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Can't run jar file of JavaFx application on Linux [duplicate]

I'm trying to create a JFX11 self-containing jar using maven dependencies. From the research I've done, it seems the best way to do this is through the maven shade plugin. However, When I run it, I get the this error:
Error: JavaFX runtime components are missing, and are required to run this application
I don't understand why this is happening. What am I messing up? Is there a better way to do this? I've also tried the maven assembly plugin with the same message.
pom file for reference
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Application</groupId>
<artifactId>Main</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>SpaceRunner</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>11</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
<configuration>
<release>10</release>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>Application.Main</mainClass>
</configuration>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<configuration>
<archive>
<manifest>
<mainClass>
Application.Main
</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>Application.Main</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

UPDATE 10/2021
Since JavaFX 16 a warning is displayed when JavaFX doesn't run on the module path, which is the case of an uber/fat jar:
$ java -jar myFatJar-1.0-SNAPSHOT.jar
Oct 02, 2021 1:45:21 PM com.sun.javafx.application.PlatformImpl startup
WARNING: Unsupported JavaFX configuration: classes were loaded from 'unnamed module #14c24f4c'
Also, you get a warning from the shade plugin itself:
[WARNING] Discovered module-info.class. Shading will break its strong encapsulation.
While these warnings can be initially ignored, there is a reason for them.
As explained in this CSR:
JavaFX is built and distributed as a set of named modules, each in its own modular jar file, and the JavaFX runtime expects its classes to be loaded from a set of named javafx.* modules, and does not support loading those modules from the classpath.
And:
when the JavaFX classes are loaded from the classpath, it breaks encapsulation, since we no longer get the benefit of the java module system.
Therefore, even this widely accepted answer explains how can an uber/fat jar can be created on Maven projects, its use is discouraged, and other modern alternatives to distribute your application, like jlink, jpackage or native-image, should be used.
ORIGINAL ANSWER
This answer explains why a fat/uber jar fails on JavaFX 11. In short:
This error comes from sun.launcher.LauncherHelper in the java.base module. The reason for this is that the Main app extends Application and has a main method. If that is the case, the LauncherHelper will check for the javafx.graphics module to be present as a named module. If that module is not present, the launch is aborted.
And already proposes a fix for Gradle.
For Maven the solution is exactly the same: provide a new main class that doesn't extend from Application.
You will have new class in your application package (bad name):
// NewMain.java
public class NewMain {
public static void main(String[] args) {
Main.main(args);
}
}
And your existing Main class, as is:
//Main.java
public class Main extends Application {
#Override
public void start(Stage stage) {
...
}
public static void main(String[] args) {
launch(args);
}
}
Now you need to modify your pom and set your main class for the different plugins:
<mainClass>application.NewMain</mainClass>
Platform-specific Fat jar
Finally, with the shade plugin you are going to produce a fat jar, on your machine.
This means that, so far, your JavaFX dependencies are using a unique classifier. If for instance you are on Windows, Maven will be using internally the win classifier. This has the effect of including only the native libraries for Windows.
So you are using:
org.openjfx:javafx-controls:11
org.openjfx:javafx-controls:11:win
org.openjfx:javafx-graphics:11
org.openjfx:javafx-graphics:11:win <-- this contains the native dlls for Windows
org.openjfx:javafx-base:11
org.openjfx:javafx-base:11:win
Now, if you produce the fat jar, you will bundle all those dependencies (and those other regular third party dependencies from your project), and you will be able to run your project as:
java -jar myFatJar-1.0-SNAPSHOT.jar
While this is very nice, if you want to distribute you jar, be aware that this jar is not cross-platform, and it will work only on your platform, in this case Windows.
Cross-Platform Fat Jar
There is a solution to generate a cross-platform jar that you can distribute: include the rest of the native libraries of the other platforms.
This can be easily done, as you just need to include the graphics module dependencies for the three platforms:
<dependencies>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-controls</artifactId>
<version>11</version>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-graphics </artifactId>
<version>11</version>
<classifier>win</classifier>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-graphics </artifactId>
<version>11</version>
<classifier>linux</classifier>
</dependency>
<dependency>
<groupId>org.openjfx</groupId>
<artifactId>javafx-graphics </artifactId>
<version>11</version>
<classifier>mac</classifier>
</dependency>
</dependencies>
Size
There is a main issue with this approach: the size. As you can see in this other answer, if you use the WebView control, you will be bundling around 220 MB due to the WebKit native libraries.

JAR under EAR(src/main/application/lib) are not part of ClassPath in Maven - [Resolved]

I am working on converting a J2EE application to Maven where the EAR project will contain a WAR module. I have followed the below URL to convert the project and it does work with some minor changes:
https://www.ibm.com/docs/en/wasdtfe?topic=projects-converting-existing-maven
In the current project, there are some libraries under the EAR folder which I cannot move to the local maven repository. The reason is old legacy code which expects these library names to be intact (myCommon.jar and no version to be added like myCommon-1.0.jar).
As a workaround, I placed these libs under EAR->src->main->application->lib folder. There is no build failure observed but the major problem is with the ClassPath for these EAR lib files as shown below:
[err] java.lang.ClassNotFoundException: com.myClass.classFromWAR
[err] at java.lang.Class.forNameImpl(Native Method)
[err] at java.lang.Class.forName(Class.java:332)
E.g. myCommon.jar contains code like the below:
public void EARLibFunc( string classNameFromWAR){
.........
//E.g. classNameFromWAR = "com.myClass.classFromWAR";
final Class warClass = Class.forName( classNameFromWAR );
.........
}
Calling above function from the java files inside WAR module reports ClassNotFoundException: EARLibFunc("com.myClass.classFromWAR");
The directory structure looks like the below:
WARProject
-src
----com
--------myClass
------------classFromWAR.java
EARProject
-src
----main
--------application
------------lib
----------------myCommon.jar
The jar files from EAR/src/main/application don't seem to be part of the ClassPath.
Can you please suggest the best practice to handle such an issue? What should be the correct layout of the EAR libraries to make it part of the ClassPath? Please be informed that the code from the EAR libraries cannot be changed (legacy code dependency issue).
For reference here are my pom settings:
WARProject pom.xml:
.......
.......
<groupId>MyApp</groupId>
<artifactId>MyApp</artifactId>
<version>3.5</version>
<packaging>war</packaging>
<description>MyApp Maven</description>
........
<build>
<resources>
<resource>
<directory>Java Source</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<warSourceDirectory>Web Content</warSourceDirectory>
</configuration>
</plugin>
</plugins>
</build>
......
EAR Project pom.xml (contains WAR module as dependency):
.....
<groupId>EARProject_EAR</groupId>
<artifactId>EARProject_EAR</artifactId>
<version>3.5</version>
<packaging>ear</packaging>
<description>My Project EAR</description>
<build>
<plugins>
<plugin>
<artifactId>maven-ear-plugin</artifactId>
<version>2.10</version>
<configuration>
<version>7</version>
<skinnyWars>true</skinnyWars>
<defaultLibBundleDir>lib</defaultLibBundleDir>
<archive>
<manifest>
<addDefaultImplementationEntries>true</addDefaultImplementationEntries>
<addClasspath>true</addClasspath>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>MyApp</groupId>
<artifactId>MyApp</artifactId>
<version>3.5</version>
<type>war</type>
</dependency>
</dependencies>
......
SOLUTION:
The crash reported for the CLASSPATH is resolved. Since I am moving an old legacy application to Maven, there were some old references to be cleaned-up. Below changes were required:
There were duplicate classpath references in the eclipse Project
(Project -> Properties -> Java Build Path). Even though I had
dependencies mentioned in the pom.xml of the WAR file, the project
properties were also having its references. This may or may not be
the real reason.
Reverted earlier workaround solution. Removed libraries from
EAR->src-main->application->lib and added those as dependency in the
WAR pom.xml reference. Though it has re-created other legacy issue
but I believe this will adhere to the best practices.

I think, it should be possible this way:
Install the jar in your local maven repository.
Configure the maven-ear-plugin to include third party libraries as shown here.
Add <bundleFileName>myCommon.jar</bundleFileName> to jarModule in order to give your JAR file the desired name within the EAR.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<version>3.2.0</version>
<configuration>
[...]
<modules>
<jarModule>
<groupId>artifactGroupId</groupId>
<artifactId>artifactId</artifactId>
<includeInApplicationXml>true</includeInApplicationXml>
<bundleFileName>myCommon.jar</bundleFileName>
</jarModule>
</modules>
</configuration>
</plugin>
</plugins>
</build>
More information can be found at the usage page of the plugin.

Confluence plugin: How to export properly packages?

I'm developing my first confluence plugin. The plugin contains some macros which are using rest clients. During execution of the macro, some of my classes are not found with ClassNotFound exceptions.
The docu tellms me that i have to export my packages to make them "visible" to the OSGI bundle classloader.
According to docu this could be done either in atlassian-plugin.xml or on the pom file of the module.
My pom file has the following section:
<build>
<plugins>
<plugin>
<groupId>com.atlassian.maven.plugins</groupId>
<artifactId>maven-confluence-plugin</artifactId>
<version>${amps.version}</version>
<extensions>true</extensions>
<configuration>
<productVersion>${confluence.version}</productVersion>
<productDataVersion>${confluence.data.version}</productDataVersion>
<instructions>
<Export-Package>
info.magnolia.confluence.plugin.mib;version="${project.version}",
info.magnolia.confluence.plugin.mib.artifactstore;version="${project.version}",
info.magnolia.confluence.plugin.mib.macro;version="${project.version}",
info.magnolia.confluence.plugin.mib.nexus;version="${project.version}",
info.magnolia.confluence.plugin.mib.nexus.client;version="${project.version}",
info.magnolia.confluence.plugin.mib.nexus.config;version="${project.version}",
info.magnolia.confluence.plugin.mib.nexus.jaxb;version="${project.version}",
info.magnolia.confluence.plugin.mib.util;version="${project.version}"
</Export-Package>
</instructions>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
</plugins>
(For the complete pom see http://pastebin.com/QSJajG8r)
When i check the MANIFEST.MF, it looks "correct", at least i see my exports (and imports have been added automatically), see http://pastebin.com/Gq2aKEYp.
(Well ... the format of the manifest is a bit weird ...)
However, i still encounter the ClassNotFound exception.
Can somebody please explain how exactly i must "export" my packages in a way that the OSGI class loader will find them?

Did you add your dependency?
e.g.,
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-client</artifactId>
<version>1.9</version>
<scope>provided</scope>
</dependency>
Regards,
Gorka

Maven compilation error for android Project "error: package R does not exist "

I am trying to set up a MAVEN project with Android application.
I have this pom file
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.myproject</groupId>
<artifactId>userprofile</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>userprofile</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>com.google.android</groupId>
<artifactId>android</artifactId>
<version>4.1.1.4</version>
<scope>provided</scope>
</dependency>
</dependencies>
</project>
and during MAVEN compile I get this error (about 100 times, ie as many times as it is used in my methods)
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
src\main\java\com\myproject\userprofile\BaseActivity.java:[52,43] error: package R does not exist
Process finished with exit code 1
Any idea about this error? On the web I either find unanswered questions about similar error output. I have no experience on MAVEN, so I believe I am missing something here.

R class is build by your IDE during compilation. MAVEN cannot find the R class because by default the class can be found under build folder. You need to add something like this
<sourceDirectory>build</sourceDirectory>
<outputDirectory>target</outputDirectory>
telling MAVEN that you have some resource files under build folder and you want to make them available to compile so add them under the target folder which will be under your project.
so now I have
build
|----res
|----src
src
|----main
|----java
|----res
target

After a quick look, I believe you're missing the build element. Maven is building the project with current sources, R and other gen classes have not been generated yet. At least you need something like (after dependencies tag):
<build>
<finalName>${project.artifactId}</finalName>
<sourceDirectory>src</sourceDirectory>
<pluginManagement>
<plugins>
<plugin>
<groupId>com.jayway.maven.plugins.android.generation2</groupId>
<artifactId>android-maven-plugin</artifactId>
<version>3.7.0</version>
<extensions>true</extensions>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>com.jayway.maven.plugins.android.generation2</groupId>
<artifactId>android-maven-plugin</artifactId>
<configuration>
<sdk>
<!-- platform or api level (api level 16 = platform 4.1)-->
<platform>16</platform>
</sdk>
</configuration>
</plugin>
</plugins>
</build>
Also the packaging must be apk:
<packaging>apk</packaging>
I would strongly recommend to start reading the Android Maven documentation along with samples.

This error might happen if you had modify the package name that generate by archetype:generate, for me, I use android-quickstart to generate the module structure :
mvn archetype:generate \
-DarchetypeArtifactId=android-quickstart \
-DarchetypeGroupId=de.akquinet.android.archetypes \
-DarchetypeVersion=1.0.11 \
-DgroupId=com.yy.android.gameLibs \
-DartifactId=sample
akquient recommend me to use "com.yy.android.gameLibs" as package name and I accepted, I compile this module successful and worked. After that, I change the package name as "com.yy.android.sample" also change the Androidmenifest.xml package attribute, therefore the module report that error, I follow back the generate command and choice package name myself to solve this.

Modify packaging to apklib, like this:
<packaging>apklib</packaging>
And add build goal at end of pom.xml like this:
<dependencies>
<!--Android deps -->
<dependency>
<groupId>com.google.android</groupId>
<artifactId>android</artifactId>
<version>4.0.1.2</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>com.jayway.maven.plugins.android.generation2</groupId>
<artifactId>android-maven-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<sdk>
<platform>17</platform>
</sdk>
</configuration>
<extensions>true</extensions>
</plugin>
</plugins>
</build>

NoClassDefFoundError on Maven dependency

My first use of Maven and I'm stuck with dependencies.
I created a Maven project with Eclipse and added dependencies, and it was working without problems.
But when I try to run it via command line:
$ mvn package # successfully completes
$ java -cp target/bil138_4-0.0.1-SNAPSHOT.jar tr.edu.hacettepe.cs.b21127113.bil138_4.App # NoClassDefFoundError for dependencies
It downloads dependencies, successfully builds, but when I try to run it, I get NoClassDefFoundError:
Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/jackson/JsonParseException
at tr.edu.hacettepe.cs.b21127113.bil138_4.db.DatabaseManager.<init>(DatabaseManager.java:16)
at tr.edu.hacettepe.cs.b21127113.bil138_4.db.DatabaseManager.<init>(DatabaseManager.java:22)
at tr.edu.hacettepe.cs.b21127113.bil138_4.App.main(App.java:10)
Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.JsonParseException
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
... 3 more
My pom.xml is like this:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>tr.edu.hacettepe.cs.b21127113</groupId>
<artifactId>bil138_4</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>bil138_4</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-core-asl</artifactId>
<version>1.9.6</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.6</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
Can anyone help me?

By default, Maven doesn't bundle dependencies in the JAR file it builds, and you're not providing them on the classpath when you're trying to execute your JAR file at the command-line. This is why the Java VM can't find the library class files when trying to execute your code.
You could manually specify the libraries on the classpath with the -cp parameter, but that quickly becomes tiresome.
A better solution is to "shade" the library code into your output JAR file. There is a Maven plugin called the maven-shade-plugin to do this. You need to register it in your POM, and it will automatically build an "uber-JAR" containing your classes and the classes for your library code too when you run mvn package.
To simply bundle all required libraries, add the following to your POM:
<project>
...
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.4.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
</project>
Once this is done, you can rerun the commands you used above:
$ mvn package
$ java -cp target/bil138_4-0.0.1-SNAPSHOT.jar tr.edu.hacettepe.cs.b21127113.bil138_4.App
If you want to do further configuration of the shade plugin in terms of what JARs should be included, specifying a Main-Class for an executable JAR file, and so on, see the "Examples" section on the maven-shade-plugin site.

when I try to run it, I get NoClassDefFoundError
Run it how? You're probably trying to run it with eclipse without having correctly imported your maven classpath. See the m2eclipse plugin for integrating maven with eclipse for that.
To verify that your maven config is correct, you could run your app with the exec plugin using:
mvn exec:java -D exec.mainClass=<your main class>
Update: First, regarding your error when running exec:java, your main class is tr.edu.hacettepe.cs.b21127113.bil138_4.App. When talking about class names, they're (almost) always dot-separated. The simple class name is just the last part: App in your case. The fully-qualified name is the full package plus the simple class name, and that's what you give to maven or java when you want to run something. What you were trying to use was a file system path to a source file. That's an entirely different beast. A class name generally translates directly to a class file that's found in the class path, as compared to a source file in the file system. In your specific case, the class file in question would probably be at target/classes/tr/edu/hacettepe/cs/b21127113/bil138_4/App.class because maven compiles to target/classes, and java traditionally creates a directory for each level of packaging.
Your original problem is simply that you haven't put the Jackson jars on your class path. When you run a java program from the command line, you have to set the class path to let it know where it can load classes from. You've added your own jar, but not the other required ones. Your comment makes me think you don't understand how to manually build a class path. In short, the class path can have two things: directories containing class files and jars containing class files. Directories containing jars won't work. For more details on building a class path, see "Setting the class path" and the java and javac tool documentation.
Your class path would need to be at least, and without the line feeds:
target/bil138_4-0.0.1-SNAPSHOT.jar:
/home/utdemir/.m2/repository/org/codehaus/jackson/jackson-core-asl/1.9.6/jackson-core-asl-1.9.6.jar:
/home/utdemir/.m2/repository/org/codehaus/jackson/jackson-mapper-asl/1.9.6/jackson-mapper-asl-1.9.6.jar
Note that the separator on Windows is a semicolon (;).
I apologize for not noticing it sooner. The problem was sitting there in your original post, but I missed it.

You have to make classpath in pom file for your dependency. Therefore you have to copy all the dependencies into one place.
Check my blog.
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.1</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/lib</outputDirectory>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>false</overWriteSnapshots>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>$fullqualified path to your main Class</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>

This is due to Morphia jar not being part of your output war/jar. Eclipse or local build includes them as part of classpath, but remote builds or auto/scheduled build don't consider them part of classpath.
You can include dependent jars using plugin.
Add below snippet into your pom's plugins section
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.0.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>

For some reason, the lib is present while compiling, but missing while running.
My situation is, two versions of one lib conflict.
For example, A depends on B and C, while B depends on D:1.0, C depends on D:1.1, maven may
just import D:1.0. If A uses one class which is in D:1.1 but not in D:1.0, a NoClassDefFoundError will be throwed.
If you are in this situation too, you need to resolve the dependency conflict.

I was able to work around it by running mvn install:install-file with -Dpackaging=class. Then adding entry to POM as described here:

Choosing to Project -> Clean should resolve this