Handle Jackson InvalidDefinitionException with 5xx status in WebFlux

Issue: SPR-14925

spring-core/src/main/java/org/springframework/core/codec/InternalCodecException.java

@@ -0,0 +1,37 @@
+/*
+ * Copyright 2002-2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.core.codec;
+
+/**
+ * Codec exception suitable for internal errors, like those not related to invalid data. It can be used to make sure
+ * such error will produce a 5xx status code and not a 4xx one when reading HTTP messages for example.
+ *
+ * @author Sebastien Deleuze
+ * @since 5.0
+ */
+@SuppressWarnings("serial")
+public class InternalCodecException extends CodecException {
+
+	public InternalCodecException(String msg) {
+		super(msg);
+	}
+
+	public InternalCodecException(String msg, Throwable cause) {
+		super(msg, cause);
+	}
+
+}