2012/3/16 Johannes Ernst <jer...@netmesh.us>: > > On Mar 15, 2012, at 16:50, Konstantin Kolinko wrote: > >> 2012/3/16 Johannes Ernst <jer...@netmesh.us>: >>> I've implemented my own org.apache.catalina.loader.WebappLoader. It >>> consults a bunch of JARs held in the file system outside of the WAR. >>> >>> One of those outside JARs contains a custom JSP tag. >>> >>> When attempting to compile the JSP, Jasper fails to find it. I'm getting >>> this: >>> javax.servlet.ServletException: org.apache.jasper.JasperException: Unable >>> to compile class for JSP: >>> >>> An error occurred at line: 13 in the jsp file: /foobar.jsp >>> com.example.MyCustomTag cannot be resolved to a type >> >> >>> My guess is that I somehow need to tell Jasper that it should use my custom >>> WebappLoader when looking for custom tags. >> >> You cannot. Jasper is independent from Catalina. > > Darn … > >> Moreover Jasper has to pass a classpath to an external Java compiler >> (ecj or javac). The classpath is constructed and passed to Jasper as >> String. > > Could you point me to where in the code it does this? I was looking for > invocations of something like > WebappLoader.getRepositories() > but came up empty.
WebappLoader is not a class loader per se. It is just a Tomcat component that configures a class loader. The class loader is WebappClassLoader class. The method is WebappClassLoader#getURLs() that returns URL[] In Tomcat 6.0.x the following places of interest call it: - in WebappLoader: WebappLoader#setClassPath() - in Jasper: JspRuntimeContext#initClassPath()\ JspRuntimeContext#initSecurity() TldLocationsCache#scanJars() >>> How would I do that? A few hours worth of poking around in the source code >>> hasn't helped … >>> >>> This is Tomcat 6.0.28 but any answer for any version is appreciated. >>> >> >> Have you looked at VirtualWebappLoader class? I would think it already >> does what you are trying to do. > > Does it work with custom JSP tags? If so, I fail to see where it accomplishes > that ... Yes. Best regards, Konstantin Kolinko --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
