The NativeArray.add() function in Mozilla Rhino consistently throws an error

I am attempting to build a JavaScript array in Java using the NativeArray class from Mozilla Rhino. However, when I try to add elements to the NativeArray, it throws a 

java.lang.UnsupportedOperationException
.

Below is the code snippet:

NativeArray array = new NativeArray(1);
array.add("cccc");

The error received is as follows:

Caused by: java.lang.UnsupportedOperationException
    at org.mozilla.javascript.NativeArray.add(NativeArray.java:1826)

If I create the NativeArray with a Java array from the start, everything works fine:

String[] str = new String[2];
str[0] = "aaaa";
str[1] = "bbbb";
NativeArray array = new NativeArray(str);

Upon inspecting the source code of NativeArray, I noticed that the add method always throws an error. The source code can be found here:

Please note: I am using version 1.7R4 of Mozilla Rhino, which is the latest version available.

Is this a bug within Mozilla Rhino or am I missing something in my implementation?

Thank you

javajavascriptrhino

Answer №1

Instead of using the add() function, you can utilize the code snippet below:

NativeArray newArray;
newArray.insert(newArray.count(), newArray, output);

Answer №2

Upon reflection, my initial response (seen below) is inaccurate. The term "native" in this context refers to a "native JavaScript array". As for why the .add() method is not included in the implementation even though it extends the List interface, I am unable to provide a definitive answer. Nonetheless, one can still utilize standard JavaScript methods like .push() to modify arrays.

It wouldn't make sense to incorporate the .add() method for native arrays as they are of fixed length and cannot be altered.

It's worth noting that .add() is categorized as an "optional operation" within the java.util.Collection interface.

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