JAVA + Postgres Limit connections , how to close it ! FATAL: sorry, too many clients already

Question

I need to release connection to postgres

My java application interact with postgres and my problem is when i need to call this function more than 200 time postgres crashes , normal thing ... because postgres have limited connections and this script leave a connection opened everytime it execute.

@Override
    public Object[] getExtrasInfosSource(int idSource) {
    StringBuffer sql = new StringBuffer();
        final SessionFactoryImplementor sfi = (SessionFactoryImplementor) getSessionFactory();
        final Settings settings = sfi.getSettings();
        // Appel du procedure stocké "getExtrasInfosForSource(idSource integer)" au niveau de bd
        sql.append("SELECT * from "+settings.getDefaultSchemaName()+".getExtras_Infos_For_Source(:idSource)");
        SQLQuery query = this.getSession().createSQLQuery(sql.toString());
        query.setInteger("idSource", idSource);
        return (Object[]) query.setMaxResults(1).uniqueResult();...

Can you please tell me how to close the connection opened in postgres from this script to avoid the app crash everytime postgres connections is over loaded.

Answer 1

According to Hibernate's javadocs you can call .close() on a session.

close()

End the session by releasing the JDBC connection and cleaning up.

Before returning your query results: this.getSession().close();

Answer 2

I have solved this issue by adding those variables to my server config , it refresh the IDLE connections (or so) opened left in postgresql

<?xml version="1.0" encoding="utf-8"?>
<Context>
    <Resource name="jdbc/database"
              auth="Container"
              type="javax.sql.DataSource"
              driverClassName="org.postgresql.Driver"
              url="jdbc:postgresql://localhost:5432/DBA"
              username="DBA"
              password="DBA"
              initialSize="34"
              maxActive="80"
              maxIdle="5"

              timeBetweenEvictionRunsMillis="1000"
              minEvictableIdleTimeMillis="2000"
              validationQuery="SELECT 1"
              validationInterval="3000"
              testOnBorrow="true"
              removeAbandoned="true"
              removeAbandonedTimeout="3"/>  

</Context>