In this recipe, we will show how to use a Java Callout action to invoke a Java method, which will return XML messages. We have already seen that a Java method can return Java primitives or String values in the Using the Java Callout action to invoke Java code recipe. But the Java Callout action can also work with Apache XMLBeans, which allows us to directly pass XML message from a Java method to an OSB proxy service and vice versa, without having them serialized from String to XML. The Oracle Service Bus natively works with these XMLBean objects.
We will implement a proxy service which invokes a Java class inside a JAR using the Java Callout action, as shown in the following screenshot:
The Java class will format an XML message using Apache XMLBeans and return it to the proxy service. The message is then returned to the caller of the proxy service.
