[Language Translator] InaccessibleObjectException when fetching supported languages with JDK 16

[BadSkater0729]

Check service status
No current service issues.

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Overview
Using the newly released JDK 16, attempting to get a list of all supported languages with LanguageTranslator.listLanguages() throws an InaccessibleObjectException. Before JDK 16, a reflection access warning would be printed to the console instead, but now it throws an exception and fails to get all supported languages. This seems to be due to the way that Gson is used, as this is also an issue here.

Expected behavior
LanguageTranslator outputs a list of all languages supported by Watson.

Actual behavior
An InaccessibleObjectException is thrown, and the operation fails.

How to reproduce
Make sure you are running JDK 16 or above.
Use the LanguageTranslator class to fetch the languages it supports, such as with the following code:

/* Init credentials */
IamAuthenticator authenticator = new IamAuthenticator.Builder().apikey(System.getProperty("WATSON_API_KEY")).build();
LanguageTranslator translatorService = new LanguageTranslator("2018-05-01", authenticator);
translatorService.setServiceUrl(System.getProperty("WATSON_SERVICE_URL"));

/* Get languages */
Languages allLanguages = translatorService.listLanguages().execute().getResult();

This code will succeed on older JDKs, but fail on 16. The authentication lines throw an InaccessibleObjectException, which can be seen in the screenshots below.

Screenshots

SDK Version
9.2.0 (Latest)

Additional information:

• OS: Ubuntu 21.04
• Java 16.0.1 2021-04-20 (64-Bit Build 16.0.1+9-24)

Additional context
N/A

[kevinkowa]

Thanks, we will look into this!

[stale]

This issue has been automatically marked as stale because it has had no recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[kevinkowa]

Closing this issue since the core team is debugging it. Latest version of the core is using a newer version of gson, try it out with v9.3.1