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<!DOCTYPE document [
<!ENTITY project SYSTEM "project.xml">
]>
<document url="monitoring.html">
&project;
<properties>
<title>Monitoring and Managing Tomcat</title>
</properties>
<body>
<section name="Table of Contents">
<toc/>
</section>
<section name="Introduction">
<p>Monitoring is a key aspect of system administration. Looking inside a
running server, obtaining some statistics or reconfiguring some aspects of
an application are all daily administration tasks.</p>
</section>
<section name="Enabling JMX Remote">
<p><strong>Note:</strong> This configuration is needed only if you are
going to monitor Tomcat remotely. It is not needed if you are going
to monitor it locally, using the same user that Tomcat runs with.</p>
<p>The Oracle website includes the list of options and how to configure
JMX Remote on Java 11:
<a href="https://docs.oracle.com/en/java/javase/11/management/monitoring-and-management-using-jmx-technology.html">
http://docs.oracle.com/javase/6/docs/technotes/guides/management/agent.html</a>.
</p>
<p>The following is a quick configuration guide for Java 11:</p>
<p>Add the following parameters to <code>setenv.bat</code> script of your
Tomcat (see <a href="RUNNING.txt">RUNNING.txt</a> for details).<br/>
<em>Note:</em> This syntax is for Microsoft Windows. The command has
to be on the same line. It is wrapped to be more readable. If Tomcat is
running as a Windows service, use its configuration dialog to set
java options for the service.
For Linux, MacOS, etc, remove <code>"set "</code> from beginning of the
line.
</p>
<source><![CDATA[set CATALINA_OPTS=-Dcom.sun.management.jmxremote.port=%my.jmx.port%
-Dcom.sun.management.jmxremote.rmi.port=%my.rmi.port%
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false]]></source>
<p>If you don't set com.sun.management.jmxremote.rmi.port then the
JSR 160 JMX-Adaptor will select a port at random which will may it difficult to
configure a firewall to allow access.</p>
<p>If you require TLS:</p>
<ol>
<li>change and add this:
<source><![CDATA[ -Dcom.sun.management.jmxremote.ssl=true
-Dcom.sun.management.jmxremote.registry.ssl=true
]]></source></li>
<li>to configure the protocols and/or cipher suites use:
<source><![CDATA[ -Dcom.sun.management.jmxremote.ssl.enabled.protocols=%my.jmx.ssl.protocols%
-Dcom.sun.management.jmxremote.ssl.enabled.cipher.suites=%my.jmx.cipher.suites%
]]></source></li>
<li>to client certificate authentication use:
<source><![CDATA[ -Dcom.sun.management.jmxremote.ssl.need.client.auth=%my.jmx.ssl.clientauth%]]></source></li>
</ol>
<p>If you require authorization (it is strongly recommended that TLS is always
used with authentication):</p>
<ol>
<li>change and add this:
<source><![CDATA[ -Dcom.sun.management.jmxremote.authenticate=true
-Dcom.sun.management.jmxremote.password.file=../conf/jmxremote.password
-Dcom.sun.management.jmxremote.access.file=../conf/jmxremote.access]]></source>
</li>
<li>edit the access authorization file <em>$CATALINA_BASE/conf/jmxremote.access</em>:
<source><![CDATA[monitorRole readonly
controlRole readwrite]]></source>
</li>
<li>edit the password file <em>$CATALINA_BASE/conf/jmxremote.password</em>:
<source><![CDATA[monitorRole tomcat
controlRole tomcat]]></source>
<b>Tip</b>: The password file should be read-only and only accessible by the
operating system user Tomcat is running as.
</li>
<li>Alternatively, you can configure a JAAS login module with:
<source><![CDATA[ -Dcom.sun.management.jmxremote.login.config=%login.module.name%]]></source></li>
</ol>
<p>If you need to specify a host name to be used in the RMI stubs sent to the
client (e.g. because the public host name that must be used to connect is not
the same as the local host name) then you can set:</p>
<source><![CDATA[set CATALINA_OPTS=-Djava.rmi.server.hostname]]></source>
<p>If you need to specify a specific interface for the JMX service to bind to
then you can set:</p>
<source><![CDATA[set CATALINA_OPTS=-Dcom.sun.management.jmxremote.host]]></source>
</section>
<section name="Manage Tomcat with JMX remote Ant Tasks">
<p>To simplify JMX usage with Ant, a set of tasks is provided that may
be used with antlib.</p>
<p><b>antlib</b>: Copy your catalina-ant.jar from $CATALINA_HOME/lib to $ANT_HOME/lib.</p>
<p>The following example shows the JMX Accessor usage:<br/>
<em>Note:</em> The <code>name</code> attribute value was wrapped here to be
more readable. It has to be all on the same line, without spaces.</p>
<source><![CDATA[<project name="Catalina Ant JMX"
xmlns:jmx="antlib:org.apache.catalina.ant.jmx"
default="state"
basedir=".">
<property name="jmx.server.name" value="localhost" />
<property name="jmx.server.port" value="9012" />
<property name="cluster.server.address" value="192.168.1.75" />
<property name="cluster.server.port" value="9025" />
<target name="state" description="Show JMX Cluster state">
<jmx:open
host="${jmx.server.name}"
port="${jmx.server.port}"
username="controlRole"
password="tomcat"/>
<jmx:get
name=
"Catalina:type=IDataSender,host=localhost,
senderAddress=${cluster.server.address},senderPort=${cluster.server.port}"
attribute="connected"
resultproperty="IDataSender.backup.connected"
echo="false"
/>
<jmx:get
name="Catalina:type=ClusterSender,host=localhost"
attribute="senderObjectNames"
resultproperty="senderObjectNames"
echo="false"
/>
<!-- get current maxActiveSession from ClusterTest application
echo it to Ant output and store at
property <em>clustertest.maxActiveSessions.original</em>
-->
<jmx:get
name="Catalina:type=Manager,context=/ClusterTest,host=localhost"
attribute="maxActiveSessions"
resultproperty="clustertest.maxActiveSessions.original"
echo="true"
/>
<!-- set maxActiveSession to 100
-->
<jmx:set
name="Catalina:type=Manager,context=/ClusterTest,host=localhost"
attribute="maxActiveSessions"
value="100"
type="int"
/>
<!-- get all sessions and split result as delimiter <em>SPACE</em> for easy
access all session ids directly with Ant property sessions.[0..n].
-->
<jmx:invoke
name="Catalina:type=Manager,context=/ClusterTest,host=localhost"
operation="listSessionIds"
resultproperty="sessions"
echo="false"
delimiter=" "
/>
<!-- Access session attribute <em>Hello</em> from first session.
-->
<jmx:invoke
name="Catalina:type=Manager,context=/ClusterTest,host=localhost"
operation="getSessionAttribute"
resultproperty="Hello"
echo="false"
>
<arg value="${sessions.0}"/>
<arg value="Hello"/>
</jmx:invoke>
<!-- Query for all application manager.of the server from all hosts
and bind all attributes from all found manager MBeans.
-->
<jmx:query
name="Catalina:type=Manager,*"
resultproperty="manager"
echo="true"
attributebinding="true"
/>
<!-- echo the create properties -->
<echo>
senderObjectNames: ${senderObjectNames.0}
IDataSender.backup.connected: ${IDataSender.backup.connected}
session: ${sessions.0}
manager.length: ${manager.length}
manager.0.name: ${manager.0.name}
manager.1.name: ${manager.1.name}
hello: ${Hello}
manager.ClusterTest.0.name: ${manager.ClusterTest.0.name}
manager.ClusterTest.0.activeSessions: ${manager.ClusterTest.0.activeSessions}
manager.ClusterTest.0.counterSend_EVT_SESSION_EXPIRED:
${manager.ClusterTest.0.counterSend_EVT_SESSION_EXPIRED}
manager.ClusterTest.0.counterSend_EVT_GET_ALL_SESSIONS:
${manager.ClusterTest.0.counterSend_EVT_GET_ALL_SESSIONS}
</echo>
</target>
</project>]]></source>
<p><b>import:</b> Import the JMX Accessor Project with
<em><import file="${CATALINA.HOME}/bin/catalina-tasks.xml" /></em> and
reference the tasks with <em>jmxOpen</em>, <em>jmxSet</em>, <em>jmxGet</em>,
<em>jmxQuery</em>, <em>jmxInvoke</em>, <em>jmxEquals</em> and <em>jmxCondition</em>.</p>
</section>
<!-- Open #########################################################################
-->
<section name="JMXAccessorOpenTask - JMX open connection task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>url</td>
<td>Set JMX connection URL - <em>service:jmx:rmi:///jndi/rmi://localhost:8050/jmxrmi</em>
</td>
<td></td>
</tr>
<tr>
<td>host</td>
<td>Set the host, shortcut the very long URL syntax.
</td>
<td><code class="noHighlight">localhost</code></td>
</tr>
<tr>
<td>port</td>
<td>Set the remote connection port
</td>
<td><code class="noHighlight">8050</code></td>
</tr>
<tr>
<td>username</td>
<td>remote JMX connection user name.
</td>
<td></td>
</tr>
<tr>
<td>password</td>
<td>remote JMX connection password.
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>Name of the internal connection reference. With this attribute you can
configure more the one connection inside the same Ant project.
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo the command usage (for access analysis or debugging)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>if</td>
<td>Only execute if a property of the given name <b>exists</b> in the current project.
</td>
<td></td>
</tr>
<tr>
<td>unless</td>
<td>Only execute if a property of the given name <b>not exists</b> in the current project.
</td>
<td></td>
</tr>
</table>
<p>
Example to open a new JMX connection
</p>
<source><![CDATA[ <jmx:open
host="${jmx.server.name}"
port="${jmx.server.port}"
/>]]></source>
<p>
Example to open a JMX connection from URL, with authorization and
store at other reference
</p>
<source><![CDATA[ <jmx:open
url="service:jmx:rmi:///jndi/rmi://localhost:9024/jmxrmi"
ref="jmx.server.9024"
username="controlRole"
password="tomcat"
/>]]></source>
<p>
Example to open a JMX connection from URL, with authorization and
store at other reference, but only when property <em>jmx.if</em> exists and
<em>jmx.unless</em> not exists
</p>
<source><![CDATA[ <jmx:open
url="service:jmx:rmi:///jndi/rmi://localhost:9024/jmxrmi"
ref="jmx.server.9024"
username="controlRole"
password="tomcat"
if="jmx.if"
unless="jmx.unless"
/>]]></source>
<p><b>Note</b>: All properties from <em>jmxOpen</em> task also exists at all
other tasks and conditions.
</p>
</section>
<!-- Get #########################################################################
-->
<section name="JMXAccessorGetTask: get attribute value Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=Server</em>
</td>
<td></td>
</tr>
<tr>
<td>attribute</td>
<td>Existing MBean attribute (see Tomcat MBean description above)
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>resultproperty</td>
<td>Save result at this project property
</td>
<td></td>
</tr>
<tr>
<td>delimiter</td>
<td>Split result with delimiter (java.util.StringTokenizer)
and use resultproperty as prefix to store tokens.
</td>
<td></td>
</tr>
<tr>
<td>separatearrayresults</td>
<td>When return value is an array, save result as property list
(<em>$resultproperty.[0..N]</em> and <em>$resultproperty.length</em>)
</td>
<td><code class="noHighlight">true</code></td>
</tr>
</table>
<p>
Example to get remote MBean attribute from default JMX connection
</p>
<source><![CDATA[ <jmx:get
name="Catalina:type=Manager,context=/servlets-examples,host=localhost"
attribute="maxActiveSessions"
resultproperty="servlets-examples.maxActiveSessions"
/>]]></source>
<p>
Example to get and result array and split it at separate properties
</p>
<source><![CDATA[ <jmx:get
name="Catalina:type=ClusterSender,host=localhost"
attribute="senderObjectNames"
resultproperty="senderObjectNames"
/>]]></source>
<p>
Access the senderObjectNames properties with:
</p>
<source><![CDATA[ ${senderObjectNames.length} give the number of returned sender list.
${senderObjectNames.[0..N]} found all sender object names]]></source>
<p>
Example to get IDataSender attribute connected only when cluster is configured.<br/>
<em>Note:</em> The <code>name</code> attribute value was wrapped here to be
more readable. It has to be all on the same line, without spaces.
</p>
<source><![CDATA[
<jmx:query
failonerror="false"
name="Catalina:type=Cluster,host=${tomcat.application.host}"
resultproperty="cluster"
/>
<jmx:get
name=
"Catalina:type=IDataSender,host=${tomcat.application.host},
senderAddress=${cluster.backup.address},senderPort=${cluster.backup.port}"
attribute="connected"
resultproperty="datasender.connected"
if="cluster.0.name" />]]></source>
</section>
<!-- Set #########################################################################
-->
<section name="JMXAccessorSetTask: set attribute value Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=Server</em>
</td>
<td></td>
</tr>
<tr>
<td>attribute</td>
<td>Existing MBean attribute (see Tomcat MBean description above)
</td>
<td></td>
</tr>
<tr>
<td>value</td>
<td>value that set to attribute
</td>
<td></td>
</tr>
<tr>
<td>type</td>
<td>type of the attribute.
</td>
<td><code class="noHighlight">java.lang.String</code></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
</table>
<p>
Example to set remote MBean attribute value
</p>
<source><![CDATA[ <jmx:set
name="Catalina:type=Manager,context=/servlets-examples,host=localhost"
attribute="maxActiveSessions"
value="500"
type="int"
/>]]></source>
</section>
<!-- Invoke #########################################################################
-->
<section name="JMXAccessorInvokeTask: invoke MBean operation Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=Server</em>
</td>
<td></td>
</tr>
<tr>
<td>operation</td>
<td>Existing MBean operation
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>resultproperty</td>
<td>Save result at this project property
</td>
<td></td>
</tr>
<tr>
<td>delimiter</td>
<td>Split result with delimiter (java.util.StringTokenizer)
and use resultproperty as prefix to store tokens.
</td>
<td></td>
</tr>
<tr>
<td>separatearrayresults</td>
<td>When return value is an array, save result as property list
(<em>$resultproperty.[0..N]</em> and <em>$resultproperty.length</em>)
</td>
<td><code class="noHighlight">true</code></td>
</tr>
</table>
<p>
stop an application
</p>
<source><![CDATA[ <jmx:invoke
name="Catalina:type=Manager,context=/servlets-examples,host=localhost"
operation="stop"/>]]></source>
<p>
Now you can find the sessionid at <em>${sessions.[0..N}</em> properties and access the count
with ${sessions.length} property.
</p>
<p>
Example to get all sessionids
</p>
<source><![CDATA[ <jmx:invoke
name="Catalina:type=Manager,context=/servlets-examples,host=localhost"
operation="listSessionIds"
resultproperty="sessions"
delimiter=" "
/>]]></source>
<p>
Now you can find the sessionid at <em>${sessions.[0..N}</em> properties and access the count
with ${sessions.length} property.
</p>
<p>
Example to get remote MBean session attribute from session ${sessionid.0}
</p>
<source><![CDATA[ <jmx:invoke
name="Catalina:type=Manager,context=/ClusterTest,host=localhost"
operation="getSessionAttribute"
resultproperty="hello">
<arg value="${sessionid.0}"/>
<arg value="Hello" />
</jmx:invoke>]]></source>
<p>
Example to create a new access logger valve at vhost <em>localhost</em>
</p>
<source><![CDATA[ <jmx:invoke
name="Catalina:type=MBeanFactory"
operation="createAccessLoggerValve"
resultproperty="accessLoggerObjectName"
>
<arg value="Catalina:type=Host,host=localhost"/>
</jmx:invoke>]]></source>
<p>
Now you can find new MBean with name stored at <em>${accessLoggerObjectName}</em>
property.
</p>
</section>
<!-- Query #########################################################################
-->
<section name="JMXAccessorQueryTask: query MBean Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>JMX ObjectName query string -- <em>Catalina:type=Manager,*</em>
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>resultproperty</td>
<td>Prefix project property name to all founded MBeans (<em>mbeans.[0..N].objectname</em>)
</td>
<td></td>
</tr>
<tr>
<td>attributebinding</td>
<td>bind ALL MBean attributes in addition to <em>name</em>
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>delimiter</td>
<td>Split result with delimiter (java.util.StringTokenizer)
and use resultproperty as prefix to store tokens.
</td>
<td></td>
</tr>
<tr>
<td>separatearrayresults</td>
<td>When return value is an array, save result as property list
(<em>$resultproperty.[0..N]</em> and <em>$resultproperty.length</em>)
</td>
<td><code class="noHighlight">true</code></td>
</tr>
</table>
<p>
Get all Manager ObjectNames from all services and Hosts
</p>
<source><![CDATA[ <jmx:query
name="Catalina:type=Manager,*
resultproperty="manager" />]]></source>
<p>
Now you can find the Session Manager at <em>${manager.[0..N].name}</em>
properties and access the result object counter with ${manager.length} property.
</p>
<p>
Example to get the Manager from <em>servlet-examples</em> application an bind all MBean properties
</p>
<source><![CDATA[ <jmx:query
name="Catalina:type=Manager,context=/servlet-examples,host=localhost*"
attributebinding="true"
resultproperty="manager.servletExamples" />]]></source>
<p>
Now you can find the manager at <em>${manager.servletExamples.0.name}</em> property
and can access all properties from this manager with <em>${manager.servletExamples.0.[manager attribute names]</em>}.
The result object counter from MBeans is stored ad ${manager.length} property.
</p>
<p>
Example to get all MBeans from a server and store inside an external XML property file
</p>
<source><![CDATA[<project name="jmx.query"
xmlns:jmx="antlib:org.apache.catalina.ant.jmx"
default="query-all" basedir=".">
<property name="jmx.host" value="localhost"/>
<property name="jmx.port" value="8050"/>
<property name="jmx.username" value="controlRole"/>
<property name="jmx.password" value="tomcat"/>
<target name="query-all" description="Query all MBeans of a server">
<!-- Configure connection -->
<jmx:open
host="${jmx.host}"
port="${jmx.port}"
ref="jmx.server"
username="${jmx.username}"
password="${jmx.password}"/>
<!-- Query MBean list -->
<jmx:query
name="*:*"
resultproperty="mbeans"
attributebinding="false"/>
<echoproperties
destfile="mbeans.properties"
prefix="mbeans."
format="xml"/>
<!-- Print results -->
<echo message=
"Number of MBeans in server ${jmx.host}:${jmx.port} is ${mbeans.length}"/>
</target>
</project>]]></source>
<p>
Now you can find all MBeans inside the file <em>mbeans.properties</em>.
</p>
</section>
<!-- Create #########################################################################
-->
<section name="JMXAccessorCreateTask: remote create MBean Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=MBeanFactory</em>
</td>
<td></td>
</tr>
<tr>
<td>className</td>
<td>Existing MBean full qualified class name (see Tomcat MBean description above)
</td>
<td></td>
</tr>
<tr>
<td>classLoader</td>
<td>ObjectName of server or web application classloader <br/>
( <em>Catalina:type=ServerClassLoader,name=[server,common,shared]</em> or<br/>
<em>Catalina:type=WebappClassLoader,context=/myapps,host=localhost</em>)
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
</table>
<p>
Example to create remote MBean
</p>
<source><![CDATA[ <jmx:create
ref="${jmx.reference}"
name="Catalina:type=MBeanFactory"
className="org.apache.commons.modeler.BaseModelMBean"
classLoader="Catalina:type=ServerClassLoader,name=server">
<arg value="org.apache.catalina.mbeans.MBeanFactory" />
</jmx:create>]]></source>
<p>
<b>Warning</b>: Many Tomcat MBeans can't be linked to their parent once
created. The Valve, Cluster and Realm MBeans are not automatically<br/>
connected with their parent. Use the <em>MBeanFactory</em> create<br/>
operation instead.
</p>
</section>
<!-- Unregister #########################################################################
-->
<section name="JMXAccessorUnregisterTask: remote unregister MBean Ant task">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=MBeanFactory</em>
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>JMX Connection reference
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>echo</td>
<td>Echo command usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
</table>
<p>
Example to unregister remote MBean
</p>
<source><![CDATA[ <jmx:unregister
name="Catalina:type=MBeanFactory"
/>]]></source>
<p>
<b>Warning</b>: A lot of Tomcat MBeans can't be unregister.
The MBeans are not unlinked from their parent. Use <em>MBeanFactory</em><br/>
remove operation instead.
</p>
</section>
<!-- condition #########################################################################
-->
<section name="JMXAccessorCondition: express condition">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>url</td>
<td>Set JMX connection URL - <em>service:jmx:rmi:///jndi/rmi://localhost:8050/jmxrmi</em>
</td>
<td></td>
</tr>
<tr>
<td>host</td>
<td>Set the host, shortcut the very long URL syntax.
</td>
<td><code class="noHighlight">localhost</code></td>
</tr>
<tr>
<td>port</td>
<td>Set the remote connection port
</td>
<td><code class="noHighlight">8050</code></td>
</tr>
<tr>
<td>username</td>
<td>remote JMX connection user name.
</td>
<td></td>
</tr>
<tr>
<td>password</td>
<td>remote JMX connection password.
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>Name of the internal connection reference. With this attribute you can
configure more the one connection inside the same Ant project.
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=Server</em>
</td>
<td></td>
</tr>
<tr>
<td>echo</td>
<td>Echo condition usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
<tr>
<td>if</td>
<td>Only execute if a property of the given name <b>exists</b> in the current project.
</td>
<td></td>
</tr>
<tr>
<td>unless</td>
<td>Only execute if a property of the given name <b>not exists</b> in the current project.
</td>
<td></td>
</tr>
<tr>
<td>value (required)</td>
<td>Second arg for operation
</td>
<td></td>
</tr>
<tr>
<td>type</td>
<td>Value type to express operation (support <em>long</em> and <em>double</em>)
</td>
<td><code class="noHighlight">long</code></td>
</tr>
<tr>
<td>operation</td>
<td> express one
<ul>
<li>== equals</li>
<li>!= not equals</li>
<li>> greater than (>)</li>
<li>>= greater than or equals (>=)</li>
<li>< lesser than (<)</li>
<li><= lesser than or equals (<=)</li>
</ul>
</td>
<td><code class="noHighlight">==</code></td>
</tr>
</table>
<p>
Wait for server connection and that cluster backup node is accessible
</p>
<source><![CDATA[<target name="wait">
<waitfor maxwait="${maxwait}" maxwaitunit="second" timeoutproperty="server.timeout" >
<and>
<socket server="${server.name}" port="${server.port}"/>
<http url="${url}"/>
<jmx:condition
operation="=="
host="localhost"
port="9014"
username="controlRole"
password="tomcat"
name=
"Catalina:type=IDataSender,host=localhost,senderAddress=192.168.111.1,senderPort=9025"
attribute="connected"
value="true"
/>
</and>
</waitfor>
<fail if="server.timeout" message="Server ${url} don't answer inside ${maxwait} sec" />
<echo message="Server ${url} alive" />
</target>]]></source>
</section>
<!-- Equals #########################################################################
-->
<section name="JMXAccessorEqualsCondition: equals MBean Ant condition">
<p>
List of Attributes
</p>
<table class="defaultTable">
<tr>
<th>Attribute</th>
<th>Description</th>
<th>Default value</th>
</tr>
<tr>
<td>url</td>
<td>Set JMX connection URL - <em>service:jmx:rmi:///jndi/rmi://localhost:8050/jmxrmi</em>
</td>
<td></td>
</tr>
<tr>
<td>host</td>
<td>Set the host, shortcut the very long URL syntax.
</td>
<td><code class="noHighlight">localhost</code></td>
</tr>
<tr>
<td>port</td>
<td>Set the remote connection port
</td>
<td><code class="noHighlight">8050</code></td>
</tr>
<tr>
<td>username</td>
<td>remote JMX connection user name.
</td>
<td></td>
</tr>
<tr>
<td>password</td>
<td>remote JMX connection password.
</td>
<td></td>
</tr>
<tr>
<td>ref</td>
<td>Name of the internal connection reference. With this attribute you can
configure more the one connection inside the same Ant project.
</td>
<td><code class="noHighlight">jmx.server</code></td>
</tr>
<tr>
<td>name</td>
<td>Full qualified JMX ObjectName -- <em>Catalina:type=Server</em>
</td>
<td></td>
</tr>
<tr>
<td>echo</td>
<td>Echo condition usage (access and result)
</td>
<td><code class="noHighlight">false</code></td>
</tr>
</table>
<p>
Wait for server connection and that cluster backup node is accessible
</p>
<source><![CDATA[<target name="wait">
<waitfor maxwait="${maxwait}" maxwaitunit="second" timeoutproperty="server.timeout" >
<and>
<socket server="${server.name}" port="${server.port}"/>
<http url="${url}"/>
<jmx:equals
host="localhost"
port="9014"
username="controlRole"
password="tomcat"
name=
"Catalina:type=IDataSender,host=localhost,senderAddress=192.168.111.1,senderPort=9025"
attribute="connected"
value="true"
/>
</and>
</waitfor>
<fail if="server.timeout" message="Server ${url} don't answer inside ${maxwait} sec" />
<echo message="Server ${url} alive" />
</target>]]></source>
</section>
<section name="Using the JMXProxyServlet">
<p>
Tomcat offers an alternative to using remote (or even local) JMX
connections while still giving you access to everything JMX has to offer:
Tomcat's
<a href="api/org/apache/catalina/manager/JMXProxyServlet.html">JMXProxyServlet</a>.
</p>
<p>
The JMXProxyServlet allows a client to issue JMX queries via an HTTP
interface. This technique offers the following advantages over using
JMX directly from a client program:
</p>
<ul>
<li>You don't have to launch a full JVM and make a remote JMX connection
just to ask for one small piece of data from a running server</li>
<li>You don't have to know how to work with JMX connections
<li>You don't need any of the complex configuration covered in the rest
of this page</li>
<li>Your client program does not have to be written in Java</li>
</ul>
<p>
A perfect example of JMX overkill can be seen in the case of popular
server-monitoring software such as Nagios or Icinga: if you want to
monitor 10 items via JMX, you will have to launch 10 JVMs, make 10 JMX
connections, and then shut them all down every few minutes. With the
JMXProxyServlet, you can make 10 HTTP connections and be done with it.
</p>
<p>
You can find out more information about the JMXProxyServlet in the
documentation for the
<a href="manager-howto.html#Using_the_JMX_Proxy_Servlet">Tomcat
manager</a>.
</p>
</section>
</body>
</document>
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