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MBeans Descriptors How To

Table of Contents

Introduction

Tomcat uses JMX MBeans as the technology for implementing manageability of Tomcat.

The descriptions of JMX MBeans for Catalina are in the mbeans-descriptors.xml file in each package.

You will need to add MBean descriptions for your custom components in order to avoid a "ManagedBean is not found" exception.

Adding MBean descriptions

You may also add MBean descriptions for custom components in an mbeans-descriptors.xml file, located in the same package as the class files it describes.

The permitted syntax for the mbeans-descriptors.xml is defined by the DTD file.

The entries for a custom LDAP authentication Realm may look like this:

  <mbean         name="LDAPRealm"
            className="org.apache.catalina.mbeans.ClassNameMBean"
          description="Custom LDAPRealm"
               domain="Catalina"
                group="Realm"
                 type="com.myfirm.mypackage.LDAPRealm">

    <attribute   name="className"
          description="Fully qualified class name of the managed object"
                 type="java.lang.String"
            writeable="false"/>

    <attribute   name="debug"
          description="The debugging detail level for this component"
                 type="int"/>
    .
    .
    .

  </mbean>