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can't start a process instance by REST API

Question asked by jerrylo on Apr 9, 2014
Latest reply on Nov 9, 2018 by dungdv24
I can't start the demo "createTimersProcess" process by REST API, the activiti version is 5.15.1.

my operations as the follow:

step 1. in RESTClient, I input
method: GET
url: http://kermit:kermit@

response is normal:
{"data":[{"id":"createTimersProcess:1:36","url":"','key':'createTimersProcess','version':1,'name':'Create timers process","description":"Test process to create a number of timers.","deploymentId":"20","deploymentUrl":"','resource':'','diagramResource':null,'category':'Examples','graphicalNotationDefined':false,'suspended':false,'startFormDefined':false}],"total":1,"start":0,"sort":"name","order":"asc","size":1}

step 2.
method: POST
url: http://kermit:kermit@
body: {"processDefinitionKey":"createTimersProcess"}

response is:
{"errorMessage":"The server is refusing to service the request because the entity of the request is in a format not supported by the requested resource for the requested method","statusCode":415}

is there anyone meet the same problem ?