$ git clone https://github.com/physion/osx-keychain-java
$ mvn install
$ cp dist/osxkeychain.jar ~/myproject/external

<dependency>
  <groupId>us.physion</groupId>
  <artifactId>osx-keychain</artifactId>
  <version>1.0</version>
  <scope>system</scope>
  <systemPath>${project.basedir}/external/osxkeychain.jar</systemPath>
</dependency>

osx-keychain-java$ jshell -cp ./dist/osxkeychain.jar

jshell> import com.mcdermottroe.apple.*;
jshell> OSXKeychain keychain = OSXKeychain.getInstance();
keychain ==> com.mcdermottroe.apple.OSXKeychain@2286778

jshell> keychain.addGenericPassword("aardvark", "a", "b");

jshell> keychain.findGenericPassword("aardvark", "a");
$4 ==> "b"

<dependency>
  <groupId>net.east301</groupId>
  <artifactId>java-keyring</artifactId>
  <version>1.0.0</version>
</dependency>

import net.east301.keyring.Keyring;
import net.east301.keyring.PasswordRetrievalException;

Keyring keyring = Keyring.create();
String pw = keyring.getPassword(service, account);

compile 'pt.davidafsilva.apple:jkeychain:1.0.0'

final OSXKeychain keychain = OSXKeychain.getInstance();
final Optional<String> mySecret = keychain.findGenericPassword("mySecret", "username");