{"id":743,"date":"2010-05-14T23:45:25","date_gmt":"2010-05-14T18:15:25","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=743"},"modified":"2016-12-19T15:29:20","modified_gmt":"2016-12-19T09:59:20","slug":"embedding-jbpm-4-3-in-a-grails-1-2-2-application","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/embedding-jbpm-4-3-in-a-grails-1-2-2-application\/","title":{"rendered":"Embedding JBPM 4.3 in a Grails 1.2.2 Application"},"content":{"rendered":"

Hi,<\/p>\n

In one of our projects, we had a requirement for using some existing Business Process Management tool. JBPM is one such tool that we are evaluating.<\/p>\n

Our first step was to run a “Hello World” process from inside the grails application. On searching over the internet, I didn’t find any helpful article\/blog on integrating JBPM inside a grails application. However, there were some very good resources on integrating JBPM with a spring application. I found Joram Barrez’s Hello World Example<\/a> very helpful and was able to integrate using the following steps:<\/p>\n

    \n
  1. Download jbpm from here.<\/a><\/li>\n
  2. Unzip the contents and copy the jbpm.jar file to the lib directory of your application.\u00a0 The exploded directory has the following files\/ folders for version 4.3 : \"\"<\/a><\/li>\n
  3. Also copy the mail.jar from the jbpm installation directory (${jbpmHome}\/lib) to the lib directory of your application.<\/li>\n
  4. Create a process descriptor file in the conf directory (helloWorld.jpdl.xml) with the following code
    \n
    \n
    \r\n     \r\n     \r\n     \r\n     <\/start>\r\n     \r\n     \r\n          \r\n          \r\n     <\/java>\r\n     \r\n     \r\n     \r\n     \r\n     <\/state>\r\n    <\/process> \r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  5.  Create a class in src\/groovy
    \n
    \n
    package com.jbpm.example\r\n\r\nclass Printer {\r\n\r\n public void printHelloWorld() {\r\n   System.out.println(\"<---------------->\");\r\n   System.out.println(\"&nbsp;&nbsp; HELLO WORLD!\");\r\n   System.out.println(\"<---------------->\");\r\n }\r\n}\r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  6. Create a minimal jBPM config (jbpm.cfg.xml) in the conf directory
    \n
    \n
    \r\n     \r\n     \r\n     \r\n     \r\n    <\/jbpm-configuration>\r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  7. Create a basic Hibernate config called conf\/jbpm.hibernate.cfg.xml(I\u2019m using MySql, Still looking for a way on how to use the grails DataSource)
    \n
    \n
    \r\n    \r\n    \r\n    \r\n     \r\n     org.hibernate.dialect.MySQL5InnoDBDialect<\/property>\r\n     com.mysql.jdbc.Driver<\/property>\r\n     jdbc:mysql:\/\/localhost:3306\/testJbpm?autoReconnect=true<\/property>\r\n     username<\/property>\r\n     password<\/property>\r\n     \r\n     true<\/property>\r\n     update<\/property>\r\n     \r\n     \r\n     \r\n     \r\n     \r\n     \r\n     \r\n     <\/session-factory>\r\n    <\/hibernate-configuration>\r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  8. Create the following Spring beans is resources.groovy
    \n
    \n
        \r\nspringHelper(org.jbpm.pvm.internal.processengine.SpringHelper) {\r\n        jbpmCfg = \"jbpm.cfg.xml\"\r\n}\r\nprocessEngine(springHelper:\"createProcessEngine\")\r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  9. Now lets deploy this process. To deploy a process we will need to inject the processEngine bean
    \n
    \n
     def processEngine;<\/pre>\n<\/blockquote>\n
    The code to deploy this process is<\/p>\n
    \n
    RepositoryService repositoryService = processEngine.getRepositoryService();\r\n         repositoryService.createDeployment()\r\n                 .addResourceFromClasspath(\"helloWorld.jpdl.xml\")\r\n                 .deploy();\r\n<\/pre>\n<\/blockquote>\n<\/li>\n
  10. Lets start an instance of this service :
    \n
    \n
    ExecutionService executionService = processEngine.getExecutionService();\r\nexecutionService.startProcessInstanceByKey(\"helloWorld\");<\/pre>\n<\/blockquote>\n
    This will execute the printHelloWorld method of the Printer class as configured in the process description file.<\/li>\n<\/ol>\n
    Hope you find this useful. We are still working on executing more complex processes and will keep posting our learnings.<\/p>\n
    Your feedback and  suggestions are welcome.<\/p>\n
    Regards
    \n~~Himanshu Seth~~<\/p>\n
    http:\/\/www.tothenew.com<\/p>\n","protected":false},"excerpt":{"rendered":"
    Hi, In one of our projects, we had a requirement for using some existing Business Process Management tool. JBPM is one such tool that we are evaluating. Our first step was to run a “Hello World” process from inside the grails application. On searching over the internet, I didn’t find any helpful article\/blog on integrating […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":4},"categories":[7],"tags":[4840,240],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/743"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=743"}],"version-history":[{"count":0,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/743\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=743"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=743"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=743"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}