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Subject: RE: [classlib][awt] test org.apache.harmony.awt.ListenerListTest
 failed on Linux x86_64
Date: Fri, 29 Jun 2007 11:40:03 +0400
Message-ID: <2A786EB15713B544AB79607529273B04DB20E4@mssmsx411>
In-Reply-To: <2A786EB15713B544AB79607529273B04DB1F66@mssmsx411>
Thread-Topic: [classlib][awt] test org.apache.harmony.awt.ListenerListTest
 failed on Linux x86_64
thread-index: Ace5g9RGmiWhkGjQQWGGD8beCpZ3OQAA5geQACTIBsA=
References: <7273946b0706212321u6c934b75m63ff2fc134083e51@mail.gmail.com>
 <2A786EB15713B544AB79607529273B04DB1F24@mssmsx411>
 <2c9597b90706280556w7802013n5cace686ae9d0057@mail.gmail.com>
 <2A786EB15713B544AB79607529273B04DB1F66@mssmsx411>
From: "Pavlenko, Andrey A" <andrey.a.pavlenko@intel.com>
To: <dev@harmony.apache.org>

I've added additional test case to this test:

    static class Tmp implements Serializable {}

    private ArrayList l =3D new ArrayList();

    public void test() throws IOException {
        l.add(new Tmp());
        ByteArrayOutputStream byteStream =3D new
ByteArrayOutputStream(512);
        ObjectOutputStream oos =3D new ObjectOutputStream(byteStream);
        oos.writeObject(l);
        oos.flush();
        oos.close();
    }

This test case also fails with the same error:

java.lang.NullPointerException
at
java.io.ObjectStreamClass.buildFieldDescriptors(ObjectStreamClass.java:3
22)
at java.io.ObjectStreamClass.createClassDesc(ObjectStreamClass.java:229)
at
java.io.ObjectStreamClass.lookupStreamClass(ObjectStreamClass.java:907)
at
java.io.ObjectStreamClass.lookupStreamClass(ObjectStreamClass.java:884)
at
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1
844)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1770)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1734)
at
org.apache.harmony.awt.ListenerListTest.test(ListenerListTest.java:44)
at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java)

So, it seems to be not AWT issue. The NPE happens because the method
java.io.ObjectStreamField.getType() sometimes returns null. This happens
intermittent and only when I run the test in batch with other AWT tests.
The null value of the field type appears in the method
ObjectStreamField.getTypeInternal() which extracts the type from a weak
reference. See the following code:

--- ObjectStreamField.java ---
    private Class<?> getTypeInternal() {
        if (type instanceof WeakReference) {
            return (Class<?>) ((WeakReference<?>) type).get(); <-- !!!
        }
        return (Class<?>) type;
    }

    public Class<?> getType() {
        Class<?> cl =3D getTypeInternal();
        if (isDeserialized && !cl.isPrimitive()) {
            return Object.class;
        }
        return cl;
    }
--------------------

Could somebody take a look at this issue?

-----Original Message-----
From: Pavlenko, Andrey A [mailto:andrey.a.pavlenko@intel.com]=20
Sent: Thursday, June 28, 2007 5:40 PM
To: dev@harmony.apache.org
Subject: RE: [classlib][awt] test
org.apache.harmony.awt.ListenerListTest failed on Linux x86_64

I used debug. I reproduced the failure on release build.

Now I can reproduce the failure only using release build and only
running this test in a batch with all AWT tests, but in standalone mode
this test passes.=20

-----Original Message-----
From: Alexei Zakharov [mailto:alexei.zakharov@gmail.com]=20
Sent: Thursday, June 28, 2007 4:56 PM
To: dev@harmony.apache.org
Subject: Re: [classlib][awt] test
org.apache.harmony.awt.ListenerListTest failed on Linux x86_64

Andrey,

Do you use the release version of classlib & DRLVM builds? Or debug?

Regards,

2007/6/28, Pavlenko, Andrey A <andrey.a.pavlenko@intel.com>:
> Vladimir,
>
> I can't reproduce this failure on SLES9 x86_64.
>
> -----Original Message-----
> From: Vladimir Ivanov [mailto:ivavladimir@gmail.com]
> Sent: Friday, June 22, 2007 10:21 AM
> To: dev
> Subject: [classlib][awt] test org.apache.harmony.awt.ListenerListTest
> failed on Linux x86_64
>
> Classlib test org.apache.harmony.awt.ListenerListTest failed DRLVM on
> Linux x86_64 with execution log:
> -------------------------------------------------------------------
> org.apache.harmony.awt.ListenerListTest
>  java.lang.NullPointerException
>  at
>
java.io.ObjectStreamClass.buildFieldDescriptors(ObjectStreamClass.java:3
> 22)
>  at
> java.io.ObjectStreamClass.createClassDesc(ObjectStreamClass.java:229)
>  at
>
java.io.ObjectStreamClass.lookupStreamClass(ObjectStreamClass.java:907)
>  at
>
java.io.ObjectStreamClass.lookupStreamClass(ObjectStreamClass.java:884)
>  at
>
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1
> 848)
>  at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1774)
>  at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1738)
>  at
> org.apache.harmony.awt.ListenerList.writeObject(ListenerList.java:180)
>  at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java)
>  at
>
java.io.ObjectOutputStream.writeHierarchy(ObjectOutputStream.java:1305)
>  at
>
java.io.ObjectOutputStream.writeNewObject(ObjectOutputStream.java:1663)
>  at
>
java.io.ObjectOutputStream.writeObjectInternal(ObjectOutputStream.java:1
> 931)
>  at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1774)
>  at
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:1738)
>  at
>
org.apache.harmony.awt.ListenerListTest.writeAndRead(ListenerListTest.ja
> va:57)
>  at
>
org.apache.harmony.awt.ListenerListTest.testSerialize(ListenerListTest.j
> ava:46)
>  at java.lang.reflect.VMReflection.invokeMethod(VMReflection.java)
>  ---------------------------------------------
>
>  Could someone take care about this issue?
>  thanks, Vladimir
>


--=20
Alexei Zakharov,
Intel ESSD