## MBeans Descriptors How To

### Table of Contents

- Introduction
- Adding MBean descriptions

### 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>