NoClassDefFoundError when running JPOS Q2? - maven

Question

Trying to setup JPOS Q2 for the first time through Maven / Intellij, and coming across an error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/osgi/framework/BundleException
at Q2_Main.main(Q2_Main.java:6)
Caused by: java.lang.ClassNotFoundException: org.osgi.framework.BundleException
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 1 more
Process finished with exit code 1
I downloaded JPOS through maven, and I've tried looking at dozens of threads on the error but cannot resolve it on my own
<?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>org.example</groupId>
<artifactId>Q2_JPOS_TEST</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.jpos</groupId>
<artifactId>jpos</artifactId>
<version>2.1.6</version>
</dependency>
</dependencies>
</project>
and I see it in my external libraries
jpos in external library
import org.jpos.q2.Q2;
public class Q2_Main {
public static void main(String[] args){
Q2 q2 = new Q2("src/main/java/deploy");
q2.start();
}
}
Edit for steps that I did:
File -> New Project -> Maven Project (created the POM automatically)
Pasted the JPOS dependency from my main project into new POM file
Maven Clean + Install from within Intellij Maven Panel
Created Q2_Main.java
Hit green play button, which results in that error
Edit 2:
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< org.example:Q2_JPOS_TEST >------------
[INFO] Building Q2_JPOS_TEST 1.0-SNAPSHOT
[INFO] --------------------------------[ jar ]-----------------------
[INFO]
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) #
Q2_JPOS_TEST ---
[INFO] org.example:Q2_JPOS_TEST:jar:1.0-SNAPSHOT
[INFO] \- org.jpos:jpos:jar:2.1.6:compile
[INFO] +- commons-cli:commons-cli:jar:1.4:compile
[INFO] +- org.apache-extras.beanshell:bsh:jar:2.0b6:compile
[INFO] +- org.bouncycastle:bcprov-jdk15on:jar:1.67:compile
[INFO] +- org.bouncycastle:bcpg-jdk15on:jar:1.67:compile
[INFO] +- org.hdrhistogram:HdrHistogram:jar:2.1.12:compile
[INFO] +- org.javatuples:javatuples:jar:1.2:compile
[INFO] +- org.jdom:jdom2:jar:2.0.6:compile
[INFO] +- org.jline:jline:jar:3.19.0:compile
[INFO] \- org.slf4j:slf4j-api:jar:1.7.30:compile
[INFO] --------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] --------------------------------------------------------------
[INFO] Total time: 2.205 s
[INFO] Finished at: 2023-02-17T15:43:38-07:00
[INFO] --------------------------------------------------------------

Answer 1

I checked on the maven repository the library you are trying to use, jpos 2.1.6 (https://mvnrepository.com/artifact/org.jpos/jpos/2.1.6), and I've seen it has a series of runtime dependencies. It seems you miss org.osgi.core 6.0.0 judging from the stacktrace you posted. Make sure you have all the runtime dependencies needed in your classpath.

Answer 2

Here is a step by step of what I did to tun your code:
Create an empty folder /tmp/test-jpos
Write the file pom.xml there with the content you shared.
In IntelliJ menu File -> Open and opened the /tmp/test-jpos folder
Create dir src/main/java
Create file Q2_Main.java in that directory with content you shared.
Run the project by hitting the play run button (the green triangle)
With those steps it ran OK.
However that is not the recommended way to run Q2 I will expand on this later.