RedHat企业版5上的Tomcat servlets问题

Question

我最近(几乎)完成了我正在处理的一份合同的申请，并且正在将当前实例从我的工作计算机移植到生产服务器，以便在我执行dev的最后步骤之前解决任何问题，并且我遇到了一些配置问题。任何帮助都将不胜感激。

我正要ssh进入工作并检查os版本，但显然有人把它关掉了……我认为它要么运行Natty，要么运行Oneiric。生产服务器正在运行Redhat Enterprise 5。

我的桌面(Ubuntu)上的web应用程序是由apache2托管的。它是一个带有代理的网页，通过AJP将流量路由到同一台计算机上的tomcat6实例。此代理仅受到从网页发起的AJAX请求的影响。

我要将此应用程序移植到已安装tomcat的Red Hat实例。RELEASE-NOTES表示其版本为7.0.23。在我使用我的webapp之前，我想测试一下tomcat的功能。我在webapps/中创建了一个虚拟的webapp文件夹，并在其中创建了一个index.html文件，并尝试通过web浏览器进行连接，但没有成功。

启动tomcat会产生以下日志记录：

Apr 19, 2013 5:38:22 AM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/lib/jvm/java-\
1.6.0-sun-1.6.0.41.x86_64/jre/lib/amd64/server:/usr/lib/jvm/java-1.6.0-sun-1.6.0.41.x86_64/jre/lib/amd64:/usr/lib/jvm/java-1.6.0-sun-1.6.0.41.x86_64/jre/../lib/amd64:/\
usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
Apr 19, 2013 5:38:22 AM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'debug' to '0' did not find a matching property.
Apr 19, 2013 5:38:23 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
Apr 19, 2013 5:38:23 AM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
Apr 19, 2013 5:38:23 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 1364 ms
Apr 19, 2013 5:38:23 AM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
Apr 19, 2013 5:38:23 AM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.23
Apr 19, 2013 5:38:23 AM 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].StandardCo\ntext[]]
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
    at java.util.concurrent.FutureTask.get(FutureTask.java:83)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1100)
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:782)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1525)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1515)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    ... 7 more
Caused by: java.lang.UnsupportedClassVersionError: com/dell/oma/common/OMASessionListener : Unsupported major.minor version 51.0 (unable to load class com.dell.oma.com\mon.OMASessionListener)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2827)             at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1160)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1655)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533)

..。以及其他一些非常类似的失败(子容器)。

下面是我的$TOMCAT/conf/server.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<Server port="8005" shutdown="SHUTDOWN">
<Listener SSLEngine="on" className="org.apache.catalina.core.AprLifecycleListener"/>
<Listener className="org.apache.catalina.core.JasperListener"/>
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener"/>
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener"/>

<GlobalNamingResources>
<Resource auth="Container" description="User database that can be updated and saved" factory="org.apache.catalina.users.MemoryUserDatabaseFactory" name="UserDatabase" pathname="conf/tomcat-users.xml" type="org.apache.catalina.UserDatabase"/>
</GlobalNamingResources>

<Service name="Catalina">
<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443" />

<Connector port="8009" protocol="AJP/1.3" redirectPort="8443"/>

<Engine defaultHost="localhost" name="Catalina">

  <Realm className="org.apache.catalina.realm.LockOutRealm">

    <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase"/>
  </Realm>

  <Host appBase="webapps" autoDeploy="true" name="localhost" unpackWARs="true">

  <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" pattern="%h %l %u %t &quot;%r&quot; %s %b" prefix="localhost_access_log." suffix=".txt"/>

      <Context debug="0" docBase="omsa" path="">
                    <Manager className="org.apache.catalina.session.PersistentManager" saveOnRestart="false"/>
            </Context>
    </Host>
</Engine>
</Service>
</Server>

对于servlet和xml配置，我还是个新手。如果我遗漏了任何必要的信息，请让我知道，我会张贴编辑。感谢大家的帮助。这已经困扰我一两天了。

Answer 1

Java class版本51.0来自java 7。这意味着此戴尔库是为java 7编译的，而您的服务器运行的是java-1.6.0.41。因此，您必须升级服务器上的java版本或重新编译戴尔库。第一种方法似乎更可取，因为从2月份开始不再支持java6。