noon
Hi,
I experienced the problem while reading WorkingMemory using
ObjectInputStream. I'm attaching the code that cause the following
exception:
java.lang.ClassCastException: java.io.ObjectInputStream
at org.drools.reteoo.Rete$ClassObjectTypeConf.readObject(Rete.java:605)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at
org.drools.util.AbstractHashTable.readExternal(AbstractHashTable.java:66)
at org.drools.util.ObjectHashMap.readExternal(ObjectHashMap.java:41)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1634)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at com.sample.DroolsTest5.main(DroolsTest5.java:52)
What's wrong?
Best regards!
--
Przemysław Różycki
IT Architect
AMG.net, A Bull Group Company
ul. Łąkowa 29
90-554 Łódź
www.amg.net.pl
7:26 a.m.
Przemysław Różycki pisze:
Hi,
I experienced the problem while reading WorkingMemory using
ObjectInputStream. I'm attaching the code that cause the following
exception:
I looked closer at it and IMHO, its a bug, so I reported it to JBoss Jira:
https://jira.jboss.org/jira/browse/JBRULES-1925
Best regards,
--
Przemysław Różycki
IT Architect
AMG.net, A Bull Group Company
ul. Łąkowa 29
90-554 Łódź
www.amg.net.pl
9:36 p.m.
Hi Przemysław,
I am using Drools BRMS and I had this error when the Facts Models
deployed in BRMS isn't up to date with the source code or vice -versa.
Perhaps, your WorkingMemory was serialized using another version of your
Model.
Best regards,
--
Rafael Felini.
rafael.felini(a)gmail.com
On Mon, Jan 19, 2009 at 10:26 AM, Przemysław Różycki
<P.Rozycki(a)amg.net.pl>wrote:
Przemysław Różycki pisze:
> Hi,
>
> I experienced the problem while reading WorkingMemory using
> ObjectInputStream. I'm attaching the code that cause the following
> exception:
>
I looked closer at it and IMHO, its a bug, so I reported it to JBoss Jira:
https://jira.jboss.org/jira/browse/JBRULES-1925
Best regards,
--
Przemysław Różycki
IT Architect
AMG.net, A Bull Group Company
ul. Łąkowa 29
90-554 Łódź
www.amg.net.pl
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3:54 a.m.
New subject: WorkingMemory problem when reading using ObjectInputStream (Drools 4.0.7)
Rafael Felini wrote:
Hi Przemysław,
I am using Drools BRMS and I had this error when the Facts Models
deployed in BRMS isn't up to date with the source code or vice -versa.
Perhaps, your WorkingMemory was serialized using another version of
your Model.
Best regards,
--
Rafael Felini.
Hi Rafael,
thanks for your response. Was yor stack trace the same as mine or just
similair? I don't think my model is not up to date. The attached example
is very simple and I don't think the model matters in it's case. I don't
know if you tried to run it (it's really simple application), but I
think the problem is reproducible in 100%.
BTW, I was going on with my research about this issue and I followed my
stack trace, looked at Rete.java, line 605 and found that it belongs to
the method
private void readObject(ObjectInputStream stream)
and contains code:
this.ruleBase = ((DroolsObjectInputStream) stream).getRuleBase();
And... now it's clear where the ClassCastException comes from. I don't
think it's a good practice to require that deserialization is done with
some special input stream. Everyting is fine when you use just Drools
components, like BRMS or when you control 100% of your code. But I want
to place my working memory in BEA Weblogic's JNDI and it uses just
ObjectInputStream to read the serialized object and I can't change it.
Documentation says that working memory is serializable and there
souldn't be any problem with operations like placing it in JNDI and
Drools API docs does not mention anything about the requirement of using
DroolsObjectInputStream. That's why I think, it's a bug.
I'm thinking about any workaround. Does anyone know if JBoss Cache has
any problems with containing StatefulSession object?
Best regards,
Przemek
6196
days inactive
6200
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3 comments
2 participants
participants (2)
-
Przemysław Różycki -
Rafael Felini