How Can I Use @JsonIgnore to Control Serialization Without Blocking Deserialization?

JsonIgnore Annotation for Controlled Serialization and Deserialization

When dealing with sensitive data in user objects, it's essential to prevent their exposure during serialization. The @JsonIgnore annotation serves this purpose, but can inadvertently block deserialization.

Deserialization Issue with @JsonIgnore

In this scenario, the @JsonIgnore annotation on the password property prevents its serialization to the client. However, it also blocks the property from being deserialized with the correct password, making signups challenging.

Solution for Selective Ignorance

Depending on the Jackson version, two approaches can be used:

Jackson versions prior to 1.9:

• Add @JsonIgnore to the getter method only.
• Add a specific @JsonProperty annotation with the JSON field name to the password setter method.

Jackson versions 1.9 and above:

• Add @JsonProperty(access = JsonProperty.Access.WRITE_ONLY) to the password field in the class.

Sample Code:

In Java:

@JsonIgnore(serialize = true, deserialize = false)
private String password;

@JsonProperty("password")
private void setPassword(String password) {
    this.password = password;
}

This approach allows @JsonIgnore to be applied only during serialization, permitting the password to be correctly deserialized while protecting it from unintended exposure.

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