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NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1792973]

Thu, 26 July 2018 16:37

David Struck

Messages: 29
Registered: July 2010

Junior Member

I am trying to use ChangeRecorder in my Java application. My Eclipse project uses Maven, so that is how I am downloading the org.eclipse.emf.ecore.change jar. My code compiles nicely but I get a NoClassDefFoundError when I run my application out of Eclipse:

java.lang.NoClassDefFoundError: org/eclipse/emf/ecore/change/util/ChangeRecorder
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

Caused by: java.lang.ClassNotFoundException: org.eclipse.emf.ecore.change.util.ChangeRecorder
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

I've confirmed the org.eclipse.emf.ecore.change jar is on my launch configuration's classpath.

I've tried multiple different versions in my pom.xml, e.g.

<dependency>
<groupId>org.eclipse.birt.runtime</groupId>
<artifactId>org.eclipse.emf.ecore.change</artifactId>
<version>2.10.0.v20150123-0348</version>
</dependency>

I've also tried versions 2.11.0.v20160420-0247, 2.11.0.v20150512-0501, as well as this:

<dependency>
<groupId>org.eclipse.emf</groupId>
<artifactId>org.eclipse.emf.ecore.change</artifactId>
<version>2.11.0</version>
</dependency>

All give me the same error.

I downloaded EMF-Updates-2.12.zip from http://download.eclipse.org/modeling/emf/emf/builds/release/2.12/index.html -- the jar I extracted from there is the only jar I've found so far that works for me. But I'd prefer to manage my dependencies using Maven.

Does anyone know why the Maven jars are not working?

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1792974 is a reply to message #1792973]

Thu, 26 July 2018 17:58

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

We recently published Maven versions for EMF 2.14, so perhaps try those.

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1792976 is a reply to message #1792974]

Thu, 26 July 2018 19:09

David Struck

Messages: 29
Registered: July 2010

Junior Member

Thanks, Ed. I'm still new to Maven so it's not always obvious to me where to locate the dependency details. When I go to

https://mvnrepository.com/artifact/org.eclipse.emf/org.eclipse.emf.ecore.change

I only see one version (2.11.0). When I go to

https://mvnrepository.com/artifact/org.eclipse.birt.runtime/org.eclipse.emf.ecore.change

I see more versions but the latest is still a variant of 2.11.

Am I looking in the wrong place?

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1792985 is a reply to message #1792976]

Fri, 27 July 2018 04:36

Ed Merks

Messages: 33140
Registered: July 2009

Senior Member

Actually Karsten Thoms did the publishing work. I can see from the build script that they ended up in https://oss.sonatype.org/#nexus-search;quick~org.eclipse.emf.ecore but I think this is only a staging location and I'm not sure the final location. I'll have to ask him. Perhaps we can document such details in the build job: https://ci.eclipse.org/emf/job/publish-maven/

Ed Merks
Professional Support: https://www.macromodeling.com/

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1792992 is a reply to message #1792985]

Fri, 27 July 2018 07:42

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

My recollection is that there is/was a versioning/lifetime incompatibility between Eclipse and Maven that was 'solved' by encouraging Eclipse projects to publish via repo.eclipse.org.

A quick browse of repo.eclipse.org shows that it has a very recent org.eclipse.xtext, but only 2.12 of EMF. Generally what you find on maven-central can be very old and misleading, often contributed without knowledge of the developers.

Again my recollection is that many relengs await a generic/automated solution to publishing to avoid regular manual activities.

Almost all Eclipse projects now build with Tycho that is an extended Maven with support for Eclipse P2 repositories. I recommend that you use the P2 repos that each project publishes for use by numerous other projects. These are heavily exercised. Unfortunately what is on Maven-Central is just a teaser to deceive newbies.

Regards

Ed Willink

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1793012 is a reply to message #1792992]

Fri, 27 July 2018 13:18

David Struck

Messages: 29
Registered: July 2010

Junior Member

Thanks, guys! I was getting the impression that mvnrepository.com felt somewhat "unauthorized". I'll check out these other possibilities.

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Re: NoClassDefFoundError - org.eclipse.emf.ecore.change jar - Maven - Eclipse [message #1793824 is a reply to message #1793012]

Thu, 16 August 2018 12:48

Karsten Thoms

Messages: 762
Registered: July 2009
Location: Dortmund, Germany

Senior Member

Sorry for getting back so late, I was on vacation :)

Before my vacation I was working on the publishing on EMF artifacts. They are only in a staging repository yet, because I did not gather enough feedback if these artifacts are now as expected. When I have that feedback they could be published.

Could you please try https://oss.sonatype.org/content/repositories/orgeclipseemf-1057 ?

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