Cannot invoke \"java.lang.Package.getName()\" because the return value of \"java.lang.Class.getPackage()\" is null

For the Business Knowledge Model if the invoked function is of type java, but the return type is an array e.g String[]. It throws the following error during execution of Decision.

Method Signature :

 
public static String[] extract06GRecords(String FNMAData)

{

   String[] arrayofString =

;
   return arrayofString;
}
 

java.lang.NullPointerException: Cannot invoke "java.lang.Package.getName()" because the return value of "java.lang.Class.getPackage()" is null
at org.kie.server.api.model.dmn.DMNResultKS.stubDMNResult(DMNResultKS.java:372)
at org.kie.server.api.model.dmn.DMNResultKS.setDmnContext(DMNResultKS.java:140)
at org.kie.server.api.model.dmn.DMNResultKS.<init>(DMNResultKS.java:93)
at org.kie.server.api.model.dmn.DMNResultKS.<init>(DMNResultKS.java:99)
at org.kie.server.api.model.dmn.DMNResultKS.<init>(DMNResultKS.java:105)
at org.kie.server.services.dmn.ModelEvaluatorServiceBase.evaluateDecisions(ModelEvaluatorServiceBase.java:204)
at org.kie.server.remote.rest.dmn.ModelEvaluatorResource.evaluateDecisions(ModelEvaluatorResource.java:114)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)