Hi Team,

I try to get the disk statistics using the following Url: 

/ovirt-engine/api/disks?follow=statistics

and I get the following error in oVirt,

2018-08-17 15:34:24,663+08 ERROR [io.undertow.request] (default task-815) UT005023: Exception handling request to /ovirt-engine/api/v4/disks: java.lang.RuntimeException: org.jboss.resteasy.spi.UnhandledException: java.lang.IllegalStateException: Problem following 'statistics' link in Disks entity.
        at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImpl(RequestDispatcherImpl.java:245) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.spec.RequestDispatcherImpl.forwardImplSetup(RequestDispatcherImpl.java:147) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.spec.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:111) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.api.restapi.invocation.VersionFilter.doFilter(VersionFilter.java:180) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.invocation.VersionFilter.doFilter(VersionFilter.java:98) [restapi-jaxrs.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.api.restapi.invocation.CurrentFilter.doFilter(CurrentFilter.java:117) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.invocation.CurrentFilter.doFilter(CurrentFilter.java:72) [restapi-jaxrs.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.core.aaa.filters.RestApiSessionMgmtFilter.doFilter(RestApiSessionMgmtFilter.java:78) [aaa.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.core.aaa.filters.EnforceAuthFilter.doFilter(EnforceAuthFilter.java:42) [aaa.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.core.aaa.filters.SsoRestApiNegotiationFilter.doFilter(SsoRestApiNegotiationFilter.java:84) [aaa.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.core.aaa.filters.SsoRestApiAuthFilter.doFilter(SsoRestApiAuthFilter.java:47) [aaa.jar:]
        at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) [undertow-servlet-2.0.9.Final.jar:2.0.9.Final]
        at org.ovirt.engine.core.aaa.filters.SessionValidationFilter.doFilter(SessionValidationFilter.java:59) [aaa.jar:]


Caused by: java.lang.IllegalStateException: Problem following 'statistics' link in Disks entity.
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.fetchData(LinkFollower.java:185) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.followLink(LinkFollower.java:144) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.followLinks(LinkFollower.java:132) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.followLinks(LinkFollower.java:53) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.resource.BaseBackendResource.follow(BaseBackendResource.java:412) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.resource.DisksResource.doList(DisksResource.java:222) [restapi-definition.jar:]
        at sun.reflect.GeneratedMethodAccessor407.invoke(Unknown Source) [:1.8.0_181]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_181]
        at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_181]
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:510) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:401) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$0(ResourceMethodInvoker.java:365) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.interception.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:361) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:367) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:339) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:137) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:100) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:441) [resteasy-jaxrs-20-3.5.1.Final.jar:3.5.1.Final]
        ... 96 more
Caused by: java.lang.IllegalStateException: Problem fetching 'statistics' from Disk
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.fetchData(LinkFollower.java:219) [restapi-jaxrs.jar:]
        at org.ovirt.engine.api.restapi.resource.utils.LinkFollower.fetchData(LinkFollower.java:182) [restapi-jaxrs.jar:]
        ... 114 more
Caused by: java.lang.NullPointerException

Any thoughts on this?

Thanks,
Hari


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