I tried $ export JAVA_ROOT=/usr/lib/java ...then I checked to see whether it is working properly or not: adagilson@linux:~> echo $JAVA_ROOT /usr/lib/java But the same error continues to be shown: adagilson@linux:~>java -classpath Wapaka.jar:WPKScriptLibs.jar:WPKScript.jar:. Wapaka Unable to initialize threads: cannot find class java/lang/Thread So I closed the gnome terminal and opened again to check if the PATH was set effectively: adagilson@linux:~> echo $JAVA_ROOT ...the result was a blank line again as I hadn't tried to configure the path ever before. Always I come back to use export JAVA_ROOT=/usr/lib/java it won't have any effect at the next time when a terminal console will be open. Is there a way to fix it? Just typing export JAVA_ROOT=/usr/lib/java is not making the job. Something I am forgeting? Thanks for helping! a.

put following row to your .bashrc file under your home-directory..

export $JAVA_ROOT= /what/ever/location/the/root/has

(mine is

$JAVA_ROOT=/usr/lib/java2/j2sdk1.4.0_01)

the start new shell and test in it

echo $JAVA_ROOT

not that should be correct

-- Adagilson Batista Bispo da Silva Bibliotecário FIOCRUZ-Centro de Pesquisa Aggeu Magalhães Fone 81 3302-6520