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Posted to issues@commons.apache.org by "Dragisa Krsmanovic (JIRA)" <ji...@apache.org> on 2010/05/07 01:59:48 UTC
[jira] Commented: (BEANUTILS-340) Property with getter from generic
interface returns wrong readMethod/propertyType on Linux environment
[ https://issues.apache.org/jira/browse/BEANUTILS-340?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12864966#action_12864966 ]
Dragisa Krsmanovic commented on BEANUTILS-340:
----------------------------------------------
This is a JDK bug. Present both in 1.5 and 1.6.
See:
http://bugs.sun.com/view_bug.do?bug_id=6422403
http://bugs.sun.com/view_bug.do?bug_id=6528714
Java introspection will return two get methods with different return types. The order in which it returns them will be completely random.
See example on http://www.dragishak.com/?p=108
> Property with getter from generic interface returns wrong readMethod/propertyType on Linux environment
> ------------------------------------------------------------------------------------------------------
>
> Key: BEANUTILS-340
> URL: https://issues.apache.org/jira/browse/BEANUTILS-340
> Project: Commons BeanUtils
> Issue Type: Bug
> Components: Bean / Property Utils
> Affects Versions: 1.8.0-BETA
> Environment: ==Works correctly in==
> Windows XP
> java version "1.5.0_12"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04)
> Java HotSpot(TM) Client VM (build 1.5.0_12-b04, mixed mode)
> ==Fails in==
> Linux 2.6.27-gentoo-r8 #6 SMP Thu Feb 5 19:18:16 MST 2009 i686 06/17 GenuineIntel GNU/Linux
> java version "1.5.0_17"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_17-b04)
> Java HotSpot(TM) Server VM (build 1.5.0_17-b04, mixed mode)
> Reporter: Dave Lindquist
> Priority: Minor
> Fix For: LATER THAN 1.8.4
>
>
> PropertyUtils.getPropertyDescriptors is returning the wrong readMethod (and thus the wrong property type) when a method is implemented from a genericized interface, but only on some environments. This seems to work on Windows, but fails on Linux. (Compile environment does not matter, runtime environment does seem to matter.)
> Take the following test class:
> {code}
> public class Testing
> {
> public static void main(String[] args) throws Exception
> {
> for(PropertyDescriptor desc : PropertyUtils.getPropertyDescriptors(Test2.class))
> {
> if(desc.getName().equals("something"))
> {
> System.out.println(desc.getName() + "\t" + desc.getPropertyType() + "\t" + desc.getReadMethod() + "\t" + desc.getReadMethod().isSynthetic() + "\t" + desc.getReadMethod().isBridge());
> }
> }
> }
>
> // An interface with generics, and with getter and setter defined 'generically'.
> public static interface Test<T extends Number>
> {
> public T getSomething();
>
> public void setSomething(T something);
> }
>
> // A concrete class using a specific genericization of the interface (Long), with getter and setter implemented appropriately.
> public static class Test2 implements Test<Long>
> {
> public Long getSomething()
> {
> return(null);
> }
>
> public void setSomething(Long something)
> {
>
> }
> }
> }
> {code}
> When run on Windows XP, and working correctly, this prints:
> something class java.lang.Long public java.lang.Long Testing$Test2.getSomething() false false
> indicating that it got the 'long' version of the method, and that this method is NOT synthetic or a bridge method.
> However, when run on Linux, this prints:
> something class java.lang.Number public volatile java.lang.Number Testing$Test2.getSomething() true true
> which is the signature from the interface, and is marked with both synthetic and bridge, indicating that this is not the 'real' method, but the compiler-created method due to generics.
> I think that it should be ignoring the 'synthetic/bridge' method auto-created by the compiler, but I'm not sure why it is environment-dependent. Perhaps the environment somehow controls the method definition order? (At runtime, not compile time, obviously.)
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