CODEWITHSUNDEEP
javaeclipse-jdtnon-nullable
CasaDelGato
CasaDelGato

Reputation: 645

Problem with java TransferHandler and @NonNullByDefault

Most of our code packages have a package-info.java that specifies @NonNullByDefault. (This has drastically reduced the number of NullPointerExceptions we encounter)

I now need to write a TransferHandler for a class - but it seems impossible to do if @NonNullByDefault is in effect. This code shows the issue:

private static class ProductTransferHandler extends TransferHandler {
    private static final long serialVersionUID = 1L;

    @Override
    public boolean canImport(final @Nullable TransferHandler.TransferSupport info) {
        return false;
    }

    @Override
    public boolean importData(final TransferHandler.TransferSupport info) {

        if (!info.isDrop()) {
            return false;
        }
        
        return false;
    }
}

Both of the methods are marked as an error in eclipse:

Illegal redefinition of parameter info, inherited method from TransferHandler does not constrain this parameter

It doesn't matter if the @Nullable is there or not. Same error either way.

Is there ANY way to do this with @NonNullByDefault in effect? Or do I have to move this class to it's own file in some other package just to NOT do that?

Upvotes: 0

Views: 15

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