Description of problem:

Caused by: java.lang.NullPointerException
        at org.rhq.enterprise.server.measurement.MeasurementChartsManagerBean.getAggregateMetricDisplaySummaries(MeasurementChartsManagerBean.java:498) [rhq-server.jar:4.9.0]
        at org.rhq.enterprise.server.measurement.MeasurementChartsManagerBean.getMetricDisplaySummariesForCompatibleGroup(MeasurementChartsManagerBean.java:118) [rhq-server.jar:4.9.0]

The code:

    private List<MetricDisplaySummary> getAggregateMetricDisplaySummaries(Subject subject, EntityContext context,
        int[] measurementDefinitionIds, long begin, long end, boolean enabledOnly) throws MeasurementException {
...

            MeasurementDefinition definition = entityManager.find(MeasurementDefinition.class, definitionId);
            summary.setDefinitionId(definition.getId());

I'm guessing the definitionId is invalid.

Version-Release number of selected component (if applicable): 4.9


How reproducible:

It seems to be caused if something happens with a plugin update.

Code should guard against invalid IDs and log a warning instead.


Steps to Reproduce:
1. Add plugin
2. Revise plugin (how?)


Additional info: