<div dir="ltr"><div><div><div>Dear reader,<br><br></div>We recently moved to Wildfly 9.0.1.Final (from 8.2.0) for testing and stumbled upon a bug regarding expression evaluation in the standalone*.xml.<br><br></div>Let me give an example for the following subsystem:<br><br><span style="font-family:monospace,monospace"><subsystem xmlns="urn:jboss:domain:jgroups:3.0"><br> <channels default="ee"><br> <channel name="ee"/><br> </channels><br> ...<br></span></div><span style="font-family:monospace,monospace"></subsytem></span> <br><div><div><br></div><div>Since we have several deployment stages on one physical server we need to separate the clusters by using a distinct name for each one of the stages deployed. Hence we introduced a startup property to be substituted in the standalone*.xml configuration like following snippet clarifies:<br><br><span style="font-family:monospace,monospace"><subsystem xmlns="urn:jboss:domain:jgroups:3.0"><br> <channels default="${custom_clustername:ee}"><br> <channel name="${custom_clustername:ee}"/><br> </channels><br> ...<br></subsytem></span><br><br></div><div>Using this approach however fails to start the container because the channels default attribute is properly evaluated to <span style="font-family:monospace,monospace">"ee"</span> (accoding to specs). However the channel name attribute is not evaluated at all and is registered as <span style="font-family:monospace,monospace">"${custom_clustername:ee}" </span>(without the quotes). <br><br></div><div>I took the liberty to dig in the class: <span style="font-family:monospace,monospace">org.jboss.as.clustering.jgroups.subsystem.JGroupsSubsystemXMLReader</span> and manually do the expression evaluation for the channel name. At first glance this seems to work however the container rewrites the standalone*.xml file at a certain moment resulting in this snippet:<br><br><span style="font-family:monospace,monospace"><subsystem xmlns="urn:jboss:domain:jgroups:3.0"><br> <channels default="${custom_clustername:ee}"><br> <channel name="ee"/><br> </channels><br> ...<br></subsytem><br><br></span></div><div>Which on subsequent container starts and when using the -D<span style="font-family:monospace,monospace">custom_clustername=whee </span><span style="font-family:arial,helvetica,sans-serif">startup property causes a problem because the channels default is evaluated to <span style="font-family:monospace,monospace">"whee"</span> and the channel name remains <span style="font-family:monospace,monospace">"ee"</span>.</span><span style="font-family:monospace,monospace"><br><br></span><span style="font-family:monospace,monospace"><br></span></div><div>So my questions are:<br><br>1] How to solve this issue in a correct way? <br>2] Can somebody provide another mechanism to configure a non default channel name on startup? <br></div><div><br><br>-- <br><div class="gmail_signature"><div dir="ltr"><div>Best regards,<br>
<br>
<b>Dennis Brouwer</b><br>
Extraordinary Goalkeeper<br><br><br>
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