Java coding standards

[Fatal Error]

Hello Ubuntu-Devs,

this is my first post to the list, after using ubuntu right from the start I felt it was time to contribute to the - in 
my opinion most promising - linux distribution. I´d like to excuse for my english, I´m not a native speaker but I try to 
do my best :) . Here´s my first question, which could not be answered neither by the Ubuntu wiki nor by Google: are there
any recommended coding standards for ubuntu projects? Like "one has to use the GNU Java coding standards for a pure Java
project"? Is it sufficient to use an arbitrary coding scheme, and use this scheme consistently throughout the code?

I have plans for some Java projects that might be nice additions to the universe repos, so before I start to evolve my 
ideas and put them down into code I´d like to know if there are any special rules I have to follow....

so long,
many greetings