Web app root system property already set to different value
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当tomcat发布多个web项目时候,会抛出异常,解决办法:
在启动出现错误的工程web.xml增加如下语句便可:
<context-param><param-name>webAppRootKey</param-name><param-value> app.root </param-value></context-param>原因如下:
webAppRootKey是在java web项目的web.xml配置文件中表示项目的唯一标示,在Eclipse调试Web项目时,项目的路径是一个临时路径,不在真正的路径下,可以通过log4j日志的方式打印出属性值,来看看临时项目路径在哪里,可以用System.getProperty("web.sample.root");如果web.xm 内没有设置webAppRootKey项,是为默认设置,那么webAppRootKey就是缺省的"webapp.root"。
下面是相关源码
1. · public static void setWebAppRootSystemProperty(ServletContext servletContext) throws IllegalStateException {2. String param = servletContext.getInitParameter(WEB_APP_ROOT_KEY_PARAM);3. String key = (param != null ? param : DEFAULT_WEB_APP_ROOT_KEY);4. String oldValue = System .getProperty(key);5. if (oldValue != null ) {6. throw new IllegalStateException ("WARNING: Web app root system property already set: " + key + " = " +7. 8. 9. oldValue + " - Choose unique webAppRootKey values in your web.xml files!" );10. }11. String root = servletContext.getRealPath("/" );12. if (root == null ) {13. throw new IllegalStateException ("Cannot set web app root system property when WAR file is not 14. 15. expanded");16. }17. System .setProperty(key, root);18. servletContext.log("Set web app root system property: " + key + " = " + root);19. }从代码看出,该方法其实就是把该web application的根目录的绝对文件路径作为属性保存在 System的属性列表中。该属性的名字,由web.xml文件中的名为"webAppRootKey"的参数值指出。如果不在web.xml中定义 webAppRootKey参数,那么属性名就是缺省的"webapp.root".
但最好设置,以免项目之间的名称冲突。
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