1

我导入了net.sf.json包以在我的jsp apge中使用JSON的功能，但是一旦我创建了 JSONArray 的对象，它就会抛出NoClassDefinitionFound。

//line 50
JSONObject responcedata=new JSONObject();


exception thrown is:
org.apache.jasper.JasperException: An exception occurred processing JSP page /jqgriddata.jsp at line 50


48: 
49: 
50:         JSONObject responcedata=new JSONObject();
51:         JSONArray cellarray=new JSONArray();
52: 
53:   //      responcedata.put("total",totalrow);


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:510)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:401)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause

javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class net.sf.json.JSONObject
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:862)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:791)
    org.apache.jsp.jqgriddata_jsp._jspService(jqgriddata_jsp.java:191)
    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:377)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause

java.lang.NoClassDefFoundError: Could not initialize class net.sf.json.JSONObject
    org.apache.jsp.jqgriddata_jsp._jspService(jqgriddata_jsp.java:100)
    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:377)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:

260）javax.servlet.http.HttpServlet.service（HttpServlet.java:717）

4

1 回答 1

4

它只是告诉 webapp 的运行时类路径中缺少提到的类。您需要下载net.sf.json并删除文件夹中包含包类的 JAR 文件/WEB-INF/lib（如果需要，不要忘记对其依赖项也执行相同的操作）。

与具体问题无关：在 JSP 文件中编写 Java 代码是一种糟糕的做法。阅读 Roseindia.net 教程也是一个非常糟糕的主意，因为它们只显示了不好的做法。

于 2011-12-27T14:06:08.620 回答