java Tomcat6如何选择部署WAR文件的顺序

Question

我有一套web应用程序，部署为许多WAR文件。我已将此代码部署到多个虚拟机上，并且运行良好。我的devops团队创建了一个新的虚拟机，它基本上是其他虚拟机的副本，其中一个web应用在启动时抛出异常。错误如下所示。在比较环境时，我注意到有错误的VM以不同于其他服务器的顺序部署应用程序。我想可能有什么。我如何强制tomcat以指定的顺序部署webapps，而在其他VM上恰好是字母顺序

为了进一步的启发，我们正在使用Jenkins来构建和部署代码，所以我100%确信，同样的代码和库在几乎相同的Linux/Tomcat环境中运行良好

Feb 27, 2014 8:33:03 AM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 395 ms
Feb 27, 2014 8:33:03 AM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Feb 27, 2014 8:33:03 AM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.37
Feb 27, 2014 8:33:03 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive appmgmt20.war
Feb 27, 2014 8:33:05 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive ROOT.war
Feb 27, 2014 8:33:06 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive appmgmt10.war
Feb 27, 2014 8:33:07 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive lbprobe.war
Feb 27, 2014 8:33:07 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive travel.war
2014-02-27 08:33:08 ERROR ContextLoader:227 - Context initialization failed
org.springframework.beans.factory.BeanDefinitionStoreException: Parser configuration exception parsing XML from ServletContext resource [/WEB-INF/classes/edu/cornell/finsys/webservices.xml]; nested exception is javax.xml.parsers.ParserConfigurationException: Unable to validate using XSD: Your JAXP provider [oracle.xml.jaxp.JXDocumentBuilderFactory@10987197] does not support XML Schema. Are you running on Java 1.4 with Apache Crimson? Upgrade to Apache Xerces (or Java 1.5) for full XSD support.
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:404)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
    at 
    ....
Feb 27, 2014 8:33:08 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Feb 27, 2014 8:33:08 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/travel] startup failed due to previous errors
Feb 27, 2014 8:33:08 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive cashreceipts.war
Feb 27, 2014 8:33:09 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive jems.war
Feb 27, 2014 8:33:09 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive paymentrequest.war
Feb 27, 2014 8:33:09 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive acctmgmt.war
Feb 27, 2014 8:33:09 AM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive appmgmtbulkldr.war
Feb 27, 2014 8:33:10 AM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "com.sun.faces.config.ConfigureListener" is already configured for this context. The   duplicate definition has been ignored.
Feb 27, 2014 8:33:10 AM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on localhost/127.0.0.1:8108
Feb 27, 2014 8:33:10 AM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/65  config=null
Feb 27, 2014 8:33:10 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 6897 ms

Answer 1

不幸的是，没有这样的事情，因为Tomcat从来都不支持部署命令

There is no expected startup order. Neither the Servlet spec nor Tomcat define one. You can't rely on the apps starting in any particular order.

无论如何，在服务器上指定部署顺序是一种潜在的解决方法。xml文件。请从Tomcat Wiki上阅读以下内容以了解详细信息：http://wiki.apache.org/tomcat/FAQ/Miscellaneous#Q27

另一种方法是使用Zeroconf作为发现点的服务注册，但这对于所有应用程序来说都会改变

Answer 2

事实证明，我的类加载器是个骗人的东西。我需要添加以下VM参数

-Djavax.xml.parsers.DocumentBuilderFactory=com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl 
-Djavax.xml.parsers.SAXParserFactory=com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl

我在另一个堆栈溢出问题上找到了这个解决方案：Parser configuration exception parsing XML from class path resource