org.springframework.web.servlet.PageNotFound

2017-07-11 16:36:13.489 WARN  [http-nio-8032-exec-16]org.springframework.web.servlet.PageNotFound -Request method 'POST' not supported
2017-07-11 16:37:30.491 WARN  [http-nio-8032-exec-48]org.springframework.web.servlet.PageNotFound -Request method 'POST' not supported

package org.springframework.web.servlet.mvc.support;

import java.io.IOException;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.beans.ConversionNotSupportedException;
import org.springframework.beans.TypeMismatchException;
import org.springframework.core.Ordered;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.web.HttpMediaTypeNotAcceptableException;
import org.springframework.web.HttpMediaTypeNotSupportedException;
import org.springframework.web.HttpRequestMethodNotSupportedException;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.MissingPathVariableException;
import org.springframework.web.bind.MissingServletRequestParameterException;
import org.springframework.web.bind.ServletRequestBindingException;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestPart;
import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.support.MissingServletRequestPartException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.NoHandlerFoundException;
import org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver;

/**
 * Default implementation of the {@link org.springframework.web.servlet.HandlerExceptionResolver
 * HandlerExceptionResolver} interface that resolves standard Spring exceptions and translates
 * them to corresponding HTTP status codes.
 *
 * <p>This exception resolver is enabled by default in the common Spring
 * {@link org.springframework.web.servlet.DispatcherServlet}.
 *
 * @author Arjen Poutsma
 * @author Rossen Stoyanchev
 * @author Juergen Hoeller
 * @since 3.0
 * @see org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler
 * @see #handleNoSuchRequestHandlingMethod
 * @see #handleHttpRequestMethodNotSupported
 * @see #handleHttpMediaTypeNotSupported
 * @see #handleMissingServletRequestParameter
 * @see #handleServletRequestBindingException
 * @see #handleTypeMismatch
 * @see #handleHttpMessageNotReadable
 * @see #handleHttpMessageNotWritable
 * @see #handleMethodArgumentNotValidException
 * @see #handleMissingServletRequestParameter
 * @see #handleMissingServletRequestPartException
 * @see #handleBindException
 */
public class DefaultHandlerExceptionResolver extends AbstractHandlerExceptionResolver {

    /**
     * Log category to use when no mapped handler is found for a request.
     * @see #pageNotFoundLogger
     */
    public static final String PAGE_NOT_FOUND_LOG_CATEGORY = "org.springframework.web.servlet.PageNotFound";

    /**
     * Additional logger to use when no mapped handler is found for a request.
     * @see #PAGE_NOT_FOUND_LOG_CATEGORY
     */
    protected static final Log pageNotFoundLogger = LogFactory.getLog(PAGE_NOT_FOUND_LOG_CATEGORY);

    ....
    
        /**
     * Handle the case where no request handler method was found.
     * <p>The default implementation logs a warning, sends an HTTP 404 error, and returns
     * an empty {@code ModelAndView}. Alternatively, a fallback view could be chosen,
     * or the NoSuchRequestHandlingMethodException could be rethrown as-is.
     * @param ex the NoSuchRequestHandlingMethodException to be handled
     * @param request current HTTP request
     * @param response current HTTP response
     * @param handler the executed handler, or {@code null} if none chosen
     * at the time of the exception (for example, if multipart resolution failed)
     * @return an empty ModelAndView indicating the exception was handled
     * @throws IOException potentially thrown from response.sendError()
     * @deprecated as of 4.3, along with {@link org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException}
     */
    @Deprecated
    protected ModelAndView handleNoSuchRequestHandlingMethod(org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException ex,
            HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {

        pageNotFoundLogger.warn(ex.getMessage());
        response.sendError(HttpServletResponse.SC_NOT_FOUND);
        return new ModelAndView();
    }

    /**
     * Handle the case where no request handler method was found for the particular HTTP request method.
     * <p>The default implementation logs a warning, sends an HTTP 405 error, sets the "Allow" header,
     * and returns an empty {@code ModelAndView}. Alternatively, a fallback view could be chosen,
     * or the HttpRequestMethodNotSupportedException could be rethrown as-is.
     * @param ex the HttpRequestMethodNotSupportedException to be handled
     * @param request current HTTP request
     * @param response current HTTP response
     * @param handler the executed handler, or {@code null} if none chosen
     * at the time of the exception (for example, if multipart resolution failed)
     * @return an empty ModelAndView indicating the exception was handled
     * @throws IOException potentially thrown from response.sendError()
     */
    protected ModelAndView handleHttpRequestMethodNotSupported(HttpRequestMethodNotSupportedException ex,
            HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {

        pageNotFoundLogger.warn(ex.getMessage());
        String[] supportedMethods = ex.getSupportedMethods();
        if (supportedMethods != null) {
            response.setHeader("Allow", StringUtils.arrayToDelimitedString(supportedMethods, ", "));
        }
        response.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED, ex.getMessage());
        return new ModelAndView();
    }
    ....
}