Groovy 与 Java / Spring 集成导致类转换异常

Question

我正在使用 Spring Boot starter 2.3.1，Groovy-all 2.4.13。 我有一种机制，使我能够在运行时从我的 Java 程序中执行 Groovy 脚本。 如下所示：

GroovyShell groovyShell = new GroovyShell(this.getClass().getClassLoader());
Class<Script> pScriptClass = groovyShell.parse(pScriptString).getClass();
Script pScriptObject = pScriptClass.newInstance();
pScriptObject.setBinding(pBinding);
return pScriptObject.invokeMethod("process", null);

只要脚本不涉及任何强制转换，它就可以正常运行。 但是，在我的一个脚本中，我有一个 class 铸件，如下所示：

Object process(){
   RestServiceUtil resServ = (RestServiceUtil) applicationContext.getBean("restServiceUtil");
   .
   .
   .
}

In the case above I understand that the LHS refers to the class object from the GroovyClassLoader whereas the RHS is from the java class loader. 但是，无论我发现什么，这都不会造成问题，因为 GroovyShell 是使用 java class 加载程序作为父级创建的，即new GroovyShell(this.getClass().getClassLoader())

但是当我尝试运行这个脚本时，我仍然看到 class 转换异常。 由于 Groovy class 加载器使用的是 Java ZA2F2ED4F8EBC2CBB4C21A29DC40AB619Z ZA2F2ED4F8EBC2CBB4C21A29DC40AB6 加载器，因此认为我们应该将两个加载器分别编译为父级。

org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object 'com.bell.na.nt.bnsm.nets.consumer.utils.RestServiceUtil@1f239d3f' with class 'com.bell.na.nt.bnsm.nets.consumer.utils.RestServiceUtil$$EnhancerBySpringCGLIB$$88984819' to class 'com.bell.na.nt.bnsm.nets.consumer.utils.RestServiceUtil'
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnSAM(DefaultTypeTransformation.java:405) ~[groovy-all-2.4.13.jar:2.4.13]
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:319) ~[groovy-all-2.4.13.jar:2.4.13]
    at org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:232) ~[groovy-all-2.4.13.jar:2.4.13]
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.castToType(ScriptBytecodeAdapter.java:603) ~[groovy-all-2.4.13.jar:2.4.13]
    at Script33.process(Script33.groovy:16) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_282]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1213) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:803) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.GroovyObjectSupport.invokeMethod(GroovyObjectSupport.java:46) ~[groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.Script.invokeMethod(Script.java:80) ~[groovy-all-2.4.13.jar:2.4.13]
    at com.bell.na.nt.remedy.groovy.NetsUtilityGroovyUtils.execute(NetsUtilityGroovyUtils.java:62) ~[ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.json.utils.NetsUtilityJSONDatumUtils.getJsonValue(NetsUtilityJSONDatumUtils.java:260) [ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.json.utils.NetsUtilityJSONDatumUtils.createPlainJsonObjectFromJsonObject(NetsUtilityJSONDatumUtils.java:169) [ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.json.utils.NetsUtilityJSONDatumUtils$createPlainJsonObjectFromJsonObject.call(Unknown Source) [ms-nets-utility-library-1.0.jar:1.0]
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48) [groovy-all-2.4.13.jar:2.4.13]
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113) [groovy-all-2.4.13.jar:2.4.13]
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125) [groovy-all-2.4.13.jar:2.4.13]
    at Script8.process(Script8.groovy:17) [shell:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_282]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
    at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1213) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:803) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.GroovyObjectSupport.invokeMethod(GroovyObjectSupport.java:46) [groovy-all-2.4.13.jar:2.4.13]
    at groovy.lang.Script.invokeMethod(Script.java:80) [groovy-all-2.4.13.jar:2.4.13]
    at com.bell.na.nt.remedy.groovy.NetsUtilityGroovyUtils.execute(NetsUtilityGroovyUtils.java:62) [ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.json.utils.NetsUtilityJSONDatumUtils.getJsonValue(NetsUtilityJSONDatumUtils.java:260) [ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.json.utils.NetsUtilityJSONDatumUtils.createPlainJsonObjectFromJsonObject(NetsUtilityJSONDatumUtils.java:169) [ms-nets-utility-library-1.0.jar:1.0]
    at com.bell.na.nt.bnsm.nets.consumer.service.BNSMNETSReaderService.transformJSONMsg(BNSMNETSReaderService.java:138) [classes/:?]
    at com.bell.na.nt.bnsm.nets.consumer.service.BNSMNETSReaderService.iterativelyTrnsfrmJSON(BNSMNETSReaderService.java:117) [classes/:?]
    at com.bell.na.nt.bnsm.nets.consumer.service.BNSMNETSReaderService.processEventMessage(BNSMNETSReaderService.java:76) [classes/:?]
    at com.bell.na.nt.bnsm.nets.consumer.processor.EventReaderMessageProcessor.processMessage(EventReaderMessageProcessor.java:42) [classes/:?]
    at com.bell.na.nt.kafka.consumer.KafkaConsumer.onMessage(KafkaConsumer.java:52) [spring-kafka-consumer-module-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_282]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_282]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_282]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_282]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:171) [spring-messaging-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.messaging.handler.invocation.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:120) [spring-messaging-5.2.7.RELEASE.jar:5.2.7.RELEASE]
    at org.springframework.kafka.listener.adapter.HandlerAdapter.invoke(HandlerAdapter.java:48) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter.invokeHandler(MessagingMessageListenerAdapter.java:329) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:86) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter.onMessage(RecordMessagingMessageListenerAdapter.java:51) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeOnMessage(KafkaMessageListenerContainer.java:1878) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeOnMessage(KafkaMessageListenerContainer.java:1860) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeRecordListener(KafkaMessageListenerContainer.java:1797) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.doInvokeWithRecords(KafkaMessageListenerContainer.java:1737) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeRecordListener(KafkaMessageListenerContainer.java:1634) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.invokeListener(KafkaMessageListenerContainer.java:1364) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.pollAndInvoke(KafkaMessageListenerContainer.java:1080) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at org.springframework.kafka.listener.KafkaMessageListenerContainer$ListenerConsumer.run(KafkaMessageListenerContainer.java:988) [spring-kafka-2.5.4.RELEASE.jar:2.5.4.RELEASE]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_282]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_282]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282]

在这方面的任何帮助将不胜感激。

Answer 1

所以显然是两个不同的类加载器层次结构导致了问题。 Java class 加载器，然后是这个 GroovyClassLoader，它具有相同的 Object 的单独实例，它试图转换为类似于我们在下面看到的东西。

因此，以下使用 java class 加载器作为父加载器初始化 groovyclassloader 的方法应该有效。 GroovyShell groovyShell = new GroovyShell(this.getClass().getClassLoader());