Hey All,
I was able to figure out the reason why I am getting this exception.
When BuildFlow schedule a job and Job is in quiet period, 
FlowDownStreamRunDeclarer is giving null build, because of this the 
exception is coming.
I have created a JIRA issue for this and waiting for the response
https://issues.jenkins-ci.org/browse/JENKINS-34516
As soon as this fix done, we are going to have a auto refresh functionality 
in buildgraph-view

Thanks,
Suresh

On Thursday, April 28, 2016 at 8:00:12 AM UTC+5:30, suresh kumar wrote:
>
>
> <https://lh3.googleusercontent.com/-koeq2XqCa3M/VyF1EsM9E7I/AAAAAAAABRE/2MTabrTWXHYL9Os-QmpooEVzoJs3R5H-ACKgB/s1600/1.png>
>
> Hi All,
> I am working on a feature "auto refresh" for buildgraph-view plugin. I 
> have completed every thing and its working fine except one scenario.
>
> The scenario goes like below:
>
> Build(FreeStyleProject) -> Deploy(FreeStyleProject) -> 
> Test(FreeStyleProject) -> StartQA(BuildFlow) -> BuildQA(FreeStyleProject) 
> -> Deploy(FreeStyleProject) -> TestQA(FreeStyleProject)
>
>
> Flow is going fine when we view the BuildGraph after completion of 
> upstream and downstream projects completed.
>
> But the issue is coming when viewing the BuildGraph at running. With 
> FreeStyleProject types no issues, it is with at the time of BuildFlow job 
> type.
>
> Github: https://github.com/pskumar448/buildgraph-view/tree/autorefresh
>
>
> 2016-04-28 07:45:58.056:/jenkins:WARN:  Error while serving 
> http://localhost:8080/jenkins/job/Build/34//BuildGraph/api/json
> java.lang.reflect.InvocationTargetException
>     at sun.reflect.GeneratedMethodAccessor125.invoke(Unknown Source)
>     at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:497)
>     at 
> org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
>     at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
>     at 
> org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
>     at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120)
>     at 
> org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
>     at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863)
>     at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:210)
>     at 
> org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
>     at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863)
>     at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:390)
>     at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863)
>     at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:390)
>     at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863)
>     at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:248)
>     at 
> org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
>     at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:733)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:863)
>     at org.kohsuke.stapler.Stapler.invoke(Stapler.java:636)
>     at org.kohsuke.stapler.Stapler.service(Stapler.java:225)
>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
>     at 
> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:491)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1074)
>     at 
> hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
>     at 
> hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
>     at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
>     at 
> hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
>     at 
> hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
>     at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
>     at 
> org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
>     at 
> hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
>     at 
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1065)
>     at 
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
>     at 
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:185)
>     at 
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
>     at 
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:689)
>     at 
> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:391)
>     at 
> org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:146)
>     at 
> org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
>     at 
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
>     at org.mortbay.jetty.Server.handle(Server.java:285)
>     at 
> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:457)
>     at 
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:751)
>     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:500)
>     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:209)
>     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:357)
>     at 
> org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:329)
>     at 
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:475)
> Caused by: java.io.IOException: Failed to write buildSteps
>     at org.kohsuke.stapler.export.Property.writeTo(Property.java:122)
>     at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:190)
>     at org.kohsuke.stapler.export.Model.writeTo(Model.java:157)
>     at 
> org.kohsuke.stapler.ResponseImpl.serveExposedBean(ResponseImpl.java:267)
>     at hudson.model.Api.doJson(Api.java:205)
>     ... 58 more
> Caused by: java.lang.reflect.InvocationTargetException
>     at sun.reflect.GeneratedMethodAccessor126.invoke(Unknown Source)
>     at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:497)
>     at 
> org.kohsuke.stapler.export.MethodProperty.getValue(MethodProperty.java:66)
>     at org.kohsuke.stapler.export.Property.writeTo(Property.java:116)
>     ... 62 more
> Caused by: java.lang.NullPointerException
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildExecution.<init>(BuildExecution.java:52)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.getExecution(BuildGraph.java:94)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.computeGraphFrom(BuildGraph.java:80)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.computeGraphFrom(BuildGraph.java:84)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.computeGraphFrom(BuildGraph.java:84)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.computeGraphFrom(BuildGraph.java:84)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.computeGraphFrom(BuildGraph.java:84)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.getGraph(BuildGraph.java:69)
>     at 
> org.jenkinsci.plugins.buildgraphview.BuildGraph.getBuildSteps(BuildGraph.java:148)
>     ... 67 more
>
> Thanks in advance,
> Suresh
>

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