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All,
I'm trying to write my own MBean, and I have it working: the bean is
registered and I can browse it using jconsole, etc., call methods, etc.
At one point during the process, I believe I had the
beans-descriptors.xml file actually being loaded, so that my
customized descriptions of attributes and methods were being shown in
jconsole.
At some point, I changed something and they are no longer showing up.
It looks like I'm getting an introspected MBean description instead of
the declared one I want. All the attributes for example are described
as "Attribute exposed for management".
I've set org.apache.tomcat.util.modeler.level=ALL and the same for the
Console logger, so I'm getting a steady stream of output from the
modeler package, including a whole bunch of messages like this:
FINER [main] org.apache.tomcat.util.modeler.Registry.loadDescriptors
Finding descriptor org/apache/catalina/authenticator
Great. What I don't see is a similar message for my own MBean. It
doesn't look like Tomcat is ever trying to load the
mbeans-descriptors.xml file for my MBean.
Here's what I've got:
0. Tomcat 8.0-trunk
1. A JAR file in CATALINA_BASE/lib containing my MBean interface,
class, and mbeans-descriptors.xml, all in the same package
(imaginatively called "mbeans"), and a Filter class that creates the
bean and registers it with the MBean server.
2. The Tomcat "examples" webapp, with modifications to WEB-INF/web.xml
to load the aforementioned Filter.
Here's the whole mbeans-descriptors.xml file:
<?xml version="1.0"?>
<mbeans-descriptors>
<mbean name="RequestStats"
className="org.apache.catalina.mbeans.ClassNameMBean"
description="Server statistics and configuration"
domain="Catalina"
type="mbeans.RequestStats">
<attribute name="className"
description="Fully qualified class name of the managed
object"
type="java.lang.String"
writeable="false"/>
<operation name="getProcessingTime"
description="Gets the total number of milliseconds
spent processing requests."
impact="INFO"
returnType="long">
</operation>
<operation name="getRequestCount"
description="Gets the total number of requests processed."
impact="INFO"
returnType="long">
</operation>
<operation name="resetCounters"
description="Resets all counters."
impact="ACTION"
returnType="void">
</operation>
</mbean>
</mbeans-descriptors>
I realize that two of the "operations" should probably be "attributes"
instead, but it was about the time I changed from "operation" to
"attribute" that things stopped working, so I rolled-back my changes a
bit to back-track.
Here's the contents of my mbean-example.jar file:
Archive: mbeans-example.jar
Length Method Size Ratio Date Time CRC-32 Name
- -------- ------ ------- ----- ---- ---- ------ ----
0 Stored 0 0% 03-19-14 12:19 00000000 META-INF/
103 Defl:N 90 13% 03-19-14 12:19 d2b59077
META-INF/MANIFEST.MF
0 Stored 0 0% 03-19-14 11:57 00000000 filters/
0 Stored 0 0% 03-19-14 11:57 00000000 mbean/
2387 Defl:N 1196 50% 03-19-14 12:19 2d7e415d
filters/RequestStatsFilter.class
714 Defl:N 436 39% 03-19-14 11:57 7bdf9245
mbean/RequestStats.class
165 Defl:N 138 16% 03-19-14 11:57 041e1c7f
mbean/RequestStatsMBean.class
1058 Defl:N 390 63% 03-19-14 12:19 ba6ca9b6
mbean/mbeans-descriptors.xml
I can't see to find the text "mbean.Request" anywhere in the log
files. I've become desperate and set org.apache.tomcat.level=ALL and
org.apache.catalina.level=ALL to see if I can find anything.
Can anyone shed some light on why my mbeans-descriptors.xml file isn't
being loaded -- or even looked-for?
- -chris
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