Tag Archives: Eclipse

Eclipse Maven Plugin – Could not handle artifact type Jar Module

When using Eclipse with the integrated Maven Plugin, I am for some time now around with the slightly annoying error message:

Eclipse Maven - Could not handle artifact type [JarModule]

This message appears whenever I update my maven project  in eclipse with the command ‘Maven->Update Project’.

I figured out now, that the reason for this message is a JarModule configuration in the pom.xml file of my EAR project. The Eclipse Maven plugin is simply unable to handle such pom files.

The solution seems to be quite simple: Open the workspace preferences dialog and just disable the option “Maven -> Java EE Integration -> Enable Java EE configuration”.


It is also possible to disable this option not for the complete workspace but for the affected EAR project. In this case you can enable the Project Specific Settings, and disable the ‘Java EE configuration’.


So you can use the Maven Java EE Integration still for other modules (e.g. Web, JPA). I have tested this with the new Eclipse Neon release.

Eclipse Mars hangs on XML Validation

Eclipse Mars is a great IDE which a lot of performance improvements against older versions of Eclipse. But I still have in some workspaces the problem that my Eclipse IDE hangs during validation of XML files of my Web Projects (e.g. web.xml or faces-config.xml). This problem is well known for the Eclipse IDE. To solve this problem in Eclipse Mars it is sufficient to disable the Validation of  “XML Schema Files”.


and also disable the Option “Honour all XML schema location” for the XML Files validation.


If you disable this options, Eclipse will be faster after updating xml files.

Eclipse Mars on Debian Jessie with Gnome 3

After downloading the new Eclipse IDE Mars I was disappointed of the corrupted design. Several dialog pages did not work as expected or were empty until the dialog window was resized.


As Eclipse release 4.5 (Mars)  is based on GTK 3, the problem in my case was the missing library “gtk3-engines-oxygen”. This it the so called Oxygen widget theme for GTK3-based applications like the Eclipse Mars release.

After installing the missing library with apt:

apt-get install gtk3-engines-oxygen

the Eclipse Mars Release works perfect!


Customize Eclipse them Jeeeyul’s Eclipse Themes

A very nice plug-in for Eclipse is the ‘Jeeeyul’s Eclipse Themes‘.  This plug-in provides a set of cool themes for eclipse and also a cool editor to customize the theme individually.

Adjusting the window margins

Another annoying thing in Eclipse GTK with Gnome is the small margin between to windows so you cant grasp the space with the mouse to resize the view.This problem can also be solved directly with the Jeeeyul’s plug-in:

In the ‘General’ section of the Jeeeyul’s Themes section you can change the “Winddow Pacing”. Disable the option ‘Cast Shadow’ and set ‘Part Stack Spacing’ to 5 and ‘Margins’ to 0. After that you need to restart Eclipse.

Alternative: Disable GTK3

An alternative is to simply deactivate GTK3 for Eclipse Mars. You need to set the environment variable ‘SWT_GTK3’ to ‘0’.

I am using the following bash start script to launch Eclipse Mars:

cd /opt/eclipse-jee-mars/
export SWT_GTK3=0

See also the comments below.


Eclipse crashes in Debian Jessie

After some updates in my Debian/Jessie installation I run into a strange problem with Eclipse. When I start Eclipse first everything looks fine, but in the moment I use some type-ahead features or browsing classes or methods in a java-file Eclipse crashes without any error message. Maybe the problem is related to an update in libwebkitgtk-3.0.

After some searching I was finally able to fix the problem by adding the following line to my eclipse.ini:


See also this bug report: