[rules-users] Serialization in Drools 5.0 M2

[Mark Proctor]

Siddhartha Banik wrote:
> Hi Michal,
>
> Thanks for your reply.
> I have got a better idea about marshalling now. After I have made the
> changes you suggested, the things are working now.
>
> There is a bug in "SerializablePlaceholderResolverStrategy.java" file
> Line#38. Recursive call is made inside the method "public boolean
> accept(Object object)" . So marshalling is failing with stackOverflowError.
>   
I think that is fixed... This is what I have in trunk:
    public boolean accept(Object object) {
        return acceptor.accept( object );
    }

Doesn't look recursive to me.
> The blog
> "http://blog.athico.com/2008/05/efficient-binary-protocol-marshalling.html"
> says : 
>
> It's still very alphaware. The following types don't yet marshall, not sure
> how to handle date/time stuff at the moment. Implementations have not been
> added for accumulate, collect, from and rightinputadapter.
>
> If these issues are fixed in Drools 5.0 M2 release? 
>
> Best Regards!
> Siddhartha
>
>
> Siddhartha Banik wrote:
>   
>> Hi Drools Team,
>>
>> I am trying out new Serialization technique introduced in Drools 5.0 using
>> "
>> org.drools.marshalling.DefaultMarshaller".
>>
>> The use case I am trying, is:
>>                                       Create a Stateful session.
>>                                       Then Serialize that.
>>                                       Try to load the the serialized
>> session
>> back.
>>
>> Loading of serialized session is working good if, I try that in same java
>> program & same object of DefaultMarshaller is used during serialization &
>> de
>> serialization of the Stateful session.
>>
>> But, when I tried a different instance of DefaultMarshaller to read back
>> the
>> saved session, that is not working anymore. I am getting a exception :
>>
>> java.lang.NullPointerException
>>  at org.drools.common.DefaultFactHandle.<init>(DefaultFactHandle.java:78)
>>  at
>> org.drools.marshalling.InputMarshaller.readFactHandle(InputMarshaller.java:331)
>>  at
>> org.drools.marshalling.InputMarshaller.readFactHandles(InputMarshaller.java:277)
>>  at
>> org.drools.marshalling.InputMarshaller.readSession(InputMarshaller.java:179)
>>  at
>> org.drools.marshalling.DefaultMarshaller.read(DefaultMarshaller.java:58)
>>  at
>> org.drools.marshalling.DefaultMarshaller.read(DefaultMarshaller.java:15)
>>  at
>> org.drools.reteoo.ReteooRuleBase.readStatefulSession(ReteooRuleBase.java:277)
>>  at
>> org.drools.common.AbstractRuleBase.readStatefulSession(AbstractRuleBase.java:321)
>>  at
>> com.sample.test.NewMarshallingTest.testSerializationInFile_1(NewMarshallingTest.java:79)
>>  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
>>  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>>  at java.lang.reflect.Method.invoke(Unknown Source)
>>  at junit.framework.TestCase.runTest(TestCase.java:154)
>>  at junit.framework.TestCase.runBare(TestCase.java:127)
>>  at junit.framework.TestResult$1.protect(TestResult.java:106)
>>  at junit.framework.TestResult.runProtected(TestResult.java:124)
>>  at junit.framework.TestResult.run(TestResult.java:109)
>>  at junit.framework.TestCase.run(TestCase.java:118)
>>  at
>> org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)
>>  at
>> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>>  at
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:460)
>>  at
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:673)
>>  at
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:386)
>>  at
>> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:196)
>>
>> With Drools 4.0.7 ... I can serialize a Stateful session & at later point
>> of
>> time I can deserialize that back. For our usecase, the feature is very
>> critical.
>>
>> Does Drools 5.0 support that ?  DefaultMarshaller is not serializable. So
>> once a  Stateful session is serialized. At Later point of time, I am not
>> able to read that back.
>>
>> I have attached my test files.
>>
>>
>> Best Regards!
>> Siddhartha
>>
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>>
>>
>>     
>
>   

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