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eclipse ubuntu 18.04 installation java.lang.ClassNotFoundException:

Installed eclipse and Java8. But it isn't working.
When try to run it following error occur.
An error has occurred. See the log file
/home/shield/.eclipse/org.eclipse.platform_3.8_155965261/configuration/1526718159168.log
I checked the log file and found these lines:
** !ENTRY org.eclipse.equinox.launcher 4 0 2018-05-19 13:40:07.262
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException:
org.eclipse.core.runtime.adaptor.EclipseStarter
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
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)**

Just went through same issue with Ubuntu 18.04. Don't know specific answer but reinstalling directly from eclipse.org (C/C++ installer) eclipse-cpp-oxygen-3a-linux-gtk-x86_64.tar.gz went well. No more issues.
Installing at Ubuntu 16.04, no issues found with synaptic installation either.
So, just use eclipse installer in newest Ubuntu.

JavaFX: Weird ClassNotFoundException after updating to Java 9

I started a Maven project in Java 8 and wanted to migrate it to Java 9. At the same time I also went from Eclipse Neon EE to Eclipse Oxygen EE. (JFX SDK reinstalled).
While the Eclipse Workspace shows no errors; as soon as I try to compile and run the exact same program that used to run perfectly fine in Java 8, I get the following Exception:
{...}
Caused by: java.lang.ClassNotFoundException: com.sun.javafx.css.converters.PaintConverter
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
... 26 more
Exception running application application.Main
I have now rebuilt the project several times and cannot get it to work...

In Java 9, the previous internal class
com.sun.javafx.css.converters.PaintConverter
became public as
javafx.css.converter.PaintConverter in the module javafx.graphics.
See Javadoc - Class PaintConverter.
JFoenix supports Java 9 with a separate JAR.

jenkins executor not building MasterToSlaveCallable

Trying to build a project in Jenkins
Some misconfiguration or something that has been broken , and cannot understand what.
The builds get executed but no command is printed on the Console Output.
It has to do with the executors. The jenkins log is:
java.lang.NoClassDefFoundError: jenkins/security/MasterToSlaveCallable
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
at jenkins.util.AntClassLoader.defineClassFromData(AntClassLoader.java:1138)
at hudson.ClassicPluginStrategy$AntClassLoader2.defineClassFromData(ClassicPluginStrategy.java:756)
at jenkins.util.AntClassLoader.getClassFromStream(AntClassLoader.java:1309)
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1365)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:531)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)
Caused by: java.lang.ClassNotFoundException: jenkins.security.MasterToSlaveCallable
at jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1375)
at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
Thank you

A NoClassDefFoundError indicates a likely incompatibility between a Jenkins plugin and either another plugin or Jenkins core. I would double-check the versions of core and your plugins on the Jenkins management page to make sure you're not running any incompatible versions.

Unable to start server due following issues: Launch process failed with exit code 1

For 3 days now, I have been trying to install glassfish 4.1 on eclipse Luna version 4.4.1. I first installed the plugin from eclipse marketplace then added it in my runtime using jdk 8. I also made jdk my default since eclipse default uses jre. I have to point out that I have been been using glassfish on netbeans and tomcat on eclipse but I decided to play around with glassfish on eclipse. Every information I got on the internet didn't fix my issue.
Below is the error I got in the console. Right now, this is driving me nuts so I have decided to come to you for direction.
Thanks
Launching GlassFish on Felix platform
ERROR: Unable to create cache directory: C:\Program Files\glassfish-4.1\glassfish\domains\domain1\osgi-cache\felix
ERROR: Error creating bundle cache. (java.lang.RuntimeException: Unable to create cache directory.)
java.lang.RuntimeException: Unable to create cache directory.
at org.apache.felix.framework.cache.BundleCache.<init>(BundleCache.java:131)
at org.apache.felix.framework.Felix.init(Felix.java:640)
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiFrameworkLauncher$1.run(OSGiFrameworkLauncher.java:88)
Exception in thread "Thread-1" java.lang.RuntimeException: org.osgi.framework.BundleException: Error creating bundle cache.
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiFrameworkLauncher$1.run(OSGiFrameworkLauncher.java:90)
Caused by: org.osgi.framework.BundleException: Error creating bundle cache.
at org.apache.felix.framework.Felix.init(Felix.java:645)
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiFrameworkLauncher$1.run(OSGiFrameworkLauncher.java:88)
Caused by: java.lang.RuntimeException: Unable to create cache directory.
at org.apache.felix.framework.cache.BundleCache.<init>(BundleCache.java:131)
at org.apache.felix.framework.Felix.init(Felix.java:640)
... 1 more
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at com.sun.enterprise.glassfish.bootstrap.GlassFishMain.main(GlassFishMain.java:97)
at com.sun.enterprise.glassfish.bootstrap.ASMain.main(ASMain.java:54)
Caused by: org.glassfish.embeddable.GlassFishException: java.lang.NullPointerException
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiGlassFishRuntimeBuilder.build(OSGiGlassFishRuntimeBuilder.java:170)
at org.glassfish.embeddable.GlassFishRuntime._bootstrap(GlassFishRuntime.java:157)
at org.glassfish.embeddable.GlassFishRuntime.bootstrap(GlassFishRuntime.java:110)
at com.sun.enterprise.glassfish.bootstrap.GlassFishMain$Launcher.launch(GlassFishMain.java:112)
... 6 more
Caused by: java.lang.NullPointerException
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiGlassFishRuntimeBuilder.newFramework(OSGiGlassFishRuntimeBuilder.java:241)
at com.sun.enterprise.glassfish.bootstrap.osgi.OSGiGlassFishRuntimeBuilder.build(OSGiGlassFishRuntimeBuilder.java:135)
... 9 more
Error stopping framework: java.lang.NullPointerException
java.lang.NullPointerException
at com.sun.enterprise.glassfish.bootstrap.GlassFishMain$Launcher$1.run(GlassFishMain.java:203)
Java HotSpot(TM) Client VM warning: ignoring option MaxPermSize=192m; support was removed in 8.0

Run Eclipse or any other IDE you use in Administrator mode.
Works for me.

I think your comment deserves to be posted as the main answer but I have been trying to mark your comment as answer but I wash't able to. So I decided to post post your comment here and then back it up with my own experience.
Answer by unwichtich:
I guess this is a similar problem. The cause may be that you have installed Glassfish in c:\Program Files. You can try to move your Glassfish installation to a directory where your normal user account has full access rights but you then have to change the path to the Glassfish installation in Eclipse.
My own experience:
Turns out that all the problems I had with the glassfish server (including exit code 1 error) was because glassfish could not handle folder names with spaces in it. So I moved the glassfish-4.1 folder from C:\Program File\glassfish-4.1.. path to C:\ glassfish-4.1.. It wiped all my tears away. This is really important in eclipse and netbeans IDEs (if you are installing the netbeans that does not come with a glassfish bundled zip).

I had the same problem and fixed it by installing Glassfish under C:\ instead of C:\Program Files. Try that.

use JDk 7 instead of JDK 8 am also faced the same issue i just changed to jdk7 its working now.

ClassNotFoundException of NIO using Tomcat 7 and Java 7

I build a web project in Eclipse Kepler with Apache Tomcat 7.0.47.
While running on server, it causes java.lang.ClassNotFoundException: java.nio.file.Paths as below.
java.lang.NoClassDefFoundError: java/nio/file/Paths
at ...
Caused by: java.lang.ClassNotFoundException: java.nio.file.Paths
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
... 12 more
It worked well before I invite this new feature of Java 7. Could anyone give me some suggest to figure out what's going on here please?

Uninstalling older version is not required.
But it is obvious that your Tomcat 7.0 still uses the jdk 6. There are two paths system path and user path. Check both of them.