Description of problem:

Validation of the imports in the work item definition is not performed.


Version-Release number of selected component (if applicable):
bpm 6.0.2

How reproducible:

always

Steps to Reproduce:
1. Open the default WorkItemDefinition file which gets created when you create new process in business-central
2. To whatever workitem add this parameter


  "port" : new IntegerDataType()

And **don't** include 
import org.drools.core.process.core.datatype.impl.type.IntegerDataType;

Save and Validate  - everything seems successful
3. open the process definition, and the Service Tasks tab from the Object Library is completely missing!
4. Following error can be observer in the server.log

12:59:22,262 ERROR [org.jbpm.designer.web.preprocessing.impl.JbpmPreprocessingUnit] (http-localhost/127.0.0.1:8080-1) Unable to parse a workitem definition: [Error: unable to resolve class: IntegerDataType from [Module "deployment.business-central.war:main" from Service Module Loader]]
[Near : {... "port" : new IntegerDataType(), ....}]
                          ^
[Line: 63, Column: 20]

Actual results:

Imports in the WorkItemDefinition are not validated and causing subsequent issues in the Designer.

Expected results:

Imports in the WorkItemDefinition are validated.


Additional info: