Found in GWT Release: 1.3

Detailed description: The toArray(SomeClass[]) method is not implemented in GWT's ArrayList. At the very least the documentation should clearly state that the method is not available because it is a widely used method on java.util.ArrayList.

Workaround if you have one: Write your own implementation of

static MyClass[] toArray(List/<MyClass>/ list)

for each class you need to do this for.

Links to the relevant GWT Developer Forum posts: http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/f46ac6677ffa85c0/a9d911421f528778?lnk=gst&q=toArray&rnum=1#a9d911421f528778

This method is nice for eliminating casting and copying, e.g.

HasFocus[] result = new HasFocus[list.size()]; list.toArray(result); foo(result);

vs

HasFocus[] result = new HasFocus[list.size()]; Object[] temp = list.toArray(); for (int i; i < result.length; i++) { result[i] = (HasFocus) temp[i]; } foo(result);

I realize that without refelection you cannot auto-expand the array parameter's size. But even a minimal implementation which throws an IndexOutOfBoundsException would save a lot of user code. (I wonder if you really need reflection. How are arrays implemented in GWT? Could JSNI be used to expand the size of the array param?)

+100 for this one.

I tried to use toArray( Range[ result.size() ] ) but the compiler fails to run in this case.

If I just use toArray() then in the browser it works but the Hosted mode fails because of a ClassCastException. Using GWT.isScript does not help unfortunately.

This kind of fell off the radar.

Committed as r1270.

1.4 RC2 now released.

When inspecting the JClassType of the interface java.util.List it does not have a JMethod for the interfaces method "toArray(Object[])". Should this not be available? I'm writing a generator that creates a class that implements java.util.List, I loop through all the methods, however the generated class fails to compile indicating:

The type ListWrapper must implement the inherited abstract method Collection.toArray (Object[])