Description of problem:
All informations about failures of simulation engine are shown in server.log but not as alerts or validation issues.

Version-Release number of selected component (if applicable):
BPMS 6.0.0 ER1

How reproducible:

Steps to Reproduce:
1. Import the attached process
2. Run Simulation for 10 instancies and interval 2 minutes
3. Validate process
4. Fix validation issues:
-> Add script to "Decission" task: myVar = new Random().nextInt(10);
-> Add conditions to gateway's flows: myVar < 5; myVar > 4;
5. Validate
6. Run Simulation for 10 process instancies and interval 2 minutes

Actual results:
---------------
Step 2. - Simulation return result, diagrams are available.
Step 5. - Validation is ok.
Step 6. - Alert "Simulation engine did not return results.";

Server.log:
Process Compilation error : org.drools.compiler.lang.descr.ProcessDescr@73ebf723
org/jbpm/Process_org_jbpm_simTest1069076629.java (8:346) : Random cannot be resolved to a type
org/jbpm/Process_org_jbpm_simTest1069076629.java (14:586) : Syntax error on token ">", invalid AssignmentOperator
org/jbpm/Process_org_jbpm_simTest1069076629.java (20:808) : Syntax error on token "<", invalid AssignmentOperator

An user which has not access to server.log has no idea about problems!!!!

Expected results:
-----------------
There are two options:

• validation shows, that scripts are invalid
• propagate errors from server.log to alerts:
  -> Task "Decission", property "Script": Random cannot be resolved to a type
  -> Sequence flow "", property "Condition Expression": Syntax error on token ">", invalid AssignmentOperator
  -> Sequence flow "", property "Condition Expression": Syntax error on token "<", invalid AssignmentOperator

Additional info:
I know that input for Script's properties are invalid, but point is that users should know why simulation engine failed.