While i work on creating a sample application that shows the PARENT FIRST class-loading of TomEE Plus, I was able to figure out some extent as to why Jersey does not work with TomEE when packaged in EAR/WAR-MODULE/WEB-INF/lib. I removed all the Jar conflicts and ensured that Jersey libraries are only available from EAR-module/war-module/web-inf/lib. My observations are as here under:
I notice that my REST Application and resources are examined twice. Once by OpenEJB container and once by the Jersey Container Servlet. So the first time when resource uris are figured out, the classloader used is org.apache.openejb.core.TempClassLoader and (strangely !) it is able to locate resources from WEB-INF/lib of my REST Web module. The getResources(String name) method fired on this classloader returns Jar URLs - each Jar URL having URI like this: file:/C:/installations/otmm-tomee/apache-tomee-plus-7.0.0/apps/myear/restapi/WEB-INF/lib/myrestresources.jar!/com/xyz/pqr/restapi. I see that all my REST resources are properly identified. One point to notice is that the URI has no trailing slash. However, the REST application is invoked second time from Jersey Servlet. While figuring out resources, the classloader used is an instance of "org.apache.tomee.catalina.TomEEWebappClassLoader" and it returns each URI with a trailing slash as follows. "jar:file:/C:/installations/otmm-tomee/apache-tomee-plus-7.0.0/apps/artesia/restapi/WEB-INF/lib/otmm-rest-representations.jar!/com/opentext/mediamanager/restapi/" - Notice the trailing slash. This was not there when TempClassLoader is used. Jersey does some substring stuff and the trailing slash upsets Jersey's processing and it fails to identify the REST resources. Not sure whether there is anything there in java.lang.ClassLoader contract that getResource(String name) can/should n't list resource URIs with trailing slash. Therefore cannot say whether the getResource implementation of TomEEWebappClassLoader is right or wrong. But this is the reason as to why Jersey fails to identify REST resources. -- View this message in context: http://tomee-openejb.979440.n4.nabble.com/Classloading-issues-integrating-Jersey-2-16-and-apache-tomee-plus-7-0-0-tp4678794p4678970.html Sent from the TomEE Dev mailing list archive at Nabble.com.
