Drools的运行时异常（java.lang.ClassCastException：org.drools.io.impl.ClassPathResource无法强制转换为org.drools.io.InternalResource）

Question

I have all the required JARS. Even though facing below issue:

java.lang.ClassCastException: org.drools.io.impl.ClassPathResource cannot be cast to org.drools.io.InternalResource
    at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:487)
    at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)

attached images for the reference

Answer 1

It is too little information but I guess that you should create resource using the method ResourceFactory.newClassPathResource.

I had similar exception lately. I tried to use following code:

final KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add((Resource) new ByteArrayResource(data.getBytes()), ResourceType.DRL);

I had to change the second line to this one:

kbuilder.add(ResourceFactory.newByteArrayResource(data.getBytes()), ResourceType.DRL);

Try to make analogous changes in your code (note that you have classPathResource not byteArrayResource).