Originally I had indeed placed all the code (also the "drop-ins" for Spring) under src/main/java but I then got the very same errors as described in my previous email.
And also now, after I have moved them back into the java sub-tree I keep getting the same error. So, there must be something else still wrong here... ?!?
I provide an updated view of how my java source and resource tree currently looks like.
* <project_root>
|
+-* src
| +-* main
| | +-* java
| | | +-* ch
| | | | +-* zh
| | | | | +-* registerjp
| | | | | | +-* client
| | | | | | | +-- ...
| | | | | | +-* shared
| | | | | | | +-* security
| | | | | | | | +-- ZHStRegisterJPUser.java
| | | | | | | | +-- ...
| | | | | | | +-- ...
| | | | | | +-* server
| | | | | | | +-- ...
| | | +-* org << copies of the referenced Spring source files below this folder
| | | | +-* springframework
| | | | | +-* security
| | | | | | +-* core
| | | | | | | +-- GrantedAuthority.java
| | | | | | | +-- CredentialsContainer.java
| | | | | | | +-- ...
| | | | | | | +-* userdetails
| | | | | | | | +-- User.java
| | | | | | | | +-- UserDetails.java
| | ...
| | +-* resource
| | | +-* ch
| | | | +-* zh
| | | | | +-* registerjp
| | | | | | +-- ZHStRegisterJPWeb.gwt.xml << our application's gwt-file
| | | | | ...
| | | |
| | | +-* org
| | | | +-* springframework
| | | | | +-- GwtSpring.gwt.xml << the added Spring gwt-file
| | | ...
[Note: '*' are directories]