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Class not found exception in packaged plug-in. Xtext file .ui generate [message #1076896]

Thu, 01 August 2013 01:42

Mayerli Romero

Messages: 3
Registered: July 2013

Junior Member

Hello

I'm package a plugin made for me called mView. I create my plug in using xtext and it generate 2 files more than my original project (mView.test and mView.ui) I have a problem with deploying of my packaged plug-in (i.e., when it is not started in a runtime workbench).

The error is:

Plug-in mView.ui was unable to load class org.xtext.example.mydsl.ui.MViewExecutableExtensionFactory.

org.eclipse.core.runtime.CoreException: Plug-in mView.ui was unable to load class org.xtext.example.mydsl.ui.MViewExecutableExtensionFactory. at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194) at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:176) at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905) at ..... Caused by: java.lang.ClassNotFoundException: org.xtext.example.mydsl.ui.MViewExecutableExtensionFactory at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412) ....

I already ensure of the jdk and jre compatibility and all its ok. In the part of the MANIFIEST of the plug-in I already check the jar file that contains the plug-in classes and be listed in the Bundle-ClassPath. In the dependency's of the plug-in appears xtext and in the file built.properties is check the source folder in SourceBuild and BinaryBuild, but I can't find it more to do, I would greatly appreciate your help.

sorry for my English. Thank You!

PD: just for information. I package my plug-in following this turorial: http: //www.vogella.com/ articles/ EclipsePlugIn/ article.html#p2deployplugin_overview

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1076922 is a reply to message #1076896]

Thu, 01 August 2013 02:40

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

Hi can you please share your code

--
Need training, onsite consulting or any other kind of help for Xtext?
Go visit http://xtext.itemis.com or send a mail to xtext at itemis dot de

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1077387 is a reply to message #1076922]

Thu, 01 August 2013 16:16

Mayerli Romero

Messages: 3
Registered: July 2013

Junior Member

I already fix it. The proyects that xtext generate mView.test and mView.ui dont have the built.properties file. I copy this file of the principal proyect, paste and modify in each project. And it works!... Thank You Smile

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1766746 is a reply to message #1076922]

Mon, 26 June 2017 17:09

Christian Schulze

Messages: 8
Registered: October 2011

Junior Member

Hi Christian,

I got the same issue within my project (on branch master):
https://github.com/marc-christian-schulze/structs4java

Could you please have a look at the sources?

I already checked the build.properties files but they seem to be ok.

Best regards
Christian

[Updated on: Mon, 26 June 2017 17:11]

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1766747 is a reply to message #1766746]

Mon, 26 June 2017 17:25

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

for me it looks like the complete maven config is broken (config of source folders etc ...)
this might be caused by not checking in .classpath /.project files

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1766748 is a reply to message #1766747]

Mon, 26 June 2017 18:08

Christian Dietrich

Messages: 14665
Registered: July 2009

Senior Member

i just built with pure maven and not importing anything into eclipse and it worked fine after installing into a eclipse.

Twitter : @chrdietrich
Blog : https://www.dietrich-it.de

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Re: Class not found exception in packaged plug-in. Xtext file .ui generate [message #1766924 is a reply to message #1766748]

Wed, 28 June 2017 18:24

Christian Schulze

Messages: 8
Registered: October 2011

Junior Member

Seems I found my mistakes:

1. Eclipse Configuration not generated by m2e-Connector:
My assumption was that the m2e plugin has a connector to configure Eclipse properly for the xtext plugin but it didn't.
But copying the example configuration from your github project resolved almost all error markers:
https://github.com/xtext/maven-xtext-example

2. Forgot to install the MWE 2 language SDK:
After copying the Eclipse configuration only the following error message was left:
"Bundle org.eclipse.emf.mwe2.launch cannot be resolved"
After some web crawling I read in the following article that I missed to install the "MWE 2 language SDK" plugin:
https://www.eclipse.org/forums/index.php/t/164527/

But after that Eclipse gladly runs my plugin in the debugger. :)

Best regards
Christian

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