我正在尝试重新启动 NiFi 并得到以下异常。
2016-04-22 09:27:30,672 WARN [main] org.apache.nifi.web.server.JettyServer Failed to start web server... shutting down.
org.apache.nifi.web.NiFiCoreException: Unable to start Flow Controller.
at org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:99) ~[na:na]
at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:800) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:444) ~[jetty-servlet-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:791) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:294) ~[jetty-servlet-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1349) ~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1342) ~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:741) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:505) ~[jetty-webapp-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.Server.start(Server.java:387) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:61) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.server.Server.doStart(Server.java:354) ~[jetty-server-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) ~[jetty-util-9.2.11.v20150529.jar:9.2.11.v20150529]
at org.apache.nifi.web.server.JettyServer.start(JettyServer.java:663) ~[nifi-jetty-0.5.1.jar:0.5.1]
at org.apache.nifi.NiFi.<init>(NiFi.java:137) [nifi-runtime-0.5.1.jar:0.5.1]
at org.apache.nifi.NiFi.main(NiFi.java:227) [nifi-runtime-0.5.1.jar:0.5.1]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowService': FactoryBean threw exception on object creation; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowController': FactoryBean threw exception on object creation; nested exception is java.lang.RuntimeException: java.io.IOException: Write-Ahead Log located at ./state/local/snapshot was written using the class; cannot restore using org.wali.MinimalLockingWriteAheadLog
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1585) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:317) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1060) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.apache.nifi.web.contextlistener.ApplicationStartupContextListener.contextInitialized(ApplicationStartupContextListener.java:64) ~[na:na]
... 22 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flowController': FactoryBean threw exception on object creation; nested exception is java.lang.RuntimeException: java.io.IOException: Write-Ahead Log located at ./state/local/snapshot was written using the class; cannot restore using org.wali.MinimalLockingWriteAheadLog
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:175) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1585) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:317) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1060) ~[spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.apache.nifi.spring.StandardFlowServiceFactoryBean.getObject(StandardFlowServiceFactoryBean.java:53) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
... 28 common frames omitted
Caused by: java.lang.RuntimeException: java.io.IOException: Write-Ahead Log located at ./state/local/snapshot was written using the class; cannot restore using org.wali.MinimalLockingWriteAheadLog
at org.apache.nifi.controller.FlowController.<init>(FlowController.java:435) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.FlowController.createStandaloneInstance(FlowController.java:364) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.spring.FlowControllerFactoryBean.getObject(FlowControllerFactoryBean.java:66) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:168) ~[spring-beans-4.2.4.RELEASE.jar:4.2.4.RELEASE]
... 35 common frames omitted
Caused by: java.io.IOException: Write-Ahead Log located at ./state/local/snapshot was written using the class; cannot restore using org.wali.MinimalLockingWriteAheadLog
at org.wali.MinimalLockingWriteAheadLog.recoverFromSnapshot(MinimalLockingWriteAheadLog.java:355) ~[nifi-write-ahead-log-0.5.1.jar:0.5.1]
at org.wali.MinimalLockingWriteAheadLog.recoverRecords(MinimalLockingWriteAheadLog.java:292) ~[nifi-write-ahead-log-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.state.providers.local.WriteAheadLocalStateProvider.init(WriteAheadLocalStateProvider.java:99) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.state.providers.AbstractStateProvider.initialize(AbstractStateProvider.java:34) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.state.manager.StandardStateManagerProvider.createStateProvider(StandardStateManagerProvider.java:186) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.state.manager.StandardStateManagerProvider.createLocalStateProvider(StandardStateManagerProvider.java:80) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.state.manager.StandardStateManagerProvider.create(StandardStateManagerProvider.java:66) ~[nifi-framework-core-0.5.1.jar:0.5.1]
at org.apache.nifi.controller.FlowController.<init>(FlowController.java:433) ~[nifi-framework-core-0.5.1.jar:0.5.1]
... 38 common frames omitted
2016-04-22 09:27:30,674 INFO [Thread-1] org.apache.nifi.NiFi Initiating shutdown of Jetty web server...
错误指出它是由位于 ./state/local/snapshot 的预写日志是使用该类编写的;无法使用 org.wali.MinimalLockingWriteAheadLog 恢复
我不确定这是什么意思？
有人可以在这里帮助我吗？
提前谢谢。
这个问题很可能是针对（现在已经很老的）Nifi的0.5版本。
根据@andrew的评论，错误的JDK是主要嫌疑人。
当你运行"java --version"时，你会看到什么？确保它不是GCJ，而是Oracle JDK或OpenJDK，7和8都可以工作。