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Out of memory error when restarting WildFly on OpenShift

I have a problem with WildFly AS on OpenShift. When I try to deploy a WAR to the server, I keep getting the following exception.

2014-12-20 04:31:33,072 INFO  [org.jboss.as.connector.deployment] (MSC service thread 1-7) JBAS010406: Registered connection factory java:/JmsXA
2014-12-20 04:31:33,444 ERROR [org.hornetq.core.client] (Thread-0 (HornetQ-client-global-threads-32821528)) HQ214017: Caught unexpected Throwable: java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method) [rt.jar:1.8.0_05]
        at java.lang.Thread.start(Thread.java:714) [rt.jar:1.8.0_05]
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950) [rt.jar:1.8.0_05]
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1368) [rt.jar:1.8.0_05]
        at org.hornetq.core.client.impl.ClientSessionFactoryImpl$Channel0Handler.notifyTopologyChange(ClientSessionFactoryImpl.java:1618) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.client.impl.ClientSessionFactoryImpl$Channel0Handler.handlePacket(ClientSessionFactoryImpl.java:1609) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.protocol.core.impl.ChannelImpl.handlePacket(ChannelImpl.java:641) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.protocol.core.impl.RemotingConnectionImpl.doBufferReceived(RemotingConnectionImpl.java:556) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.protocol.core.impl.RemotingConnectionImpl.bufferReceived(RemotingConnectionImpl.java:532) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.client.impl.ClientSessionFactoryImpl$DelegatingBufferHandler.bufferReceived(ClientSessionFactoryImpl.java:1712) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.remoting.impl.invm.InVMConnection$1.run(InVMConnection.java:165) [hornetq-server-2.4.5.Final.jar:]
        at org.hornetq.utils.OrderedExecutorFactory$OrderedExecutor$1.run(OrderedExecutorFactory.java:104) [hornetq-core-client-2.4.5.Final.jar:]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [rt.jar:1.8.0_05]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [rt.jar:1.8.0_05]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_05]

I don't know if its related, but I think the errors started when I added hibernate to my application. Herehibernate.cfg.xml 

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>

        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>   
        <property name="connection.datasource">java:comp/env/jdbc/MyDataSource</property> 
        <property name="hibernate.current_session_context_class">thread</property>

        <!-- GENERAL CONFIGURATION -->
        <property name="connection.pool_size">1</property>
        <property name="hibernate.show_sql">false</property>
        <property name="hibernate.connection.release_mode">after_statement</property>
        <property name="hibernate.connection.autocommit">false</property>
        <property name="hibernate.connection.defaultAutoCommit">false</property>

        <!-- DB MAPING -->

    </session-factory>
</hibernate-configuration>

My HibernateUtil.java

:

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil {
    private static SessionFactory sessionFactory;

    public static SessionFactory getSessionFactory() {

        if (sessionFactory == null) {
            // loads configuration and mappings
            Configuration configuration = new Configuration().configure();
            ServiceRegistry serviceRegistry
                = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties()).build();

            // builds a session factory from the service registry
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);           
        }

        return sessionFactory;
    }
}

And part of my DaoImpl I use to login:

  public User login(String username, String password) {

        User result = null;

        Session session = HibernateUtil.getSessionFactory().openSession();
        try {
            String sql = "select s from User s where username=:username and password=password(:password)";
            Query query = session.createQuery(sql);
            query.setString("username", username);
            query.setString("password", password);
            result = (User) query.uniqueResult();
        }
        finally {
            session.close();
        }

        return result;
    }

I am not 100% getting rid of the hibernate issue because I connected via SSH, deleted everything in wildfly/standalone/deployments/

and restarted the application, but when I execute the command, gear start

I still get the posting error.

2014-12-20 04:46:47,792 WARN  [org.hornetq.core.server] (hornetq-failure-check-thread) HQ222082: error on connection failure check: java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method) [rt.jar:1.8.0_05]
        at java.lang.Thread.start(Thread.java:714) [rt.jar:1.8.0_05]
        at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950) [rt.jar:1.8.0_05]
        at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1357) [rt.jar:1.8.0_05]
        at org.hornetq.utils.OrderedExecutorFactory$OrderedExecutor.execute(OrderedExecutorFactory.java:133) [hornetq-core-client-2.4.5.Final.jar:]
        at org.hornetq.core.remoting.server.impl.RemotingServiceImpl$FailureCheckAndFlushThread.run(RemotingServiceImpl.java:739) [hornetq-server-2.4.5.Final.jar:]

2014-12-20 04:46:48,674 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644)) Exception in thread "Thread-0 (HornetQ-scheduled-threads-30017644)" java.lang.OutOfMemoryError: unable to create new native thread
2014-12-20 04:46:48,675 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.lang.Thread.start0(Native Method)
2014-12-20 04:46:48,675 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.lang.Thread.start(Thread.java:714)
2014-12-20 04:46:48,675 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.util.concurrent.ThreadPoolExecutor.addWorker(ThreadPoolExecutor.java:950)
2014-12-20 04:46:48,676 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.util.concurrent.ThreadPoolExecutor.processWorkerExit(ThreadPoolExecutor.java:1018)
2014-12-20 04:46:48,676 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1160)
2014-12-20 04:46:48,676 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
2014-12-20 04:46:48,677 ERROR [stderr] (Thread-0 (HornetQ-scheduled-threads-30017644))  at java.lang.Thread.run(Thread.java:745)
2014-12-20 04:46:49,675 ERROR [stderr] (Thread-2 (HornetQ-scheduled-threads-30017644)) Exception in thread "Thread-2 (HornetQ-scheduled-threads-30017644)" java.lang.OutOfMemoryError: unable to create new native thread
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2 answers


Small gears have a 250 thread limit, try to limit the number of threads for the messaging service to 50 (or even try 20 depending on the application). The configuration is in the file standalone.xml

.

For example:



<subsystem xmlns="urn:jboss:domain:messaging:2.0">
    <hornetq-server>
        <thread-pool-max-size>50</thread-pool-max-size>
        <scheduled-thread-pool-max-size>50</scheduled-thread-pool-max-size>     

        <!-- ... -->

    </hornetq-server>
</subsystem>

I hope this help.

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Let's open thread .

I found out that I had to disable not only messaging but also clustering. However, after doing this, I ran into OutOfMemoryError

. I have limited the db connection pool. It is unlimited by default.

Unfortunately this was not enough and I also went with



  • managed-slave-services maximum threads 25 -> 15
  • jca: 2.0 threads 50 → 20

However, there is no thread for phpMyAdmin. (Disappointment...

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