Apparently there was some kind of silent failure going on behind the scenes. It seems that the dynamically loaded JAR needed filesystem read access to the JAR in WEB-INF/lib, and that both the webapp and the other JAR needed to have java.net.SocketPermission for connect and resolve against the database server.
Not sure why this manifested itself as a ClassNotFoundException instead of a SecurityException telling me that I can't read the PostgreSQL Driver JAR... Thanks for your help, everyone! > -----Original Message----- > From: Jon Pearson > Sent: Thursday, June 11, 2009 1:14 PM > To: Tomcat Users List > Subject: Classloader Issues > > I am encountering an odd problem with Tomcat (6.0.18). When the Java > security manager is enabled, I get a ClassNotFoundException when I try > to load the Postgres database driver using Class.forName() and a URL > classloader pointed at a jar; its parent classloader is the Webapp > classloader. > > But, when the Java security manager is disabled, everything works > smoothly and no ClassNotFoundException is thrown. > > I've stepped through the code (using Eclipse's debugger) and not found > anything that stands out, and I've set a general breakpoint on all > SecurityExceptions, caught or uncaught. None are thrown. > > Has anyone else encountered a problem like this? Is there a > way for the > Java security manager to block a class from loading without a > SecurityException being thrown? > > Jonathan P. Pearson - Software Engineer > -------------------------------------------------- > SIXNET - Solutions for Your Industrial Networking Challenges > 331 Ushers Road, Ballston Lake, NY 12019 > Tel: 1.518.877.5173, Fax: 1.518.877.8346 > www.sixnet.com > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
