addDimensionWithVehicleCapacity hits Java memory access error EXCEPTION_ACCESS_VIOLATION

[smile-on]

Any Java developer expects library to pin java objects it uses. I was able to use  routing.addDimension() successfully but moving to routing.addDimensionWithVehicleCapacity() hit EXCEPTION_ACCESS_VIOLATION which to me sounds like JVM freed memory that was used in JNI call. I don't know details of Google protobufer and Swig techicalities library is using to bridge Java with C++ but something strange happens at addDimensionWithVehicleCapacity call. I also noticed some memory object in C# library got pinned manually before calls.

This Java fragment works fine

routing.addDimension(formulation.volumeCallback, slack_max, aVehicle.capacityVolume, fix_start_cumul_to_zero, "volume");

wher aVehicle.capacityVolume is a simple Java int.

That fails with EXCEPTION_ACCESS_VIOLATION

routing.addDimensionWithVehicleCapacity(formulation.volumeCallback, slack_max, formulation.volumeCaps, fix_start_cumul_to_zero, "volume");

where formulation.volumeCaps is regular Java array long[#_of_vechicls]

# A fatal error has been detected by the Java Runtime Environment:

#

#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000007fee1c1aed9, pid=3572, tid=0x000000000000147c

#

# JRE version: Java(TM) SE Runtime Environment (8.0_102-b14) (build 1.8.0_102-b14)

# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.102-b14 mixed mode windows-amd64 compressed oops)

# Problematic frame:

# C  [jniortools.dll+0x7aed9]

#

Register to memory mapping:

RAX=0x000000000000000a is an unknown value

RBX={method} {0x0000000019860300} 'RoutingModel_addDimensionWithVehicleCapacity' '(JLcom/google/ortools/constraintsolver/RoutingModel;JLcom/google/ortools/constraintsolver/NodeEvaluator2;J[JZLjava/lang/String;)Z' in 'com/google/ortools/constraintsolver/operations_research_constraint_solverJNI'

I can't figure out what do I do wrong in terms of or-tools API.

Do you have any Java tests / Java examples where you used addDimensionWithVehicleCapacity() ?

[smile-on]

 I found official reference to AddDimensionWithVehicleCapacity on page 400 of "The User Manual on API" :)

Bad part, that text does not match Java declaration I see in the library.

I see long[] instead of VehicleEvaluator* vehicle_capacity in the declaration

//fails

[smile-on]

Very trivial example of multi vehicle CVRP has been created SimpleRoutingMultiVehicles.java.

It demonstraits EXCEPTION_ACCESS_VIOLATION error. Unfortunately I can't see what I do wrong and need someone to point on the problem.

[Ken Alton]

This issue should be resolved with https://github.com/google/or-tools/pull/287. Please let me know how it goes.

[smile-on]

I am using compiled distributive of or-tools (or-tools_VisualStudio2015-64bit_v5.0.3919.zip). Which release is the change goint to be included in?

[Driss Lahlou]

The next one, mostly this month.

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driss