Add fluent problem properties

belgif-rest-problem/src/main/java/io/github/belgif/rest/problem/api/InputValidationProblem.java

@@ -100,6 +100,42 @@ public void addInvalidParam(InvalidParam invalidParam) {
         invalidParams.add(invalidParam);
     }
 
+    // fluent properties
+
+    @Override
+    public InputValidationProblem href(URI href) {
+        setHref(href);
+        return this;
+    }
+
+    @Override
+    public InputValidationProblem detail(String detail) {
+        setDetail(detail);
+        return this;
+    }
+
+    @Override
+    public InputValidationProblem instance(URI instance) {
+        setInstance(instance);
+        return this;
+    }
+
+    @Override
+    public InputValidationProblem additionalProperty(String name, Object value) {
+        setAdditionalProperty(name, value);
+        return this;
+    }
+
+    public InputValidationProblem issues(InputValidationIssue... issues) {
+        setIssues(issues);
+        return this;
+    }
+
+    public InputValidationProblem issues(List<InputValidationIssue> issues) {
+        setIssues(issues);
+        return this;
+    }
+
     @Override
     public String getMessage() {
         StringBuilder message = new StringBuilder(super.getMessage());

belgif-rest-problem/src/main/java/io/github/belgif/rest/problem/api/Problem.java

@@ -118,6 +118,28 @@ public void setAdditionalProperty(String name, Object value) {
         additionalProperties.put(name, value);
     }
 
+    // fluent properties
+
+    public Problem href(URI href) {
+        setHref(href);
+        return this;
+    }
+
+    public Problem detail(String detail) {
+        setDetail(detail);
+        return this;
+    }
+
+    public Problem instance(URI instance) {
+        setInstance(instance);
+        return this;
+    }
+
+    public Problem additionalProperty(String name, Object value) {
+        setAdditionalProperty(name, value);
+        return this;
+    }
+
     /**
      * Returns the problem message, consisting of the problem title, followed by the detail message (if present).
      *

belgif-rest-problem/src/test/java/io/github/belgif/rest/problem/api/InputValidationProblemTest.java

@@ -109,6 +109,13 @@ void addInvalidParam() {
         assertThat(problem.getInvalidParams()).isUnmodifiable().containsExactly(invalidParam);
     }
 
+    @Test
+    void fluentProperties() {
+        InputValidationProblem problem = new MyInputValidationProblem()
+                .detail("detail message")
+                .issues(InputValidationIssues.requiredInput(InEnum.QUERY, "test"));
+    }
+
     @Test
     void equalsHashCodeToString() {
         InputValidationIssue issue = new InputValidationIssue(InEnum.QUERY, "test");