Cannot commit when autoCommit is enabled error

ERROR:
ERROR in createReportTable(): Cannot commit when autoCommit is enabled.
org.postgresql.util.PSQLException: Cannot commit when autoCommit is enabled.
        at org.postgresql.jdbc2.AbstractJdbc2Connection.commit(AbstractJdbc2Connection.java:703)
        at sun.reflect.GeneratedMethodAccessor65.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tomcat.jdbc.pool.ProxyConnection.invoke(ProxyConnection.java:126)
        at org.apache.tomcat.jdbc.pool.JdbcInterceptor.invoke(JdbcInterceptor.java:109)
        at org.apache.tomcat.jdbc.pool.DisposableConnectionFacade.invoke(DisposableConnectionFacade.java:80)
        at $Proxy0.commit(Unknown Source)
        at sun.reflect.GeneratedMethodAccessor65.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.hibernate.jdbc.BorrowedConnectionProxy.invoke(BorrowedConnectionProxy.java:40)
        at $Proxy125.commit(Unknown Source)
        at com.resolution.scheduler.dao.hibernate.SalesPAFNewDaoHibernate.runStorageSQLQuery(SalesPAFNewDaoHibernate.java:219)
        at com.resolution.scheduler.service.impl.SalesPAFNewManagerImpl.runStorageSQLQuery(SalesPAFNewManagerImpl.java:151)

...........AutoCommit status: "+acs);
            conn.setAutoCommit(false);
            java.sql.PreparedStatement st = conn.prepareStatement(sqlQuery);
            results = st.executeUpdate();
            conn.commit();
            conn.setAutoCommit(acs);
            st.close();
        } catch (Exception e) {
            System.err.println("ERROR in runStorageSQLQuery(): " + e.getMessage() + " sqlQuery: "+sqlQuery);
            e.printStackTrace();
        }
        return new Integer(results);
    }