n8fr8
commented
2 years ago As stated in the CompletableFuture reference, it is only available after API level 24, so if your requirements require sdk 23 you cannot use that class.
However there are two roughly equivalent classes available to you:
Guava\androidx.concurrent's ListenableFuture: https://developer.android.com/jetpack/androidx/releases/concurrent + https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-guava/ kotlinx.coroutines's Deferred/CompletableDeferred: https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/-completable-deferred/index.html
2022-03-18 12:19:39.412 2823-2929/org.torproject.android E/AndroidRuntime: FATAL EXCEPTION: pool-5-thread-1 Process: org.torproject.android, PID: 2823 java.lang.NoClassDefFoundError: Failed resolution of: Ljava/util/concurrent/CompletableFuture; at org.xbill.DNS.NioUdpClient.sendrecv(NioUdpClient.java:156) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:371) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:338) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:302) at org.xbill.DNS.Resolver$-CC.$default$send(Resolver.java:152) at org.xbill.DNS.SimpleResolver.send(SimpleResolver.java) at org.torproject.android.service.vpn.DNSResolver.processDNS(DNSResolver.java:22) at org.torproject.android.service.vpn.RequestPacketHandler.run(RequestPacketHandler.java:33) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818) Caused by: java.lang.ClassNotFoundException: Didn't find class "java.util.concurrent.CompletableFuture" on path: DexPathList[[zip file "/data/app/org.torproject.android-1/base.apk"],nativeLibraryDirectories=[/data/app/org.torproject.android-1/lib/x86_64, /data/app/org.torproject.android-1/base.apk!/lib/x86_64, /vendor/lib64, /system/lib64]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at org.xbill.DNS.NioUdpClient.sendrecv(NioUdpClient.java:156) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:371) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:338) at org.xbill.DNS.SimpleResolver.sendAsync(SimpleResolver.java:302) at org.xbill.DNS.Resolver$-CC.$default$send(Resolver.java:152) at org.xbill.DNS.SimpleResolver.send(SimpleResolver.java) at org.torproject.android.service.vpn.DNSResolver.processDNS(DNSResolver.java:22) at org.torproject.android.service.vpn.RequestPacketHandler.run(RequestPacketHandler.java:33) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818) Suppressed: java.lang.ClassNotFoundException: java.util.concurrent.CompletableFuture at java.lang.Class.classForName(Native Method) at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at java.lang.ClassLoader.loadClass(ClassLoader.java:504) ... 12 more