Question

I want my persistence.xml to set some of its properties dynamically, to be specific:

<property name="hibernate.connection.password" value="password"/>
<property name="hibernate.connection.username" value="username"/>

I can build a class that could provide me the data I need, but I don’t know how to set the class up in a way that it works like this:

<property name="hibernate.connection.password" value="${my.clazz.pass}"/>
<property name="hibernate.connection.username" value="${my.clazz.user}"/>

I have tried to set the class up like this

public class clazz{

  String pass;
  String user;

  public clazz(){
    //do stuff to set pass and user
  }

  //getter/setter
}

But that does not work. I haven’t found a way here or in google, but I have seen the ${my.clazz.smth}-way several times.

So, how can I set that up? 🙂

Thanks in advance!

Answer 1

So, resolved this a while ago, but I still didn’t answer:

Anthony Accioly pointed me to the right direction:

I added this to my applicationContext.xml’s entityManagerFactory

<bean id="entityManagerFactory"
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitPostProcessors">
        <bean class="my.package.SetupDatabase">
        </bean>
    </property>
    //the other stuff
</bean>

The corresponding class, in this case I use hibernate:

package my.package;

public class SetupDatabase implements PersistenceUnitPostProcessor {

    private String username;
    private String password;
    private String dbserver;

    public void SetupDatabase(){
        //do stuff to obtain needed information
    }

    public void postProcessPersistenceUnitInfo(MutablePersistenceUnitInfo pui) {
        pui.getProperties().setProperty("hibernate.connection.username", username );
        pui.getProperties().setProperty("hibernate.connection.password", password);
        pui.getProperties().setProperty("hibernate.connection.url", dbserver ); 
    }

}

This way the setup is done just once when starting the whole thing up, but the required data may be ‘outsourced’.

Thanks again for pointing me to the right direction!