dubbo java.lang.StackOverflowError: null

博客主要讲述了调试Dubbo时遇到java.lang.StackOverflowError的情况。一是传输对象中存在未实现序列化的属性,二是要考虑 -Xss1m 值是否足够,因为有些组件会在方法栈中缓存动态方法,容器设置可能比JDK默认值小。

调试dubbo时遇到情况:

ERROR org.apache.dubbo.rpc.filter.ExceptionFilter -  [DUBBO] Got unchecked and undeclared exception which called by service, method:  exception: java.lang.StackOverflowError: null

触发 dubbo java.lang.StackOverflowError: null 情况:

  1. 传输对象中存在没有实现序列化的属性
  2. -Xss1m 值是否足够(有些组件会在方法栈中缓存动态方法, 有时容器设置的是 -Xss256k, 比jdk默认的1m小)
18:59:36:266 INFO 14408 --- [erverWorker-5-2] o.a.d.r.t.netty4.NettyChannelHandler : [DUBBO] The connection [id: 0x94d7e30a, L:/10.44.85.106:50052 - R:/10.44.85.106:6935] of 10.44.85.106:6935 -> 10.44.85.106:50052 is established., dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:317 DEBUG 14408 --- [erverWorker-5-2] .a.d.r.p.t.r.m.RestRequestHandlerMapping : [DUBBO] Received http request: ServletHttpRequestAdapter{method='GET', uri='/carts', contentType='null'}, dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:318 DEBUG 14408 --- [erverWorker-5-2] .r.p.t.r.m.DefaultRequestMappingRegistry : [DUBBO] Matched rest mapping=RequestMapping{name='CartControllerImpl#queryMyCarts', path=PathCondition{paths=[/carts]}, methods=MethodsCondition{methods=[GET]}}, method=MethodMeta{method=com.hmall.cartdubbo.controller.CartController.queryMyCarts(), service=CartControllerImpl@5112858c}, dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:321 DEBUG 14408 --- [erverWorker-5-2] .a.d.r.p.t.r.m.RestRequestHandlerMapping : [DUBBO] Content-type negotiate result: request='null', response='application/json', dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:331 DEBUG 14408 --- [:50052-thread-3] eataTransactionPropagationProviderFilter : [DUBBO] Server side xid in RpcContext[null], dubbo version: 3.3.0, current host: 10.44.85.106 坤坤invoke执行力! 18:59:36:334 INFO 14408 --- [:50052-thread-3] d.r.p.t.r.f.RestExtensionExecutionFilter : [DUBBO] Rest filter [org.apache.dubbo.rpc.protocol.tri.rest.support.spring.SpringResponseRestFilter@6c396fdb] loaded, dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:334 INFO 14408 --- [:50052-thread-3] d.r.p.t.r.f.RestExtensionExecutionFilter : [DUBBO] Rest filters for [tri://10.44.85.106:50052/com.hmall.cartdubbo.controller.CartController?anyhost=true&application=cart-service&background=false&bind.ip=10.44.85.106&bind.port=50052&deprecated=false&dubbo=2.0.2&dynamic=true&executor-management-mode=isolation&file-cache=true&generic=false&interface=com.hmall.cartdubbo.controller.CartController&ipv6=2001:da8:2018:2232:6afe:a1f1:e229:a6bd&methods=addItem2Cart,deleteCartItem,queryMyCarts,updateCart&pid=14408&prefer.serialization=hessian2,fastjson2&release=3.3.0&service-name-mapping=true&side=provider&timestamp=1754823561433] loaded: [org.apache.dubbo.rpc.protocol.tri.rest.support.spring.SpringResponseRestFilter@6c396fdb], dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:389 DEBUG 14408 --- [:50052-thread-3] c.h.c.mapper.CartMapper.selectList : ==> Preparing: SELECT id,user_id,item_id,num,name,spec,price,image,create_time,update_time FROM cart WHERE (user_id = ?) 18:59:36:393 DEBUG 14408 --- [:50052-thread-3] c.h.c.mapper.CartMapper.selectList : ==> Parameters: 1(Long) 18:59:36:407 DEBUG 14408 --- [:50052-thread-3] c.h.c.mapper.CartMapper.selectList : <== Total: 5 18:59:36:455 DEBUG 14408 --- [:50052-thread-3] o.a.d.r.c.s.wrapper.ScopeClusterInvoker : [DUBBO] Performing remote call for method: queryItemByIds of service: com.hmall.apidubbo.client.ItemClient, dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:461 DEBUG 14408 --- [:50052-thread-3] eataTransactionPropagationConsumerFilter : [DUBBO] Client side xid in RootContext[null], dubbo version: 3.3.0, current host: 10.44.85.106 坤坤invoke执行力! 18:59:36:681 ERROR 14408 --- [:50052-thread-3] o.a.dubbo.rpc.filter.ExceptionFilter : [DUBBO] Got unchecked and undeclared exception which called by 10.44.85.106. service: com.hmall.cartdubbo.controller.CartController, method: queryMyCarts, exception: java.lang.NullPointerException: null, dubbo version: 3.3.0, current host: 10.44.85.106, error code: 5-36. This may be caused by , go to https://dubbo.apache.org/faq/5/36 to find instructions. java.lang.NullPointerException: null at com.hmall.itemdubbo.controller.ItemDubbo.queryItemByIds(ItemDubbo.java:25) ~[na:na] at com.hmall.itemdubbo.controller.ItemDubboDubboWrap0.invokeMethod(ItemDubboDubboWrap0.java) ~[na:na] at org.apache.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:89) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:100) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:55) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ClassLoaderCallbackFilter.invoke(ClassLoaderCallbackFilter.java:38) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.HttpContextCallbackFilter.invoke(HttpContextCallbackFilter.java:37) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.rest.filter.RestFilterAdapter.invoke(RestFilterAdapter.java:38) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at com.alibaba.dubbo.rpc.Invoker$CompatibleInvoker.invoke(Invoker.java:77) ~[dubbo-3.3.0.jar:3.3.0] at io.seata.integration.dubbo.alibaba.AlibabaDubboTransactionPropagationFilter.invoke(AlibabaDubboTransactionPropagationFilter.java:45) ~[seata-all-2.0.0.jar:2.0.0] at com.alibaba.dubbo.rpc.Filter.invoke(Filter.java:34) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at com.hmall.commondubbo.filter.UserInfoDubboFilter.invoke(UserInfoDubboFilter.java:40) ~[classes/:na] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:80) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:45) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.seata.SeataTransactionPropagationProviderFilter.invoke(SeataTransactionPropagationProviderFilter.java:66) ~[dubbo-filter-seata-1.0.2.jar:1.0.2] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:109) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:55) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.AccessLogFilter.invoke(AccessLogFilter.java:120) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:222) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.HttpContextFilter.invoke(HttpContextFilter.java:50) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:54) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:41) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.metrics.filter.MetricsFilter.invoke(MetricsFilter.java:86) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.metrics.filter.MetricsProviderFilter.invoke(MetricsProviderFilter.java:37) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ProfilerServerFilter.invoke(ProfilerServerFilter.java:66) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:191) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CallbackRegistrationInvoker.invoke(FilterChainBuilder.java:197) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerCallListener.invoke(AbstractServerCallListener.java:69) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.UnaryServerCallListener.onComplete(UnaryServerCallListener.java:50) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener$Http2StreamingDecodeListener.onClose(GenericHttp2ServerTransportListener.java:201) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.DefaultListeningDecoder.close(DefaultListeningDecoder.java:47) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.StreamingDecoder$DefaultFragmentListener.onClose(StreamingDecoder.java:60) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.LengthFieldStreamingDecoder.deliver(LengthFieldStreamingDecoder.java:135) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.LengthFieldStreamingDecoder.close(LengthFieldStreamingDecoder.java:81) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener.onDataCompletion(GenericHttp2ServerTransportListener.java:143) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener.onDataCompletion(GenericHttp2ServerTransportListener.java:49) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.doOnData(AbstractServerTransportListener.java:187) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.lambda$onData$1(AbstractServerTransportListener.java:171) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.common.threadpool.serial.SerializingExecutor.run(SerializingExecutor.java:105) ~[dubbo-3.3.0.jar:3.3.0] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na] at org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:39) ~[dubbo-3.3.0.jar:3.3.0] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] 18:59:36:686 DEBUG 14408 --- [:50052-thread-3] .d.r.h.AbstractServerHttpChannelObserver : [DUBBO] Http response body sent: '{"status":"500"}' by [org.apache.dubbo.remoting.http12.netty4.h1.NettyHttp1Channel@ec3e387], dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:689 DEBUG 14408 --- [:50052-thread-3] .d.r.h.AbstractServerHttpChannelObserver : [DUBBO] Http response headers sent: NettyHttp1HttpHeaders{headers=DefaultHttpHeaders[:status: 500, content-type: application/json, alt-svc: h2=":50052", content-length: 16]}, dubbo version: 3.3.0, current host: 10.44.85.106 18:59:36:646 ERROR 17804 --- [:50053-thread-3] o.a.dubbo.rpc.filter.ExceptionFilter : [DUBBO] Got unchecked and undeclared exception which called by 10.44.85.106. service: com.hmall.apidubbo.client.ItemClient, method: queryItemByIds, exception: java.lang.NullPointerException: null, dubbo version: 3.3.0, current host: 10.44.85.106, error code: 5-36. This may be caused by , go to https://dubbo.apache.org/faq/5/36 to find instructions. java.lang.NullPointerException: null at com.hmall.itemdubbo.controller.ItemDubbo.queryItemByIds(ItemDubbo.java:25) ~[classes/:na] at com.hmall.itemdubbo.controller.ItemDubboDubboWrap0.invokeMethod(ItemDubboDubboWrap0.java) ~[classes/:na] at org.apache.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:89) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:100) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:55) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:56) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ClassLoaderCallbackFilter.invoke(ClassLoaderCallbackFilter.java:38) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.HttpContextCallbackFilter.invoke(HttpContextCallbackFilter.java:37) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.rest.filter.RestFilterAdapter.invoke(RestFilterAdapter.java:38) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at com.alibaba.dubbo.rpc.Invoker$CompatibleInvoker.invoke(Invoker.java:77) ~[dubbo-3.3.0.jar:3.3.0] at io.seata.integration.dubbo.alibaba.AlibabaDubboTransactionPropagationFilter.invoke(AlibabaDubboTransactionPropagationFilter.java:45) ~[seata-all-2.0.0.jar:2.0.0] at com.alibaba.dubbo.rpc.Filter.invoke(Filter.java:34) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at com.hmall.commondubbo.filter.UserInfoDubboFilter.invoke(UserInfoDubboFilter.java:40) ~[classes/:na] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:80) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:45) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.seata.SeataTransactionPropagationProviderFilter.invoke(SeataTransactionPropagationProviderFilter.java:66) ~[dubbo-filter-seata-1.0.2.jar:1.0.2] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:109) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:55) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.AccessLogFilter.invoke(AccessLogFilter.java:120) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:222) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.HttpContextFilter.invoke(HttpContextFilter.java:50) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:54) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:41) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.metrics.filter.MetricsFilter.invoke(MetricsFilter.java:86) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.metrics.filter.MetricsProviderFilter.invoke(MetricsProviderFilter.java:37) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ProfilerServerFilter.invoke(ProfilerServerFilter.java:66) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:191) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CopyOfFilterChainNode.invoke(FilterChainBuilder.java:349) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.cluster.filter.FilterChainBuilder$CallbackRegistrationInvoker.invoke(FilterChainBuilder.java:197) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerCallListener.invoke(AbstractServerCallListener.java:69) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.UnaryServerCallListener.onComplete(UnaryServerCallListener.java:50) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener$Http2StreamingDecodeListener.onClose(GenericHttp2ServerTransportListener.java:201) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.DefaultListeningDecoder.close(DefaultListeningDecoder.java:47) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.StreamingDecoder$DefaultFragmentListener.onClose(StreamingDecoder.java:60) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.LengthFieldStreamingDecoder.deliver(LengthFieldStreamingDecoder.java:135) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.remoting.http12.message.LengthFieldStreamingDecoder.close(LengthFieldStreamingDecoder.java:81) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener.onDataCompletion(GenericHttp2ServerTransportListener.java:143) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.http2.GenericHttp2ServerTransportListener.onDataCompletion(GenericHttp2ServerTransportListener.java:49) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.doOnData(AbstractServerTransportListener.java:187) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.rpc.protocol.tri.h12.AbstractServerTransportListener.lambda$onData$1(AbstractServerTransportListener.java:171) ~[dubbo-3.3.0.jar:3.3.0] at org.apache.dubbo.common.threadpool.serial.SerializingExecutor.run(SerializingExecutor.java:105) ~[dubbo-3.3.0.jar:3.3.0] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na] at org.apache.dubbo.common.threadlocal.InternalRunnable.run(InternalRunnable.java:39) ~[dubbo-3.3.0.jar:3.3.0] at java.base/java.lang.Thread.run(Thread.java:829) ~[na:na] 以上是一个后端工程项目的两个模块的错误日志,分析错误并给出解决方法。
08-11
从日志中可以看出,项目在执行过程中出现了两个关键错误: 1. **主错误**:在`queryMyCarts`方法中调用`queryItemByIds`时发生了`NullPointerException`。 - 根本原因:`ItemDubbo.queryItemByIds()`方法第25行尝试访问一个空对象的属性或方法。 - 关键日志: ``` ERROR ... Got unchecked and undeclared exception ... NullPointerException at com.hmall.itemdubbo.controller.ItemDubbo.queryItemByIds(ItemDubbo.java:25) ``` 2. **次级错误**:`ItemClient`的远程调用也抛出了相同的`NullPointerException`,说明服务提供方存在同样的问题。 --- ### 解决方案 #### 1. 修复空指针问题(核心) 在`ItemDubbo.queryItemByIds()`方法中: ```java // 修改前(可能代码) public List<ItemDTO> queryItemByIds(List<Long> ids) { // 第25行附近可能直接操作未判空的参数或返回结果 return ids.stream() .map(id -> itemMapper.selectById(id).toDTO()) // 若selectById返回null则抛NPE .collect(Collectors.toList()); } // 修改建议 public List<ItemDTO> queryItemByIds(List<Long> ids) { if (ids == null) return Collections.emptyList(); return ids.stream() .filter(Objects::nonNull) .map(id -> { Item item = itemMapper.selectById(id); return item != null ? item.toDTO() : null; }) .filter(Objects::nonNull) .collect(Collectors.toList()); } ``` #### 2. 服务调用容错处理 在`CartControllerImpl.queryMyCarts()`中增加对下游服务的容错: ```java try { List<ItemDTO> items = itemClient.queryItemByIds(cartItemIds); // 处理items为null的情况 } catch (Exception e) { log.error("调用商品服务失败", e); // 返回部分数据或默认值 } ``` #### 3. 防御性编程建议 - 所有Dubbo接口参数添加`@NotNull`校验 - 使用Optional避免NPE: ```java Optional.ofNullable(itemMapper.selectById(id)) .map(Item::toDTO) .orElse(null); ``` #### 4. 依赖检查 确认以下内容: 1. `itemMapper`是否被正确注入(非null) 2. 数据库查询`selectById()`是否可能返回null(需要处理) 3. Dubbo服务提供方和消费方的接口版本是否一致 --- ### 相关问题 1. 如何配置Dubbo的降级策略避免服务调用失败导致整个请求失败? 2. 在微服务架构中,如何设计更健壮的异常处理机制(如熔断、重试)? 3. 如何通过日志分析定位Dubbo服务间的级联故障? 4. 参数校验框架(如Hibernate Validator)在Dubbo服务中的最佳实践是什么? 5. 如何实现Dubbo服务的单元测试覆盖这类空指针异常场景?
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