[jboss-jira] [JBoss JIRA] Created: (JBRULES-2912) Drools Planner Divide By Zero Error

[David Faulkner (JIRA)]

Drools Planner Divide By Zero Error
-----------------------------------

                 Key: JBRULES-2912
                 URL: https://issues.jboss.org/browse/JBRULES-2912
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-planner
    Affects Versions: 5.1.1.FINAL
         Environment: Windows, Intel desktop-class, Java6 (bug is not environment-specific)
            Reporter: David Faulkner
            Assignee: Mark Proctor


In org.drools.palnner.core.localsearch.DefaultLocalSearchSolver::solvingEnded, there is potentially a divide by zero that occurs on the line:

long averageCalculateCountPerSecond = localSearchSolverScope.getCalculateCount() * 1000L / timeMillisSpend;

if timeMillisSpend is zero. Although in theory the likelihood of this occurring in practically nothing, we have actually seen it occur on a POC project with long running Planner jobs. An appropriate guard should be added to this calculation to ensure that this error cannot occur.

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