An illegal reflective access operation has occurred

[marcospassos]

Hello,

I'm facing the following error trying to serialize a class using mixins in Java 8:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.fasterxml.jackson.databind.util.ClassUtil (file:/jackson-databind/2.9.8/jackson-databind-2.9.8.jar) to field java.time.Duration.seconds
WARNING: Please consider reporting this to the maintainers of com.fasterxml.jackson.databind.util.ClassUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

@JsonAutoDetect(
    fieldVisibility = Visibility.NONE,
    creatorVisibility = Visibility.NONE,
    getterVisibility = Visibility.NONE,
    setterVisibility = Visibility.NONE,
    isGetterVisibility = Visibility.NONE
)
public abstract class DurationMixin {
    @JsonCreator
    public static Duration ofSeconds(
        @JsonProperty("seconds")
        final long seconds,
        @JsonProperty("nano")
        final long nanoAdjustment
    ) {
        return null;
    }

    @JsonProperty("seconds")
    abstract long getSeconds();

    @JsonProperty("nano")
    abstract int getNano();
}

final ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule("MyModule", new Version(1, 0, 0, null));
mapper.addMixIn(Duration.class, DurationMixin.class);
mapper.readerFor(Duration.class).readValue(mapper.writeValueAsString(Duration.ofDays(1)));

Any guess on how to fix it?

[GedMarc]

That's a Java9^ error xD In Java 8 you won't get that.
V3 I believe? or 2.10,

I solved the problem for jaxb and annotations btw @cowtowncoder

https://search.maven.org/artifact/com.jwebmp.thirdparty/javax.activation/0.67.0.5/jar
Including this as optional/provided will build correctly leaving it the consumer to specify which library to use,

sadly https://mvnrepository.com/artifact/jakarta.annotation/jakarta.annotation-api/1.3.4 is unusable, and not planned for any jpms (jakarta jdk 8 only)

[cowtowncoder]

@GedMarc ok so wrt JAXB module, what exactly needs to be added and where (in pom.xml vs class-info for Moditect)?

[GedMarc]

@cowtowncoder If you are happy with that I can finish the osgi and guice ones for you quickly

[cowtowncoder]

With 2.10.0.pr2, we should have module-info so hopefully that helps.

Otherwise more info would be needed; may be reopened if this is still a problem.

[cowtowncoder]

Looks like there are other similar issues, see #2464