CODEWITHSUNDEEP
javajava-native-interface
vignesh
vignesh

Reputation: 568

how to specify the method signature for a method with nested Object as parameter in jni

I have a java class calling a native function through jni.The java class consists of the following method.

public void indexToEs(ArrayList<LinkedHashMap <String , Object>> list) throws IOException 
    {
            IndexingLogDataToES indexingobj = new IndexingLogDataToES();
            indexingobj.indexLogData(list , logName, client);
    }

Now how should i specify the method signature in order to get the method Id of this method in my native function. i tried the following but it didnt work.i get method id as null.

jmethodID indexMethod = env->GetMethodID(callingClass , "indexToEs" , "(Ljava/util/ArrayList(Ljava/util/LinkedHashMap;);)V");
    if( indexMethod == NULL )
    {
        cout << "index method not found" << endl ;
        return ;  
    }
    else cout << "index method found" << endl ;

Where calling class is the reference to the class calling.How should i do this.Thanks in advance.

Upvotes: 0

Views: 914

Answers (1)

Thomas Fritsch
Thomas Fritsch

Reputation: 10127

Because of type erasure the type parameters don't get compiled into the class file.

Therefore, the method void indexToEs(ArrayList<LinkedHashMap<String,Object>>) has the same signature as the method void indexToEs(ArrayList) would have.

That means, the method signature is just (Ljava/util/ArrayList;)V and you should call

env->GetMethodID(callingClass , "indexToEs" , "(Ljava/util/ArrayList)V");

Upvotes: 1

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