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javaspringjboss7.xjava-ee-6ejb-3.1

Lookup of same EJB on multiple servers

I am trying to do a lookup from one deployment to another deployment, using exactle the same bean implementations. It is basically a consumer/producer setup with the same beans in both deployments on both machines.

ear
    ejb-api
        com.example.bean
            ConsumerBean
            ProducerBean
    ejb-jar
        com.example.bean
            ConsumerBeanRemote
            ProducerBeanRemote

The ProducerBeanRemote should look up the ConsumerBeanRemote and call its public method.

Our machines are communicating like this:

(Machine A) ProducerBeanRemote --> (Machine B) ConsumerBeanRemote
(Machine A) ProducerBeanRemote --> (Machine C) ConsumerBeanRemote
(Machine A) ProducerBeanRemote --> (Machine D) ConsumerBeanRemote

You get the idea...

So the problem is, it doesn't work. I tried to do a manual lookup using the jboss-as-ejb-client libraries, which didn't work because JBoss locks the EJB selector while starting its container (AND I bet the spec has something to say about manual lookups in a Java EE environment). The next thing I tried was doing a lookup using the feature from Spring, to no avail.

We are using the JBoss Application Server 7.1.1.Final.

I bet there has to be a way to accomplish my setup and I would greatly appreciate any help from the community.

UPDATE:

To connect from ProducerBeanRemote to ConsumerBeanRemote, we need the possibility to specify the remote InitialContext at runtime via configuration.

Properties properties = new Properties();
properties.put("remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED", "false");
properties.put("remote.connections", "default");
properties.put("remote.connection.default.host", "remote-host");
properties.put("remote.connection.default.port", "4447");
properties.put("remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS", "false");

EJBClientConfiguration ejbClientConfiguration = new PropertiesBasedEJBClientConfiguration(properties);
ContextSelector<EJBClientContext> ejbClientContextSelector = new ConfigBasedEJBClientContextSelector(ejbClientConfiguration);
EJBClientContext.setSelector(ejbClientContextSelector);

StatelessEJBLocator<T> locator = new StatelessEJBLocator<>(viewType, appName, moduleName, beanName, distinctName);
return EJBClient.createProxy(locator);

The resulting exception is 

java.lang.SecurityException: EJB client context selector may not be changed at org.jboss.ejb.client.EJBClientContext.setSelector(EJBClientContext.java:181)

We understand that this exception is thrown because of https://issues.jboss.org/browse/AS7-2998, so the question remains: How can we remotely call the same beans in a clean and configurable way?

Solution

  • Nearly the same question as described here: JNDI lookup from one server to many configurable servers

    It seems to be impossible to get a reliant connection between multiple servers via EJB, so we ended up using JMS for our server to server communication. Maybe thats an option for you, too.