I have spent several hours on this and I'm unable to get it done. For a Maven/JavaFX-Application I am trying to get an executable jar. But whenever I build it with its dependencies and execute it with java -jar Kvn-jar-with-dependencies.jar I get one of these errors:
When executing the Fat Jar:
- Error: Could not find or load main class com.qohelet.kvn.MainApp
When executing the Jar which apparently doesn't contain the dependencies
- no main manifest attribute, in Kvn.jar
I use netbeans 8.2 for development (this is one of the last versions which can run with the OpenJDK 1.8.0) and I can run my project any time using (or better, Netbeans uses it):
cd /home/qohelet/Projekte/Kvn; JAVA_HOME=/home/qohelet/jdk1.8.0_111 /home/qohelet/netbeans-8.2/java/maven/bin/mvn "-Dexec.args=-classpath %classpath com.qohelet.kvn.MainApp 'USER' 1 'Indonesia'" -Dexec.executable=/home/qohelet/jdk1.8.0_111/bin/java org.codehaus.mojo:exec-maven-plugin:1.2.1:exec
There had been an issue with the obtaining the dependencies due to the change by mvn to ssh, but I didn't even have maven installed before, it still worked. (Maven dependencies are failing with a 501 error), now one of the addresses in the project header contains a https instead of a http but I don't think this is much of an issue.
Currently the pom.xml looks like this, this is an edited version of https://maven.apache.org/plugins/maven-assembly-plugin/usage.html:
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.qohelet</groupId>
<artifactId>Kvn</artifactId>
<version>2.2</version>
<packaging>jar</packaging>
<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>
<finalName>Kvn</finalName>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>3.3.0</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<classpathPrefix>lib/</classpathPrefix>
<mainClass>com.qohelet.kvn.MainApp</mainClass>
</manifest>
</archive>
</configuration>
<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>
</plugin>
</plugins>
</build>
<dependencies>
<!-- Various -->
</dependencies>
<name>Kvn</name>
</project>
This version gives me the mentioned error.
I found a different suggestion where the -Section is set up like that which apparently worked for a while, but for some reason it doesn't seem to be advised as Netbeans complains:
Problem: Project Problem: Project's main artifact is processed through maven-shade-plugin, resolvable by: org.netbeans.modules.maven.problems.ProblemReporterImpl$MavenProblemResolver@a5534d unresolved
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.qohelet.kvn.MainApp</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
<resources>
<resource>
<filtering>true</filtering>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
A few months ago the project could still be built with the following -Section but this was mostly a result from trial and error until I had a working result:
<build>
<finalName>Kvn</finalName>
<plugins>
<!-- download source code in Eclipse, best practice -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<version>2.9</version>
<configuration>
<downloadSources>true</downloadSources>
<downloadJavadocs>false</downloadJavadocs>
</configuration>
</plugin>
<!-- Set a compiler level -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
</plugin>
<!-- Maven Shade Plugin -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.3</version>
<executions>
<!-- Run shade goal on package phase -->
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<!-- add Main-Class to manifest file -->
<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>com.qohelet.kvn.MainApp</mainClass>
</transformer>
</transformers>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
I am not sure if I interpret this correctly but can it be due to version changes in Java? SO provides a lot of answer, but I am not able to get anything to work.
https://stackoverflow.com/a/589111/2516892 gets me the exact same error:
<build>
<plugins>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.qohelet.kvn.MainApp </mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-my-jar-with-dependencies</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
Similar to https://stackoverflow.com/a/4323501/2516892 with the following build section which doesn't return a Fat Jar but the same error.
What is the state of the art? How should it be done properly?
Thank you
Edit (1):
The structure of the Jar looks fine to me. 22Mb seems to be a reasonable size too. It a folder /com/qohelet/kvn/ which contains a MainApp.class
Using https://stackoverflow.com/a/574650/2516892 and compiling with
mvn clean compile assembly:single
weirdly results in a set of errors like
package javafx.beans.value does not exist
Which is odd as JavaFX is installed and I can run the program without any issue. Netbeans is not doing much different:
cd /home/qohelet/Projekte/Kvn; JAVA_HOME=/home/qohelet/jdk1.8.0_111 /home/qohelet/netbeans-8.2/java/maven/bin/mvn clean install
But this results in a jar with only 254Kb, which I assume doesn't contain the dependencies. Including the make-assembly-part just creates the same error.
Using the 2nd one listed here https://maven.apache.org/plugins/maven-shade-plugin/examples/executable-jar.html is just the same error: Error: Could not find or load main class com.qohelet.kvn.MainApp, the archive is slightly smaller (19Mb) and again it contains a folder-structure: /com/qohelet/kvn/ which contains a MainApp.class