#425 Can't start Checkstyle in Eclipse Version: Oxygen.1a Release (4.7.1a)

[Argo L]

Hi,
I get the following message when I try to open checkstyle preferences from eclipse options. it happend after updating eclipse to the latest release. (I have cleaned eclipse and reinstalled checkstyle. checkstyle also at latest version (8.0.0))

Expection:
Unable to execute early startup code for the org.eclipse.ui.IStartup extension contributed by the 'net.sf.eclipsecs.ui' plug-in.

Stack Trace:

org.eclipse.core.runtime.CoreException: Plug-in net.sf.eclipsecs.ui was unable to load class net.sf.eclipsecs.ui.CheckstylePluginStartup.
    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 org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
    at org.eclipse.ui.internal.WorkbenchPlugin.lambda$0(WorkbenchPlugin.java:288)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:52)
    at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:285)
    at org.eclipse.ui.internal.EarlyStartupRunnable.run(EarlyStartupRunnable.java:53)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.Workbench$40.run(Workbench.java:2747)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:56)
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle net.sf.eclipsecs.ui (87).
    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:112)
    at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:529)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:328)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:368)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:446)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:395)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:387)
    at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.eclipse.osgi.internal.framework.EquinoxBundle.loadClass(EquinoxBundle.java:564)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
    ... 10 more
Caused by: org.osgi.framework.BundleException: Exception in net.sf.eclipsecs.ui.CheckstyleUIPlugin.start() of bundle net.sf.eclipsecs.ui.
    at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:800)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:729)
    at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:933)
    at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:309)
    at org.eclipse.osgi.container.Module.doStart(Module.java:581)
    at org.eclipse.osgi.container.Module.start(Module.java:449)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:468)
    at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:103)
    ... 20 more
Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/eclipse/osgi/internal/loader/EquinoxClassLoader) previously initiated loading for a different type with name "org/eclipse/swt/widgets/Display"
    at net.sf.eclipsecs.ui.CheckstyleUIPlugin.start(CheckstyleUIPlugin.java:84)
    at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:779)
    at org.eclipse.osgi.internal.framework.BundleContextImpl$3.run(BundleContextImpl.java:1)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:772)
    ... 27 more

Session Data:

eclipse.buildId=4.7.1.M20171009-0410
java.version=1.8.0_141
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=de_DE

Can you take a look?

Ty for a great plugin