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POIs there a limit for maximum number of concurrent transactions in Hibernate?
 

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  1. POIs there a limit for maximum number of concurrent transactions in Hibernate?
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    <p>I've a client that sends 3 requests to a Service Layer which uses Hibernate.</p> <p>Each single request causes Hibernate to begin a transaction (<code>session.beginTransaction()</code>).</p> <p>I find that, <strong>sometimes</strong>, one transaction (from the 2+ running concurrent transactions) fails with <code>createQuery is not valid without active transaction</code>.</p> <p>Here's Hibernate configurations that I use (running in Tomcat 6.0.x and OC4j 10.1.3.4):</p> <pre><code>&lt;property name="hibernate.connection.pool_size"&gt;5&lt;/property&gt; &lt;!-- &lt;property name="hibernate.current_session_context_class"&gt;thread&lt;/property&gt; --&gt; &lt;property name="hibernate.current_session_context_class"&gt;org.hibernate.context.ThreadLocalSessionContext&lt;/property&gt; &lt;property name="connection.autoReconnect"&gt;true&lt;/property&gt; &lt;property name="connection.autoReconnectForPools"&gt;true&lt;/property&gt; &lt;property name="connection.is-connection-validation-required"&gt;true&lt;/property&gt; &lt;property name="hibernate.show_sql"&gt;true&lt;/property&gt; &lt;property name="hibernate.format_sql"&gt;false&lt;/property&gt; &lt;!-- auto commit --&gt; &lt;!-- &lt;property name="connection.autocommit"&gt;true&lt;/property&gt; --&gt; &lt;!-- configuration pool via c3p0 --&gt; &lt;property name="c3p0.idleConnectionTestPeriod"&gt;1000&lt;/property&gt; &lt;property name="c3p0.initialPoolSize"&gt;5&lt;/property&gt; &lt;property name="c3p0.maxPoolSize"&gt;10&lt;/property&gt; &lt;property name="c3p0.maxIdleTime"&gt;1&lt;/property&gt; &lt;property name="c3p0.maxStatements"&gt;30&lt;/property&gt; &lt;property name="c3p0.minPoolSize"&gt;1&lt;/property&gt; &lt;property name="cache.use_query_cache"&gt;true&lt;/property&gt; &lt;property name="cache.provider_class"&gt;org.hibernate.cache.EhCacheProvider&lt;/property&gt; &lt;property name="cache.use_second_level_cache"&gt;true&lt;/property&gt; </code></pre> <p>EDIT: I am using the following Proxy to manage all transactions:</p> <pre><code>import java.lang.reflect.Field; import java.lang.reflect.InvocationHandler; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.lang.reflect.Proxy; import java.util.HashMap; import java.util.Map; import java.util.logging.Logger; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.Transaction; /** * http://stackoverflow.com/questions/2587702 * * @author mohammad_abdullah */ public class ServiceProxy implements InvocationHandler { private Object object; private Logger logger = Logger.getLogger(this.getClass().getSimpleName()); private static final String SESSION_FIELD = "session"; public static final Map&lt;Long, Transaction&gt; ACTIVE_TRANSACTIONS = new HashMap&lt;Long, Transaction&gt;(); private ServiceProxy(Object object) { this.object = object; } public static Object newInstance(Object object) { return Proxy.newProxyInstance(object.getClass().getClassLoader(), object.getClass().getInterfaces(), new ServiceProxy(object)); } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { Object result = null; Session session = null; boolean joined = false; try { if (Modifier.isPublic(method.getModifiers())) { session = HibernateUtil.getSessionFactory().getCurrentSession(); Field sessionField = object.getClass().getSuperclass().getDeclaredField(SESSION_FIELD); if (sessionField == null) throw new UPSAdminException("Service Implementation should have field named: \"" + SESSION_FIELD + "\"."); sessionField.setAccessible(true); sessionField.set(object, session); if (session.getTransaction().isActive()) { joined = true; logger.info("Using Already Active transaction" + " Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); ACTIVE_TRANSACTIONS.put(Thread.currentThread().getId(), session.getTransaction()); } else { logger.info("Transaction Began" + " Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); Transaction newTnx = session.beginTransaction(); ACTIVE_TRANSACTIONS.put(Thread.currentThread().getId(), newTnx); } result = method.invoke(object, args); if (!joined) { ACTIVE_TRANSACTIONS.get(Thread.currentThread().getId()).commit(); ACTIVE_TRANSACTIONS.remove(Thread.currentThread().getId()); logger.info("Transaction Commited" + " Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); } } else { result = method.invoke(object, args); } return result; } catch (InvocationTargetException _ex) { Throwable cause = _ex.getCause(); logger.severe("Caller Exception: " + cause + " Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); if (!joined &amp;&amp; session != null &amp;&amp; session.getTransaction().isActive()) { ACTIVE_TRANSACTIONS.get(Thread.currentThread().getId()).rollback(); ACTIVE_TRANSACTIONS.remove(Thread.currentThread().getId()); } if (cause instanceof HibernateException) { logger.severe("Hibernate Error. Rollbacked Back. Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); throw new DBException(cause.getCause().getMessage()); } else if (cause instanceof SetRollbackException) { logger.severe("Transaction marked for Rollback. Rollbacked Back. Method: " + method.getName() + " Thread: " + Thread.currentThread().getId()); return result; } else { logger.severe("Error in Business Method : " + method + ". Rollbacked Back." + " Thread: " + Thread.currentThread().getId()); throw cause; } } catch (Exception ex) { logger.severe("Error in Proxy code :" + ex + " Method :" + method + " Thread: " + Thread.currentThread().getId()); if (!joined &amp;&amp; session != null &amp;&amp; session.getTransaction().isActive()) { ACTIVE_TRANSACTIONS.get(Thread.currentThread().getId()).rollback(); ACTIVE_TRANSACTIONS.remove(Thread.currentThread().getId()); } if (ex instanceof HibernateException) throw new DBException(ex.getCause().getMessage()); throw ex; } } } </code></pre>
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    1. USBenjamin
    1. USMuhammad Hewedy
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    1. COdo you start a transaction before the **createQuery** method? Does the error always come at the same place or not?
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      1. POIs there a limit for maximum number of concurrent transactions in Hibernate?
      1. USManuPK
    2. COYes I do. mm, really unpredictable.
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      1. POIs there a limit for maximum number of concurrent transactions in Hibernate?
      1. USMuhammad Hewedy
 

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