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| <h1>Journal is already opened by this application</h1> |
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| <p> <a href="faq">FAQ</a> > <a href="errors">Errors</a> > <a href="exceptions">Exceptions</a> > <a href="journal-is-already-opened-by-this-application">Journal is already opened by this application</a></p> |
| |
| <h3 id="error">Error</h3> |
| |
| <p>You get something like this</p> |
| <div class="highlighter-rouge"><div class="highlight"><pre class="highlight"><code>java.io.IOException: Journal is already opened by this application. |
| at org.apache.activeio.journal.active.ControlFile.lock(ControlFile.java:71) |
| at org.apache.activeio.journal.active.LogFileManager.initialize(LogFileManager.java:120) |
| at org.apache.activeio.journal.active.LogFileManager.<init>(LogFileManager.java:101) |
| at org.apache.activeio.journal.active.JournalImpl.<init>(JournalImpl.java:99) |
| at org.apache.activemq.store.DefaultPersistenceAdapterFactory.createJournal(DefaultPersistenceAdapterFactory.java:198) |
| at org.apache.activemq.store.DefaultPersistenceAdapterFactory.getJournal(DefaultPersistenceAdapterFactory.java:134) |
| </code></pre></div></div> |
| |
| <h3 id="description">Description</h3> |
| |
| <p>Each broker needs to have its own directory to store its journal files etc. The error indicates that you have 2 brokers sharing the same files.</p> |
| |
| <p>A common cause of this exception is that you are running two brokers on one machine using the same config file pointing to the same directory. So a work around is to parameterise the directory name via Spring’s property syntax - or just create another configuration file so that the second broker uses a different directory.</p> |
| |
| <p>Another cause of this problem is if you are using the vm://localhost style transport in a JMS client with the JMS connection starting before you have initialised your broker. If you create a vm transport connection, it will auto-create a broker if there is not one running already; so you can end up creating 2 brokers by accident. The work around is to make sure that the JMS connection factory you are using depends on the broker you are configuring (e.g. in Spring use a <strong>depends-on</strong> attribute on the connection factory to make it depend on the broker). This will ensure that the broker is initialized first before the connection factory.</p> |
| |
| <p>Be careful with broker names and URIs</p> |
| |
| <p>Make sure you do not use any strange characters in the names of brokers as they are converted to URIs which <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/net/URI.html">do not allow things like underscores</a> in them etc.</p> |
| |
| <p>This problem could also be caused by <a href="the-broker-will-not-start">a bad OS and JVM combination</a></p> |
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