharov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5005) [drlvm][kernel][geronimo] Field.getGenericType() fails on a parametrized class from custom classloader
Date Sat, 24 Nov 2007 02:12:43 GMT

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

Vasily Zakharov updated HARMONY-5005:
-------------------------------------

    Patch Info: [Patch Available]

> [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
>            Assignee: Gregory Shimansky
>            Priority: Critical
>         Attachments: 01-H5005-formatting.patch, 02-H5005.patch
>
>
> 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.

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