Title: Jersey Client If you have an application that uses jersey-client in any way then it may fail with an error along the lines of: Caused by: java.lang.ClassNotFoundException: com.sun.jersey.core.util.FeaturesAndProperties at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java) at org.apache.tomee.catalina.LazyStopWebappClassLoader.loadClass(LazyStopWebappClassLoader.java) ... 34 more This is due to the fact that the jersey-core.jar contains some classes that should not be deployed as part of a javaEE application. For example, it contains javax.ws.rs.Path but does not contain javax.ws.rs.core.Configurable, so the jar is usually ignored by TomEE. You could switch to using the [Apache CXF Client](http://cxf.apache.org/), which is what we would recommend. If you really want to keep Jersey then you can use set the following property in your *[TomEE]\conf\system.properties* openejb.api.javax.ws.rs.Path.validation=false This will then allow Jersey classes to be loaded by TomEE (After a restart).