This exception happens when launching a workflow from Talend MDM. Talend MDM leverages the mdm_context variable to serialise and pass the model and entity data to the workflow engine embedded in Talend MDM. This errors occurs when the workflow engine is unable to deserialise the data back into the mdm_context variable in the workflow.
This happens on Talend MDM 6.0, 6.1 and 6.2 with the Community Bonitasoft 6.5.x workflow engine. Note that this is OS independent. Community Bonitasoft 6.5.x portal should be running on Java 7.
You will receive the following exception as show below in the mdm log file:
Make sure you have at least 1 TalendMDMContextConnector in the entire workflow as shown below. You cannot have an mdm_context object without having a TalendMDMContextConnector. This error will happen if you remove all TalendMDMContextConnector in all the steps of your workflow.