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     Apache ActiveMQ &#8482; -- Journal is already opened by this application
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 <div class="wiki-content maincontent"><h3 id="Journalisalreadyopenedbythisapplication-Error">Error</h3>

 <p>You get something like this</p>

 <div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
 <pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
 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.&lt;init&gt;(LogFileManager.java:101)
        at
 org.apache.activeio.journal.active.JournalImpl.&lt;init&gt;(JournalImpl.java:99)
        at
 org.apache.activemq.store.DefaultPersistenceAdapterFactory.createJournal(DefaultPersistenceAdapterFactory.java:198)
        at
 org.apache.activemq.store.DefaultPersistenceAdapterFactory.getJournal(DefaultPersistenceAdapterFactory.java:134)
 </pre>
 </div></div>

 <h3 id="Journalisalreadyopenedbythisapplication-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>

 <div class="confluence-information-macro confluence-information-macro-warning"><p class="title">Be careful with broker names and URIs</p><span class="aui-icon aui-icon-small aui-iconfont-error confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
 <p>Make sure you do not use any strange characters in the names of brokers as they are converted to URIs which <a shape="rect" class="external-link" href="http://java.sun.com/j2se/1.4.2/docs/api/java/net/URI.html" rel="nofollow">do not allow things like underscores</a> in them etc.</p></div></div>

 <p>This problem could also be caused by <a shape="rect" href="the-broker-will-not-start.html">a bad OS and JVM combination</a></p></div>
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	<div class="wiki-content maincontent"><h3 id="Journalisalreadyopenedbythisapplication-Error">Error</h3>

	<p>You get something like this</p>

	<div class="code panel pdl" style="border-width: 1px;"><div class="codeContent panelContent pdl">
	<pre class="brush: java; gutter: false; theme: Default" style="font-size:12px;">
	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)
	</pre>
	</div></div>

	<h3 id="Journalisalreadyopenedbythisapplication-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>

	<div class="confluence-information-macro confluence-information-macro-warning"><p class="title">Be careful with broker names and URIs</p><span class="aui-icon aui-icon-small aui-iconfont-error confluence-information-macro-icon"></span><div class="confluence-information-macro-body">
	<p>Make sure you do not use any strange characters in the names of brokers as they are converted to URIs which <a shape="rect" class="external-link" href="http://java.sun.com/j2se/1.4.2/docs/api/java/net/URI.html" rel="nofollow">do not allow things like underscores</a> in them etc.</p></div></div>

	<p>This problem could also be caused by <a shape="rect" href="the-broker-will-not-start.html">a bad OS and JVM combination</a></p></div>
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