Oracle Tips 7 [ora 12519 tnsno appropriate service handler found]

Using JDBC with Oracle 10g i found this error : “ora 12519 tnsno appropriate service handler found”, today i found an article on Internet about.
I only execute on apex query :

   ALTER SYSTEM SET PROCESSES=150 SCOPE=SPFILE;

after that i restarted my Oracle10gXe server on my server, and all works well !!!
incredible