使用tomcat5.5.34 访问servlet提示500错误web.xml 配置如下<?xml version="1.0" encoding="ISO-8859-1"?><web-app xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4"> <servlet>
<servlet-name>HW</servlet-name>
<servlet-class>HelloWorldServlet</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>HW</servlet-name>
<url-pattern>/asd</url-pattern>
</servlet-mapping></web-app>
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
version="2.4"> <servlet>
<servlet-name>HW</servlet-name>
<servlet-class>HelloWorldServlet</servlet-class>
</servlet> <servlet-mapping>
<servlet-name>HW</servlet-name>
<url-pattern>/asd</url-pattern>
</servlet-mapping></web-app>
解决方案 »
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这个类是没有包的么?
写在包里的话要写成<servlet-class>[package-name].HelloWorldServlet</servlet-class>
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:843)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:679)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1303)
java.lang.Thread.run(Thread.java:595)
root cause java.lang.UnsupportedClassVersionError: Bad version number in .class file (unable to load class HelloWorldServlet)
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1964)
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:933)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1405)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1284)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:843)
org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:679)
org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1303)
java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.34 logs.
--------------------------------------------------------------------------------Apache Tomcat/5.5.34