Drools KieContainer from different ClassLoader

user_4141980 0
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We have a Java application with different modules being deployed on Weblogic. We are using drools on different modules and tried to make the class that initializes the KieContainer a singleton by defining it as an enum class.

However, it seems that when we are in the production environment (where the application is deployed through a ear file) there are different ClassLoaders initializing this class and we get the following exception:

null    java.lang.IllegalStateException: There's already another KieContainer created from a different ClassLoader; 
at org.drools.compiler.kie.builder.impl.KieServicesImpl.getKieClasspathContainer(KieServicesImpl.java:88); 
at org.drools.compiler.kie.builder.impl.KieServicesImpl.getKieClasspathContainer(KieServicesImpl.java:73);

Do you have any suggestion on how to solve this?

kie drools weblogic java
2 Answers

The drools code checks if your specified class loader and the current instance this.getClass().getClassLoader() is the same, if not errors out with the KieContainer already exists eror . If you dont specify a classloader it uses Thread.currentThread().getContextClassLoader() , which is different from this.getClass().getClassLoader() in some situvations. Simple solution is to use KieServices.Factory.get().getKieClasspathContainer(this.getClass().getClassLoader())

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