[05:14] When I try to open a jnlp file ( http://www.topcoder.com/contest/aren...ppletProd.jnlp ) I get the following error messasge: [05:14] netx: Launch Error: Could not launch JNLP file. (java.lang.reflect.InvocationTargetException null) (java.lang.SecurityException Changing the SecurityManager is not allowed.) [05:14] I am using Ubuntu 8.04. [07:04] akhil_: the address is not complete so I couldn't download the JNLP to verify it, but it seems like a security problem. "Changing SecurityManager is not allowed" tell me that the java application is trying to instantiate a new SecurityManager which is not possible under JNLP 'cause there is a SecurityManager already instantiated [10:05] Hi, I am tring to import org.antlr.runtime to my simple java program and I am given the message that the package does not exist. [10:07] I added to my $CLASSPATH all the jars that I located with antlr.