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POPostgresql + Hibernate3 + C3p0 = not closing connections
 

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  1. POPostgresql + Hibernate3 + C3p0 = not closing connections
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    <p>This only happens until peak load of the system.</p> <p>Hibernate exception:</p> <pre><code>org.hibernate.exception.JDBCConnectionException: could not execute query </code></pre> <p>org.postgresql.util.PSQLException: An I/O error occured while sending to the backend. java.io.IOException: Stream closed</p> <pre><code>postgresql log entry: 2011-08-10 05:27:35 UTC LOG: unexpected EOF on clien </code></pre> <p>t connection</p> <p>Here is my hibernate xml file</p> <pre><code>&lt;!-- Database connection settings --&gt; &lt;property name="connection.driver_class"&gt;org.postgresql.Driver&lt;/property&gt; &lt;property name="connection.url"&gt;jdbc:postgresql://[url]/sa_server&lt;/property&gt; &lt;property name="connection.username"&gt;[user]&lt;/property&gt; &lt;property name="connection.password"&gt;[pw]&lt;/property&gt; &lt;property name="hibernate.connection.provider_class"&gt;org.hibernate.connection.C3P0ConnectionProvider&lt;/property&gt; &lt;property name="hibernate.c3p0.min_size"&gt;3&lt;/property&gt; &lt;property name="hibernate.c3p0.max_size"&gt;5&lt;/property&gt; &lt;property name="hibernate.c3p0.timeout"&gt;1800&lt;/property&gt; &lt;property name="hibernate.c3p0.idle_test_period"&gt;100&lt;/property&gt; &lt;!-- SQL dialect --&gt; &lt;property name="hibernate.dialect"&gt;org.hibernatespatial.postgis.PostgisDialect&lt;/property&gt; &lt;property name="current_session_context_class"&gt;thread&lt;/property&gt; &lt;!-- Disable the second-level cache --&gt; &lt;property name="cache.provider_class"&gt;org.hibernate.cache.NoCacheProvider&lt;/property&gt; &lt;!-- Echo all executed SQL to stdout --&gt; &lt;property name="show_sql"&gt;false&lt;/property&gt; </code></pre> <p>EDIT----</p> <p>Here is the code I am calling to get and close the session.</p> <pre><code>// perform the operation itself try { session = AppSessionFactory.openSession(); session.beginTransaction(); session.setFlushMode( FlushMode.COMMIT ); if ( pre() ) { if ( doWork() ) { if ( post() ) { session.getTransaction().commit(); } } } if ( !response.success ) { session.getTransaction().rollback(); } } catch ( Exception e ) { if ( session != null ) { try { session.getTransaction().rollback(); } catch ( Exception e2 ) {} } // attempt to retrieve a useful error for the invoker outerException = e; Throwable cause = outerException.getCause(); if ( cause != null &amp;&amp; cause instanceof SQLException ) { Exception rootCause = ((SQLException)cause).getNextException(); if ( rootCause != null ) { innerException = rootCause; } } } finally { if ( session != null ) { session.close(); } } </code></pre> <p>EDIT--</p> <pre><code>public class AppSessionFactory { private static AppSessionFactory instance = null; private final SessionFactory sessionFactory = new Configuration() .configure() // configures settings from hibernate.cfg.xml .buildSessionFactory(); private AppSessionFactory() {} @Override protected void finalize() { if ( sessionFactory != null ) { sessionFactory.close(); } } private static AppSessionFactory instance() { if ( instance == null ) { instance = new AppSessionFactory(); } return instance; } public static Session openSession() { return instance().sessionFactory.openSession(); } </code></pre> <p>}</p>
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    1. COMore iteresting would be how you retrieve and release the session
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      1. USDaniel
    2. COadded appsessionfactory
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