src/jsr311-api/src/javax/ws/rs/ext/ExceptionMapper.java

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package javax.ws.rs.ext;

import javax.ws.rs.core.Response;

/**
 * Contract for a provider that maps Java exceptions to 
 * {@link javax.ws.rs.core.Response}. An implementation of this interface must 
 * be annotated with {@link Provider}.
 * 
 * @see Provider
 * @see javax.ws.rs.core.Response
 */
public interface ExceptionMapper<E extends Throwable> {

    /**
     * Map an exception to a {@link javax.ws.rs.core.Response}. Returning 
     * {@code null} results in a {@link javax.ws.rs.core.Response.Status#NO_CONTENT}
     * response. Throwing a runtime exception results in a 
     * {@link javax.ws.rs.core.Response.Status#INTERNAL_SERVER_ERROR} response
     * @param exception the exception to map to a response
     * @return a response mapped from the supplied exception
     */
    Response toResponse(E exception);
}