Posted by gouessej on Oct 04, 2012; 1:28pm
URL: https://forum.jogamp.org/no-jogl-in-java-library-path-Error-tp4026357p4026364.html

Look at that:
http://jogamp.org/wiki/index.php/Using_JOGL_in_Java_Web_Start#Option_1:_Use_JogAmp.27s_hosted_JAR_and_JNLP_files

Just add the line starting with "extension" into your JNLP file.