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Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:java

I used 'mvn install' and 'mvn exec:java' to start my project, but the error occurred as the title. What exact 'Mainclass' should I set to 'mojo:exec-maven-plugin'? I tried to delete full m2.repository but it didn't work for me. I also tried to add some code to set the plugin but I don't know what mainclass should I set. Could anyone give me some advise?
my pom file shows below:
<?xml version="1.0" encoding="UTF-8"?>
<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>
<developers>
<developer>
<id>TaehoonK</id>
<name>Taehoon Kim</name>
<email>taehoon.kim#pusan.ac.kr</email>
<organization>Pusan National University</organization>
<roles>
<role>Module Maintainer</role>
<role>Java Developer</role>
</roles>
</developer>
</developers>
<organization>
<name>STEMLab in Pusan National University</name>
<url>http://stem.pnu.edu</url>
</organization>
<properties>
<jar.name>simmApplication</jar.name>
<lib.dir>lib</lib.dir>
</properties>
<groupId>edu.pnu.stem</groupId>
<artifactId>OpenGDS_Conversion</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>
<build>
<plugins>
<!-- ======================================================= -->
<!-- JAR packaging. -->
<!-- ======================================================= -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<finalName>${jar.name}</finalName>
<outputDirectory>${project.basedir}</outputDirectory>
<archive>
<manifest>
<mainClass>edu.pnu.stem.convert.MainForm</mainClass>
<addClasspath>true</addClasspath>
<classpathPrefix>${lib.dir}/</classpathPrefix>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.3</version>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
</execution>
</executions>
<configuration>
<outputDirectory>${project.basedir}/${lib.dir}</outputDirectory>
<overWriteIfNewer>true</overWriteIfNewer>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.6</version>
<inherited>false</inherited>
<executions>
<execution>
<id>copy-resources</id>
<phase>install</phase>
<goals>
<goal>copy-resources</goal>
</goals>
</execution>
</executions>
<configuration>
<encoding>UTF-8</encoding>
<outputDirectory>${basedir}/target</outputDirectory>
<resources>
<resource>
<filtering>true</filtering>
<directory>${basedir}</directory>
<includes>
<include>VERSION.txt</include>
</includes>
</resource>
</resources>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<fork>true</fork>
<encoding>utf-8</encoding>
<maxmem>512M</maxmem>
</configuration>
</plugin>
</plugins>
</build>
</project>

Separate build step for Java file - Maven

Within a larger Maven project, I have a Java file (AudioFileBuilder.java) that generates audio files from the Google Cloud Text-to-Speech service. It can execute from its own main() class; however, this file references an enumeration within the project (that other project source files depend on).
I am creating a fat JAR (JAR-with-dependencies), .exe file (Windows), and .app file (macOS) for the main project. I would like to exclude the AudioFileBuilder.java file AND the associated Google Cloud Text-to-Speech dependency in the JAR, exe, and app files. However, I still need the AudioFileBuilder.java file to run every time the project is built.
Here is a link to my project's current POM file (the project is open-source):
https://github.com/hadi16/GamesForTheBlind/blob/Alex-Branch/pom.xml
This is my current 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/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>edu.up</groupId>
<artifactId>Games_For_Blind</artifactId>
<version>1.0.0.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<packaging>jar</packaging>
<dependencies>
<!-- Compile Dependencies -->
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-texttospeech</artifactId>
<version>0.117.0-beta</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.2</version>
<scope>compile</scope>
</dependency>
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>12</source>
<target>12</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<outputDirectory>${project.build.directory}/dist</outputDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>gamesforblind.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>assemble-all</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>process-classes</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
<resources>
<resource>
<directory>${basedir}/target/xsd-out</directory>
<filtering>false</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<!-- To generate the phrase audio files. -->
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>java</executable>
<arguments>
<argument>-classpath</argument>
<classpath/>
<argument>gamesforblind.synthesizer.AudioFileBuilder</argument>
</arguments>
<environmentVariables>
<GOOGLE_APPLICATION_CREDENTIALS>google_api_key.json</GOOGLE_APPLICATION_CREDENTIALS>
</environmentVariables>
</configuration>
</plugin>
<!-- Create executable Windows file. -->
<plugin>
<groupId>com.akathist.maven.plugins.launch4j</groupId>
<artifactId>launch4j-maven-plugin</artifactId>
<version>1.7.25</version>
<executions>
<execution>
<id>l4j-clui</id>
<phase>package</phase>
<goals>
<goal>launch4j</goal>
</goals>
<configuration>
<headerType>gui</headerType>
<jar>${project.build.directory}/dist/${project.artifactId}-${project.version}-jar-with-dependencies.jar</jar>
<outfile>${project.build.directory}/dist/${project.artifactId}-${project.version}.exe</outfile>
<classPath>
<mainClass>gamesforblind.Main</mainClass>
</classPath>
<jre>
<minVersion>12</minVersion>
<jdkPreference>preferJre</jdkPreference>
</jre>
<versionInfo>
<copyright>2019</copyright>
<fileVersion>${project.version}</fileVersion>
<txtFileVersion>${project.version}</txtFileVersion>
<fileDescription>${project.name}</fileDescription>
<productVersion>${project.version}</productVersion>
<txtProductVersion>${project.version}</txtProductVersion>
<productName>${project.name}</productName>
<internalName>${project.name}</internalName>
<originalFilename>${project.artifactId}-${project.version}.exe</originalFilename>
<companyName>University of Portland</companyName>
</versionInfo>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>de.perdian.maven.plugins</groupId>
<artifactId>macosappbundler-maven-plugin</artifactId>
<version>1.3.0</version>
<configuration>
<plist>
<CFBundleDisplayName>Games For The Blind</CFBundleDisplayName>
<JVMMainClassName>gamesforblind.Main</JVMMainClassName>
<JVMVersion>12</JVMVersion>
<CFBundleDisplayName>Games For The Blind</CFBundleDisplayName>
<CFBundleName>Games For The Blind</CFBundleName>
</plist>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>bundle</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
UPDATE:
I divided the project into two separate modules: "audio-builder" & "application" - as suggested by Welsh.
However, I have a Java enumeration ("Phrases.java") that both the audio-builder & application uses. The audio-builder needs this file to know which audio phrases are currently in the program, while the rest of the application needs this to load in said audio files & call the playback of these files.
So, this made me add the "audio-builder" module as a dependency for the "application" module. Since the Google Cloud dependency is needed at compile-time, this means that it is bundled in the generated JAR, app, and exe files.
These changes can be found here: https://github.com/hadi16/GamesForTheBlind/tree/Maven-Fixes
Root POM file:
<?xml version="1.0" encoding="UTF-8"?>
<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>edu.up</groupId>
<artifactId>games-for-the-blind</artifactId>
<version>1.0.0.0</version>
<modules>
<module>games-for-the-blind/audio-builder</module>
<module>games-for-the-blind/application</module>
</modules>
<packaging>pom</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>
Audio-builder POM file:
<?xml version="1.0" encoding="UTF-8"?>
<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>edu.up</groupId>
<artifactId>audio-builder</artifactId>
<version>1.0.0.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.google.cloud</groupId>
<artifactId>google-cloud-texttospeech</artifactId>
<version>0.117.0-beta</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>12</source>
<target>12</target>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.6.0</version>
<executions>
<execution>
<phase>prepare-package</phase>
<goals>
<goal>exec</goal>
</goals>
</execution>
</executions>
<configuration>
<executable>java</executable>
<arguments>
<argument>-classpath</argument>
<classpath/>
<argument>builder.AudioFileBuilder</argument>
</arguments>
<environmentVariables>
<GOOGLE_APPLICATION_CREDENTIALS>google_api_key.json</GOOGLE_APPLICATION_CREDENTIALS>
</environmentVariables>
</configuration>
</plugin>
</plugins>
</build>
</project>
Application POM file (note the dependency to audio-builder):
<?xml version="1.0" encoding="UTF-8"?>
<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>edu.up</groupId>
<artifactId>application</artifactId>
<version>1.0.0.0</version>
<packaging>jar</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<!-- Compile Dependencies -->
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.2</version>
<scope>compile</scope>
</dependency>
<!-- Test Dependencies -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>edu.up</groupId>
<artifactId>audio-builder</artifactId>
<version>1.0.0.0</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.1</version>
<configuration>
<source>12</source>
<target>12</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.1.1</version>
<configuration>
<outputDirectory>${project.build.directory}/dist</outputDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>gamesforblind.Main</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>assemble-all</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.1.0</version>
<executions>
<execution>
<id>copy-resources</id>
<phase>process-classes</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<outputDirectory>${project.build.outputDirectory}</outputDirectory>
<resources>
<resource>
<directory>${basedir}/target/xsd-out</directory>
<filtering>false</filtering>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
<!-- Create executable Windows file. -->
<plugin>
<groupId>com.akathist.maven.plugins.launch4j</groupId>
<artifactId>launch4j-maven-plugin</artifactId>
<version>1.7.25</version>
<executions>
<execution>
<id>l4j-clui</id>
<phase>package</phase>
<goals>
<goal>launch4j</goal>
</goals>
<configuration>
<headerType>gui</headerType>
<jar>
${project.build.directory}/dist/${project.artifactId}-${project.version}-jar-with-dependencies.jar
</jar>
<outfile>${project.build.directory}/dist/${project.artifactId}-${project.version}.exe
</outfile>
<classPath>
<mainClass>gamesforblind.Main</mainClass>
</classPath>
<jre>
<minVersion>12</minVersion>
<jdkPreference>preferJre</jdkPreference>
</jre>
<versionInfo>
<copyright>2019</copyright>
<fileVersion>${project.version}</fileVersion>
<txtFileVersion>${project.version}</txtFileVersion>
<fileDescription>${project.name}</fileDescription>
<productVersion>${project.version}</productVersion>
<txtProductVersion>${project.version}</txtProductVersion>
<productName>${project.name}</productName>
<internalName>${project.name}</internalName>
<originalFilename>${project.artifactId}-${project.version}.exe</originalFilename>
<companyName>University of Portland</companyName>
</versionInfo>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>de.perdian.maven.plugins</groupId>
<artifactId>macosappbundler-maven-plugin</artifactId>
<version>1.3.0</version>
<configuration>
<plist>
<CFBundleDisplayName>Games For The Blind</CFBundleDisplayName>
<JVMMainClassName>gamesforblind.Main</JVMMainClassName>
<JVMVersion>12</JVMVersion>
<CFBundleDisplayName>Games For The Blind</CFBundleDisplayName>
<CFBundleName>Games For The Blind</CFBundleName>
</plist>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>bundle</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Thank you!

I would recommend that you split your projects into two sub projects, so you would have for example:
games-for-the-blind/
pom.xml
audio-builder/
pom.xml
application/
pom.xml
Then what you can do is have the audio-builder package output the required files into the application/resources directory and have it listed first in the main pom.xml file.
This would allow you to distribute the application resultant files that would not contain any of the details of the audio-builder project.

Java getClass().getClassLoader().getResource(path) fails inside Maven shaded .jar

When running my project directly with java, I can confirm that a particular method is able to fetch a resource via getClass().getClassLoader().getResource(path), where path is docs/info.md and there exists a file at src/main/resources/docs/info.md
After the project is packaged with Maven into the final executable .jar, I can confirm that the path docs/info.md has been included via jar tf myproject.jar
However, when that .jar is executed, the same getClass().getClassLoader().getResource(path) returns null.
Here's myproject.pom:
<?xml version="1.0"?>
<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<!-- io.outright.myproject [parent] -->
<parent>
<groupId>io.outright</groupId>
<artifactId>myproject</artifactId>
<version>1.0-SNAPSHOT</version>
</parent>
<!-- io.outright.myproject -->
<groupId>io.outright.myproject</groupId>
<artifactId>hub</artifactId>
<version>1.0-SNAPSHOT</version>
<name>hub</name>
<!-- props -->
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<!-- deps -->
<dependencies>
<!-- ....removed for readability.... -->
</dependencies>
<!-- build -->
<build>
<resources>
<resource>
<directory>${basedir}/src/main/resources</directory>
<includes>
<include>**/*</include>
</includes>
</resource>
</resources>
<plugins>
<!-- Integration tests -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-failsafe-plugin</artifactId>
<version>2.19</version>
<executions>
<execution>
<id>integration-test</id>
<phase>integration-test</phase>
<goals>
<goal>integration-test</goal>
</goals>
</execution>
<execution>
<id>verify</id>
<phase>verify</phase>
<goals>
<goal>verify</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
<plugin>
<!-- Build an executable JAR -->
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<!--<classpathPrefix>lib/</classpathPrefix>-->
<mainClass>io.outright.myproject.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<artifactSet>
<excludes>
<exclude>junit:junit</exclude>
<!--<exclude>log4j:log4j:jar:</exclude>-->
</excludes>
</artifactSet>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>

Use getResourceAsStream instead of getResource. getResource returns the URL of file, not the file itself. Then write the InputStream to a file, and use that file.
ClassLoader classLoader = getClass().getClassLoader();
if (classLoader.getResourceAsStream(filePath) == null) {
// throw error
}
InputStream inputStream = classLoader.getResourceAsStream(filePath);
// write input stream to a file
I faced the same issue. This might help: Get directory path of maven plugin in its own Mojo

Combine java code and dependencies into one jar (executable jar) using maven

I'm trying to compile my src into one jar file with Netbeans. I currently compile via the right click Build with Dependecies. Here is my pom file
<?xml version="1.0" encoding="UTF-8"?>
<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>ca.osmcanada</groupId>
<artifactId>OSVUploadr</artifactId>
<version>0.1-ALPHA</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>com.github.scribejava</groupId>
<artifactId>scribejava-apis</artifactId>
<version>2.8.1</version>
</dependency>
<dependency>
<groupId>com.drewnoakes</groupId>
<artifactId>metadata-extractor</artifactId>
<version>2.9.1</version>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<mainClass>ca.osmcanada.osvuploadr.JFMain</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<configuration>
<archive>
<manifest>
<mainClass>ca.osmcanada.osvuploadr.JFMain</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<executions>
<execution>
<id>make-assembly</id> <!-- this is used for inheritance merges -->
<phase>package</phase> <!-- bind to the packaging phase -->
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</configuration>
</plugin>
</plugins>
</build>
</project>
When I execute the output jar file it can't find the com.github.scribejava and com.drewnoakes libraries. Also if I don't use the maven-jar-plugin the main class doesnt get added to the meta-inf/manifest.mf. What exactly am I doing wrong?

Put the execution tag outside configuration tag for maven-assembly-plugin, like below:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.6</version>
<configuration>
<archive>
<manifest>
<mainClass>ca.osmcanada.osvuploadr.JFMain</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>

Class Not Found Exception for a Maven Jar

I use maven to manage dependency in my project. This is my pom.xml
pom.xml
<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>com.prasanna</groupId>
<artifactId>fft-java</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>fft-java</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
</dependency>
<dependency>
<groupId>com.github.wendykierp</groupId>
<artifactId>JTransforms</artifactId>
<version>3.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<!-- Build an executable JAR -->
<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>com.prasanna.TestFFT</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
</project>
I have only one java class in my application. When I run my class from my application, it runs as expected. Whereas if I make a mvn package and try to run it from the terminal as java -jar test-fft.jar, I get a java.lang.ClassNotFoundException: org.jtransforms.fft.DoubleFFT_2D
But this DoubleFFT_2D is a part of JTransforms dependency that I have added. How would I run this jar?

<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<id>copy-dependencies</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>Mydir/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>
<outputDirectory>MyDir</outputDirectory>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib</classpathPrefix>
<mainClass>com.test.entryClassOfJarHavingMainMethod</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
Use these configuration in pom.xml to create jar with lib folder and package as a jar

use the maven-assembly plugin to build the jar with dependency.
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>