无法开始使用apache tomcat

Question

我已经开始学习Servlets，所以我从这里下载了Apachetomcat7.xzip文件(core-> zip)。我将其解压缩到我的目录(D:)，然后将JAVA_HOME系统变量设置为C:\Program Files\Java\jdk1.6.0值(我的计算机运行在windows 7 Home basic上)。

我已经通过startup.bat文件在bin文件夹中启动了服务器。当我尝试访问localhost:8080时，浏览器上总是写着unable to connect。因此，我将端口号更改为9999 in server.xml并重新启动它。它再次表示无法在我的浏览器中连接。当我启动服务器时，它在命令shell上显示了以下内容。有人能帮我解决这个问题并让我的服务器正常工作吗？

通过观察命令shell上的以下内容，我只能找到这一行，它似乎给出了一些问题的指示：Failed to initialize component [Standard Server[8005]].我还是不知道这和那些无法连接的人有什么关系。

Feb 24, 2013 4:58:02 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performanc
e in production environments was not found on the java.library.path: C:\Program
Files\Java\jdk1.6.0\bin;.;C:\Windows\system32;C:\Windows;C:\Windows\system32;C:\
Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\
Program Files\Java\jdk1.6.0\bin
Feb 24, 2013 4:58:02 PM org.apache.catalina.startup.Catalina load
SEVERE: Catalina.start
org.apache.catalina.LifecycleException: Failed to initialize component [Standard
Server[8005]]
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
        at org.apache.catalina.startup.Catalina.load(Catalina.java:633)
        at org.apache.catalina.startup.Catalina.load(Catalina.java:658)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:281)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:455)
Caused by: org.apache.catalina.LifecycleException: Failed to initialize componen
t [StandardService[Catalina]]
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
        at org.apache.catalina.core.StandardServer.initInternal(StandardServer.j
ava:814)
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
        ... 8 more
Caused by: org.apache.catalina.LifecycleException: Failed to initialize componen
t [StandardEngine[Catalina]]
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:106)
        at org.apache.catalina.core.StandardService.initInternal(StandardService
.java:544)
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
        ... 10 more
Caused by: java.lang.NoSuchMethodError: java.util.concurrent.ThreadPoolExecutor.
allowCoreThreadTimeOut(Z)V
        at org.apache.catalina.core.ContainerBase.initInternal(ContainerBase.jav
a:1083)
        at org.apache.catalina.core.StandardEngine.initInternal(StandardEngine.j
ava:283)
        at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)
        ... 12 more
Feb 24, 2013 4:58:02 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 532 ms
Feb 24, 2013 4:58:02 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-bio-9999"]
Feb 24, 2013 4:58:02 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-bio-8009"]
Feb 24, 2013 4:58:02 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
Feb 24, 2013 4:58:03 PM org.apache.catalina.startup.Catalina start
SEVERE: Catalina.start:
org.apache.catalina.LifecycleException: Failed to stop component [StandardServer
[8005]]
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:236)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:141)
        at org.apache.catalina.startup.Catalina.start(Catalina.java:684)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322)
        at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456)
Caused by: org.apache.catalina.LifecycleException: An invalid Lifecycle transiti
on was attempted ([before_stop]) for component [org.apache.catalina.deploy.Namin
gResources@1807ca8] in state [INITIALIZED]
        at org.apache.catalina.util.LifecycleBase.invalidTransition(LifecycleBas
e.java:409)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:219)
        at org.apache.catalina.core.StandardServer.stopInternal(StandardServer.j
ava:756)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        ... 8 more
Feb 24, 2013 4:58:03 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 11 ms

Answer 1

我注意到堆栈跟踪的一件事是：

Caused by: java.lang.NoSuchMethodError: java.util.concurrent.ThreadPoolExecutor.allowCoreThreadTimeOut(Z)V

从ThreadPoolExecutor的Javadoc来看，allowCoreThreatTimeOut(布尔值)方法似乎是在Java6中引入的，它在早期版本中没有出现。如果在过时的JVM上运行针对6+版本的java程序，您会发现上面的错误。

当您第一次开始使用tomcat时，应该有这样的行：

Using CATALINA_BASE:   /home/nick/tools/apache-tomcat-6.0.35
Using CATALINA_HOME:   /home/nick/tools/apache-tomcat-6.0.35
Using CATALINA_TMPDIR: /home/nick/tools/apache-tomcat-6.0.35/temp
Using JRE_HOME:        /usr
Using CLASSPATH:       /home/nick/tools/apache-tomcat-6.0.35/bin/bootstrap.jar

查看JRE_HOME的目录，看看您得到了什么。虽然命令行可以看到Java 6的安装，但是您可能在Tomcat试图使用的某个地方安装了Java 5。安装多个java版本可能会导致混淆。