Make type in ProblemDetail nullable

Signed-off-by: Christoph Wagner <[email protected]>
Signed-off-by: Christoph <[email protected]>

Author: cw-dimedis

spring-web/src/main/java/org/springframework/http/ProblemDetail.java

@@ -107,15 +107,14 @@ protected ProblemDetail() {
 	 * <p>By default, this is {@link #BLANK_TYPE}.
 	 * @param type the problem type
 	 */
-	public void setType(URI type) {
-		Assert.notNull(type, "'type' is required");
+	public void setType(@Nullable URI type) {
 		this.type = type;
 	}
 
 	/**
 	 * Return the configured {@link #setType(URI) problem type}.
 	 */
-	public URI getType() {
+	public @Nullable URI getType() {
 		return this.type;
 	}
 
@@ -245,7 +244,7 @@ public void setProperties(@Nullable Map<String, Object> properties) {
 	@Override
 	public boolean equals(@Nullable Object other) {
 		return (this == other || (other instanceof ProblemDetail that &&
-				getType().equals(that.getType()) &&
+				ObjectUtils.nullSafeEquals(getType(), that.getType()) &&
 				ObjectUtils.nullSafeEquals(getTitle(), that.getTitle()) &&
 				this.status == that.status &&
 				ObjectUtils.nullSafeEquals(this.detail, that.detail) &&