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Kiwi is a utility library. We really like Google's Guava, and also use Apache Commons. But if they don't have something we need, and we think it is useful, this is where we put it.

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package org.kiwiproject.jaxrs.exception;

import javax.ws.rs.core.Response;
import javax.ws.rs.ext.ExceptionMapper;
import javax.ws.rs.ext.Provider;

/**
 * Map {@link IllegalStateException} to {@link Response}.
 * 
 * The mapped response has status code 500 (Bad Request) and media type JSON.
 */
@Provider
public class IllegalStateExceptionMapper implements ExceptionMapper {

    /**
     * Convert the given {@link IllegalStateException} to a 500 Internal Server Error response containing a JSON entity.
     *
     * @param exception the exception to convert
     * @return a response
     * @see JaxrsExceptionMapper#buildResponse(JaxrsException)
     */
    @Override
    public Response toResponse(IllegalStateException exception) {
        return JaxrsExceptionMapper.buildResponse(new JaxrsException(exception, 500));
    }
}