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invoke ESB service from url

I have an ESB service exposed as a web service.It was built on Talend ESB studio 5. I am able to invoke it via SOAP UI. I would like to invoke the job through the browser. For this I have tried hitting it as
http://hotSmiley Tongueort/services/DummyService?method=runJob&args=--context_param%20testid=123
but I get SOAP fault. When I check the logs it gives
11:42:55,751 | INFO | ram%20testid=123 | ernal.GenericServiceProviderImpl 72 | - - | Invoke operation 'null'
Caused by: java.lang.NullPointerException
at org.talend.esb.job.controller.internal.GenericServiceProviderImpl.invoke(
at org.talend.esb.job.controller.internal.GenericServiceProviderImpl.invoke(
I think it was not able to find the operation to invoke. Hence I tried to add the operation as well in the url like
http://hostSmiley Tongueort/services/DummyService/DummyServiceOperation?method=runJob&args=--context_param%20testid=123
I get a soap fault as
<soap:Fault><faultcode>soapSmiley Frustratederver</faultcode><faultstring>Parameter should be ordered in the following sequence: </faultstring></soap:Fault>

Could someone please guide me on how to invoke the service. Its a simple service which creates a log file.