Signing fails if passphrase contains non-English letters

Here is the result of mvn -v:

Apache Maven 2.2.1 (r801777; 2009-08-06 22:16:01+0300)
Java version: 1.6.0_22
Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
Default locale: fi_FI, platform encoding: MacRoman
OS name: "mac os x" version: "10.6.4" arch: "x86_64" Family: "mac"

If I use gpg from the command line everything works just perfect. For example:

gpg -ab MyClass.java

gpg will ask for passphrase and everything works as expected. Maven gpg plugin however does not work no matter if I am using -Dgpg.passphrase or let the plugin ask for the passphrase. It started to work similarily than gpg when I removed all the Scandinavian letters from the passphrase.

One more thing. I noticed that if Ctrl-C is pressed while Maven gpg plugin asks for passphrase all the letters typed to the point when Ctlr-C was pressed are visible.

I have got the same problem, but apparently not related to encoding and/or character sets. In other words, my passphrase is all numbers and letters only.

The problem for my seems to occur only when I try to use -Dgpg.keyname next to -Dgpg.passphrase. Why do I need to do this ? I have got more than on key in my setup, and I would like to use the non-default one.

Using pgp, I can perfectly well sign any file with the right key using

> gpg --local-user <some-identity> -ab <filename>

Here's my setup re: Maven:

C:\Users\me>mvn -v
Apache Maven 3.0.2 (r1056850; 2011-01-09 01:58:10+0100)
Java version: 1.5.0_22, vendor: Sun Microsystems Inc.
Java home: C:\dev\java\jdk1.5.0_22\jre
Default locale: de_AT, platform encoding: Cp1252
OS name: "windows 7", version: "6.1", arch: "x86", family: "windows"

Note that one can use the GPG2 agent to handle passwords.

Could somebody create a throwaway gpg key based test case? (i.e. create a GPG key that is not yours and you created just for the throw away test case, attach the key, the passphrase for the key, and hopefully a test project that shows the buggy behaviour)