Could you please add support of java.time as is part of Java8 ?

[CyborTronik]

Hi,
Could you please make builtin support of JodaTime types as is included in Java and no needs for separate library?

[JakeWharton]

Note: JodaTime and JSR310 are very different things.

On Fri, Nov 20, 2015 at 1:55 PM CyborTronik [email protected]
wrote:

Hi,
Could you please make builtin support of JodaTime types as is included in
Java and no needs for separate library?

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#739.

[inder123]

minimum supported version of Java in Gson is Java 5. The next version will bump it up to Java 6.
We don't intend to require Java 8 any time soon.

Is there a way this can be supported without bumping up the minimum supported version?

[JakeWharton]

I would guess a peer library built against Java 8 which just provides a
TypeAdapterFactory for javax.time.

On Sat, Nov 21, 2015 at 2:50 PM inder123 [email protected] wrote:

minimum supported version of Java in Gson is Java 5. The next version will
bump it up to Java 6.
We don't intend to require Java 8 any time soon.

Is there a way this can be supported without bumping up the minimum
supported version?

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#739 (comment).

[kang0921ok]

Hi I hava a question.
Not supported yet?
What is recommended method use a jsr310 in gson?

I searched this url : https://github.com/google-gson/typeadapters
It is best method?

[RockyMM]

Is this issue still relevant (after all these years)?

EDIT: I guess it is until java8 is the minimum version supported

gson/pom.xml

Line 30 in 827e117

<javaVersion>7</javaVersion>

[Mario-Eis]

According to Oracle (https://www.oracle.com/java/technologies/java-se-support-roadmap.html), even the extended support for Java 7 ended in July 2022.

[RockyMM]

@Mario-Eis I guess this does not matter. There are many clients of this library still using Java 7. I would guess that there are a lot or some very important internal Google projects that use Java 7. Until the gson in whole drops Java 7 support, there won't be any progress here.

More info #2018

[joannakotula]

Until gson supports java.time properly it will not fully support java 17. We are currently migrating to java 17, and it seems that we will have to replace all gson calls, as we use java.time a lot:

com.google.gson.JsonIOException: Failed making field 'java.time.Duration#seconds' accessible; either increase its visibility or write a custom TypeAdapter for its declaring type.

[ca-chan-ka]

Workaround: Create a gson instance with custom adapters like this

import java.lang.reflect.Type;
import java.time.*;
import java.util.Map;
import java.util.function.Function;
import com.google.gson.*;
​
public class GsonWithJavaTime {
    public static Gson getInstance() {
        GsonBuilder builder = new GsonBuilder();
        Map<Type, Function<String, Object>> parsers = Map.of(
                ZonedDateTime.class, ZonedDateTime::parse,
                LocalDate.class, LocalDate::parse,
                LocalDateTime.class, LocalDateTime::parse
        );
        parsers.entrySet().forEach(entry -> builder.registerTypeAdapter(entry.getKey(), adapter(entry.getValue())));
        return builder.create();
    }
​
    private static <T> JsonDeserializer<T> adapter(Function<String, T> function) {
        return (element, type, context) -> function.apply(element.getAsJsonPrimitive().getAsString());
    }
}