[ARTEMIS-2830] NPE in XML exporter

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.14.0
• Assignee: Justin Bertram
• Reporter: Justin Bertram
• Created: 29/Jun/20 18:25
• Updated: 09/Jul/20 23:24
• Resolved: 01/Jul/20 19:24

Description

It's sometimes possible for there to be acks in the journal for messages which aren't actually in the journal any more. In this situation you would likely see messages like this in the log when starting the broker:

2020-06-24 10:28:08,630 ERROR [org.apache.activemq.artemis.core.server] AMQ224009: Cannot find message 20,491,425
2020-06-24 10:28:08,630 ERROR [org.apache.activemq.artemis.core.server] AMQ224010: Cannot find queue messages for queueID=996 on ack for messageID=20,491,432

If you run the data exp command to export the journal in this condition you'll hit a NullPointerException:

java.lang.NullPointerException
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.removeAcked(XmlDataExporter.java:279)
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.processMessageJournal(XmlDataExporter.java:267)
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.writeXMLData(XmlDataExporter.java:149)
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.writeOutput(XmlDataExporter.java:143)
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.process(XmlDataExporter.java:132)
 at org.apache.activemq.artemis.cli.commands.tools.xml.XmlDataExporter.execute(XmlDataExporter.java:99)
 at org.apache.activemq.artemis.cli.Artemis.internalExecute(Artemis.java:150)