[Scala] Plasma client for java not connecting

[ALBERTO Bocchinfuso]

Hi all,

It’s a while I’m trying to connect to a plasma store via scala.
I’m using the arrow Java API from scala, but if I use the classes in 
org.apache.arrow.plasma, I cannot reach the host.
I even tried to start the process before attempt to connect from the same 
program, similarly to:
https://github.com/apache/arrow/blob/master/java/plasma/src/test/java/org/apache/arrow/plasma/PlasmaClientTest.java

But I cannot reach the host either way. I post the code I wrote in the 
following:

import java.io.IOException;
import org.apache.arrow.plasma.PlasmaClient;

object TestPlasma {
    def main(args: Array[String]) {
        val builder = new ProcessBuilder("plasma_store", "-m", "268435456", 
"-s", "test");
        try {
            println(builder.start());
            println("Start process " + " OK");
        } catch  {
            case ex: IOException =>
                ex.printStackTrace();
        }

        val plasmaClient = new PlasmaClient("test","",1000);
    }
}

>From the execution I get:

java.lang.UNIXProcess@1b39dcee
Start process  OK
[error] (run-main-7) java.lang.UnsatisfiedLinkError: 
org.apache.arrow.plasma.PlasmaClientJNI.connect(Ljava/lang/String;Ljava/lang/String;I)J
[error] java.lang.UnsatisfiedLinkError: 
org.apache.arrow.plasma.PlasmaClientJNI.connect(Ljava/lang/String;Ljava/lang/String;I)J
[error]             at org.apache.arrow.plasma.PlasmaClientJNI.connect(Native 
Method)
[error]             at 
org.apache.arrow.plasma.PlasmaClient.<init>(PlasmaClient.java:43)
[error]             at TestPlasma$.main(plasma_test.scala:15)
[error]             at TestPlasma.main(plasma_test.scala)
[error]             at sun.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
[error]             at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error]             at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error]             at java.lang.reflect.Method.invoke(Method.java:498)
[error]             at sbt.Run.invokeMain(Run.scala:93)
[error]             at sbt.Run.run0(Run.scala:87)
[error]             at sbt.Run.execute$1(Run.scala:65)
[error]             at sbt.Run.$anonfun$run$4(Run.scala:77)
[error]             at 
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error]             at 
sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:10)
[error]             at sbt.TrapExit$App.run(TrapExit.scala:252)
[error]             at java.lang.Thread.run(Thread.java:745)
[error] java.lang.RuntimeException: Nonzero exit code: 1
[error]             at sbt.Run$.executeTrapExit(Run.scala:124)
[error]             at sbt.Run.run(Run.scala:77)
[error]             at sbt.Defaults$.$anonfun$bgRunTask$5(Defaults.scala:1185)
[error]             at 
sbt.Defaults$.$anonfun$bgRunTask$5$adapted(Defaults.scala:1180)
[error]             at 
sbt.internal.BackgroundThreadPool.$anonfun$run$1(DefaultBackgroundJobService.scala:366)
[error]             at 
scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12)
[error]             at scala.util.Try$.apply(Try.scala:209)
[error]             at 
sbt.internal.BackgroundThreadPool$BackgroundRunnable.run(DefaultBackgroundJobService.scala:289)
[error]             at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
[error]             at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
[error]             at java.lang.Thread.run(Thread.java:745)
[error] (Compile / run) Nonzero exit code: 1

If I try to reach the plasma store I start in the code above with a python 
script, I reach it without any problem.

Thank you in advance and sorry if I write both in dev and user, but I had many 
problems in subscribing to user, I haven’t understood if this mailing list is 
up and ready or not.

Alberto