Getting an error when trying to start a process via REST
steffen....@gmail.com
got another problem here with REST. After utilizing the great quickstart for Camunda BPM and REST (https://github.com/camunda/camunda-quickstarts/tree/master/deployment/embedded-spring-rest) I am now fiddling around with the REST API.
For starters I tried to start the deployed process loanApproval.bpmn via the REST API using http://localhost:8080//embedded-spring-rest-7.0.0-SNAPSHOT/engine/MyBPMEngine/process-definition/loanApproval/start and the Firefox RESTClient.
However I receive an error that I can not resolve on my own.
5059790 [http-bio-8080-exec-10] ERROR org.jboss.resteasy.core.ExceptionHandler - failed to execute
javax.ws.rs.NotSupportedException: Cannot consume content type
at org.jboss.resteasy.core.registry.SegmentNode.match(SegmentNode.java:375)
at org.jboss.resteasy.core.registry.SegmentNode.match(SegmentNode.java:113)
at org.jboss.resteasy.core.registry.RootNode.match(RootNode.java:43)
at org.jboss.resteasy.core.LocatorRegistry.getResourceInvoker(LocatorRegistry.java:79)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:131)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:109)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:135)
at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:103)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:356)
at org.jboss.resteasy.core.SynchronousDispatcher.invokePropagateNotFound(SynchronousDispatcher.java:217)
at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:224)
at org.jboss.resteasy.plugins.server.servlet.FilterDispatcher.doFilter(FilterDispatcher.java:62)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.camunda.bpm.engine.rest.filter.CacheControlFilter.doFilter(CacheControlFilter.java:47)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
Neither providing a message body nor using another process did change anything.
Any help is much appreciated.
Best,
Steffen
Daniel Meyer
Can you provide the request / response headers of the request you are
executing? Which accept content type header is being set?
The headers can probably be obtained using Firebug. As an alternative you
could provide us with a screenshot of the settings you are using in
Firefox RESTClient.
Cheers,
Daniel Meyer
Steffen Heublein
Hi Daniel,
as I understood the API, I used the following URI in order to start the process.
http://localhost:8080//embedded-spring-rest-7.0.0-SNAPSHOT/engine/CRM/process-definition/loanApproval/start
As the process does not use any variables I left the body empty (not sure whether this is correct, but trying like in the screenshot did not work out either).
128473 [http-bio-8080-exec-4] ERROR org.jboss.resteasy.core.ExceptionHandler - Failed executing POST /engine/CRM/process-definition/loanApproval/start
org.jboss.resteasy.spi.ReaderException: java.io.EOFException: No content to map to Object due to end of input
at org.jboss.resteasy.core.MessageBodyParameterInjector.inject(MessageBodyParameterInjector.java:183)
at org.jboss.resteasy.core.MethodInjectorImpl.injectArguments(MethodInjectorImpl.java:88)
...
Daniel Meyer
Hi Steffen,
I think that your request body is incorrect:
Should be
{}
or
{
"variables": {
"creditor": {
"value": "jonny",
"type": "String"
}
}
}
See also:
http://docs.camunda.org/api-references/rest/#!/process-definition/post-start-process-instance
I find this to be a useful tool for validating the validity of json objects:
Cheers,
Daniel
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steffen....@gmail.com
thanks for your help, I think that did it! I was unsure how to express an empty request body, and obviously did it wrong on my own. But your response got that solved
Best,
Steffen
Daniel Meyer
Cheers,
Daniel
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steffen....@gmail.com
Gesendet: Mittwoch, 21. August 2013 14:18
An: camunda-...@googlegroups.com
Cc: steffen....@gmail.com