How to invoke a REST API's from BPMN?

[surendarmx]

Hi,

I am new to jBPM and now I am trying to invoke a REST API from BPMN process.

Please help me in this process.

Thanks in advance

[tsurdilovic]

http://docs.jboss.org/jbpm/v5.2/userguide/ch13.html

[surendarmx]

Hi Tihomir,

Thanks for the reply!

The link that sent by you is explaining about Domain-Specific process. I am not able to identify how to invoke a API from that document.

Could you please help me how to invoke using the Domain-Specific process.

Thanks

[tsurdilovic]

You could follow the example in section "13.2.4. Executing service nodes" of the same chapter. If your process execution reaches a service node, and you have registered a handler for it, the handler's executeWorkitem method is invoked. At that point you are doing just Java code so you can have it do what you wish.

[surendarmx]

Yes, I got it!! Let me try doing the things with the help of that example.

Thanks

[surendarmx]

Hi Tihomir,

I am working with the example in the document, I am able to create work definition and use the same in the project.

But, while creating a domain specific node to execute Java, I got an error alert as,

"Could not parse work definitions JavaNodeDefinition.conf: java.util.HashMap cannot be cast to java.util.list"

Could you please help me in resolving this problem.

Thanks in advance

[tsurdilovic]

Most likely the structure of the MVEL in your .conf or .wid files (workitem config file) is wrong. Can you show it so we can tak a look?

[surendarmx]

Hi,

Thanks for the reply. Here I show how I my MVEL in my conf files

drools.rulebase.conf  cintains,

"drools.workDefinitions =  JavaNodeDefinition.conf MyWorkDefinitions.conf"

and

MyWorkDefinitions.conf contains,

"

import org.drools.process.core.datatype.impl.type.StringDataType;

[

  // the Notification work item

  [

    "name" : "Notification",

    "parameters" : [

      "Message" : new StringDataType(),

      "From" : new StringDataType(),

      "To" : new StringDataType(),

      "Priority" : new StringDataType(),

    ],

    "displayName" : "Notification",

    "icon" : "icons/star.png"

  ]

]

"

JavaNodeDefinition.conf contains,

"

import org.drools.process.core.datatype.impl.type.StringDataType;

[

  // the Java Node work item located in:

  // project/src/main/resources/META-INF/JavaNodeDefinition.conf

  [

    "name" : "JavaNode",

    "parameters" : [

      "class" : new StringDataType(),

      "method" : new StringDataType(),

    ],

    "displayName" : "Java Node",

    "icon" : "icons/java.gif"

  ]

]

"

I have put all this conf files inside "\workspace\Testing\src\main\resources\META-INF" folder