Hi, I am trying to develop a python based management client module. My module has the following dependencies : <dependencies> <module name="javax.api"/> <module name="sun.jdk"/> <module name="org.jboss.as.cli"/> <module name="org.jboss.logmanager" services="import"/> <module name="org.jboss.as.controller-client"/> <module name="org.jboss.logging"/> <module name="org.jboss.as.protocol"/> <module name="org.jboss.dmr"/> <module name="org.jboss.sasl"/> <module name="org.jboss.staxmapper"/> </dependencies> When I run my module I get the following error : Caused by: java.lang.ClassNotFoundException: javax.security.auth.callback.CallbackHandler from [Module "org.jboss.as.controller-client:main" from local module loader @bd86fd3 (roots: /jboss-as-7.1.1.Final/modules,/custom/modules)] at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468) at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456) at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:423) at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398) at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120) ... 37 more The org.jboss.as.cli module has similar dependencies and does not encounter the same problem. What am I doing wrong? cheers, Ravan