Hi!
I didn't find any way do detect deadlocks on JBoss but you can change your
jboss.xml to tell JBoss which methods do not need an EJB lock.
In each <entity> entry in jboss.xml file, do the following change (in this
example, get* methods are read-only):
<entity>
<ejb-name>Role</ejb-name>
<local-jndi-name>ejb/webflow/local/Role</local-jndi-name>
<!-- this tells JBoss that the get* methods are read-only -->
<method-attributes>
<method>
<method-name>get*</method-name>
<read-only>true</read-only>
</method>
</method-attributes>
</entity>
I didn't find any XDoclet @tag to do this but I coded a XSLT transform:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="@*|node()">
<xsl:copy>
<xsl:apply-templates select="@*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="entity">
<xsl:copy>
<xsl:apply-templates/>
<method-attributes>
<method>
<method-name>get*</method-name>
<read-only>true</read-only>
</method>
</method-attributes>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
If you are using ant to build your project do something like this:
<xslt in="${original.jboss.xml}" out="${modified.jboss.xml}"
style="${location.of.xslt.above}">
<outputproperty name="method" value="xml"/>
<outputproperty name="standalone" value="yes"/>
<outputproperty name="encoding" value="iso8859_1"/>
<outputproperty name="indent" value="yes"/>
<xmlcatalog>
<dtd publicId="-//JBoss//DTD JBOSS 3.0//EN"
location="${location.of.jboss.xml.dtd}"/>
</xmlcatalog>
</xslt>
The <xmlcatalog> tag above is optional. It's included here just to avoid a
remote connection for the xml validation.
I hope this helps.
Greetings from Brazil!
Mauricio
----- Original Message -----
From: "Hunter Hillegas" <[EMAIL PROTECTED]>
To: "JBoss User" <[EMAIL PROTECTED]>
Sent: Sunday, March 02, 2003 5:00 PM
Subject: [JBoss-user] Deadlocks
> I am seeing some deadlocks in a CMP 2.0 app that I recently put into
> production on JBoss 3.0.4.
>
> 90% of my access with the entities is read only.
>
> What can I do to troubleshoot/track down these deadlocks and fix them?
>
> Any help is appreciated.
>
> Thanks,
> Hunter
>
>
>
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