It's possible to get ClassNotFoundException during addPackage(..) since the Classes found are loaded. If a Class found refers to a Class not in the Classloader.

Currently the Exception states only which class it can not find, it would be helpful to add which Class is being loaded that cause the ClassNotFoundException.

java.lang.NoClassDefFoundError: org/aopalliance/intercept/MethodInvocation
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
at org.jboss.shrinkwrap.impl.base.container.ContainerBase$2.classFound(ContainerBase.java:932)
at org.jboss.shrinkwrap.impl.base.URLPackageScanner.foundClass(URLPackageScanner.java:178)
at org.jboss.shrinkwrap.impl.base.URLPackageScanner.handleArchiveByFile(URLPackageScanner.java:134)
at org.jboss.shrinkwrap.impl.base.URLPackageScanner.handle(URLPackageScanner.java:156)
at org.jboss.shrinkwrap.impl.base.URLPackageScanner.scanPackage(URLPackageScanner.java:107)
at org.jboss.shrinkwrap.impl.base.container.ContainerBase.addPackages(ContainerBase.java:917)