Description of problem:

When trying to clone an VM from a Snapshot throws an error on the WEB-UI: "General command validation failure."

Looking in the log of the engine "engine.log" I saw a NullPointerException thrown.

I show the relevant part of the engine.log:

2015-05-19 01:36:53,115 INFO  [org.ovirt.engine.core.bll.AddVmFromSnapshotCommand] (ajp--127.0.0.1-8702-4) [2ba4e367] Lock Acquired to object EngineLock [exclusiveLocks= key: 34b5ca8d-5ff4-4cd1-a117-fafb79b60f4c value: VM
key: test-vm value: VM_NAME
, sharedLocks= ]
2015-05-19 01:36:53,404 ERROR [org.ovirt.engine.core.bll.AddVmFromSnapshotCommand] (ajp--127.0.0.1-8702-4) [2ba4e367] Error during CanDoActionFailure.: java.lang.NullPointerException
	at org.ovirt.engine.core.bll.AddVmFromSnapshotCommand.getDestintationDomainTypeFromDisk(AddVmFromSnapshotCommand.java:113) [bll.jar:]
	at org.ovirt.engine.core.bll.AddVmFromSnapshotCommand.adjustDisksImageConfiguration(AddVmFromSnapshotCommand.java:105) [bll.jar:]
	at org.ovirt.engine.core.bll.AddVmFromSnapshotCommand.getAdjustedDiskImagesFromConfiguration(AddVmFromSnapshotCommand.java:97) [bll.jar:]
	at org.ovirt.engine.core.bll.AddVmFromSnapshotCommand.canDoAction(AddVmFromSnapshotCommand.java:152) [bll.jar:]
	at org.ovirt.engine.core.bll.CommandBase.internalCanDoAction(CommandBase.java:768) [bll.jar:]
	at org.ovirt.engine.core.bll.CommandBase.executeAction(CommandBase.java:347) [bll.jar:]
	at org.ovirt.engine.core.bll.Backend.runAction(Backend.java:430) [bll.jar:]
	at org.ovirt.engine.core.bll.Backend.runActionImpl(Backend.java:411) [bll.jar:]
	at org.ovirt.engine.core.bll.Backend.runAction(Backend.java:369) [bll.jar:]
	at sun.reflect.GeneratedMethodAccessor307.invoke(Unknown Source) [:1.7.0_79]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_79]
	at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_79]
	at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.delegateInterception(Jsr299BindingsInterceptor.java:114) [jboss-as-weld-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:125) [jboss-as-weld-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:135) [jboss-as-weld-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.ovirt.engine.core.bll.interceptors.ThreadLocalSessionCleanerInterceptor.injectWebContextToThreadLocal(ThreadLocalSessionCleanerInterceptor.java:13) [bll.jar:]
	at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source) [:1.7.0_79]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_79]
	at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_79]
	at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptorFactory$ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptorFactory.java:123) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:36) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:82) [jboss-as-weld-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:53) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.singleton.SingletonComponentInstanceAssociationInterceptor.processInvocation(SingletonComponentInstanceAssociationInterceptor.java:53) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx(CMTTxInterceptor.java:211) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.supports(CMTTxInterceptor.java:363) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:194) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:59) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:165) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:173) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]
	at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:72) [jboss-as-ee-7.1.1.Final.jar:7.1.1.Final]
	at org.ovirt.engine.core.common.interfaces.BackendLocal$$$view6.runAction(Unknown Source) [common.jar:]
	at org.ovirt.engine.ui.frontend.server.gwt.GenericApiGWTServiceImpl.runAction(GenericApiGWTServiceImpl.java:134)
	at sun.reflect.GeneratedMethodAccessor306.invoke(Unknown Source) [:1.7.0_79]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.7.0_79]
	at java.lang.reflect.Method.invoke(Method.java:606) [rt.jar:1.7.0_79]
	at com.google.gwt.rpc.server.RPC.invokeAndStreamResponse(RPC.java:196)
	at com.google.gwt.rpc.server.RpcServlet.processCall(RpcServlet.java:172)
	at com.google.gwt.rpc.server.RpcServlet.processPost(RpcServlet.java:233)
	at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.jboss.weld.servlet.ConversationPropagationFilter.doFilter(ConversationPropagationFilter.java:62) [weld-core-1.1.5.AS71.Final.jar:2012-02-10 15:31]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.utils.servlet.HeaderFilter.doFilter(HeaderFilter.java:94) [utils.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.ui.frontend.server.gwt.GwtCachingFilter.doFilter(GwtCachingFilter.java:132)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.branding.BrandingFilter.doFilter(BrandingFilter.java:72)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.utils.servlet.LocaleFilter.doFilter(LocaleFilter.java:64) [utils.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.aaa.filters.SessionMgmtFilter.doFilter(SessionMgmtFilter.java:31) [aaa.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.aaa.filters.LoginFilter.doFilter(LoginFilter.java:74) [aaa.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.aaa.filters.NegotiationFilter.doFilter(NegotiationFilter.java:113) [aaa.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.aaa.filters.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:90) [aaa.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.ovirt.engine.core.aaa.filters.SessionValidationFilter.doFilter(SessionValidationFilter.java:73) [aaa.jar:]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:489)
	at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.jboss.web.rewrite.RewriteValve.invoke(RewriteValve.java:466)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505)
	at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:445)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
	at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_79]

2015-05-19 01:36:53,538 INFO  [org.ovirt.engine.core.bll.AddVmFromSnapshotCommand] (ajp--127.0.0.1-8702-4) [2ba4e367] Lock freed to object EngineLock [exclusiveLocks= key: 34b5ca8d-5ff4-4cd1-a117-fafb79b60f4c value: VM
key: test-vm value: VM_NAME
, sharedLocks= ]





oVirt Engine Version: 3.5.1.1-1.el6



The storage domain is a NFSv3 domain.

Steps to Reproduce:

1. Make an snapshot of a running vm.
2. After the snapshot is finished, try to clone it.
3. Error.