java.lang.OutOfMemoryError: GC overhead limit exceeded while running in Jar file

Appium version : 1.8.1
node : 10.3.0
Platform : Android OS 8.1.0
Selenium : 3.11.1
Java Client :6.0.0
Mac OS : 10.13.4

Observation:
java.lang.OutOfMemoryError: GC overhead limit exceeded

TestNg Logs:
java.lang.NullPointerException
at com.sandisk.slater.HomeRun.BackupAndRestore.SMZ57_Backup_In_Airplane_Mode.afterMethod(SMZ57_Backup_In_Airplane_Mode.java:201)
at com.sandisk.slater.SuiteRunner.SuiteRunner.main(SuiteRunner.java:164)
… Removed 23 stack frames
Click to hide stack frames
java.lang.NullPointerException
at com.sandisk.slater.HomeRun.BackupAndRestore.SMZ57_Backup_In_Airplane_Mode.afterMethod(SMZ57_Backup_In_Airplane_Mode.java:201)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:510)
at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:211)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:708)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sandisk.slater.SuiteRunner.SuiteRunner.main(SuiteRunner.java:164)

Please let me know what all logs are needed to debug it.