error getting from starting business process through Rest API

[suresh.t...@gmail.com]

Hi,
I want start particular process definition through Rest API. I used http://localhost:8080/engine-rest/process-instance API call with POST and i am passingprocess definition id with below code:
hp.setEntity(new StringEntity("{\"processDefinitionKey\":\"service1\"}", "UTF-8"));

I am getting below error:
SEVERE: Failed executing POST /process-instance
org.jboss.resteasy.spi.UnsupportedMediaTypeException: Cannot consume content type
at org.jboss.resteasy.core.registry.Segment.match(Segment.java:117)
at org.jboss.resteasy.core.registry.SimpleSegment.matchSimple(SimpleSegment.java:33)
at org.jboss.resteasy.core.registry.RootSegment.matchChildren(RootSegment.java:327)
at org.jboss.resteasy.core.registry.RootSegment.matchRoot(RootSegment.java:374)
at org.jboss.resteasy.core.registry.RootSegment.matchRoot(RootSegment.java:367)
at org.jboss.resteasy.core.ResourceMethodRegistry.getResourceInvoker
Please provide exact API and paramters for starting business process.

regards,
suresh

[Daniel Meyer]

Hi Suresh,

could you please provide some more information about your usage context? I assume that you are using some REST client from Java to do the post? Which libraries are you using? Is your JSON transformed correctly?

Cheers,

Daniel 

[thorben....@student.hpi.uni-potsdam.de]

Hi Suresh,

are you setting the content type header of your request to "application/json"?

Cheers,
Thorben

[tom...@gmail.com]

As a new user I use a rest client plugin.
Execute a GET request e.g. http://localhost:8080/engine-rest/engine/default/process-definition
Using the ID from above
Execute a POST request e.g. http://localhost:8080/engine-rest/engine/default/process-definition/<key>:<version>:<deployment id>/start

Ensure the content type is set, as this appears to be the error. Content-Type is application/json

Body should be empty or {}

Regards
Tom

[suresh.t...@gmail.com]

Hi Daniel,
Now i am not getting error by setting content type as application/json but my process is not starting with http://localhost:8080/engine-rest/process-instance .

Please provide correct Rest API for starting business process.
I am using HTTPClient API and code given below.
DefaultHttpClient dhc = new DefaultHttpClient();

dhc.getCredentialsProvider().setCredentials(new AuthScope(AuthScope.ANY_HOST, AuthScope.ANY_PORT, AuthScope.ANY_REALM), new UsernamePasswordCredentials("demo", "demo"));

HttpPost hp = new HttpPost("http://localhost:8080/engine-rest/process-instance");

AuthCache authCache = new BasicAuthCache();
// Generate BASIC scheme object and add it to the local auth cache
BasicScheme basicAuth = new BasicScheme();
authCache.put(new HttpHost("localhost", 8080, "http"), basicAuth);

// Add AuthCache to the execution context
BasicHttpContext localcontext = new BasicHttpContext();
localcontext.setAttribute(ClientContext.AUTH_CACHE, authCache);

HttpResponse processResponse;

try {
hp.setHeader("Content-type", "application/json");

hp.setEntity(new StringEntity("{\"processDefinitionKey\":\"service1\"}", "UTF-8"));

processResponse = dhc.execute(hp,localcontext);
BufferedReader br = new BufferedReader(
new InputStreamReader((processResponse.getEntity().getContent())));

String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
dhc.getConnectionManager().shutdown();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
regards,
suresh

[suresh.t...@gmail.com]

Hi Tom,
I tried with executing http://localhost:8080/engine-rest/process-definition/myProcess/start for starting process but i am getting below error.
{"type":"RestException","message":"Cannot instantiate process definition myProcess: no deployed process definition found with id 'myProcess'"}

myProcess process definition is exist in my BP Engine.Please let me know the solutions for this.

regards,
suresh
On Tuesday, 7 January 2014 13:11:15 UTC+1, suresh.t...@gmail.com wrote:

[Christian Lipphardt]

Hi Suresh,

you try to start a process instance from your process definition by using the key of the process definition (which is the attribute id in the bpmn xml).

You have to look up the id of your process definition by using http://localhost:8080/engine-rest/process-definition and search through the result what the id is.

Then invoke http://localhost:8080/engine-rest/process-definition/{id}/start .

Starting a process instance by key will be available with the next alpha release, see https://app.camunda.com/jira/browse/CAM-1505

Cheers

Christian