SPR-14818: Added MissingHeaderException type

spring-web/src/main/java/org/springframework/web/bind/MissingHeaderException.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2018 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.web.bind;
+
+import org.springframework.core.MethodParameter;
+
+/**
+ * {@link ServletRequestBindingException} subclass that indicates that a header
+ * variable expected in the method parameters of an {@code @RequestMapping}
+ * is not present.
+ *
+ * @author Per Böckman
+ *
+ */
+@SuppressWarnings("serial")
+public class MissingHeaderException extends ServletRequestBindingException {
+
+	private final String name;
+
+	private final MethodParameter parameter;
+
+
+	/**
+	 * Constructor for MissingHeaderException.
+	 * @param name the name of the missing header
+	 * @param parameter the method parameter
+	 */
+	public MissingHeaderException(String name, MethodParameter parameter) {
+		super("");
+		this.name = name;
+		this.parameter = parameter;
+	}
+
+
+	@Override
+	public String getMessage() {
+		return "Missing request header '" + name +
+				"' for method parameter of type " + parameter.getNestedParameterType().getSimpleName();
+	}
+
+	/**
+	 * Return the expected name of the header.
+	 */
+	public final String getName() {
+		return this.name;
+	}
+
+	/**
+	 * Return the method parameter bound to the path variable.
+	 */
+	public final MethodParameter getParameter() {
+		return this.parameter;
+	}
+
+}

spring-web/src/main/java/org/springframework/web/method/annotation/RequestHeaderMethodArgumentResolver.java

@@ -22,6 +22,7 @@
 import org.springframework.core.MethodParameter;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
+import org.springframework.web.bind.MissingHeaderException;
 import org.springframework.web.bind.ServletRequestBindingException;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.RequestHeader;
@@ -82,8 +83,7 @@ protected Object resolveName(String name, MethodParameter parameter, NativeWebRe
 
 	@Override
 	protected void handleMissingValue(String name, MethodParameter parameter) throws ServletRequestBindingException {
-		throw new ServletRequestBindingException("Missing request header '" + name +
-				"' for method parameter of type " + parameter.getNestedParameterType().getSimpleName());
+		throw new MissingHeaderException(name, parameter);
 	}