Connection object is getting closed before the stored procedure is complete

Question

Hi Everyone,
I am facing an issue where by the java connection object is closed before the stored procedure it is connected to is complete.
I am not sure if the fault is in SP or Connection pool.
After spending some time, i could able to figure out that the procedure is taking a tad more time for processing as there are over 1000 records in the database tables it is dealing with.
Would that be a potential cause ? or Am i required to handle it in Java only ?
I want to know what could be possible causes for this issue ?
Please Help.
FYI,
The following are the logs which says,
XYZ (Stored Procedure) : Start Time is 1349217771302 Procedure started here
INFO >2012-10-02 18:43:09,935 [ConnectionPool]: Closing connection: DataSource [ABC](684)
INFO >2012-10-02 18:46:03,512 DAO[main]: XYZ : End Time is 1349217963512 Procedure ended here
Thanks in Advance.

Answer 1

Hi ,
Thank you all for your quick response.
Well it's my bad i dint provide you any code to look into thinking that i am dealt with a gen issue and also i am too paranoid to post any code i am dealing with in the forum (i am sorry).
But here is some information for you,
Database : Oracle 10g
Java: 1.5 version
We are using only One connection object for the entire java backend process .
The SP is of over 1000 lines of code which for obvious reasons i can't past it here but this morning i figured out an issue in SP where by a query taking way more than usual time to execute which led to SP's poor performance and also the reason for why it is taking very long time than usual.
This query is a simple SELECT query where it is trying fetch over 2000 records from a table of over 3 million records. The execution time is over 30-40 seconds which is the root cause of SP's poor performance.
When i eliminated this from the logic and ran the query it could able process (inserting huge volume around 5000 records of data) in 1 second instead of 3-4 minutes earlier.
I tried to replicate this issue (which occurred in our production server) in my local system but no luck as there was no connection issue here but only the substantial time difference.
We are using a customized connection pool which is as follows,
I am not sure what's going on here because it seems to be greek and latin to me.
What we are doing in our DAO is we are using method of the below ConnectionPool.getInstance(SCHEMA) to get the connection object.
Looking forward to seeking advice from you on how connection pool in general works.
public class ConnectionPool extends Thread
     private static final ConnectionPool me = new ConnectionPool();
     private Hashtable dataSources = new Hashtable();
     private static final int MIN_TIMEOUT = 0;
     private long timeOut;
     private Hashtable cons = new Hashtable();
     private Hashtable active = new Hashtable();
    private boolean trace = false;
     private ConnectionPool()
          registerDataSources();
          this.timeOut = PropertyManager.getIntProperty("connectionPool.timeOut", MIN_TIMEOUT);
          setName("ConnectionPool");
          setPriority(MIN_PRIORITY);
          if (timeOut > 0)
               start();
     private void registerDataSources()
        dataSources.clear();
          Properties props = System.getProperties();
          String app = props.getProperty("X", "Y");
          for(Enumeration e = props.keys(); e.hasMoreElements();)
               String key = (String) e.nextElement();
               if (key.startsWith(app + ".connectionPool.dataSources.") && key.endsWith(".selector"))
                    String ds = key.substring((app + ".connectionPool.dataSources.").length(), key.length() - ".selector".length());
                    LogManager.logStatus("Registering [" + ds + "] (selector) " +
                              props.getProperty(app + ".connectionPool.dataSources." + ds + ".selector"));
                    dataSources.put(ds,
                         new GenDataSource(
                              ds,
                              props.getProperty(app + ".connectionPool.dataSources." + ds + ".selector")));
                    continue;                    
               if (!key.startsWith(app + ".connectionPool.dataSources.") || !key.endsWith(".server"))
                    continue;
               String ds = key.substring((app + ".connectionPool.dataSources.").length(), key.length() - ".server".length());
               try
                    LogManager.logStatus("Registering [" + ds + "] " +
                              props.getProperty(app + ".connectionPool.dataSources." + ds + ".url"));
                    loadDriver(props.getProperty(app + ".connectionPool.dataSources." + ds + ".driver"));
               catch (Exception se)
                    LogManager.logException(se);
               GenDataSource genDataSource = new GenDataSource(
                         ds,
                         props.getProperty(app + ".connectionPool.dataSources." + ds + ".useMatrix", "false").equals("true"),
                         props.getProperty(app + ".connectionPool.dataSources." + ds + ".server"),
                         props.getProperty(app + ".connectionPool.dataSources." + ds + ".url"),
                         props.getProperty(app + ".connectionPool.dataSources." + ds + ".user"),
                         props.getProperty(app + ".connectionPool.dataSources." + ds + ".password"));
               // Set the schema if schema is defined in settings.xml file
               if (genDataSource != null && props.getProperty(app + ".connectionPool.dataSources." + ds + ".schema") != null ) {
                    genDataSource.setSchema(props.getProperty(app + ".connectionPool.dataSources." + ds + ".schema"));
               dataSources.put(ds, genDataSource);
     public static Connection getConnection(String dataSource) throws SQLException
          GenDataSource ds = (GenDataSource) me.dataSources.get(dataSource);
          if (me.timeOut <= 0)
               if (ds.getSchema() != null )
                    return updateSchema ( ds);
               else
                    return DriverManager.getConnection(ds.url(), ds.user(), ds.password());
          String key = dataSource;
          Stack free;
          GenPooledConnection pc = null;
          synchronized (me)
               if ((free = (Stack) me.cons.get(key)) == null)
                    free = new Stack();
                    me.cons.put(key, free);
               if (!free.empty())
                    pc = (GenPooledConnection) free.pop();
               if (pc == null)
                    if (ds.getSchema() != null )
                         pc = new GenPooledConnection("DataSource [" + key + "]",
                                             updateSchema ( ds), free, me.active, me.timeOut, me.trace);
                    else
                         pc = new GenPooledConnection("DataSource [" + key + "]",
                                   DriverManager.getConnection(ds.url(), ds.user(), ds.password()), free, me.active, me.timeOut, me.trace);
               else
                    pc.touch();
          LogManager.logStatus("Using " + pc);
          me.active.put(pc.id(), pc);
          return pc;
     public void run()
          for(;;)
               try
                    sleep(60 * 1000);
                    synchronized (me) {
                         for(Enumeration e = cons.elements(); e.hasMoreElements();)
                              Stack stack = (Stack) e.nextElement();
                              for (int i = stack.size()-1; i >= 0; i--)
                                   GenPooledConnection pc = (GenPooledConnection) stack.elementAt(i);
                                   if (pc.isExpired())
                                        stack.removeElementAt(i);
               catch (Exception e)
                    GenUtil.reportException(e);
     private static Connection updateSchema ( GenDataSource ds) throws SQLException {
          Connection con = DriverManager.getConnection(ds.url(), ds.user(), ds.password());
          if (ds.getSchema() != null ) {
               String sql = "SET SCHEMA  " + ds.getSchema()+ ";";
               LogManager.logDebugMessage("updating the Schema with sql statement " + sql);
               PreparedStatement ps = con.prepareStatement(sql);
               ps.execute();
               ps.close();
          return con;
}Thanks.
Edited by: EJP on 5/10/2012 14:09: added {noformat}{noformat} tags. Please use them.