在Apache Tomcat上部署WAR文件-不起作用

Question

I implemented an API in Java using Eclipse and exported it in the form of a war file. It is working fine on the system I developed it on.

This is the web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>Favorite-API</display-name>
  <servlet>
    <servlet-name>Favorite-API</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
      <param-name>com.sun.jersey.config.property.packages</param-name>
      <param-value>favorite.api</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Favorite-API</servlet-name>
    <url-pattern>/rest-videos/*</url-pattern>
  </servlet-mapping>
</web-app>

Now I want to deploy the API on another system. Hence I took the war file and deployed it on the Apache Tomcat server of the other machine, following the steps given here .

But on running the API I am getting the following error:

HTTP Status 500 -   
________________________________


type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: Servlet.init() for servlet Favorite-API threw exception
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
  org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
  org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
  org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
  org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
  java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
  java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  java.lang.Thread.run(Unknown Source)


root cause 

java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor
  com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:79)
  com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
  com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
  com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
  com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
  com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
  com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:205)
  com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:376)
  com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:559)
  javax.servlet.GenericServlet.init(GenericServlet.java:160)
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
  org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
  org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
  org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
  org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
  java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
  java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  java.lang.Thread.run(Unknown Source)


root cause 

java.lang.ClassNotFoundException: org.objectweb.asm.ClassVisitor
  org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1711)
  org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1556)
  com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:79)
  com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
  com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
  com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
  com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
  com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
  com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:205)
  com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:376)
  com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:559)
  javax.servlet.GenericServlet.init(GenericServlet.java:160)
  org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
  org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
  org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
  org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
  org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
  org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
  org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
  java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
  java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
  java.lang.Thread.run(Unknown Source)


note The full stack trace of the root cause is available in the Apache Tomcat/7.0.27 logs.

What is going wrong? Any help please.

Answer 1

You might have some dependencies missing in your class path.

java.lang.NoClassDefFoundError: org/objectweb/asm/ClassVisitor

Assume your development tomcat has this class/package but not in the tomcat which you are trying to deploy the war.

Answer 2

class def not found for servlet means something servlet api that is regularly available to tomcat is now missing for some reason. Possibly the jar file in tomcat's lib folder (maybe other jar files in the tomcat lib folder) have become corrupted or removed. Both have happened to me at times, bad virtual machine to work on, failed disk, or a maven based build process that would deploy additional api to the lib folder and delete things in there before copying the new lib files.

Answer 3

似乎您在$ TOMCAT_HOME / lib目录中缺少ObjectWeb ASM工件。

Answer 4

It sounds like the tomcat use does not have permissions to unpack the WAR file into relevant directories, which means the application itself cannot find required classes.

Ensure that Tomcat can write to the temp, work and webapps folder, and their subdirectories.