Drools报错:java.lang.NoClassDefFoundError: org/antlr/runtime/CharStream

java.lang.NoClassDefFoundError: org/antlr/runtime/CharStream
at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:292)
at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:457)
at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:30)
at com.sample.DroolsTest.readKnowledgeBase(DroolsTest.java:40)
at com.sample.DroolsTest.main(DroolsTest.java:23)

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解决办法：

把drools自带的antlr包加进去就ok了

对于5.0版本：

Drools 5.0.0.M4\drools-5.0.0.M4-bin\lib\antlr-runtime-3.1.1.jar