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Unable to launch Eclipse in Ubuntu [message #1806003]

Tue, 30 April 2019 10:36

Emil Oanta

Messages: 2
Registered: April 2015

Junior Member

Dear All,

I started working with Eclipse 16 years ago and I used it for Java and C++ software development in Windows OS.
I also used MinGW, NotePad++ and GNU Octave because they are cross-platform.
Four months ago I installed Ubuntu on my laptop, so I work in two operating systems using the aforementioned software applications. Each time I solved a problem I wrote a 'How to ...' text file in order to keep track of my activity and to have a 'recipe', just in case.
I was working on updating the C++ applications in order to be also used in Ubuntu, to develop cross-platform software. The large number of header files is useful to quickly develop computer assisted hybrid models (engineering, economics and others), i.e. dedicated solvers, scientific visualization applications and data interfaces.
Yesterday Eclipse (Ubuntu) suddenly reported that it cannot handle C++ files and asked me to select and outer editor for the source files. The error was persistent, therefore I decided to re-install Eclipse.
I removed everything and I installed Eclipse from the Ubuntu Developer Tools, as I did before.
The results was a disaster! The error is:

!SESSION Tue Apr 30 15:07:45 EEST 2019 -----------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2019-04-30 15:07:45.733
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:626)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

Several similar errors were reported, without any solution, so far:

https://stackoverflow.com/questions/54486396/error-when-starting-eclipse-from-favorites-toolbar-java-lang-classnotfoundexcept#

https://forum.ubuntu-fr.org/viewtopic.php?id=2039146

https://askubuntu.com/questions/1031171/eclipse-doesnt-start-on-ubuntu-18-04

I removed and re-install Eclipse several times using various methods but the error is the same.
I still want to use Eclipse in my projects, because I consider it is a reliable IDE. However, now I am under presser to complete a project and I don't like to search for alternatives to Eclipse.

Any idea is welcome!

Thank you,

Emil

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Re: Unable to launch Eclipse in Ubuntu [message #1806035 is a reply to message #1806003]

Wed, 01 May 2019 07:34

Ed Merks

Messages: 33137
Registered: July 2009

Senior Member

You should install the Eclipse version you get from https://www.eclipse.org/downloads/ because if you get it from somewhere else, e.g., Ubuntu Developer Tools, then I have no idea which version you have. Furthermore it sounds like it's an older version that don't work with Java 9 or higher which is a known issue with older versions of Eclipse.

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

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Re: Unable to launch Eclipse in Ubuntu [message #1806329 is a reply to message #1806035]

Tue, 07 May 2019 18:49

Patrick Moran

Messages: 141
Registered: March 2018

Senior Member

When Eclipse crashes itself or when I write software that asks the computer to do something impossible and/or harmful, it is rather astounding how far the knock-on effects can go on. I think that reinstalling Eclipse from the official site is the right way to go, but before you do that I think it would be helpful to make sure that your system is free of all old Eclipse traces. and also run whatever software is available to you to check your file system and other system attributes to assure that there are no sunken logs in those waters./

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Re: Unable to launch Eclipse in desktop icon [message #1815999 is a reply to message #1806003]

Wed, 16 October 2019 18:58

megala m

Messages: 1
Registered: October 2019

Junior Member

!SESSION Wed Oct 16 23:04:11 IST 2019 ------------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2019-10-16 23:04:11.772
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:597)
at org.eclipse.equinox.launcher.Main.run(Main.java:1468)

resolved this issue by starting my eclipse with "Run as Administor:"