XinShepherd opened a new issue, #13504: URL: https://github.com/apache/dubbo/issues/13504
<!-- If you need to report a security issue please visit https://github.com/apache/dubbo/security/policy --> - [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate. ### Environment * Dubbo version: 3.2.7 * Operating System version: Centos7 * Java version: 17 ### Steps to reproduce this issue  ### Expected Behavior No errors <!-- What do you expect from the above steps？--> ### Actual Behavior <!-- What actually happens? --> If there is an exception, please attach the exception trace: ``` org.apache.dubbo.rpc.RpcException: Failed to invoke remote method: getMetadataInfo, provider: dubbo://172.30.73.242:9985/org.apache.dubbo.metadata.MetadataService?connections=1&corethreads=2&dubbo=2.0.2&group=lse-reuter&port=9985&protocol=dubbo&release=3.0.12&retries=0&side=consumer&threadpool=cached&threads=100&timeout=5000&version=1.0.0, cause: Failed to send message Request [id=7828287520875186408, version=2.0.2, twoWay=true, event=false, broken=false, mPayload=0, data=null] to /172.30.73.242:9985, cause: Cannot invoke "Object.equals(Object)" because the return value of "com.alibaba.com.caucho.hessian.io.SerializerFactory.getClassLoader()" is null at org.apache.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:147) at org.apache.dubbo.rpc.protocol.AbstractInvoker.doInvokeAndReturn(AbstractInvoker.java:243) at org.apache.dubbo.rpc.protocol.AbstractInvoker.invoke(AbstractInvoker.java:187) at org.apache.dubbo.rpc.proxy.InvocationUtil.invoke(InvocationUtil.java:61) at org.apache.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:75) at org.apache.dubbo.metadata.MetadataServiceDubboProxy14.getMetadataInfo(MetadataServiceDubboProxy14.java) at org.apache.dubbo.registry.client.metadata.MetadataUtils.getRemoteMetadata(MetadataUtils.java:173) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.lambda$getRemoteMetadata$2(AbstractServiceDiscovery.java:229) at org.apache.dubbo.metrics.event.MetricsEventBus.post(MetricsEventBus.java:86) at org.apache.dubbo.registry.client.AbstractServiceDiscovery.getRemoteMetadata(AbstractServiceDiscovery.java:228) at org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener.lambda$doOnEvent$2(ServiceInstancesChangedListener.java:162) at java.base/java.util.Optional.orElseGet(Optional.java:364) at org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener.doOnEvent(ServiceInstancesChangedListener.java:162) at org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener.onEvent(ServiceInstancesChangedListener.java:116) at org.apache.dubbo.registry.client.event.listener.ServiceInstancesChangedListener$AddressRefreshRetryTask.run(ServiceInstancesChangedListener.java:489) at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539) at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) at java.base/java.lang.Thread.run(Thread.java:833) Caused by: org.apache.dubbo.remoting.RemotingException: Failed to send message Request [id=7828287520875186408, version=2.0.2, twoWay=true, event=false, broken=false, mPayload=0, data=null] to /172.30.73.242:9985, cause: Cannot invoke "Object.equals(Object)" because the return value of "com.alibaba.com.caucho.hessian.io.SerializerFactory.getClassLoader()" is null at org.apache.dubbo.remoting.transport.netty4.NettyChannel.send(NettyChannel.java:226) at org.apache.dubbo.remoting.transport.AbstractClient.send(AbstractClient.java:202) at org.apache.dubbo.remoting.transport.AbstractPeer.send(AbstractPeer.java:53) at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeChannel.request(HeaderExchangeChannel.java:149) at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeClient.request(HeaderExchangeClient.java:105) at org.apache.dubbo.rpc.protocol.dubbo.DubboInvoker.doInvoke(DubboInvoker.java:131) ... 20 common frames omitted Caused by: java.lang.NullPointerException: Cannot invoke "Object.equals(Object)" because the return value of "com.alibaba.com.caucho.hessian.io.SerializerFactory.getClassLoader()" is null at org.apache.dubbo.common.serialize.hessian2.Hessian2FactoryManager.getSerializerFactory(Hessian2FactoryManager.java:49) at org.apache.dubbo.common.serialize.hessian2.Hessian2ObjectOutput.<init>(Hessian2ObjectOutput.java:44) at org.apache.dubbo.common.serialize.hessian2.Hessian2Serialization.serialize(Hessian2Serialization.java:57) at org.apache.dubbo.common.serialize.DefaultSerializationExceptionWrapper.serialize(DefaultSerializationExceptionWrapper.java:51) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encodeRequest(ExchangeCodec.java:269) at org.apache.dubbo.remoting.exchange.codec.ExchangeCodec.encode(ExchangeCodec.java:79) at org.apache.dubbo.rpc.protocol.dubbo.DubboCountCodec.encode(DubboCountCodec.java:51) at org.apache.dubbo.remoting.transport.netty4.NettyChannel.send(NettyChannel.java:192) ... 25 common frames omitted ``` -- This is an automated message from the Apache Git Service. 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