Summary: abcl-contrib is fine, but there is an issue with Maven (even though mvn.bat is in path). Details below:
Below is the output of my --no-init startup. I compared my output with yours, and I don't see anything substantially different. Loading abcl-contrib works fine. The ASDF version is 3.1.7.27.
c:\Users\977315\Documents\projects\software-development\workbooks\gswsql+abcl+cl-dbi>"C:\Windows\sysWOW64\java.exe" -cp "c:\mv-program-files\abcl-bin-1.4.0";"c:\mv-program-files\abcl-bin-1.4.0\abcl.jar" org.armedbear.lisp.Main --noinit
Armed Bear Common Lisp 1.4.0
Java 1.7.0_51 Oracle Corporation
Java HotSpot(TM) Client VM
Low-level initialization completed in 0.279 seconds.
Startup completed in 3.79 seconds.
Type ":help" for a list of available commands.
CL-USER(1): ; Loading C:/Users/977315/.emacs.d/elisp/slime/swank-loader.lisp ...
; Loaded C:/Users/977315/.emacs.d/elisp/slime/swank-loader.lisp (3.379 seconds)
;; Swank started at port: 60222.
60222
CL-USER(2):
CL-USER(2): (require :abcl-contrib)
Using probed value of abcl-contrib:
'C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar'.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/quicklisp/ to ASDF.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/mvn/ to ASDF.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/jss/ to ASDF.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/jfli/ to ASDF.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/asdf-jar/ to ASDF.
Added jar:file:C:/mv-program-files/abcl-bin-1.4.0/abcl-contrib.jar!/abcl-asdf/ to ASDF.
("uiop" "UIOP" "asdf" "ASDF" "ABCL-CONTRIB")
CL-USER(3):