topic How to use REST API along with activiti? in Alfresco Archive

How to use REST API along with activiti?

prasad1 — Fri, 17 Jun 2011 18:50:04 GMT

How to start a process instance using POST request. I am mainly concerned about its code implementation. As with the GET request we can provide the attribute-values in query string and paste it over browser but POST data are hidden and needs some sort of interface that will send such data. The user

Re: How to use REST API along with activiti?

frederikherema1 — Mon, 20 Jun 2011 12:35:17 GMT

The REST-principle (http://en.wikipedia.org/wiki/REST) is explained here. To "Create" (start) a process-instance, a POST is the HTTP-method to use…

Rest can indeed be used in a browser, but most of the time, the browser does something with this response (not just showing JSON, but render UI). With javascript, you can easilly formulate a http-request to a rest-endpoint using POST without having an actual form with input-parameters.

Re: How to use REST API along with activiti?

hamepal — Mon, 20 Jun 2011 14:05:36 GMT

@frederikheremans
Thanks for the reply…
it would be really nice of you, if you can provide a working code snippet of client side for sending (POST) REST request.

Thanks in advance…

Re: How to use REST API along with activiti?

prasad1 — Mon, 20 Jun 2011 15:26:39 GMT

I tried making a REST call using JavaScript. This is the code I run.

 function sendPost()
    {
        
        var data = [{"processDefinitionId":"restprocessid:1:1425"}];
        var xhr = new XMLHttpRequest();
        var url = "http://localhost:8080/activiti-rest/service/process-instance";
        xhr.open("POST", url, true); 
        //The following line tells the REST service to use the DELETE method instead of the POST method.  This is 
        //an architectural implementation due to the limits of clients supporting GET and POST methods, but 
        //not necessarily PUT and DELETE methods.
        xhr.setRequestHeader("X-Method-Override","DELETE"); 

        xhr.onreadystatechange = function() {
        if (xhr.readyState==4 && xhr.status==200) {
        //check for an error message contained in the REST response.  
        //If xhr.responseText is blank, update was successful.
        alert("SUCCESS");
        }
        else
        {
            alert("ERROR in RESPONSE: "+xhr.status+" , "+xhr.responseText);
        }
        }
        
        try {
        xhr.send (JSON.stringify(data));
        }
        catch(ex)
        {
            alert("Exception"+ex.message);
        }
        
    }

I run sendPost method in onclick event of button.

I am getting the following exceptions in CATALINA.OUT


11:17:07,304  ERROR [extensions.webscripts.AbstractRuntime] Exception from executeScript - redirecting to status template error: 05200003 Script url /process-instance does not support the method OPTIONS
org.springframework.extensions.webscripts.WebScriptException: 05200003 Script url /process-instance does not support the method OPTIONS
 at org.springframework.extensions.webscripts.AbstractRuntime.executeScript(AbstractRuntime.java:159)
 at org.springframework.extensions.webscripts.servlet.WebScriptServlet.service(WebScriptServlet.java:118)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 at java.lang.Thread.run(Thread.java:636)

I run the same process over activiti-explorer I got the correct output in CATALINA.OUT.
I have attached my XML file(process definition) along with this post.

Could you suggest me what am I missing in the REST call?

Re: How to use REST API along with activiti?

prasad1 — Mon, 20 Jun 2011 19:21:44 GMT

I fixed the code using solution in some other thread. I was sending 'processDefinitionId' instead of 'processDefinitionKey'. I am now able to make a REST call. But I am facing new issue while sending more variables to the process.
Here is my activiti diagram:
[img]http://static.inky.ws/thumb/411/thumb.jpg[/img]

I have added a groovy script as

print $myVar
and in the REST call I added the parameter myVar as


function sendPost()
    {
         try {
           
            var xhr = new XMLHttpRequest();
            var url = "http://localhost:8080/activiti-rest/service/process-instance";
            xhr.open("POST", url, true,"kermit","kermit"); 
           
            xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            xhr.onreadystatechange = function() {
            if (xhr.readyState==4 && xhr.status==200) {
            //check for an error message contained in the REST response.  
            //If xhr.responseText is blank, update was successful.
            alert("SUCCESS");
            }
            else
            {
                alert("ERROR in RESPONSE: "+xhr.status+" , "+xhr.responseText);
            }
        }
      [color=#FF0000] xhr.send("processDefinitionKey=restprocessid&myVar=man"); //working[/color]  // REST CALL
     }
        catch(ex)
        {
            alert("Exception"+ex.message);
        }
        
    }

I am getting the following error on browser:

ERROR in RESPONSE: 500 , {
    "status" : 
  {
    "code" : 500,
    "name" : "Internal Error",
    "description" : "An error inside the HTTP server which prevented it from fulfilling the request."
  },  
  
  "message" : "05200032 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: myVar for class: Script12",  
  "exception" : "org.springframework.extensions.webscripts.WebScriptException - 05200032 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: myVar for class: Script12",
  
  "callstack" : 
  [ 
     ""      ,"[color=#FF0000]groovy.lang.MissingPropertyException: No such property: myVar for class: Script12"[/color]
      ,"org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:49)"
      ,"org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:49)"
      ,"org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:239)"
      ,"Script12.run(Script12.groovy:1)"
      ,"org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:315)"
      ,"org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:111)"
      ,"javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:233)"
      ,"org.activiti.engine.impl.scripting.ScriptingEngines.evaluate(ScriptingEngines.java:70)"
      ,"org.activiti.engine.impl.bpmn.behavior.ScriptTaskActivityBehavior.execute(ScriptTaskActivityBehavior.java:43)"
      ,"org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:40)"
      ,"org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:76)"
      ,"org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:481)"
      ,"org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperatio
nTransitionNotifyListenerStart.java:48)"
      ,"org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:52)"

If I remove the parameter myVar in the rest call, the function works correctly in this case. What is wrong with this way of REST call?

Re: How to use REST API along with activiti?

frederikherema1 — Tue, 21 Jun 2011 06:09:36 GMT

Try sending the parameter "myVar_type=string" along with your myVar value…

Re: How to use REST API along with activiti?

prasad1 — Tue, 21 Jun 2011 14:23:59 GMT

I tried working around with parameters as below but no use.

processDefinitionKey=myprocess&myVar_type=prasad

What is type in this? Is type a specific keyword such as string, integer, etc? Where can I find information regarding allowed types?
Can you give me an example for this?

Small snippet of error:


"status" : 
  {
    "code" : 500,
    "name" : "Internal Error",
    "description" : "An error inside the HTTP server which prevented it from fulfilling the request."
  },  
  
  "message" : "05210009 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: myVar for class: Script9",  
  "exception" : "org.springframework.extensions.webscripts.WebScriptException - 05210009 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: myVar for class: Script9",

what is this about BusinessKey? I found something over here http://forums.activiti.org/en/viewtopic.php?f=6&t=1672. Do I need to be concerned about this? If yes, how?

My main objective is to send a string value to a script task.
This is my Jersey client code:

public static void main(String[] args) {
  // TODO Auto-generated method stub
  Client client = Client.create();
  client.addFilter(new HTTPBasicAuthFilter("kermit", "kermit"));
  WebResource webResource = client.resource("http://localhost:8080/activiti-rest/service/process-instance");
  
   MultivaluedMap formData = new MultivaluedMapImpl();
    formData.add("processDefinitionKey", "restprocessid");
    formData.add("myVar_type", "Integer");
    formData.add("myVar", "2");
    ClientResponse response = webResource.type("application/x-www-form-urlencoded").post(ClientResponse.class, formData);
    System.out.println(response.toString());
     
 }

I am getting the exceptions as described above. Can anyone please guide me.

Re: How to use REST API along with activiti?

frederikherema1 — Wed, 22 Jun 2011 05:34:01 GMT

I meant:


processDefinitionKey=myprocess&myVar=prasad&myVar_type=string

Re: How to use REST API along with activiti?

prasad1 — Wed, 22 Jun 2011 14:33:49 GMT

This did not work too.
I used the following parameters
processDefinitionKey=restprocessid&input=prasad&input_type=string
However I still getting HTTP/1.1 500 Internal Server Error as follows:
Snippet of error:


{
    "status" : 
  {
    "code" : 500,
    "name" : "Internal Error",
    "description" : "An error inside the HTTP server which prevented it from fulfilling the request."
  },  
  
  "message" : "05220009 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: [color=#FF0000]groovy.lang.MissingPropertyException: No such property: input for class: Script10",  [/color]
  "exception" : "org.springframework.extensions.webscripts.WebScriptException - 05220009 Wrapped Exception (with status template): problem evaluating script: javax.script.ScriptException: groovy.lang.MissingPropertyException: No such property: input for class: Script10",
  
  "callstack" : 
  [ 
     ""      ,"groovy.lang.MissingPropertyException: No such property: input for class: Script10"
      ,"org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:49)"
      ,"org.codehaus.groovy.runtime.callsite.PogoGetPropertySite.getProperty(PogoGetPropertySite.java:49)"
      ,"org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGroovyObjectGetProperty(AbstractCallSite.java:239)"
      ,"Script10.run(Script10.groovy:1)"
:
:

I tried sending the same parameters using AJAX via post parameters, but no use.

Re: How to use REST API along with activiti?

ronald_van_kuij — Wed, 22 Jun 2011 15:31:35 GMT

Look at what the errors says… Does your 'Script10 class' have a field called input?

Re: How to use REST API along with activiti?

prasad1 — Wed, 22 Jun 2011 15:41:35 GMT

there is no such class called 'Script10'. If i give another REST call, the error is


:
,"groovy.lang.MissingPropertyException: No such property: input for class: Script11"
:

then Script 12 and so on…

Re: How to use REST API along with activiti?

frederikherema1 — Fri, 24 Jun 2011 06:23:45 GMT

What does your script exactly look like… (the groovy script-tasl I mean)

Re: How to use REST API along with activiti?

prasad1 — Fri, 24 Jun 2011 14:17:54 GMT

It is a simple print statement.


print "hello $input"

Re: How to use REST API along with activiti?

frederikherema1 — Fri, 24 Jun 2011 18:06:38 GMT

Where is the input process-variable set?

Re: How to use REST API along with activiti?

prasad1 — Fri, 24 Jun 2011 22:05:08 GMT

REST API Parameters


processDefinitionKey=myprocess&input=prasad&input_type=string

Re: How to use REST API along with activiti?

michal_stachura — Sat, 10 Mar 2012 13:55:11 GMT

Hi there, I'm trying to post request into REST in the activiti version 5.6 by JS. I did it by firefox rest client

////rest client firefox ///
URL: http://localhost:8080/activiti-rest/proces-instance
method: post
Request body: { "processDefinitionId":"MyProcess:1:978",}

When I typed all of it, firefox rest client answers by status 200 OK. Process stared without any problem.
Now I'd like to do it by JavaScript posted before, I did it without any succes.

Can samebody please help me out with that?

Code is below:

function sendPost()
    {
         try {

            var xhr = new XMLHttpRequest();
            var url = "http://localhost:8080/activiti-rest/service/process-instance";
            xhr.open("POST", url, true,"kermit","kermit");

            xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
            xhr.onreadystatechange = function() {
            if (xhr.readyState==4 && xhr.status==200) {
            alert("SUCCESS");
            }
            else
            {
                alert("ERROR in RESPONSE: "+xhr.status+" , "+xhr.responseText);
            }
        }
      xhr.send({"processDefinitionId":"MyProcess:2:816",}); // REST CALL
     }
        catch(ex)
        {
            alert("Exception"+ex.message);
        }
    }

thanks

Re: How to use REST API along with activiti?

jbarrez — Wed, 15 May 2013 13:43:08 GMT

> Now I'd like to do it by JavaScript posted before, I did it without any succes.

What do you see? Do you see an error?

Re: How to use REST API along with activiti?

activi_user — Thu, 06 Jun 2013 10:46:35 GMT

Hi guys,
We're trying to get tasks via the rest service.
It appears that by default tasks are sorted by their Ids, and this way the newest task can be appended in some previous page.
Is there a way to sort tasks by their creation time, so newest task is appended in the last page?

Re: How to use REST API along with activiti?

jbarrez — Mon, 10 Jun 2013 14:55:14 GMT

Read http://activiti.org/userguide/index.html#N12DF2

The new 5.13 rest api will definitely support this.