Elgs, On 9/25/12 1:15 PM, Elgs Chen wrote: > Hi Mark, > > I finally get my homework done. Thank you so much for pointing me to the > right direction. That really helped me to gain huge insight into the inner > world of the tomcat. > > I used JPDA to attach my eclipse to tomcat. Then I was able to see everything > happens with the WebappClassLoader.loadClass. For my question, the key is to > set the WebappClassLoader's parent class loader. Previously it was the system > class loader, which is not intended. As this became obvious, I added a line > to set the server's parent class loader, like this: > > final StandardServer server = (StandardServer) tomcat.getServer(); > server.setParentClassLoader(TomcatMain.class.getClassLoader()); > > Now the server's parent class loader becomes my URLClassLoader, and that is > the class loader being able to load all the jars I put in the lib directory. > Then I start my Bootstrap, it works like a charm!! > > Mark, thank you so much. I really really appreciate you fast and kind help!
Note that Tomcat separates ClassLoaders in this way to protect "system"-level classes from being loaded by web applications. By changing the parent ClassLoader, you are undoing that protection. -chris
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