Eclipse doesn't start

[Kevin]

If I start eclipse it just shows an error message:

An error has occurred. See the log file
/home/myuser/.eclipse/org.eclipse.platform_3.8_155965261/configuration/1471679009506.log

The log file contains:

!SESSION Sat Aug 20 09:43:29 CEST 2016 -----------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2016-08-20 09:43:29.563
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
        at java.net.URLClassLoader.findClass(java.base@9-ea/URLClassLoader.java:388)
        at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:486)
        at java.lang.ClassLoader.loadClass(java.base@9-ea/ClassLoader.java:419)
        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)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: eclipse 3.8.1-8
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Uname: Linux 4.4.0-34-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sat Aug 20 09:41:39 2016
InstallationDate: Installed on 2016-05-18 (93 days ago)
InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420)
PackageArchitecture: all
SourcePackage: eclipse
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.eclipse.ini: [modified]
mtime.conffile..etc.eclipse.ini: 2016-08-20T01:16:42.572837