Tag Archives: ● Various problems encountered

JS error: unexpected token u in JSON at position 0

At first glance, this error is confusing, but it is simply due to json.parse parsing of undefined.

JSON.parse is used somewhere, but the argument passed in is not a qualified JSON string.
Parse parse parse parse parse parse parse parse parse parse
Parse before you judge
 

Come from:
https://www.cnblogs.com/yangxunwu1992/p/8964780.html

Error: (serious: a child container failed during start) (server component failed to start so Tomcat is unable)

A child container failed during start

hint: A child container failed during start is never the root cause of the problem. Look at Caused by.

The required Server component failed to start so Tomcat is unable to start.

tip: check the web.xml file, it should be and or tag mismatch, not exactly match, check the configuration file.

solution:

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complete error message: 

严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/shiro]]
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:915)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
	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:748)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/shiro]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
	... 6 more
Caused by: java.lang.IllegalArgumentException: Servlet mapping specifies an unknown servlet name mvc-dispatcher
	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3180)
	at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3159)
	at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1376)
	at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1184)
	at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
	at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:306)
	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:5202)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	... 6 more

八月 03, 2018 6:36:29 下午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
	at java.util.concurrent.FutureTask.report(FutureTask.java:122)
	at java.util.concurrent.FutureTask.get(FutureTask.java:192)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:915)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:441)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:787)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:629)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
	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:748)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:923)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:871)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	... 6 more

八月 03, 2018 6:36:29 下午 org.apache.catalina.startup.Catalina start
严重: The required Server component failed to start so Tomcat is unable to start.
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:629)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:787)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:441)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:923)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
	... 11 more

八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-nio-8080"]
八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-nio-8009"]
八月 03, 2018 6:36:29 下午 org.apache.catalina.core.StandardService stopInternal
信息: Stopping service Catalina
八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["http-nio-8080"]
八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol destroy
严重: Failed to destroy end point associated with ProtocolHandler ["http-nio-8080"]
java.lang.NullPointerException
	at org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:316)
	at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:492)
	at org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:821)
	at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:534)
	at org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1023)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:589)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:877)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:633)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)

八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["ajp-nio-8009"]
八月 03, 2018 6:36:29 下午 org.apache.coyote.AbstractProtocol destroy
严重: Failed to destroy end point associated with ProtocolHandler ["ajp-nio-8009"]
java.lang.NullPointerException
	at org.apache.tomcat.util.net.NioEndpoint.releaseCaches(NioEndpoint.java:316)
	at org.apache.tomcat.util.net.NioEndpoint.unbind(NioEndpoint.java:492)
	at org.apache.tomcat.util.net.AbstractEndpoint.destroy(AbstractEndpoint.java:821)
	at org.apache.coyote.AbstractProtocol.destroy(AbstractProtocol.java:534)
	at org.apache.catalina.connector.Connector.destroyInternal(Connector.java:1023)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.core.StandardService.destroyInternal(StandardService.java:589)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.core.StandardServer.destroyInternal(StandardServer.java:877)
	at org.apache.catalina.util.LifecycleBase.destroy(LifecycleBase.java:297)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:633)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)