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Unable to use in Android 23 due to noclassdeffounderror: ljava/util/optional

See original GitHub issue

Issue: Unable to use (iota-java:1.0.0-beta2) on Android API < 24 due to the usage of java.util.Optional in Signing.java

There is still a considerable percentage (~22%) of Android users on API 23 Marshmallow. It would be great to set the compatibility, so, that there will be no surprises on Android.

E/AndroidRuntime: FATAL EXCEPTION: main
    Process: amiin.bazouk.application.com.demo_bytes_android, PID: 3110
    java.lang.NoClassDefFoundError: Failed resolution of: Ljava/util/Optional;
        at jota.utils.Signing.<init>(Signing.java:30)
        at jota.utils.IotaAPIUtils.newAddress(IotaAPIUtils.java:39)
        at jota.IotaAPI.generateNewAddresses(IotaAPI.java:148)
        at jota.IotaAPI.getNextAvailableAddress(IotaAPI.java:81)
        at amiin.bazouk.application.com.demo_bytes_android.iota.Iota.getCurrentAddress(Iota.java:88)
        at amiin.bazouk.application.com.demo_bytes_android.iota.Account.getCurrentAddress(Account.java:85)
        at amiin.bazouk.application.com.demo_bytes_android.MainActivity.getBalance(MainActivity.java:762)
        at amiin.bazouk.application.com.demo_bytes_android.MainActivity.access$1600(MainActivity.java:61)
        at amiin.bazouk.application.com.demo_bytes_android.MainActivity$6.onClick(MainActivity.java:244)
        at android.view.View.performClick(View.java:5198)

Issue Analytics

State:
Created 5 years ago
Comments:10 (5 by maintainers)

Top GitHub Comments

1reaction

ezieneckercommented, May 20, 2020

@kwek20 No feedback on this topic for almost a year and a half. Can’t we close the ticket?

0reactions

kwek20commented, Nov 19, 2018

Hey @pasupulaphani,

I see in the StreamSupport issue, they mentioned ProGuard. Did you try that? Seems to be a good solution, we wont need to go backwards or implement a library, and you can use it in android <24.

If you make a new jar out of our latest release, using ProGuard, and link to that jar when building for Android, that seems to solve the problem.

Otherwise it would be in the 1.0.0 final release, no ETA yet though, we are still scoping functionality.

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