Any logs?

I am seeing this as well –

logfile shows:

Dec 2, 2012 2:13:58 PM hudson.ExpressionFactory2$JexlExpression evaluate
WARNING: Caught exception evaluating: it.getPercent(job). Reason: java.lang.NullPointerException
java.lang.NullPointerException
at jenkins.plugins.emmacoveragecolumn.EmmaColumn.getPercentageFloat(EmmaColumn.java:82)
at jenkins.plugins.emmacoveragecolumn.EmmaColumn.getLinePercent(EmmaColumn.java:66)
at jenkins.plugins.emmacoveragecolumn.EmmaColumn.getPercent(EmmaColumn.java:37)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.commons.jexl.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:258)
at org.apache.commons.jexl.parser.ASTMethod.execute(ASTMethod.java:104)
at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:72)
at org.apache.commons.jelly.tags.core.CoreTagLibrary$3.run(CoreTagLibrary.java:134)
...

I would bump up the priority on this, since rendering a view is extremely slow when these NPE are occurring. If I remove the emma column from the view config, then it renders almost instantaneously.

component changed to emmacoveragecolumn.

I'll take a look at it. Are you seeing it when the coverage is 0 or when there is no coverage (i.e. a project not using emma)?

I fixed an issue where if the lastSuccessfulBuild didn't have an EmmaBuildAction it was throwing a NPE. I think this is the issue you were seeing.

https://github.com/jenkinsci/emmacoveragecolumn-plugin/commit/8b291adce6d3974243f71217c42fb5681e2a8def

Thanks Dan – reviewing the cases, I was actually seeing it when there was no coverage reported in some of the view jobs.

OK ... I think the fix I checked in should address that. Not sure what the schedule is for the new version of the plugin being available to install.