莫名其缪的问题，急死了

Question

我用struts+hibernate+weblogic作项目开发，在queryAction总是出现weblogic报错，如下：<2006-4-16 下午03时19分10秒 CST> <Error> <HTTP> <BEA-101020> <[ServletContext(id=11548716,name=bookonline,context-path=/bookonline)] Se
rvlet failed with Exception
java.util.NoSuchElementException
        at java.util.AbstractList$Itr.next()Ljava/lang/Object;(AbstractList.java:426)
        at jsp_servlet.__initial._jspService(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(__initia
l.java:503)
        at weblogic.servlet.jsp.JspBase.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(JspBase.java:33)
        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(ServletStubImpl.java:1072)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblog
ic/servlet/internal/FilterChainImpl;)V(ServletStubImpl.java:465)
        at weblogic.servlet.internal.TailFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/Fi
lterChain;)V(TailFilter.java:28)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCha
inImpl.java:27)
        at com.dong.bookstore.struts.EncodingFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servle
t/FilterChain;)V(EncodingFilter.java:93)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCha
inImpl.java:27)
        at weblogic.servlet.internal.RequestDispatcherImpl.forward(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Requ
estDispatcherImpl.java:326)
        at org.apache.struts.action.RequestProcessor.doForward(Ljava/lang/String;Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/
http/HttpServletResponse;)V(RequestProcessor.java:1063)
        at org.apache.struts.action.RequestProcessor.processForwardConfig(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/Ht
tpServletResponse;Lorg/apache/struts/config/ForwardConfig;)V(RequestProcessor.java:386)
        at org.apache.struts.action.RequestProcessor.process(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResp
onse;)V(RequestProcessor.java:229)
        at org.apache.struts.action.ActionServlet.process(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletRespons
e;)V(ActionServlet.java:1194)
        at org.apache.struts.action.ActionServlet.doPost(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse
;)V(ActionServlet.java:432)
        at javax.servlet.http.HttpServlet.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(Htt
pServlet.java:760)
        at javax.servlet.http.HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(HttpServlet.java:853)        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(ServletStubImpl.java:1072)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblog
ic/servlet/internal/FilterChainImpl;)V(ServletStubImpl.java:465)
        at weblogic.servlet.internal.TailFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/Fi
lterChain;)V(TailFilter.java:28)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCha
inImpl.java:27)
        at com.dong.bookstore.struts.EncodingFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servle
t/FilterChain;)V(EncodingFilter.java:93)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCha
inImpl.java:27)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava/lang/Object;(WebAppServletContext.java:698
7)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic/security/subject/AbstractSubject;Ljava/security/Privilege
dAction;)Ljava/lang/Object;(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl/
internal/AuthenticatedSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(SecurityManager.java:121)
        at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic/servlet/internal/ServletRequestImpl;Lweblogic/servlet
/internal/ServletResponseImpl;)V(WebAppServletContext.java:3892)
        at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic/kernel/ExecuteThread;)V(ServletRequestImpl.java:2766)
        at weblogic.kernel.ExecuteThread.execute(Lweblogic/kernel/ExecuteRequest;)V(ExecuteThread.java:224)
        at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:183)
        at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread;)V(Unknown Source)
>我QueryAction代码如下：public ActionForward execute(
ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) {
QueryForm queryForm = (QueryForm) form;

String key = queryForm.getKey();
int pageno = queryForm.getPageno();
BookDAO book=null;
Pager pager = null;
int pagesize = 20;

if (pageno==0)
{
pageno = 1;
}
try{
book = new BookDAO();
book.setPageno(pageno);
book.setPagesize(pagesize);
pager = book.findBookByName(key);
// for(;pager.getIt().hasNext();){
// System.out.println(((Book)pager.getIt().next()).getName());
// }
HttpSession session = request.getSession(false);
session.setAttribute("pager",pager);


return (mapping.findForward("success"));
}}我的流程是：queryBook.jsp(查询）---〉queryAction（处理及获取相应数据）---〉返回到queryBook.jsp郁闷死了，一直搞不定，请大家帮想象办法呀。

Answer 1

你提供的信息不够，至少还要Pager、BookDAO类的代码，现在只能大概估计错误在你的pager.getIt()或 BookDAO.findBookByName(arg）中

Answer 2

BookDAO.findBookByName(arg）中代码如下：public class BookDAO extends AbstractQuery {

public Pager findBookByName(String name) throws HibernateException{
     int totalRows = 0;
    
     java.util.List result;
        try {
         //get sum that accord with query condition
        totalRows = this.getTotalRows("select count(*) from Book where name like '" + name + "%'");
         //excute page query
       Query query = SessionUtil.currentSession().createQuery("from Book where name like :name");
        query.setString("name",name+"%");
         setQueryPage(query);
       List result = query.list();
        return new Pager(result.iterator(),totalRows);
         }
        catch(HibernateException e){
         throw e;
        }
        finally{
         SessionUtil.closeSession();
}
       
    }pager.java如下；
public class Pager implements Serializable{

private int totalRows;
private Iterator it;

public Pager(Iterator it,int totalRows){

this.it = it;
this.totalRows = totalRows;
} public Iterator getIt() {
return it;
} public void setIt(Iterator it) {
this.it = it;
} public int getTotalRows() {
return totalRows;
} public void setTotalRows(int totalRows) {
this.totalRows = totalRows;
}

}其实在queryAction中我已经测试过了，可以获取到所需要的数据，但好像问题是出在return (mapping.findForward("success"));由于考虑到乱码问题，我用了一个过滤器类，但在上面的报错中说我这个类中也有问题，到底是什么问题，煎熬中。望继续给与帮助。

Answer 3

刚刚又有新发现，页面也可以出现预期的结果了，但是weblogic控制台中还是出现上面错误：
<2006-4-16 下午11时08分51秒 CST> <Error> <HTTP> <BEA-101020> <[ServletContext(id=11971285,name=bookonline,context-path=/bookonline)] S
rvlet failed with Exception
java.util.NoSuchElementException
        at java.util.AbstractList$Itr.next()Ljava/lang/Object;(AbstractList.java:426)
        at jsp_servlet.__initial._jspService(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(__initi
l.java:503)
        at weblogic.servlet.jsp.JspBase.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(JspBase.java:33)
        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(ServletStubImpl.java:1072)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblo
ic/servlet/internal/FilterChainImpl;)V(ServletStubImpl.java:465)
        at weblogic.servlet.internal.TailFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/F
lterChain;)V(TailFilter.java:28)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCh
inImpl.java:27)
        at com.dong.bookstore.struts.EncodingFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servl
t/FilterChain;)V(EncodingFilter.java:93)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCh
inImpl.java:27)
        at weblogic.servlet.internal.RequestDispatcherImpl.forward(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(Req
estDispatcherImpl.java:326)
        at org.apache.struts.action.RequestProcessor.doForward(Ljava/lang/String;Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet
http/HttpServletResponse;)V(RequestProcessor.java:1063)
        at org.apache.struts.action.RequestProcessor.processForwardConfig(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/H
tpServletResponse;Lorg/apache/struts/config/ForwardConfig;)V(RequestProcessor.java:386)
        at org.apache.struts.action.RequestProcessor.process(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletRes
onse;)V(RequestProcessor.java:229)
        at org.apache.struts.action.ActionServlet.process(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletRespon
e;)V(ActionServlet.java:1194)
        at org.apache.struts.action.ActionServlet.doPost(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletRespons
;)V(ActionServlet.java:432)
        at javax.servlet.http.HttpServlet.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V(Ht
pServlet.java:760)
        at javax.servlet.http.HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(HttpServlet.java:853        at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run()Ljava/lang/Object;(ServletStubImpl.java:1072)
        at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lweblo
ic/servlet/internal/FilterChainImpl;)V(ServletStubImpl.java:465)
        at weblogic.servlet.internal.TailFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servlet/F
lterChain;)V(TailFilter.java:28)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCh
inImpl.java:27)
        at com.dong.bookstore.struts.EncodingFilter.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Ljavax/servl
t/FilterChain;)V(EncodingFilter.java:93)
        at weblogic.servlet.internal.FilterChainImpl.doFilter(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V(FilterCh
inImpl.java:27)
        at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run()Ljava/lang/Object;(WebAppServletContext.java:69
7)
        at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Lweblogic/security/subject/AbstractSubject;Ljava/security/Privileg
dAction;)Ljava/lang/Object;(AuthenticatedSubject.java:321)
        at weblogic.security.service.SecurityManager.runAs(Lweblogic/security/acl/internal/AuthenticatedSubject;Lweblogic/security/acl
internal/AuthenticatedSubject;Ljava/security/PrivilegedAction;)Ljava/lang/Object;(SecurityManager.java:121)
        at weblogic.servlet.internal.WebAppServletContext.invokeServlet(Lweblogic/servlet/internal/ServletRequestImpl;Lweblogic/servle
/internal/ServletResponseImpl;)V(WebAppServletContext.java:3892)
        at weblogic.servlet.internal.ServletRequestImpl.execute(Lweblogic/kernel/ExecuteThread;)V(ServletRequestImpl.java:2766)
        at weblogic.kernel.ExecuteThread.execute(Lweblogic/kernel/ExecuteRequest;)V(ExecuteThread.java:224)
        at weblogic.kernel.ExecuteThread.run()V(ExecuteThread.java:183)
        at java.lang.Thread.startThreadFromVM(Ljava/lang/Thread;)V(Unknown Source)