Spring Roo - Error: One or more exceptions caught, see full set in UmbrellaException#getCauses

Problem

When trying to save a entity in spring roo (using in the web tier gwt) it showed the following error message:

Error: One or more exceptions caught, see full set in UmbrellaException#getCauses

Reason

The declaration of an empty constructor was causing the problem. The roo cause was not identified.

Solution

Remove the constructor. In my case the code was changed from:

public class A {

transient B b;

A(){

this.b = getStub();

}

...

}

to:

public class A {

transient B b= getStub();

...

}