[rules-users] Serialization in Drools 5.0 M2

[siddhartha banik]

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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