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From "Ruwan Linton (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (AXIS2-3858) Memory problem. Running DB queries from axis2 service and the java ResultSet object. The bug disappear if I load the garbage collector in my loops.
Date Tue, 04 Jan 2011 05:49:48 GMT

     [ https://issues.apache.org/jira/browse/AXIS2-3858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ruwan Linton resolved AXIS2-3858.
---------------------------------

    Resolution: Not A Problem

This looks like a issue in your service, not an issue in the axis2. I think this is the normal
Java behavior, where the GC runs periodically and if you do not give a chance for the GC to
run it goes out of memory. I am not sure how you got this NPE though. Anyway as this is an
issue in your service implementation this is not an axis2 issue

> Memory problem. Running DB queries from axis2 service and the java ResultSet object.
The bug disappear if I load the garbage collector in my loops.
> ---------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: AXIS2-3858
>                 URL: https://issues.apache.org/jira/browse/AXIS2-3858
>             Project: Axis2
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 1.3
>         Environment: MAC-G4
> OS X 10.4.11
> CPU: PowerPC G4
> 768MB RAM
> Java 1.5.0_13-b05-241
> Eclipse SDK Version: 3.3.2
> Tomcat6 in Eclipse environment (using EclipseTotale plugin)
>            Reporter: Igor Sychev
>            Priority: Critical
>
> Hello!
> I have a question about running DB queries from axis2 v. 1.3 web services using java
ResultSet.
> The bug has a devil complexity, I will be incredibly happy to find a solution.
> Down follows a sources from the test application, this application created only to test
an assumption about the bug.
>  I'm using my class:
> public class ExtResultSet
> {       
>   public ResultSet rs; 
>   public String stateMsg;
>   ...     
> }
> And I execute runtest() method of this class as a service:
> public class DRVtest
> {
>   public  Connection conn;
>   public  Statement stmt;
>   private ExtResultSet ers;
>   public void runtest(int Ini)
>   {
>           ... Connecting stuff ...
>      ers = new ExtResultSet();   // This "new" call is not enought! Why?!
>       for(...)
>                 {
>                 for(...)
>                 {
>                 for(...)
>                 {
>                         StringBuffer seqQuery = new StringBuffer();            
>                         seqQuery.append("SELECT NO_ID FROM RS WHERE ....");
>                         ...
>                         // If I print here:
>                         // new ExtResultSet();
>                         // The problem will disappear!!!
>                         try{
>                                         ers.rs = stmt.executeQuery( seqQuery.toString()
);
>                         }
>                         catch(SQLException e)
>                         { ... }
>                        
>                         int x_no = -1;
>                        
>                         try{
>                                 while( ers.rs.next() )
>                                 {
>                                         x_no = ers.rs.getInt("no_id");
>                                 }
>                          }
>                          catch(SQLException e)
>                          { ... }       
> ...
> First, I had an idea that my JDBC driver for Firebird 1.5 is not stable, I tried to switch
on Postgresql but nothing happened...
> This code newer fails if I execute runtest() as a standard java application ( I tried
on different  java versions and OS ).
> It is obvious, the bug disappear if I load the garbage collector in my loops.
> I'm running Tomcat6 in Eclipse environment (using EclipseTotale plugin) to debug service
thread. 
> The fault messages:
> [ERROR]
> java.lang.NullPointerException
>         at org.apache.axis2.rpc.receivers.RPCInOnlyMessageReceiver.invokeBusinessLogic(RPCInOnlyMessageReceiver.java:83)
>         at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:96)
>         at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:145)
>         at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:275)
>         at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:120)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
>         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
>         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
>         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
>         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
>         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
>         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
>         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
>         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
>         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
>         at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
>         at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
>         at java.lang.Thread.ru

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