How to configure datasource in J2EE standard descriptors?

Issue

• we are developing an application and trying to use the descriptor to deploy a datasource. We want to keep to the current JEE standard, hence configured the datasource in ear's application.xml file. Our Deployment fails because of the missing datasource. It seems that JBoss try to deploy the WAR-File first and after this task JBoss starts to create our datasource. Thus, maybe the deployment order is not correct.