我试图从数据库中检索数据.当我运行程序它显示错误
java.lang.ClassNotFoundException：org.apache.commons.lang.exception.NestableRuntimeException我有json-lib jar文件在我的WEB-INF – > lib目录,我不知道为什么它显示
JSONArray的这个错误.
我的代码是：
- StringBuilder sb=new StringBuilder(1024);
- sb.append("select * from ").append(uname.trim()).append("vcomments").append(" where itemid=").append(itemId).append(" and albumid=").append(albumId);
- sql=sb.toString();
- stmt = conn.prepareStatement(sql);
- ResultSet rs = stmt.executeQuery();
- //ArrayList<String> CommArray=new ArrayList();
- JSONArray arrayObj=new JSONArray(); //#100
- while(rs.next()){
- Commenter comment = new Commenter();
- comment.setUname(rs.getString("uname").trim());
- comment.setComment(rs.getString("comments").trim());
- arrayObj.add(comment.toString());
- }
- commentObj=gson.toJsonTree(arrayObj);
- myObj.add("commentInfo",commentObj);
- out.println(myObj.toString());
- rs.close();
- stmt.close();
- stmt = null;
- conn.close();
- conn = null;
- }
控制台的输出是：
- SEVERE: Servlet.service() for servlet [VComment] in context with path [/skypark] threw exception [Servlet execution threw an exception] with root cause
- java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException
- at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
- at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
- at java.lang.ClassLoader.defineClass1(Native Method)
- at java.lang.ClassLoader.defineClass(Unknown Source)
- at java.security.SecureClassLoader.defineClass(Unknown Source)
- at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2904)
- at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1173)
- at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1681)
- at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
- at skypark.VComment.doGet(VComment.java:100)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
- at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
- at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:931)
- at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
- at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
- at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
- at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
- at java.lang.Thread.run(Unknown Source)
请有人告诉我如何解决这个问题……谢谢….
解决方法
我有同样的问题,和你一样 – 我下载了最新的commons-lang.但实际上我可以通过下载
apache commons-lang 2.6(
DDL)并将该jar放在WEB-INF / lib下来解决
希望你在此期间解决了这个问题.
