Trying to create a fat jar including all the dependencies using maven-assembly plugin. Tried a bunch of things, but end up with main class not found error. Seems like I've hit a wall, been here for a few hours now.
pom.xml snippet:
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>foobar</groupId>
<artifactId>foobar</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<configuration>
<outputDirectory>/home/jars/foobar/</outputDirectory>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
<archive>
<manifest>
<mainClass>com.foobar.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>...</dependencies>
</project>
Maven commands executed:
mvn clean compile assembly:single
mvn package assembly:single
mvn clean compile package assembly:single
Creates jar in /home/jars/foobar/foobar-1.0-SNAPSHOT-jar-with-dependencies.jar as expected
MANIFEST.INF in META-INF
Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Built-By: user
Created-By: Apache Maven 3.3.9
Build-Jdk: 1.8.0_131
Main-Class: com.foobar.Main
Java commands executed:
java -jar foobar-1.0-SNAPSHOT-jar-with-dependencies.jar
java -cp foobar-1.0-SNAPSHOT-jar-with-dependencies.jar com.foobar.Main
java -jar foobar-1.0-SNAPSHOT-jar-with-dependencies.jar -cp com.foobar.Main
All return the same error: Error: Could not find or load main class com.foobar.Main
OS: Fedora 25
java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode
javac -version
javac 1.8.0_121
mvn --version
Apache Maven 3.3.9 (NON-CANONICAL_2016-07-01T11:53:38Z_mockbuild; 2016-07-01T17:23:38+05:30)
Maven home: /usr/share/maven
Java version: 1.8.0_131, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.131-1.b12.fc25.x86_64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "4.10.13-200.fc25.x86_64", arch: "amd64", family: "unix"
SOLVED:
The issue was that the source code wasn't getting compiled. Couldn't find the source code jar in the fat jar. Seems like maven assumes a certain package structure.
Adding the following to <build> solved the issue:
<sourceDirectory>src/com/foobar</sourceDirectory>
The Maven plugin does restructured the content of the JAR for Spring-boot compatible which can cause the commandline "java -jar ..." not to work properly. As user user2354302 discovered, adding src/com/foobar helped.