My pod is created and while executing below command in pod after sometime getting error as command terminated with exit code 137

kubectl exec gradlecommandfromcommandline -- ./gradlew gatlingRun- 
simulations.RuntimeParameters -DUSERS=500 -DRAMP_DURATION
=5 -DDURATION=30

How to debug the problem ,i mean what is the issue,mind you the same docker equivalent command runs fine with docker run,but issue is only after i execute kubectl exec command on pod,As i suspected memory issue in kubectl so i do specified memory limits within 'default' namespace using below

apiVersion: v1
kind: LimitRange
metadata:
name: mem-min-max-demo-lr
spec:
limits:
- max:
  memory: 1Gi
min:

  memory: 500Mi

type: Container