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I am trying to use Maven for managing the dependencies of my plug-in project. The dependencies are correctly stated in the POM.xml. Even though, I get the exception :

java.lang.NoClassDefFoundError

Is it the correct way for solving dependencies for an Eclipse plug-in project?

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  • Which class is stated? Can you post significative stack trace and pom.xml? Meanwhile, take a look at this Why am I getting a NoClassDefFoundError in Java? Commented May 27, 2020 at 18:26
  • I am using Swagger-Parser, when I run my code from a main as a Java Application, it runs fine. But when I run it as a plug-in it doesn't. The class which is not found is java.lang.NoClassDefFoundError: io/swagger/v3/parser/OpenAPIV3Parser Commented May 27, 2020 at 18:45
  • Can you post how do you run it as a plugin, maven goal? Commented May 27, 2020 at 18:56

1 Answer 1

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Eclipse plug-ins must use the Require-Bundle or Import-Package statements in the plug-in's MANIFEST.MF to specify their dependencies.

Plug-ins can only be dependent on other plug-ins.

If you want to use a jar which is not a plug-in it must be included in the plug-in and included in the Bundle-Classpath in the MANIFEST.MF. You will also have to update the build.properties file to include the jars in the plug-in build.

Example MANIFEST.MF extract that includes 3 jars in the plug-in:

Require-Bundle: greg.music.core;bundle-version="1.0.0", greg.music.resources;bundle-version="1.0.0", org.eclipse.core.runtime, javazoom.jlgui.basicplayer, org.eclipse.e4.core.services;bundle-version="2.0.100" Bundle-ClassPath: ., lib/jogg-0.0.7.jar, lib/jorbis-0.0.15.jar, lib/vorbisspi1.0.2.jar Import-Package: javax.annotation;version="1.0.0", javax.inject;version="1.0.0", org.eclipse.e4.core.di.annotations

Matching build.properties

source.. = src/ output.. = bin/ bin.includes = META-INF/,\ .,\ plugin.properties,\ plugin.xml,\ lib/jogg-0.0.7.jar,\ lib/jorbis-0.0.15.jar,\ lib/vorbisspi1.0.2.jar
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4 Comments

There is no way to use maven then ?
I added the jars to the Bundle-Classpath. The Plug-in has no problems. Even though I still have the 'java.lang.NoClassDefFoundError'.
You can use Maven to do plug-in builds by using Eclipse Tycho. See for example this tutorial
You must make sure the jars are included in the built plugin - make sure the build.properties includes the jars.

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