错误 500 java.lang.NoClassDefFoundError: com/lowagie/text/pdf/FontMapper
在制作报表过程中，以pdf格式打印时出现的错误：
HTTP Status 500 -
type Exception report
message
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: com/lowagie/text/pdf/FontMapperorg.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:398)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
root cause
javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/lowagie/text/pdf/FontMapperorg.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:852)org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)org.apache.jsp.html.page.report.report_jsp._jspService(report_jsp.java:126)org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)javax.servlet.http.HttpServlet.service(HttpServlet.java:717)org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:389)org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)出现此问题的原因:
原来是我导的包有问题，如下：
jasperreports-3.5.3.jar?? ---> iText-2.1.0.jar? 才是正确的
iText-2.1.0.jar ---> com.lowagie
?
iText-5.0.6.jar ---> com.itextpdf.text?
?
所以在用jasperreports-3.5.3.jar时，不能用iText-5.0.6.jar
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1 楼 yuanandyy 2012-10-15 谢谢，帮了大忙啊