I set breakpoint in line 31 of itemSelect.jsp file. when the jsp was called, I got in "Source not found for itemSelection.jsp line: 31 " error in "_jspService" tab under debug perspective.

but "itemSelection.jsp" file tab is the same window of "_jspService" tab.

Environment:
Elipse
Version: 3.1.0
MyElipse:
4.0.0GA
OS: windows XP
Java
1.5.0_05-b05

Error
Thread [http-8080-Processor21] (Suspended)
itemSelection.jsp line: 31
itemSelection_jsp(HttpJspBase).service(HttpServletRequest, HttpServletResponse) line: 94
itemSelection_jsp(HttpServlet).service(ServletRequest, ServletResponse) line: 802
JspServletWrapper.service(HttpServletRequest, HttpServletResponse, boolean) line: 324
JspServlet.serviceJspFile(HttpServletRequest, HttpServletResponse, String, Throwable, boolean) line: 292
JspServlet.service(HttpServletRequest, HttpServletResponse) line: 236
JspServlet(HttpServlet).service(ServletRequest, ServletResponse) line: 802
ApplicationFilterChain.internalDoFilter(ServletRequest, ServletResponse) line: 237
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 157
ApplicationDispatcher.invoke(ServletRequest, ServletResponse) line: 704
ApplicationDispatcher.doInclude(ServletRequest, ServletResponse) line: 590
ApplicationDispatcher.include(ServletRequest, ServletResponse) line: 510
JspRuntimeLibrary.include(ServletRequest, ServletResponse, String, JspWriter, boolean) line: 966
PageContextImpl.include(String) line: 581
InsertJspTag.doEndTag() line: 71
template4.jsp line: not available
template4.jsp line: not available
template4_jsp(HttpJspBase).service(HttpServletRequest, HttpServletResponse) line: 94
template4_jsp(HttpServlet).service(ServletRequest, ServletResponse) line: 802
JspServletWrapper.service(HttpServletRequest, HttpServletResponse, boolean) line: 324
JspServlet.serviceJspFile(HttpServletRequest, HttpServletResponse, String, Throwable, boolean) line: 292
JspServlet.service(HttpServletRequest, HttpServletResponse) line: 236
JspServlet(HttpServlet).service(ServletRequest, ServletResponse) line: 802
ApplicationFilterChain.internalDoFilter(ServletRequest, ServletResponse) line: 237
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 157
ApplicationDispatcher.invoke(ServletRequest, ServletResponse) line: 704
ApplicationDispatcher.processRequest(ServletRequest, ServletResponse) line: 474
ApplicationDispatcher.doForward(ServletRequest, ServletResponse) line: 409
ApplicationDispatcher.forward(ServletRequest, ServletResponse) line: 312
LeanMainServlet(MainServlet).doGet(HttpServletRequest, HttpServletResponse) line: 369
LeanMainServlet.doGet(HttpServletRequest, HttpServletResponse) line: 134
LeanMainServlet(HttpServlet).service(HttpServletRequest, HttpServletResponse) line: 689
LeanMainServlet(HttpServlet).service(ServletRequest, ServletResponse) line: 802
ApplicationFilterChain.internalDoFilter(ServletRequest, ServletResponse) line: 237
ApplicationFilterChain.doFilter(ServletRequest, ServletResponse) line: 157
StandardWrapperValve.invoke(Request, Response, ValveContext) line: 214
StandardValveContext.invokeNext(Request, Response) line: 104
StandardPipeline.invoke(Request, Response) line: 520
StandardContextValve.invokeInternal(Wrapper, Request, Response) line: 198
StandardContextValve.invoke(Request, Response, ValveContext) line: 152
StandardValveContext.invokeNext(Request, Response) line: 104
NonLoginAuthenticator(AuthenticatorBase).invoke(Request, Response, ValveContext) line: 462
StandardValveContext.invokeNext(Request, Response) line: 102
StandardPipeline.invoke(Request, Response) line: 520
StandardHostValve.invoke(Request, Response, ValveContext) line: 137
StandardValveContext.invokeNext(Request, Response) line: 104
ErrorReportValve.invoke(Request, Response, ValveContext) line: 118
StandardValveContext.invokeNext(Request, Response) line: 102
StandardPipeline.invoke(Request, Response) line: 520
StandardEngineValve.invoke(Request, Response, ValveContext) line: 109
StandardValveContext.invokeNext(Request, Response) line: 104
StandardPipeline.invoke(Request, Response) line: 520
StandardEngine(ContainerBase).invoke(Request, Response) line: 929
CoyoteAdapter.service(Request, Response) line: 160
Http11Processor.process(InputStream, OutputStream) line: 799
Http11Protocol$Http11ConnectionHandler.processConnection(TcpConnection, Object[]) line: 705
TcpWorkerThread.runIt(Object[]) line: 577
ThreadPool$ControlRunnable.run() line: 683
ThreadWithAttributes(Thread).run() line: not available

Have you tried stopping Tomcat, removing your deployment, rebuilding/cleaning your project and redeploying?