Deserializing large files

[ingmarstein]

Hi all,

I'm experiencing a strange problem concerning the deserialization of large files.

When I try to read from an ObjectInputStream whose
underlying buffer is larger than a certain threshold
(it works with 300k, but fails with 900k), then I
get a NullPointerException.
It doesn't matter if the ObjectInputStream operates
on a FileInputStream or a ByteArrayInputStream, the
error occurs in the readObject method.

The exact location where the Exception is thrown is
here:

public int hashCode() {
>>> return getName().hashCode();
}

For some reason, the name field is set to null
although it is non-null in the serialized class.

What is even more confusing is the fact that it
works fine outside JBoss, i.e. as a standalone
console application.

This is JBoss' stacktrace:

10:50:29,111 ERROR [STDERR] java.lang.NullPointerException
10:50:29,111 ERROR [STDERR] at Entry.hashCode(Unknown Source)
10:50:29,111 ERROR [STDERR] at java.util.HashMap.hash(HashMap.java:257)
10:50:29,111 ERROR [STDERR] at java.util.HashMap.putForCreate(HashMap.java:400)
10:50:29,111 ERROR [STDERR] at java.util.HashMap.readObject(HashMap.java:987)
10:50:29,111 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:50:29,157 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10:50:29,157 ERROR [STDERR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
10:50:29,157 ERROR [STDERR] at java.lang.reflect.Method.invoke(Method.java:324)
10:50:29,157 ERROR [STDERR] at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:824)
10:50:29,157 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
10:50:29,157 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
10:50:29,157 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
10:50:29,157 ERROR [STDERR] at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1845)
10:50:29,157 ERROR [STDERR] at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1769)
10:50:29,173 ERROR [STDERR] at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
10:50:29,173 ERROR [STDERR] at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
10:50:29,173 ERROR [STDERR] at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
10:50:29,173 ERROR [STDERR] at ....
10:50:29,173 ERROR [STDERR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

As you can see, the following code in HashMap.java
fails:

for(int i=0; i<size; i++) {
Object key = s.readObject();
Object value = s.readObject();
putForCreate(key, value)
}

"key" is read correcly, but it is probably invalidated inside putForCreate().

Thanks in advance,

Ingmar