MapDB ClassNotFoundException: kotlin.jvm.internal.Intrinsics

Question

I am trying to run a simple mapdb example, but get the error:

    Exception in thread "main" java.lang.NoClassDefFoundError: kotlin/jvm/internal/Intrinsics
    at org.mapdb.DBMaker.fileDB(DBMaker.kt)
    at leechies.Truc.main(Truc.java:9)
Caused by: java.lang.ClassNotFoundException: kotlin.jvm.internal.Intrinsics
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 2 more

My class:

package leechies;
import java.util.concurrent.ConcurrentMap;

import org.mapdb.DB;
import org.mapdb.DBMaker;

public class Truc {
    public static void main(String[] args) {
        DB db = DBMaker.fileDB("file.db").make();
        ConcurrentMap map = db.hashMap("map").createOrOpen();
        map.put("something", "here");
        db.close();
    }
}

My pomx.xml

<dependencies>
    <dependency>
        <groupId>org.mapdb</groupId>
        <artifactId>mapdb</artifactId>
        <version>3.0.3</version>
    </dependency>

I run with rigth click -> Run as... -> java application.

Answer 1

Either kotlin-runtime has to be in classpath and verify with $ echo $CLASSPATH.

Or you have to add kotlin-runtime to maven and then assemble inside the jar itself with mvn compile assembly:single,

<dependency>
    <groupId>org.jetbrains.kotlin</groupId>
    <artifactId>kotlin-runtime</artifactId>
    <version>1.1.3</version>
    <scope>compile</scope>
</dependency>

<dependency>
    <groupId>org.jetbrains.kotlin</groupId>
    <artifactId>kotlin-stdlib</artifactId>
    <version>1.1.3</version>
    <scope>compile</scope>
</dependency>

which need to be attached to artifact as well and can be done with assembly-plugin.

    <plugin>
        <artifactId>maven-assembly-plugin</artifactId>
        <configuration>
            <archive>
                <manifest>
                    <mainClass>event.handlers.InventoryEventHandler</mainClass>
                </manifest>
            </archive>
            <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
            </descriptorRefs>
        </configuration>
    </plugin>

you can verify the kotlin-runtime is added to jar by

$ jar -tf target/amz-wavelength-1.0-SNAPSHOT-jar-with-dependencies.jar | grep kotlin-runtime
META-INF/kotlin-runtime.kotlin_module

or

$ jar -tf target/amz-wavelength-1.0-SNAPSHOT-jar-with-dependencies.jar | grep "kotlin/jvm/internal/*"

Answer 2

It will fail because you do not have the necessary kotlin runtime jar in your classpath. You have to run some command to resolve this error. please refer this link for commands:-

https://dzone.com/articles/exercises-in-kotlin-part-1-getting-started