Merge pull request #18757 from dvohra16/master

BAEL-9407 Deserializing Null Strings as Empty Strings in Jackson

Author: xaeldung

jackson-modules/jackson-core/src/main/java/com/baeldung/jackson/defaultvalues/SetterDefaultValueAsEmptyString.java

@@ -0,0 +1,27 @@
+package com.baeldung.jackson.defaultvalues;
+
+public class SetterDefaultValueAsEmptyString {
+
+    private String required;
+    private String optional = "valueIfMissingEntirely";
+
+    public void setOptional(String optional){
+        if(optional == null){
+            this.optional = "";
+        }
+    }
+
+    public String getRequired() {
+        return required;
+    }
+
+    public String getOptional() {
+        return optional;
+    }
+
+    @Override
+    public String toString() {
+        return "NonAnnotatedDefaultValue{" + "required='" + required + '\'' + ", optional='" + optional + '\'' + '}';
+    }
+
+}

jackson-modules/jackson-core/src/test/java/com/baeldung/jackson/defaultvalues/DefaultValuesUnitTest.java

@@ -25,6 +25,15 @@ public void givenAClassWithASetter_whenReadingJsonWithNullOptionalValue_thenExpe
         assert(createdObject.getOptional()).equals("valueIfNull");
     }
 
+    @Test
+    public void givenAClassWithASetter_whenReadingJsonWithNullOptionalValue_thenEmptyStringInResult() throws JsonProcessingException {
+        String nullOptionalField = "{\"required\": \"value\", \"optional\": null}";
+        ObjectMapper objectMapper = new ObjectMapper();
+        SetterDefaultValueAsEmptyString createdObject = objectMapper.readValue(nullOptionalField, SetterDefaultValueAsEmptyString.class);
+        assert(createdObject.getRequired()).equals("value");
+        assert(createdObject.getOptional()).equals("");
+    }
+
     @Test
     public void givenAClassWithAJsonSetterNullsSkip_whenReadingJsonWithNullOptionalValue_thenExpectDefaultValueInResult() throws JsonProcessingException {
         String nullOptionalField = "{\"required\": \"value\", \"optional\": null}";