Steps to Reproduce

1. check zkex.osgi.jar/META-INF/MANIFEST.MF/Import-Package

steps to reproduce with Apache felix

1. run maven "package" with the attached project zip to produce OSGi jar
2. start felix by java -jar bin/felix.jar, install the jar in felix with install [file path]
3. install OSGi zk.jar, zkex.jar 8.5.0
4. run the information-broker.jar bundle start [bundle id]

Ref: http://www.hascode.com/2010/07/how-to-create-a-simple-osgi-web-application-using-maven/

Current Result

NO org.zkoss.zk.ui.sys specified
It will cause such error:
Caused by: org.eclipse.virgo.kernel.osgi.framework.ExtendedNoClassDefFoundError: org/zkoss/zk/ui/sys/ServerPush in KernelBundleClassLoader: [bundle=zkex_8.5.0]

I can reproduce a similar error under Apache Felix

org.osgi.framework.BundleException: Activator start error in bundle support.information-broker [22].
at org.apache.felix.framework.Felix.activateBundle(Felix.java:2290)
at org.apache.felix.framework.Felix.startBundle(Felix.java:2146)
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:998)
at org.apache.felix.gogo.command.Basic.start(Basic.java:739)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.felix.gogo.runtime.Reflective.invoke(Reflective.java:138)
at org.apache.felix.gogo.runtime.CommandProxy.execute(CommandProxy.java:91)
at org.apache.felix.gogo.runtime.Closure.executeCmd(Closure.java:571)
at org.apache.felix.gogo.runtime.Closure.executeStatement(Closure.java:497)
at org.apache.felix.gogo.runtime.Closure.execute(Closure.java:386)
at org.apache.felix.gogo.runtime.Pipe.doCall(Pipe.java:417)
at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:229)
at org.apache.felix.gogo.runtime.Pipe.call(Pipe.java:59)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NoClassDefFoundError: org/zkoss/zk/ui/sys/ServerPush
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.defineClass(BundleWiringImpl.java:2410)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2194)
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1607)
at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.apache.felix.framework.BundleWiringImpl.getClassByDelegation(BundleWiringImpl.java:1414)
at org.apache.felix.framework.BundleWiringImpl.searchImports(BundleWiringImpl.java:1660)
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1590)
at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.defineClass(BundleWiringImpl.java:2410)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2194)
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1607)
at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at support.impl.Activator.start(Activator.java:13)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:697)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:2240)
... 19 more
Caused by: java.lang.ClassNotFoundException: org.zkoss.zk.ui.sys.ServerPush not found by zkex.nosrc [21]
at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1639)
at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80)
at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 44 more

Expected Result

import-package contains org.zkoss.zk.ui.sys

Workaround

specify it manually