or-tool binaries with Maven

[Olivier Giguère-Durand]

Hi, I'm sorry to bother the group for something that must be ridiculously simple, but I'm having issues using the or-tools binaries with Maven builds (the one I'm using being a multi-project with intermingled dependencies).

The binaries themselves work fine with, say, the examples from the command line.

However, once installed with Maven, issues appear.

If I include com.google.ortools.jar , whether through compile, default value or provided, I receive the following error (no matter if I include protobuf.jar in any of the 3 previously mentioned configuration):

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/protobuf/InvalidProtocolBufferException
    at net.<domain>.picrossengine.Solver.<init>(Solver.java:48)
    at net.<domain>.logic.java.MainJava.main(MainJava.java:54)
Caused by: java.lang.ClassNotFoundException: com.google.protobuf.InvalidProtocolBufferException
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more

I'm sure it's something obvious, yet I haven't a lot of experience working with Maven.

The issue is agnostic to 2015 or 2017 binaries. As a side note, does someone know the minimum Java version needed to run the binaries?

Thank you very much for any help you can provide.

[Laurent Perron]

I believe you need to add the path to the native library to maven.

I do now know how to do it, but this is done when I run java examples.

--Laurent

Laurent Perron | Operations Research | lpe...@google.com | (33) 1 42 68 53 00

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[Olivier Giguère-Durand]

Thank you for the time Laurent!

I was always running with the dll in path (else it spewed another error.) But, due to your comment, I looked into packaging it (something I'd have needed to do anyway).
It currently is packaged in the jar and ran internally at runtime.
However, after going through a few errors getting there, it seems I'm right back to the original error. On a side note, installing a Maven version containing the dll is a fun trick and if I can solve this, I'd love to discuss uploading or-tool to Maven!

Thank you again for your time.

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[Olivier Giguère-Durand]

To help, I've created a minimal case:

package net.testproject;

import com.google.ortools.constraintsolver.Solver;
import cz.adamh.utils.NativeUtils;

public class Main {

    static {
            try {
                NativeUtils.loadLibraryFromJar("/jniortools.dll"); // during runtime. .DLL within .JAR
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
    }

    static public void main(String[] args) {
        Solver solver = new Solver("test");
    }
}

and within the maven pom.xml, for the dependencies:

    <dependencies>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>NativeUtils</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>protobuf</artifactId>
            <version>${project.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>or_tool</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>${project.groupId}</groupId>
            <artifactId>jniortools</artifactId>
            <version>${project.version}</version>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

I hope it helps someone see my mistake. Thank you!