Hi,

with my RCP program I have the problem that I want to have more than one copy running on my PC. The first instance runs very good. If I start the second instance, everything is fine until I want to access the database.

Using this code:

..    
Map properties = new HashMap();
            properties.put("javax.persistence.jdbc.driver", dbDriver);
            properties.put("javax.persistence.jdbc.url", dbUrl);
            properties.put("javax.persistence.jdbc.user", dbUser);
            properties.put("javax.persistence.jdbc.password", dbPass);
            try {
                factory = Persistence.createEntityManagerFactory(
                        PERSISTENCE_UNIT_NAME, properties);
            } catch (Exception e) {
                System.out.println(e);
            }
            em=factory.createEntityManager(); // the second instance stops here
    ...

with an persistence.xml of

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="1.0"
    xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
    <persistence-unit name="default">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider> 

        <class>myclasshere</class>


        <properties>
            <property name="eclipselink.ddl-generation" value="create-tables" />
            <property name="eclipselink.ddl-generation.output-mode" value="database" />     

            <property name="eclipselink.jdbc.read-connections.min" value="1" />
            <property name="eclipselink.jdbc.write-connections.min" value="1" />
            <property name="eclipselink.jdbc.batch-writing" value="JDBC" />
            <property name="eclipselink.logging.level" value="SEVERE" />
            <property name="eclipselink.logging.timestamp" value="false" />
            <property name="eclipselink.logging.session" value="false" />
            <property name="eclipselink.logging.thread" value="false" />    
        </properties>
    </persistence-unit>
</persistence>

The program stalls / does not continue in the second instance beyond this step:

em=factory.createEntityManager();

Debugging the program step by step showed me, that nothing happens at this point. Perhaps the program runs into a timeout. I havent been wainting for more than 1 minute....

Do you have any clues what might cause this stall might?