I might not be using the api correctly, but we're getting collisons for the following case:

var m1 = new Murmur3F();
m1.update(0);
m1.update(-17664);

var m2 = new Murmur3F();
m2.update(0);
m2.update(-16640);

assert !Objects.equals(new UUID(m1.getValueHigh(), m1.getValue()), new UUID(m2.getValueHigh(), m2.getValue()));

Do we need a finalize or something?

JDK 11

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.greenrobot.essentials.PrimitiveArrayUtils$UnsafeImpl (file:/<REDACTED>/essentials-3.0.0-RC1.jar) to method java.nio.Bits.unaligned()
WARNING: Please consider reporting this to the maintainers of org.greenrobot.essentials.PrimitiveArrayUtils$UnsafeImpl
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

I want to extend its functionality (like, direct access to Buffers without copying byte arrays twice), but its fields are private. This forces me to make a copy of the class just to add a few new methods instead of being able to extend it. Can you please change this?

Trying to use Murmur implementation from this library, and got the error for:

        Murmur3A murmur = new Murmur3A();
        murmur.updateUtf8("My test string");

error: cannot find symbol method updateUtf8(String)

Tried with both versions: org.greenrobot:essentials:3.0.0-RC1 and de.greenrobot:java-common:2.3.1

Test file size: 1.09GB

Here is the code:

    try {
        Log.d(TAG, "SHA1");
        Log.d(TAG, FileUtils.getSha1(file));
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        Murmur3F checksum = new Murmur3F(123);
        Log.d(TAG, "murmur");
        FileUtils.updateChecksum(file, checksum);
        Log.d(TAG, "" + checksum.getValueHexString());
    } catch (IOException e) {
        e.printStackTrace();
    }

Here is the result: 09-20 18:18:53.021 D/HashTest: SHA1 09-20 18:19:12.721 D/HashTest: a21321f03c0463927f51f2febaf2ea1e66acff21 09-20 18:19:12.731 D/HashTest: murmur 09-20 18:19:47.951 D/HashTest: 6e838ff35a6d624310df1607cc5892f6

SHA1: ~20s MurmurHash: ~40s

Is this result reasonable?

Question: What is the required minimum java version of the project? Officially, unofficially? It's easy enough to test, but is there a decision regarding this? Looking into using it in an embedded environment where some hardware still only has java 1.5. Looks like the collections, dates, files etc can manage with only 1.5. At least not any 1.7. sun.misc.Unsafe might be an issue but isolated use of that.

Building with proguard enabled would result in this error: PrimitiveArrayUtils$UnsafeImpl: can't find referenced class sun.misc.Unsafe

adding the follow to my proguard configs seemed to help: -dontwarn sun.misc.Unsafe

Why not use LinkedHashMap for the key to preserve order when iterating through the map ?

Or provide a LinkedListMultimap class like

public class LinkedListMultimap<K, V> extends AbstractMultimap<K, V, List<V>> {
	public static <K, V> LinkedListMultimap<K, V> create() {
		return new LinkedListMultimap<>(new LinkedHashMap<K, List<V>>());
	}

	protected LinkedListMultimap(LinkedHashMap<K, List<V>> map) {
		super(map);
	}

	@Override protected List<V> createNewCollection() {
		return new ArrayList<>();
	}
}

I'd be happy to make a PR with this as I'm using this in my own project with great success

Most of the link in README.md section is broken. Like: stream-based IO

Your website says:

For more details, please have a look at the documentation.

But I can't find a visible documentation link anywhere.

I post EventBus.getDefault().post(new SendPlayer(player)); from a services, which is running in non main thread

<service
        android:name=".player.PlayerService"
        android:process=":player"
        android:enabled="true"
        android:exported="true">
    </service>

I expect to recieve even in my fragment

  @Subscribe(threadMode = ThreadMode.MAIN) public void onEvent(SendPlayer event) {
    Log.w("mcheck", "onEvent");
  }

However, i get message D/EventBus: No subscribers registered for event class yarh.com.tryexo.player.SendPlayer. Events are delivered only if i remove android:process=":player". Is it a bug or I misunderstud flow of posting events between bachground thread and main thread?

Using this class, user will be able to directly read integer, long, string, character datatype. it is faster than Scanner class of java.io. In Java programming language, input output stream takes much time than other language. so if we are able to make library which is efficient for input and output, that would be great.

Currently ObjectCache depends on the system time never changing, which is not optimal in a setup where the app runs for a long time, the user or the system might change the time.

a solution would be not to use the time but the uptime of the phone.

https://developer.android.com/reference/android/os/SystemClock#uptimeMillis()