报错信息：
java.util.ConcurrentModificationException: nullat java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909) ~[na:1.8.0_171]at java.util.ArrayList$Itr.next(ArrayList.java:859) ~[na:1.8.0_171]at com.ai.rai.group.workflow.service.impl.WorkFlowServiceImpl.getOperAreaInfo(WorkFlowServiceImpl.java:668) ~[classes/:na]at com.ai.rai.group.workflow.service.impl.WorkFlowServiceImpl$$FastClassBySpringCGLIB$$1ed43b54.invoke(<generated>) ~[classes/:na]at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) ~[spring-tx-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673) ~[spring-aop-4.3.14.RELEASE.jar:4.3.14.RELEASE]at com.ai.rai.group.workflow.service.impl.WorkFlowServiceImpl$$EnhancerBySpringCGLIB$$2ce6a219.getOperAreaInfo(<generated>) ~[classes/:na]at com.ai.rai.group.workflow.api.impl.WorkflowApi.getOperInfo(WorkflowApi.java:94) ~[classes/:na]at com.alibaba.dubbo.common.bytecode.Wrapper18.invokeMethod(Wrapper18.java) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:45) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:71) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:48) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:52) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:61) ~[dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java:74) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:41) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:77) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:71) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:131) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:37) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:37) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:102) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:96) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:168) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:50) [dubbo-2.6.1.jar:2.6.1]at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:79) [dubbo-2.6.1.jar:2.6.1]at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_171]at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_171]at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]
代码：
for (TmPositionJob o : lists){if ("终止".equalsIgnoreCase(o.getOperName())){lists.remove(o);}}解决1：
//这个只能用做筛除一个选项的情况for (TmPositionJob o : lists){if ("终止".equalsIgnoreCase(o.getOperName())){lists.remove(o);break;}}解决2：
Iterator<TmPositionJob> iterator = lists.iterator();while(iterator.hasNext()){TmPositionJob o = iterator.next();if("终止".equalsIgnoreCase(o.getOperName()) || "解挂".equalsIgnoreCase(o.getOperName()))iterator.remove(); //注意这个地方}原因是在遍历list的过程中，如果修改了元素，会导致list中索引与对应的值不同，因此抛出异常；
参考文献：https://www.cnblogs.com/snowater/p/8024776.html