As a convenience when configuring with Java, added another constructor
call that allows setting the delegate and the default listener method
in one line of code.
```java
public MessageListenerAdapter(Object delegate, String defaultListenerMethod) {
this(delegate);
setDefaultListenerMethod(defaultListenerMethod);
}
```
This supports configuring a POJO-based listener with a single step:
```java
@Test
public void testCustomMethodWithAlternateConstructor() throws Exception {
MessageListenerAdapter adapter = new MessageListenerAdapter(target, "customMethod");
adapter.afterPropertiesSet();
adapter.onMessage(STRING_MSG, null);
verify(target).customMethod(PAYLOAD);
}
```
A pure Java configuration bean can now look like this:
```java
@Bean
MessageListenerAdapter listenerAdapter(Receiver receiver) {
return new new MessageListenerAdapter(receiver, "pojoMethod");
}
@Bean
Receiver receiver() {
return new Receiver();
}
```
No longer do we have to A) assign the adapter to a variable and B) call
setDefaultListenerMethod, slimming down pure POJO configuration with pure
Java.
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