Its the SecurityDeployer having a write-only ignoreSuffixes property: AbstractBeanMetaData@7ba65cf7{name=SecurityDeployer bean=org.jboss.deployment.security.SecurityDeployer properties=[ignoreSuffixes] constructor=null installs=[MainDeployer.addDeployer] uninstalls=[MainDeployer.removeDeployer]} ... AbstractPropertyInfo@1943b93b{name=ignoreSuffixes getter=null setter=ReflectMethodInfoImpl@2b5d7e8e{name=setIgnoreSuffixes[ParameterizedClassInfo(a)71fb2e0{java.util.HashSet<java.lang.String>}] return=void}} The problem occurs at the Configurator.getPropertyGetterJoinPoint | 18:49:29,115 WARN [AbstractSetMetaData] Exception in preinstantiated lookup: | java.lang.NullPointerException | at org.jboss.kernel.plugins.config.Configurator.getPropertyGetterJoinPoint(Configurator.java:381) | at org.jboss.kernel.plugins.config.Configurator.getPropertyGetterJoinPoint(Configurator.java:360) | at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getPropertyGetterJoinPoint(AbstractKernelConfigurator.java:115) | at org.jboss.beans.metadata.plugins.AbstractTypeMetaData.preinstantiatedLookup(AbstractTypeMetaData.java:150) | at org.jboss.beans.metadata.plugins.AbstractCollectionMetaData.getCollectionInstance(AbstractCollectionMetaData.java:208) | at org.jboss.beans.metadata.plugins.AbstractCollectionMetaData.getValue(AbstractCollectionMetaData.java:85) | at org.jboss.kernel.plugins.config.Configurator.getPropertySetterJoinPoint(Configurator.java:502) | at org.jboss.kernel.plugins.config.Configurator.getPropertySetterJoinPoint(Configurator.java:446) | at org.jboss.kernel.plugins.config.Configurator.getPropertySetterJoinPoints(Configurator.java:410) | at org.jboss.kernel.plugins.config.AbstractKernelConfigurator.getPropertySetterJoinPoints(AbstractKernelConfigurator.java:120) | at org.jboss.kernel.plugins.dependency.ConfigureAction.installActionInternal(ConfigureAction.java:54) | Either this code or the caller needs to validate that a getter exists. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4000681#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...