{"id":26538,"date":"2014-06-14T15:00:47","date_gmt":"2014-06-14T12:00:47","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/?p=26538"},"modified":"2014-06-13T14:21:50","modified_gmt":"2014-06-13T11:21:50","slug":"apache-ant-tasks-for-jmx-access","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2014\/06\/apache-ant-tasks-for-jmx-access.html","title":{"rendered":"Apache Ant tasks for JMX access"},"content":{"rendered":"

I wanted to invoke JMX operations from the Ant tasks. However finding usable ant tasks library as well as the usage was rather tricky. So let me share my experience to make things easier for others.<\/p>\n

Ant tasks for JMX operations<\/h2>\n

I decided to follow Tomcat documentation<\/a> and used ant tasks distributed with tomcat.<\/p>\n

Just for the record the usage is not restricted to Tomcat deployed JMX mBeans<\/strong>. For me it worked for java process accessible via JConsole via Remote connection.<\/p>\n

Retrieving the library<\/h2>\n
    \n
  1. As I wanted to get the latest version I used maven central repository \u201csearch by classname\u201d feature and searched for: org.apache.catalina.ant.jmx.JMXAccessorTask<\/code> (see the query<\/a>)<\/li>\n
  2. afterwards I went for the tomcat 8 jar file<\/a> (called tomcat-catalina-ant-8.0.8.jar<\/code>)<\/li>\n
  3. and just copyied the latest available to my $ANT_HOME\/lib<\/code> dir.<\/li>\n<\/ol>\n

    Usage<\/h2>\n

    I didn\u2019t have a chance (or motivation?) to check all the tasks available, the full list of tasks available can be seen in the zipped file: org\/apache\/catalina\/ant\/jmx\/antlib.xml<\/code>, following were present for me:<\/p>\n

    <typedef\r\n    name=\"open\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorTask\" \/>\r\n<typedef\r\n    name=\"set\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorSetTask\" \/>\r\n<typedef\r\n    name=\"get\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorGetTask\" \/>\r\n<typedef\r\n    name=\"invoke\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorInvokeTask\" \/>\r\n<typedef\r\n    name=\"query\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorQueryTask\" \/>\r\n<typedef\r\n    name=\"create\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorCreateTask\" \/>\r\n<typedef\r\n    name=\"unregister\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorUnregisterTask\" \/>\r\n<typedef\r\n    name=\"equals\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorEqualsCondition\" \/>\r\n<typedef\r\n    name=\"condition\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorCondition\" \/><\/pre>\n
    out of these, I gave following a try:
     
    <\/div> <\/div><\/p>\n
    org.apache.catalina.ant.jmx.JMXAccessorTask\r\norg.apache.catalina.ant.jmx.JMXAccessorInvokeTask\r\norg.apache.catalina.ant.jmx.JMXAccessorQueryTask<\/pre>\n
    For the demonstration purposes I\u2019m using Glassfish 4.0.<\/p>\n
    Example: Listing JMX MBeans<\/h2>\n
    Let\u2019s assume we want to retrieve the MBean by name (namely: java.lang:type=Memory<\/code>). Please note username and password were not required for access (otherwise they should be specified via respective properties).<\/p>\n
    Noteworthy here is the resultproperty<\/code>, which could hold array from which we could get a name. So having in ant build script:<\/p>\n
    <typedef \r\n    name=\"jmxQuery\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorQueryTask\" \/>\r\n\r\n<jmxQuery\r\n    host=\"localhost\"\r\n    port=\"8686\"\r\n    echo=\"true\"\r\n    name=\"java.lang:type=Memory\"\r\n    resultproperty=\"memory\" \/>\r\n\r\n<echo>Retrieved MBeans count: ${memory.Length}<\/echo>\r\n<echo>The 1.st one has name: ${memory.0.Name}<\/echo><\/pre>\n
    results for me in following output:<\/p>\n
    [jmxQuery] memory.Length=1\r\n [jmxQuery] memory.0.Name=java.lang:type=Memory\r\n     [echo] Retrieved MBeans count: 1\r\n     [echo] The 1.st one has name: java.lang:type=Memory<\/pre>\n
    Example: Invoking operation via JMX<\/h2>\n
    Here is a 2 step approach required:<\/p>\n
      \n
    1. connect to remote server via JMX and afterwards<\/li>\n
    2. invoke the operation on the particular MBean.<\/li>\n<\/ol>\n
      For demonstration purposes, let\u2019s assume we want to call garbage collection (via invoking operation: gc()<\/code> on MBean named: java.lang:type=Memory<\/code>)<\/p>\n
      Sample ant build file chunk does the job (please note ref<\/code> property value that has to be the same across these 2 tasks):<\/p>\n
      <typedef \r\n    name=\"jmxOpen\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorTask\" \/>\r\n\r\n<typedef \r\n    name=\"jmxInvoke\"\r\n    classname=\"org.apache.catalina.ant.jmx.JMXAccessorInvokeTask\" \/>\r\n\r\n<jmxOpen\r\n    host=\"localhost\"\r\n    port=\"8686\"\r\n    ref=\"glassfish\"\r\n    failOnError=\"true\" \/>\r\n\r\n<jmxInvoke\r\n    name=\"java.lang:type=Memory\"\r\n    operation=\"gc\"\r\n    echo=\"true\"\r\n    delimiter=\" \"\r\n    failOnError=\"true\"\r\n    ref=\"glassfish\" \/><\/pre>\n
      Further information<\/h2>\n
      For more details, I recommend reading the official Tomcat documentation<\/a> as well as Javadocs<\/a>.<\/p>\n
      \n\n\n\n
      Reference: <\/span><\/td>\nApache Ant tasks for JMX access<\/a> from our JCG partner<\/a> Peter Butkovic at the pb’s blog about life and IT<\/a> blog.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
      I wanted to invoke JMX operations from the Ant tasks. However finding usable ant tasks library as well as the usage was rather tricky. So let me share my experience to make things easier for others. Ant tasks for JMX operations I decided to follow Tomcat documentation and used ant tasks distributed with tomcat. Just …<\/p>\n","protected":false},"author":543,"featured_media":49,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[483,152],"class_list":["post-26538","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-apache-ant","tag-jmx"],"yoast_head":"\nApache Ant tasks for JMX access<\/title>\n<meta name=\"description\" content=\"I wanted to invoke JMX operations from the Ant tasks. However finding usable ant tasks library as well as the usage was rather tricky. 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