Tomcat启动报`org.jaxen.util.AncestorAxisIterator`和`org.jaxen.util.AncestorOrSelfAxisIterator`循环依赖问题

Question

tomcat在日常启动时候突然爆出了这个错误，爆出org.jaxen.util.AncestorAxisIterator类和org.jaxen.util.AncestorOrSelfAxisIterator循环依赖的问题

严重: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:753)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:587)
        at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1798)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Unable to complete the scan for annotations for web application [] due to a StackOverflowError. Possible root causes include a too low setting for -Xss and illegal cyclic inheritance dependencies. The class hierarchy being processed was [org.jaxen.util.AncestorAxisIterator->org.jaxen.util.AncestorOrSelfAxisIterator->org.jaxen.util.AncestorAxisIterator]
        at org.apache.catalina.startup.ContextConfig.checkHandlesTypes(ContextConfig.java:2108)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2054)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsJar(ContextConfig.java:1999)
        at org.apache.catalina.startup.ContextConfig.processAnnotationsUrl(ContextConfig.java:1969)
        at org.apache.catalina.startup.ContextConfig.processAnnotations(ContextConfig.java:1923)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1166)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:783)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:307)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:95)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5213)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
        ... 10 more

Answer 1

看看是不是Jaxen包和dom4j冲突了
Jaxen包和dom4j包在使用时候有些依赖关系，如果必须同时引入两个包的话，要注意两者相互的版本关系，如果版本不对应可能会导致上述的循环依赖问题。目前本人亲测，Jaxen-1.1.6和dom4j-1.6.1这两个版本搭配不会有循环依赖的问题出现。