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Description
Hi.
I'm using gson 2.8.8 with jdk 17. This code:
import com.google.gson.Gson;
import org.junit.jupiter.api.Test;
import java.time.Instant;
class DTO {
private Instant instant;
}
public class GsonTest {
@Test
public void test() {
var gson = new Gson();
var dto = gson.fromJson("{}", DTO.class);
}
}
Fails with exception:
java.lang.reflect.InaccessibleObjectException: Unable to make field private final long java.time.Instant.seconds accessible: module java.base does not "opens java.time" to unnamed module @73035e27
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:354)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:178)
at java.base/java.lang.reflect.Field.setAccessible(Field.java:172)
at com.google.gson.internal.reflect.UnsafeReflectionAccessor.makeAccessible(UnsafeReflectionAccessor.java:44)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:159)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:117)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:166)
at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:102)
at com.google.gson.Gson.getAdapter(Gson.java:458)
at com.google.gson.Gson.fromJson(Gson.java:931)
at com.google.gson.Gson.fromJson(Gson.java:897)
at com.google.gson.Gson.fromJson(Gson.java:846)
at com.google.gson.Gson.fromJson(Gson.java:817)
at com.test.GsonTest.test(GsonTest.java:17)
Activity
Marcono1234 commentedon Oct 18, 2021
See #1979 (comment) or related issues. You are deserializing (maybe by accident) an internal field of a JDK class; you have to write a custom
TypeAdapteror you could try third-party libraries such as https://github.com/gkopff/gson-javatime-serialisers adding support forjava.timeclasses.Or4ng3 commentedon Oct 18, 2021
Yes, the problem with class java.time.Instant (it's the only field in example). Also I see same problem with LocalDate and LocalTime classes.
However, I think that java.time package should be supported since its classes are newer and better than java.util.Date
Marcono1234 commentedon Oct 18, 2021
See #1059