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一尘不染

Tomcat 8.0不会以纯Spring MVC模板开始

tomcat

我已经Spring MVC project template使用STS 3.7.3和创建了一个模板jdk 1.8。

我在Pivotal tc Server Developer Edition提供的上运行生成的代码STS 3.7.3。服务器已启动，应用程序已部署，并显示Hello world页面。

但是，当我添加tomcat 8.0服务器（在没有任何已部署应用程序的情况下成功启动）并开始部署完全相同的应用程序时，我得到：

SEVERE: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/core]]
    at java.util.concurrent.FutureTask.report(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    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(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/core]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:153)
    ... 6 more
Caused by: java.lang.NullPointerException
    at org.apache.jasper.servlet.TldScanner$TldScannerCallback.scanWebInfClasses(TldScanner.java:401)
    at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:208)
    at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262)
    at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:106)
    at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:103)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5261)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
    ... 6 more

maj 25, 2016 2:36:25 PM org.apache.catalina.core.ContainerBase startInternal
SEVERE: 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(Unknown Source)
    at java.util.concurrent.FutureTask.get(Unknown Source)
    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(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    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(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
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

maj 25, 2016 2:36:25 PM org.apache.catalina.startup.Catalina start
SEVERE: 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(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    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

maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-nio-8080"]
maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-nio-8009"]
maj 25, 2016 2:36:25 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["http-nio-8080"]
maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol destroy
SEVERE: 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(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)

maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["ajp-nio-8009"]
maj 25, 2016 2:36:25 PM org.apache.coyote.AbstractProtocol destroy
SEVERE: 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(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)

从我看来，问题可能与版本问题有关servlet- api.jar，pom.xml但是我认为添加scope:provided应该可以解决问题（事实并非如此）。

谁能给我一个提示我做错了什么？


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2020-06-16

共1个答案

一尘不染

此堆栈跟踪的相关部分是：

Caused by: java.lang.NullPointerException
    at org.apache.jasper.servlet.TldScanner$TldScannerCallback.scanWebInfClasses(TldScanner.java:401)
    at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:208)
    at org.apache.jasper.servlet.TldScanner.scanJars(TldScanner.java:262)
    at org.apache.jasper.servlet.TldScanner.scan(TldScanner.java:106)
    at org.apache.jasper.servlet.JasperInitializer.onStartup(JasperInitializer.java:103)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5261)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
    ... 6 more

Tomcat
8.0.35（2016年5月16日发布）中引入了一个错误
-
TldScannerCallback.scanWebInfClasses方法已更改为依赖于该getResourcePaths方法。它已在Tomcat
8.0.36（2016年6月9日发布）中修复。

如果它可以帮助其他人找到答案，我只是在从Tomcat 8.0.32进行次要版本升级到8.0.35（Amazon
EC2实例今天早上推送了8.0.35更新）之后才遇到此问题。以我为例，自从Tomcat 5被此更新破坏以来，一个无需修改即可运行的Web应用程序。

使用上述错误报告中的建议，我能够解决该问题。具体来说，一个空WEB-INF/classes/META- INF文件夹正在触发此错误，因此我在该文件夹中创建了MANIFEST.MF文件。

这里是提交所引入的错误，而这里犯的是固定的bug，在提交者是指它作为一个“
罕见的NPE的情况下
”，知道是什么意思（意味着文件夹很少空？）。在阅读了提交中的注释之后，很明显，这是一种抑制工作代码中的FindBugs报告的黑客，进而产生了破坏Web应用程序的实际错误。

2020-06-16