Bug 972574 - NPE in DataMigrator with empty (1h) table
NPE in DataMigrator with empty (1h) table
Status: NEW
Product: RHQ Project
Classification: Other
Component: Monitoring (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified (vote)
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Assigned To: RHQ Project Maintainer
Mike Foley
Depends On:
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Reported: 2013-06-10 03:04 EDT by Heiko W. Rupp
Modified: 2013-06-10 03:04 EDT (History)
1 user (show)

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Description Heiko W. Rupp 2013-06-10 03:04:37 EDT
Description of problem:

$ java -jar target/migrator-executable/data-migrator-4.8.0-SNAPSHOT.jar   --cassandra-port=9142
Estimation process - starting

	at org.rhq.server.metrics.migrator.workers.MetricsIndexUpdateAccumulator.getLastAggregationTime(MetricsIndexUpdateAccumulator.java:158)
	at org.rhq.server.metrics.migrator.workers.MetricsIndexUpdateAccumulator.<init>(MetricsIndexUpdateAccumulator.java:77)

This happens when e.g. the 1h (and probably the 6h) table has no data in it.

Problem is in

        if (duration != null && queryString != null) {
            Query query = session.createSQLQuery(queryString);
            String queryResult = query.uniqueResult().toString();

Here query.uniqueResult() can be null if no data is present

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