GlassFish Embedded 3.1 configuration is not validated

GlassFishConfiguration is not validated, so if instanceRoot is missing it fails with an ugly exception:

Could not setup GlassFish Embedded Runtime
java.lang.RuntimeException: Could not setup GlassFish Embedded Runtime
at org.jboss.arquillian.container.glassfish.embedded_3_1.GlassFishContainer.setup(GlassFishContainer.java:119)
at org.jboss.arquillian.container.glassfish.embedded_3_1.GlassFishContainer.setup(GlassFishContainer.java:51)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController$4.perform(ContainerLifecycleController.java:126)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController$4.perform(ContainerLifecycleController.java:106)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController.forContainer(ContainerLifecycleController.java:183)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController.setupContainer(ContainerLifecycleController.java:105)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80)
at org.jboss.arquillian.impl.client.ContainerDeploymentContextHandler.createContainerContext(ContainerDeploymentContextHandler.java:78)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106)
at org.jboss.arquillian.impl.core.EventImpl.fire(EventImpl.java:67)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController$1.perform(ContainerLifecycleController.java:68)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController$1.perform(ContainerLifecycleController.java:61)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController.forEachContainer(ContainerLifecycleController.java:176)
at org.jboss.arquillian.impl.client.container.ContainerLifecycleController.setupContainers(ContainerLifecycleController.java:60)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106)
at org.jboss.arquillian.impl.core.EventImpl.fire(EventImpl.java:67)
at org.jboss.arquillian.impl.client.ContainerEventController.execute(ContainerEventController.java:54)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.invokeObservers(EventContextImpl.java:98)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:80)
at org.jboss.arquillian.impl.TestContextHandler.createSuiteContext(TestContextHandler.java:54)
at org.jboss.arquillian.impl.core.ObserverImpl.invoke(ObserverImpl.java:90)
at org.jboss.arquillian.impl.core.EventContextImpl.proceed(EventContextImpl.java:87)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:126)
at org.jboss.arquillian.impl.core.ManagerImpl.fire(ManagerImpl.java:106)
at org.jboss.arquillian.impl.EventTestRunnerAdaptor.beforeSuite(EventTestRunnerAdaptor.java:58)
at org.jboss.arquillian.junit.Arquillian.<init>(Arquillian.java:86)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
Caused by: org.glassfish.embeddable.GlassFishException: org.jvnet.hk2.component.ComponentException: Failed to create a habitat
at com.sun.enterprise.glassfish.bootstrap.StaticGlassFishRuntime.newGlassFish(StaticGlassFishRuntime.java:129)
at org.jboss.arquillian.container.glassfish.embedded_3_1.GlassFishContainer.setup(GlassFishContainer.java:115)
Caused by: org.jvnet.hk2.component.ComponentException: Failed to create a habitat
at com.sun.enterprise.module.common_impl.AbstractModulesRegistryImpl.createHabitat(AbstractModulesRegistryImpl.java:169)
at com.sun.enterprise.module.bootstrap.Main.createHabitat(Main.java:425)
at com.sun.enterprise.glassfish.bootstrap.StaticGlassFishRuntime.newGlassFish(StaticGlassFishRuntime.java:104)
Caused by: java.lang.NullPointerException
at com.sun.hk2.component.ExistingSingletonInhabitant.<init>(ExistingSingletonInhabitant.java:57)
at org.glassfish.config.support.DomainXml.decorate(DomainXml.java:139)
at org.glassfish.config.support.DomainXml.decorate(DomainXml.java:139)
(DomainXml.java:133)
at com.sun.enterprise.module.common_impl.AbstractModulesRegistryImpl.populateConfig(AbstractModulesRegistryImpl.java:176)
at com.sun.enterprise.module.common_impl.AbstractModulesRegistryImpl.createHabitat(AbstractModulesRegistryImpl.java:158)