Added ErrorController and NodeNotFoundException

package it.inaf.oats.vospace.exception;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.autoconfigure.web.servlet.error.AbstractErrorController;

import org.springframework.boot.web.servlet.error.ErrorAttributes;

import org.springframework.http.MediaType;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

@RequestMapping("${server.error.path:${error.path:/error}}")

public class ErrorController extends AbstractErrorController {

    @Autowired

    public ErrorController(ErrorAttributes errorAttributes) {

        super(errorAttributes);

    }

    @RequestMapping(produces = MediaType.TEXT_XML_VALUE)

    public void errorText(HttpServletRequest request, HttpServletResponse response) throws Exception {

        Map<String, Object> errors = super.getErrorAttributes(request, true);

        response.setContentType("text/plain;charset=UTF-8");

        response.getOutputStream().print((String) errors.get("message"));

    }

    @Override

    public String getErrorPath() {

        return null;

    }

}

package it.inaf.oats.vospace.exception;

import org.springframework.http.HttpStatus;

import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(value = HttpStatus.NOT_FOUND)

public class NodeNotFoundException extends VoSpaceException {

    public NodeNotFoundException(String path) {

        super("NodeNotFound: " + path);

    }

}

package it.inaf.oats.vospace.exception;

public class VoSpaceException extends RuntimeException {

    public VoSpaceException(String message) {

        super(message);

    }

}