javax.servlet.ServletException: java.lang.NoClassDefFoundError:

最新推荐文章于 2021-10-21 20:15:36 发布

TokgoLiang

最新推荐文章于 2021-10-21 20:15:36 发布

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分类专栏：错误笔记 java 文章标签： java poi web

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错误笔记

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博主使用Apache POI将Word转换为HTML时，在独立Java类中运行正常，但集成到Web应用中时出现ClassNotFoundException。原因是Tomcat WEB-INF/lib目录缺少必要的POI库。

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楼主使用Apache POI把word转成HTML，是遇到一个问题；

同一个项目里面单独使用test.java调用POI可以吧word转成HTML，但是放到action中或者在JSP文件里面调用是就会出错

type Exception report

message javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/poi/hwpf/converter/PicturesManager

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

exception

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/poi/hwpf/converter/PicturesManager
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

javax.servlet.ServletException: java.lang.NoClassDefFoundError: org/apache/poi/hwpf/converter/PicturesManager
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:905)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:834)
org.apache.jsp.test_jsp._jspService(test_jsp.java:107)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NoClassDefFoundError: org/apache/poi/hwpf/converter/PicturesManager
org.apache.jsp.test_jsp._jspService(test_jsp.java:95)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.ClassNotFoundException: org.apache.poi.hwpf.converter.PicturesManager
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1333)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1180)
org.apache.jsp.test_jsp._jspService(test_jsp.java:95)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:403)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:347)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
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/8.0.8 logs.

错误的原因其实是：org/apache/poi/hwpf/converter/PicturesManager所在的jar包虽然build path,

但是Tomcat8.0\webapps\项目名\WEB-INF\lib文件夹下面没有对应jar包（原因楼主也不懂）
解决方法：把对应的包拷贝到Tomcat8.0\webapps\项目名\WEB-INF\lib