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Key: NUCCORE-866
Type: Bug Bug
Status: Closed Closed
Resolution: Fixed
Priority: Major Major
Assignee: Unassigned
Reporter: Yevgeny Shakhnovich
Votes: 0
Watchers: 0

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DataNucleus Core

NullPointerException in NucleusContext.getStatistics()

Created: 28/Jun/12 11:12 PM   Updated: 06/Jul/12 10:00 AM   Resolved: 29/Jun/12 07:27 AM
Component/s: None
Affects Version/s: 3.1.0.m4
Fix Version/s: 3.1.0.m5

Environment: Linux, actually does not matter

 Description  « Hide
This code contains a bug. When statistics is null, using it in statistics.getClass() leads to NullPointerException. Actually, this code is full of bugs. Assume that getJMXManager returns null, you will use null as a name for FactoryStatistics

public synchronized FactoryStatistics getStatistics()
        if (statistics == null && statisticsEnabled())
            String name = null;
            if (getJMXManager() != null)
                // Register the MBean with the active JMX manager
                name = jmxManager.getDomainName() + ":InstanceName=" + jmxManager.getInstanceName() +
                    ",Type=" + ClassUtils.getClassNameForClass(statistics.getClass()) +
                    ",Name=Factory" + random.nextInt();
            statistics = new FactoryStatistics(name);
            if (jmxManager != null)
                // Register the MBean with the active JMX manager
                jmxManager.registerMBean(this.statistics, name);
        return statistics;

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Andy Jefferson added a comment - 29/Jun/12 07:27 AM
SVN trunk uses FactoryStatistics to set the "name" (which is only relevant if using JMX anyway, so is irrelevant if null for non-JMX cases). And no, that code was not "full of bugs", just had a cut and paste on the class name to use in the name. Perhaps as your code must be so perfect you can just contribute a patch next time ... as the bug reporting guide asks.