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| layout: default_md |
| title: The Broker will not start |
| title-class: page-title-activemq5 |
| type: activemq5 |
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| [FAQ](faq) > [Errors](errors) > [The Broker will not start](the-broker-will-not-start) |
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| It's been reported that during broker start some users get a message similar to: |
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| 15:26:29 INFO Opening journal. Caught: javax.jms.JMSException: Failed to open transaction journal: java.io.IOException: Invalid argument |
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| It could be [this problem](journal-is-already-opened-by-this-application) or the problem could be due to a bad os/jvm combination. See [Known Bad OS and JVM Combinations](known-bad-os-and-jvm-combinations) |
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