@David- thanks for your reply.

In the patch, we have applied synchronise block, we referred to 6.0.0 release.

Still it’s throwing LinkageError for the same,

Regards,

Karan

Hi All,

 

We have recently upgraded our application from 5.1.0 to 5.4.0.Final.

 

Everything worked well until this was deployed at Production Envr. We started getting multiple Linkage Error in execute method of Stateless KnowledgeSession.

 

StackTrace:

 

Exception: java.util.concurrent.ExecutionException: java.lang.LinkageError: loader (instance oforg/drools/rule/JavaDialectRuntimeData$PackageClassLoader): attemptedduplicate class definition for name: "OffBarCapping/Rule_Off_Bar_Tariff_Capping_13_2a4a909def69414bbd60cdfdac9ad807"|

 

OffBarCapping/Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1f#      at OffBarCapping.Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1fPredicate0InvokerGenerated.evaluate(Unknown Source)#    at OffBarCapping.Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1fPredicate0Invoker.evaluate(Unknown Source)#     at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:299)# at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)#        at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)#   at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)#     at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)#      at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)#      at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337)#  at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)#  at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)#      at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)#      at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)#  at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:294)#

 

1.    Some surfing on the internet referred us to a similar JIRA issue:- JBRULES-3675

It says this has been fixed in 6.0.0. We were not in a position to upgrade to 6.0.0 right away and hence decide to apply a patch in drools-core-5.4.0.Final.jar

 

Drools: 5.4.0

public Class<?> More ...fastFindClass( final String name ) {

            Class<?> cls = findLoadedClass( name );

 

            if (cls == null) {

                final byte[] clazzBytes = this.store.read( convertClassToResourcePath( name ) );

                if (clazzBytes != null) {

                    String pkgName = name.substring( 0,

                                                     name.lastIndexOf( '.' ) );

                    if (getPackage( pkgName ) == null) {

                        definePackage( pkgName,

                                      "",

                                       "",

                                       "",

                                       "",

                                       "",

                                       "",

                                       null );

                    }

 

                    cls = defineClass( name,

                                       clazzBytes,

                                       0,

                                      clazzBytes.length,

                                       PROTECTION_DOMAIN );

                }

                if (cls != null) {

                    resolveClass( cls );

                }

            }

            return cls;

        }

 

Path applied:-

 

public Class fastFindClass(String name)

    {

        Class cls = findLoadedClass(name);

        if(cls == null)

        {

            byte clazzBytes[] = store.read(JavaDialectRuntimeData.convertClassToResourcePath(name));

            if(clazzBytes != null)

            {

                String pkgName = name.substring(0, name.lastIndexOf('.'));

                if(!existingPackages.contains(pkgName))

                {

                    synchronized(this)

                    {

                        if(!existingPackages.contains(pkgName))

                        {

                            if(getPackage(pkgName) == null)

                            {

                                definePackage(pkgName, "", "", "", "", "", "", null);

                            }

                            existingPackages.add(pkgName);

                        }

                    }

                }

                cls = defineClass(name, clazzBytes, 0, clazzBytes.length, JavaDialectRuntimeData.access$000());

            }

            if(cls != null)

            {

                resolveClass(cls);

            }

        }

        return cls;

    }

 

But we are still getting this Error.

 

Let me know if any one did face a similar issue and solution for the same.

 

Thanks and regards,

Karan Malhotra

 

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