新人报道,想请教各路大神一个EmbedTomcat7(内嵌版本)启动问题

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新人报道,想请教各路大神一个EmbedTomcat7(内嵌版本)启动问题15

场景描述: 为工作中需要, 我这边负责将原有项目(例如:Project)引入一个内嵌的Tomcat,实现目标:Project.war可以放在Tomcat/Was等容器中运行,也可以在一台只安装有JDK的机器上通过脚本运行; 所以我这边计划引入EmbedTomcat7来实现,首先在apache的官网下载了apache-tomcat-7.0.54-embed,并在Project的WEB-INF下面新建EmbedServer目录,引入了启动的配置文件(conf目录)和jar包(lib目录);写了War包的启动类(Main.java)和Tomcat启动类(EmbeddedTomcat.java),在Main.java中,首先将war解压到指定目录,然后通过自定义URLClassLoader装载EmbeddedTomcat来启动EmbedTomcat服务;

问题描述: 在调用EmbeddedTomcat时,我这边用自定义URLClassLoader来装载EmbeddedTomcat.class和所需要的jar包,代码如下:

//设置classpath
URL classUrl= new File("D:/Proj/Proj/WEB-INF/classes").toURL() ;

//EmbedTomcat依赖Jar包 这里省略其他jar...
URL jarFile1 = new File("D:/Proj/Proj/WEB-INF/embedded-runtime/lib/tomcat-embed-core.jar").toURL();
URL jarFile2 = new File("D:/Proj/Proj/WEB-INF/embedded-runtime/lib/ecj-P20140317-1600.jar").toURL();
URLClassLoader urlClassLoader=new URLClassLoader(new URL[]{classUrl,jarFile1,jarFile2....},originalContextCL);

//设置到当前线程
currThread.setContextClassLoader(urlClassLoader);
Class invoked_class = urlClassLoader.loadClass("com.server.EmbeddedTomcat");

//设置参数param_types和method_params 省略...
Method main = invoked_class.getDeclaredMethod("main", param_types);
//启动服务
main.invoke(invoked_class.newInstance(), method_params);

问题来了,我在Eclipse中对Main进行run as Application 是可以正常运行,但是通过脚本(启动脚本:java -DDEBUG -XX:PermSize=512m -Xmx512m -jar Project.war start )运行war文件却有如下错误:

2014-7-9 18:05:51 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-bio-8080"]
2014-7-9 18:05:51 org.apache.catalina.core.StandardService startInternal
信息: Starting service Tomcat
2014-7-9 18:05:51 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.54
2014-7-9 18:05:51 org.apache.catalina.startup.ContextConfig getDefaultWebXmlFragment
信息: No global web.xml found
2014-7-9 18:05:51 org.apache.tomcat.util.digester.Digester endElement
严重: End event threw exception
java.lang.ClassNotFoundException: org.apache.catalina.deploy.ServletDef
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720)
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
        at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:846)
        at org.apache.tomcat.util.digester.SetNextRule.end(SetNextRule.java:201)
        at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1063)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1774)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2930)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
        at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1812)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1250)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:876)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:374)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5355)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
        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:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
2014-7-9 18:05:51 org.apache.catalina.startup.ContextConfig parseWebXml
严重: Parse error in application web.xml file at jndi:/localhost/Proj/WEB-INF/web.xml
java.lang.ClassNotFoundException: org.apache.catalina.deploy.ServletDef
        at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2711)
        at org.apache.tomcat.util.digester.Digester.createSAXException(Digester.java:2743)
        at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1066)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1774)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2930)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
        at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1561)
        at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1812)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1250)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:876)
        at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:374)
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
        at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5355)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
        at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
        at java.util.concurrent.FutureTask.run(FutureTask.java:138)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
2014-7-9 18:05:51 org.apache.catalina.startup.ContextConfig parseWebXml
严重: Occurred at line 25 column 12
2014-7-9 18:05:51 org.apache.catalina.startup.ContextConfig configureStart
严重: Marking this application unavailable due to previous error(s)
2014-7-9 18:05:51 org.apache.catalina.core.StandardContext startInternal
严重: Error getConfigured
2014-7-9 18:05:51 org.apache.catalina.core.StandardContext startInternal
严重: Context [/Proj] startup failed due to previous errors
2014-7-9 18:05:51 org.apache.catalina.loader.WebappClassLoader clearReferencesJd
bc
警告: JDBC driver de-registration failed for web application [/Proj]
java.lang.NullPointerException
        at org.apache.catalina.loader.WebappClassLoader.clearReferencesJdbc(WebappClassLoader.java:2071)
        at org.apache.catalina.loader.WebappClassLoader.clearReferences(WebappClassLoader.java:2007)
        at org.apache.catalina.loader.WebappClassLoader.stop(WebappClassLoader.java:1908)
        at org.apache.catalina.loader.WebappLoader.stopInternal(WebappLoader.java:661)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at org.apache.catalina.core.StandardContext.stopInternal(StandardContext.java:5702)
        at org.apache.catalina.util.LifecycleBase.stop(LifecycleBase.java:232)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:160)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
        at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
        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:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)
2014-7-9 18:05:51 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-bio-8080"]

我想主要是由于EmbeddedTomcat7所依赖的JAR包没有正常加载而引起的,如果将这些jar包放到jre/ext中便可以正常启动,也可以在解压后的目录中写一个bat脚本 -cp classpath 启动, 但总感觉不是一个优雅的做法,所以想请问各路大神,如何从根本上去除上述启动错误?是否有更加方便的处理方式? 顺便普及一下Tomcat的装载及运行原理, 万分感谢!

问题补充：我尝试过将EmbedTomcat依赖的Jar和EmbeddedTomcat.class打到一个jar中, 结果还是同样的错误,难道真的无解了???

问题补充：目前只能通过bat脚本解决了, 读取参数 → 效验目录 → 解压war包 → 设置classPath → 启动server 不甘心啊