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  1.  Home
  2. JAVA400-L
  3. January 2003

Re: con

This FAQ from the IBM Toolbox for Java and JTOpen web site might help:
http://www-1.ibm.com/servers/eserver/iseries/toolbox/faqjdbc.htm#faqC8


Frances Stewart
WebSphere Application Server for iSeries 400
External: (507) 253-2795
Tie-line: 8-553-2795
IBM Rochester



                                                                                
                                                    
                      P.Goovaerts@Clipper                                       
                                                    
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java400-l@midrange.com                                                   
                      Sent by:                   cc:       web400@midrange.com  
                                                    
                      java400-l-bounces@m        Subject:  con                  
                                                    
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                      01/16/2003 02:34 AM                                       
                                                    
                      Please respond to                                         
                                                    
                      Java Programming on                                       
                                                    
                      and around the                                            
                                                    
                      iSeries / AS400                                           
                                                    
                                                                                
                                                    
                                                                                
                                                    




We have running a webapp which uses 'connection-pooling' to get data from
the iSeries.  From time to time, a selectionbox in a JSP, filled with a
datatable is empty.  The only lead we have is an error in the std_out.log
from WAS4.0.4

This is what we do in short:
Application loaded (basic authentication)
   JSP is loaded
   JSP initializes a databean
   JSP executes a method from the bean
      BEAN gets a connection, using connection-pooling
      BEAN loads a table into a vector
   JSP reads vector into selection-list-box
   JSP is displayed in browser
mostly this works ok but from time to time, the selectionbox is empty...

Any suggestions???

We use WAS V4
We created the application with WSAD V4.  While testing inside WSAD we
didn't encounter any errors.  Then I deployed the application into WAS V4
on Win2000.  Again no errors encountered.  Finally we deployed to WAS V4
on iSeries 270.  At first it worked but then we noticed the problem.

This is the error displayed in log:

[16/01/03 7:54:17:516 UTC] 241eff08 StaleConnecti A CONM7007I: Mapping the
following SQLException, with ErrorCode -99.999 and SQLState 08003, to a
StaleConnectionException: java.sql.SQLException: The connection does not
exist.(Connection was dropped unexpectedly.)
      java/lang/Throwable.<init>(Ljava/lang/String;)V+4
(Throwable.java:90)
      java/lang/Exception.<init>(Ljava/lang/String;)V+1
(Exception.java:38)
 java/sql/SQLException.<init>(Ljava/lang/String;Ljava/lang/String;I)V+1
(SQLException.java:39)

com/ibm/as400/access/JDError.throwSQLException(Ljava/lang/String;Ljava/lang/Exception;)V+0

(JDError.java:317)

com/ibm/as400/access/AS400JDBCConnection.sendAndReceive(Lcom/ibm/as400/access/DBBaseRequestDS;I)Lcom/ibm/as400/access/DBReplyRequestedDS;
+0
(AS400JDBCConnection.java:1846)

com/ibm/as400/access/AS400JDBCStatement.commonExecute(Lcom/ibm/as400/access/JDSQLStatement;Lcom/ibm/as400/access/JDServerRow;)V+0

(AS400JDBCStatement.java:467)

com/ibm/as400/access/AS400JDBCPreparedStatement.executeQuery
()Ljava/sql/ResultSet;+0
(AS400JDBCPreparedStatement.java:827)

com/ibm/ejs/cm/cache/CachedStatement.executeQuery()Ljava/sql/ResultSet;+118

(CachedStatement.java:301)

com/ibm/ejs/cm/proxy/StatementProxy.executeQueryCommon(Ljava/lang/String;Z)Ljava/sql/ResultSet;
+96
(StatementProxy.java:274)

com/ibm/ejs/cm/proxy/PreparedStatementProxy.executeQuery
()Ljava/sql/ResultSet;+1
(PreparedStatementProxy.java:47)

com/clipper/objects/Cigars.getAllCigarTypesPerClient(Ljava/sql/Connection;Ljava/lang/String;)Ljava/util/Vector;
+0
(Cigars.java:284)
      com/clipper/beans/CigarsBean.getCigarTypes(Ljava/lang/String;)V+0
(CigarsBean.java:40)

_CigarStock_jsp_0.
_jspService(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+0

(_CigarStock_jsp_0.java:53)

javax/servlet/http/HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+26

(HttpServlet.java:853)

org/apache/jasper/runtime/JspServlet$JspServletWrapper.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;Z)V+159

(JspServlet.java:312)

org/apache/jasper/runtime/JspServlet.serviceJspFile(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;Ljava/lang/String;Ljava/lang/Throwable;ZLjava/lang/String;)V+92

(JspServlet.java:500)

org/apache/jasper/runtime/JspServlet.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+154

(JspServlet.java:633)

javax/servlet/http/HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+26

(HttpServlet.java:853)

com/ibm/servlet/engine/webapp/StrictServletInstance.doService(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+21

(ServletManager.java:827)

com/ibm/servlet/engine/webapp/StrictLifecycleServlet.
_service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+69

(StrictLifecycleServlet.java:167)

com/ibm/servlet/engine/webapp/ServletInstance.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lcom/ibm/servlet/engine/webapp/WebAppServletInvocationEvent;)V+186

(ServletManager.java:472)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.handleWebAppDispatch(Lcom/ibm/servlet/engine/webapp/WebAppRequest;Ljavax/servlet/http/HttpServletResponse;)V+817

(WebAppRequestDispatcher.java:678)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.dispatch(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Z)V+1080

(WebAppRequestDispatcher.java:331)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.forward(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+85

(WebAppRequestDispatcher.java:117)

com/clipper/expedancigarstock/SLoginUser.doGet(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+0

(SLoginUser.java:53)

com/clipper/expedancigarstock/SLoginUser.doPost(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+0

(SLoginUser.java:426)

javax/servlet/http/HttpServlet.service(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+136

(HttpServlet.java:760)

javax/servlet/http/HttpServlet.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+26

(HttpServlet.java:853)

com/ibm/servlet/engine/webapp/StrictServletInstance.doService(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+21

(ServletManager.java:827)

com/ibm/servlet/engine/webapp/StrictLifecycleServlet.
_service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+69

(StrictLifecycleServlet.java:167)

com/ibm/servlet/engine/webapp/ServletInstance.service(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Lcom/ibm/servlet/engine/webapp/WebAppServletInvocationEvent;)V+186

(ServletManager.java:472)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.handleWebAppDispatch(Lcom/ibm/servlet/engine/webapp/WebAppRequest;Ljavax/servlet/http/HttpServletResponse;)V+817

(WebAppRequestDispatcher.java:678)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.dispatch(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;Z)V+1080

(WebAppRequestDispatcher.java:331)

com/ibm/servlet/engine/webapp/WebAppRequestDispatcher.forward(Ljavax/servlet/ServletRequest;Ljavax/servlet/ServletResponse;)V+85

(WebAppRequestDispatcher.java:117)

com/ibm/servlet/engine/srt/WebAppInvoker.doForward(Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V+234

(WebAppInvoker.java:134)

com/ibm/servlet/engine/srt/WebAppInvoker.handleInvocationHook(Ljava/lang/Object;)V+175

(WebAppInvoker.java:239)

com/ibm/servlet/engine/invocation/CachedInvocation.handleInvocation(Ljava/lang/Object;)V+25

(CachedInvocation.java:67)

com/ibm/servlet/engine/invocation/CacheableInvocationContext.invoke(Ljava/lang/Object;)V+87

(CacheableInvocationContext.java:106)

com/ibm/servlet/engine/srp/ServletRequestProcessor.dispatchByURI(Ljava/lang/String;Lcom/ibm/servlet/engine/srp/ISRPConnection;)V+737

(ServletRequestProcessor.java:154)

com/ibm/servlet/engine/oselistener/OSEListenerDispatcher.service(Lcom/ibm/servlet/engine/oselistener/api/IOSEConnection;)V+104

(OSEListener.java:315)
      com/ibm/servlet/engine/http11/HttpConnection.handleRequest()V+4
(HttpConnection.java:60)
      com/ibm/ws/http/HttpConnection.readAndHandleRequest()V+50
(HttpConnection.java:323)
      com/ibm/ws/http/HttpConnection.run()V+195 (HttpConnection.java:252)
      com/ibm/ws/util/CachedThread.run()V+18 (ThreadPool.java:137)


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