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POIssue with DB pool
 

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  1. POIssue with DB pool
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    <p>I am using DB pool (<a href="http://www.snaq.net/java/DBPool/" rel="nofollow">DB Pool</a>) in my application. My DAO code is like:</p> <pre><code>static { try { PropertyUtil propertyUtil = new PropertyUtil(); propertyUtil.getBundle(Constants.DB_PROPERTIES); String dburl = propertyUtil.getProperty("dburl"); String dbuserName = propertyUtil.getProperty("dbuserName"); String dbpassword = propertyUtil.getProperty("dbpassword"); String dbclass = propertyUtil.getProperty("dbclass"); String dbpoolName = propertyUtil.getProperty("dbpoolName"); int dbminPool = Integer.parseInt(propertyUtil .getProperty("dbminPool")); int dbmaxPool = Integer.parseInt(propertyUtil .getProperty("dbmaxPool")); int dbmaxSize = Integer.parseInt(propertyUtil .getProperty("dbmaxSize")); Class.forName(dbclass).newInstance(); moPool = new ConnectionPool(dbpoolName, dbminPool, dbmaxPool, dbmaxSize, dburl, dbuserName, dbpassword); moLogWrapper.info("Connection pool size: -"+Integer.valueOf(moPool.getSize())); } catch (ApplicationException aoAppEx) { moLogWrapper .error(aoAppEx.getMessage(), aoAppEx.fillInStackTrace()); new ApplicationException(aoAppEx.getMessage(), aoAppEx.fillInStackTrace()); } catch (IllegalAccessException aoIllEx) { moLogWrapper .error(aoIllEx.getMessage(), aoIllEx.fillInStackTrace()); new ApplicationException(aoIllEx.getMessage(), aoIllEx.fillInStackTrace()); } catch (ClassNotFoundException aoCnfEx) { moLogWrapper .error(aoCnfEx.getMessage(), aoCnfEx.fillInStackTrace()); new ApplicationException(aoCnfEx.getMessage(), aoCnfEx.fillInStackTrace()); } catch (InstantiationException aoIEx) { moLogWrapper.error(aoIEx.getMessage(), aoIEx.fillInStackTrace()); new ApplicationException(aoIEx.getMessage(), aoIEx.fillInStackTrace()); } } </code></pre> <p>and my openConnection() method is :</p> <pre><code>public void openConnection() throws ApplicationException { moLogWrapper.info("inside openConnection method"); try { loCon = moPool.getConnection(); // moLogWrapper.info(moPool.getSize()); } catch (SQLException aoSqlEx) { moLogWrapper .error(aoSqlEx.getMessage(), aoSqlEx.fillInStackTrace()); if (null != loCon) { loCon = null; } throw new ApplicationException(1002, aoSqlEx); } catch (Exception aoEx) { moLogWrapper.error(aoEx.fillInStackTrace()); throw new ApplicationException(aoEx.getMessage(), aoEx.fillInStackTrace()); } moLogWrapper.info("exiting openConnection method"); } </code></pre> <p>The problem is that I am getting null in .openConnection method from Connection pool class. There is a DEBUG log printed in my logs as well, which prints following line:</p> <pre><code>[snaq.db.ConnectionPool.sp] sp: Checkout - 10/10 (HitRate=40.186916%) - null returned </code></pre> <p>I am not able to understand why null is being returned and how can i debug the actual issue.</p> <p><strong>Edit:</strong></p> <p>My application runs fine but throws starts throwing this error sometime suddenly.</p> <p>I am using postgres as my database.</p>
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    1. USAnkit
    1. USAnkit
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    1. COCan you please post the full error stacktrace ?
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      1. USShamis Shukoor
    2. COAre there any errors at start up ?
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      1. USSantosh
    3. CO@Santosh: Please see my edit section in the question. The application usually runs fine but starts throwing this error suddenly.
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      1. USAnkit
 

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