How to convert null string to empty string in retrofit2? - retrofit2

Question

Before moving to retrofit2, I was using volley. To set my pojo value, I was using optString and optInt to retrieve value from JSONObject response. This will replace my null string to empty string and I don't need to add null checks for the same. How will do the same with retrofit2.
Example Json:
{
company_name : null
}
Pojo class
public class company implements Serializable{
#SerializedName("company_name")
private String companyName;
public String getCompanyName(){
return companyName;
}
public void setCompanyName(String companyName){
this.companyName = companyName;
}
String companyName = getCompany();
cause NullPointerException.
Is there any way to convert every null string to empty string like optString.?

Answer 1

Make String type adapter similar
public class StringAdapter extends TypeAdapter<String> {
public String read(JsonReader reader) throws IOException {
if (reader.peek() == JsonToken.NULL) {
reader.nextNull();
//here is the point of interest
//instead of return null;
return "";
}
return reader.nextString();
}
public void write(JsonWriter writer, String value) throws IOException {
if (value == null) {
writer.nullValue();
return;
}
writer.value(value);
}
}
for more details read this

Answer 2

about like this; the ternary operator used is the same as if:
public void setCompanyName(String value){
this.companyName = (value==null ? "" : value);
}
or try the Jackson Converter alike JsonParserUtil.toPojo(...) annotated with #JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL) then there shouldn't be any NULL values passed on - while the setter still would crash on NULL values, unless properly sanitized.