stdlib | ✨ | Math library

change build gradle to this :

Bintray and JCenter is not supported yet

Remove all Bintray and JCenter repository configure in your gradle file. And use mavenCentral() instead.

Here is the solution:

I'm not sure what you're using to code, but in order to set it in Android Studio, open the manifest of your project and under the "activity" section, put android:exported="true"(or false if that is what you prefer). I have attached an example.

I managed to fix this by upgrading compileSdk to 31 and kotlin gradle plugin to 1.5.10

Add mavenCentral() in Build Script

I don't know if it is critical for your problem but modifying this

It looks like GCC's naïveté about store-forwarding stalls is hurting its auto-vectorization strategy here. See also Store forwarding by example for some practical benchmarks on Intel with hardware performance counters, and What are the costs of failed store-to-load forwarding on x86? Also Agner Fog's x86 optimization guides.

(gcc -O3 enables -ftree-vectorize and a few other options not included by -O2, e.g. if-conversion to branchless cmov, which is another way -O3 can hurt with data patterns GCC didn't expect. By comparison, Clang enables auto-vectorization even at -O2, although some of its optimizations are still only on at -O3.)

It's doing 64-bit loads (and branching to store or not) on pairs of ints. This means, if we swapped the last iteration, this load comes half from that store, half from fresh memory, so we get a store-forwarding stall after every swap. But bubble sort often has long chains of swapping every iteration as an element bubbles far, so this is really bad.

(Bubble sort is bad in general, especially if implemented naively without keeping the previous iteration's second element around in a register. It can be interesting to analyze the asm details of exactly why it sucks, so it is fair enough for wanting to try.)

Anyway, this is pretty clearly an anti-optimization you should report on GCC Bugzilla with the "missed-optimization" keyword. Scalar loads are cheap, and store-forwarding stalls are costly. (Can modern x86 implementations store-forward from more than one prior store? no, nor can microarchitectures other than in-order Atom efficiently load when it partially overlaps with one previous store, and partially from data that has to come from the L1d cache.)

Even better would be to keep buf[x+1] in a register and use it as buf[x] in the next iteration, avoiding a store and load. (Like good hand-written asm bubble sort examples, a few of which exist on Stack Overflow.)

If it wasn't for the store-forwarding stalls (which AFAIK GCC doesn't know about in its cost model), this strategy might be about break-even. SSE 4.1 for a branchless pmind / pmaxd comparator might be interesting, but that would mean always storing and the C source doesn't do that.

If this strategy of double-width load had any merit, it would be better implemented with pure integer on a 64-bit machine like x86-64, where you can operate on just the low 32 bits with garbage (or valuable data) in the upper half. E.g.,

The very links you included in your question allow you to see the source code of each implementation which tells you that, no, there is no difference.

In fact elementAtOrNull literally just calls getOrNull.

Update: These issues have been fixed, and a patched version of jdeps is available as part of the early access build for JDK 18 at: http://jdk.java.net/18/ (starting from build 26)

Turning my comments into an answer. There seem to be 3 bugs going on here:

1. The MultiReleaseException seems to be because jdeps can not handle classes in different jars that have the same name, such as module-info.class, but are stored in a different META-INF/versions/xxx directory. (JDK-8277165)
2. The fact that this exception is sometimes suddenly not occuring seems to be the result of a race condition in the code that checks for the above; classes of the same name having multiple versions. (JDK-8277166)
3. The MultiReleaseException is missing it's exception message since it's thrown as part of an asynchronous task, which wraps it in an ExecutionException, which then leads to jdeps not reporting the exception correctly. (JDK-8277123)

As for a workaround, I don't think there's a good one at this point, except maybe for editing all the jars on the class path so that they put the module-info.class in the same META-INF/versions/xxx directory (but, this might have other consequences as well, so you probably don't want to run with the edited jars, and only use them for jdeps).