Can an error be indicated in AWS Lambda for Java without resorting to throwing an exception?

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Yes, an error can be indicated in AWS Lambda for Java without resorting to throwing an exception. One way to do this is by using the context object passed to the Lambda function as a parameter. The context object provides a method called "fail" that can be called to indicate an error.

Here's an example:

public class MyLambda implements RequestHandler<RequestClass, ResponseClass> {
    public ResponseClass handleRequest(RequestClass request, Context context) {
        if (someErrorCondition) {
            context.fail("An error occurred.");
        }
        // perform normal processing
        return response;
    }
}

In this example, if the "someErrorCondition" is true, the "fail" method of the context object is called with an error message. This will indicate an error to AWS Lambda without throwing an exception.