[rules-users] drools linkage errors

[mani koduri]

Hi,

Initially I am using jboss-drool 5.0.1 version in our project and I updated
to jboss-drools 5.4.0 version in our project but I am getting linkage
errors as mentioned below.

*java.lang.LinkageError: loader (instance of
org/drools/rule/JavaDialectRuntimeData$PackageClassLoader): attempted*
*duplicate class definition for name:
"com/ds/rule/vm/fvm/ruleengine/Rule_Product_has_minimum_number_of_valid_quotes_5263d589f8864649bbb734bada7a54ed"
*
*        at java.lang.ClassLoader.defineClass1(Native Method)
[rt.jar:1.6.0_30]*
*        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
[rt.jar:1.6.0_30]*
*        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
[rt.jar:1.6.0_30]*
*        at
org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:615)
[drools-core-5.4.0.Final.jar:5.4.0.Final]*
*        at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:254)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]*
*        at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:237)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]*
*        at
org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:88)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]*
*        at java.lang.ClassLoader.loadClass(ClassLoader.java:295)
[rt.jar:1.6.0_30]*
*        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
[rt.jar:1.6.0_30]*
*        at
a.b.c.Rule_person___unique___name_656ee3db19d34e689d95e2d6b2be67b6Eval0InvokerGenerated.evaluate(Unknown
Source)*
*        at
a.b.c.Rule_person___unique___name_656ee3db19d34e689d95e2d6b2be67b6Eval0Invoker.evaluate(Unknown
Source)*
*        at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
[drools-core-5.4.0.Final.jar:5.4.0.Final]*

And each time I ran the project I am getting same error but on different
rules.

Could you please help me out how to solve this issue?

with regards,
k.chaitanya.
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