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BAEL-9407 Deserializing Null Strings as Empty Strings in Jackson #18757

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Merged
merged 5 commits into from
Aug 18, 2025
Merged

BAEL-9407 Deserializing Null Strings as Empty Strings in Jackson #18757

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11331cf
Create SetterDefaultValueAsEmptyString.java
dvohra09 Aug 16, 2025
3310263
Update DefaultValuesUnitTest.java
dvohra09 Aug 16, 2025
52fd7b2
Merge pull request #1 from dvohra09/patch-1
dvohra16 Aug 16, 2025
f747b52
Merge pull request #2 from dvohra09/patch-2
dvohra16 Aug 16, 2025
d025074
Update DefaultValuesUnitTest.java
dvohra16 Aug 16, 2025
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27 changes: 27 additions & 0 deletions ...ore/src/main/java/com/baeldung/jackson/defaultvalues/SetterDefaultValueAsEmptyString.java
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Original file line number Diff line number Diff line change
@@ -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 + '\'' + '}';
}

}
9 changes: 9 additions & 0 deletions .../jackson-core/src/test/java/com/baeldung/jackson/defaultvalues/DefaultValuesUnitTest.java
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Expand Up @@ -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}";
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