Sorry I tried to leave on what I thought were unnecessary details. You are correct my constructor has arguments. One of the arguments comes from another dependency jar that exists in both the webapp and tomcat/lib so I think your guess (c) could be right. I guess the solution would be to move the dependency out of the webapp and into tomcat/lib.
On Fri, May 3, 2013 at 9:16 AM, Konstantin Kolinko <knst.koli...@gmail.com>wrote: > 2013/5/3 Bryan Baugher <bjb...@gmail.com>: > > Hi, > > > > I am running Tomcat 7.0.28 on RHEL 6.2 with a single web app. The web app > > in question uses reflection to load some implementations of our classes > > (kind of like a service loader) knowing the class name. I am trying to > add > > additional implementations by dropping them in the tomcat's lib directory > > but I keep seeing NoSuchMethodError for the constructor to the class. > > > > I know the constructor is there because if I move the jar into the web > > app's lib directory (webapp/[WEB_APP]/WEB_INF/lib) everything works. > > > > I figure this must be some class loader issue I am not understanding but > > these docs[1][2] don't seem to indicate there should be any issue. > > > > -Bryan > > > > [1] - http://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html > > > > [2] - > http://download.oracle.com/otndocs/jcp/servlet-2.4-fr-spec-oth-JSpec/ > > Using the common classloader is somewhat tricky, because the "Webapp > classloader has priority" rule imposed by servlet spec does mess up > things, as explained in [1]. > > Your description does not have enough details, nor source code, nor > stacktaces, and with such I would guess that you have the following: > > a) Your constructor has some arguments > b) The classes mentioned as argument types in that method can be > loaded both from common class loader and from webapp classloader. (If > they cannot be loaded from the former, you are also in trouble). > c) Classes loaded from different classloaders are considered different > by JVM (even if they have the same name and bytecode),. > You are asking for a method specifying its arguments by using classes > loaded by webapp classloader and they do not match the ones loaded by > common classloader > > Just a guess. > > Best regards, > Konstantin Kolinko > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > -- -Bryan
