@ExceptionHandler methods logs at DEBUG level again

Issue: SPR-17383

Author: rstoyanchev

spring-webmvc/src/main/java/org/springframework/web/servlet/handler/AbstractHandlerExceptionResolver.java

@@ -135,11 +135,18 @@ public ModelAndView resolveException(
 			prepareResponse(ex, response);
 			ModelAndView result = doResolveException(request, response, handler, ex);
 			if (result != null) {
-				// Print warn message when warn logger is not enabled...
-				if (logger.isWarnEnabled() && (this.warnLogger == null || !this.warnLogger.isWarnEnabled())) {
-					logger.warn("Resolved [" + ex + "]" + (result.isEmpty() ? "" : " to " + result));
+				// Print warn or debug message when warn logger is not enabled...
+				if (this.warnLogger == null || !this.warnLogger.isWarnEnabled()) {
+					if (!useWarnLevelWhenWarnLoggerNotEnabled()) {
+						if (logger.isDebugEnabled()) {
+							logger.debug("Resolved [" + ex + "]" + (result.isEmpty() ? "" : " to " + result));
+						}
+					}
+					else if (logger.isWarnEnabled()) {
+						logger.warn("Resolved [" + ex + "]" + (result.isEmpty() ? "" : " to " + result));
+					}
 				}
-				// warnLogger with full stack trace (requires explicit config)
+				// Log with warnLogger (requires explicit config)
 				logException(ex, request);
 			}
 			return result;
@@ -179,6 +186,16 @@ protected boolean shouldApplyTo(HttpServletRequest request, @Nullable Object han
 		return (this.mappedHandlers == null && this.mappedHandlerClasses == null);
 	}
 
+	/**
+	 * Whether to log warn level messages (return value "true") or debug level
+	 * messages (return value "false") through the regular class logger when
+	 * {@link #setWarnLogCategory warn logging} is not activated.
+	 * <p>By default returns "true".
+	 */
+	protected boolean useWarnLevelWhenWarnLoggerNotEnabled() {
+		return true;
+	}
+
 	/**
 	 * Log the given exception at warn level, provided that warn logging has been
 	 * activated through the {@link #setWarnLogCategory "warnLogCategory"} property.

spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ExceptionHandlerExceptionResolver.java

@@ -491,4 +491,10 @@ protected ServletInvocableHandlerMethod getExceptionHandlerMethod(
 		return null;
 	}
 
+	@Override
+	protected boolean useWarnLevelWhenWarnLoggerNotEnabled() {
+		// Use DEBUG level
+		return false;
+	}
+
 }