java项目报错_web项目引用Java项目，连接报错error HTTP Status 500 - Servlet execution threw an exception...
错误信息
项目背景：
一个web项目引用一个java Project，项目中添加了引用，但是打开页面访问，总报500错误。提示：servlet初始化错误。
环境：Eclipse luna
JDK: 1.7
Tomcat: 8.0
HTTP Status 500 - Servlet execution threw an exception
type Exception report
message Servlet execution threw an exception
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NoClassDefFoundError: org/codehaus/jackson/map/ObjectMapper
com.founder.xap.maserver.actionstruct.ActionStructParser.fromJson(ActionStructParser.java:20)
com.founder.xap.maserver.servlet.MAServlet.processRequest(MAServlet.java:63)
com.founder.xap.maserver.servlet.MAServlet.doGet(MAServlet.java:42)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ClassNotFoundException: org.codehaus.jackson.map.ObjectMapper
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1305)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
com.founder.xap.maserver.actionstruct.ActionStructParser.fromJson(ActionStructParser.java:20)
com.founder.xap.maserver.servlet.MAServlet.processRequest(MAServlet.java:63)
com.founder.xap.maserver.servlet.MAServlet.doGet(MAServlet.java:42)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.21 logs.
解决方案：
1、项目属性，java build path --》projects，添加所需的java项目
2、项目属性--》 Java build Path --》 Order and Export勾选java项目
3、项目属性--》Deployment Assemby 添加所依赖的Java项目
