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.
