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
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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