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    via Stack Overflow by ERJAN

    This exception occurs when using an older version of java. Mainly when trying to run a jar compiled with a newer Java version in an older Java version. We can avoid this issue by executing the jar in the same version which it was compiled.

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java.lang.UnsupportedClassVersionError: ru/runa/jbpm/ui/UiPlugin (Unsupported major.minor version 49.0)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(Unknown Source)	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.defineClass(DefaultClassLoader.java:370)	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.defineClass(EclipseClassLoader.java:233)	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.findClassImpl(DefaultClassLoader.java:343)	at org.eclipse.osgi.framework.adaptor.core.DefaultClassLoader.findClass(DefaultClassLoader.java:235)	at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.findLocalClass(AbstractClassLoader.java:183)	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.basicFindLocalClass(EclipseClassLoader.java:141)	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java:82)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:337)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:389)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:350)	at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.loadClass(AbstractClassLoader.java:78)	at java.lang.ClassLoader.loadClass(Unknown Source)	at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:275)	at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadBundleActivator(AbstractBundle.java:142)	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:965)	at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:313)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:264)	at org.eclipse.core.runtime.adaptor.EclipseClassLoader.findLocalClass(EclipseClassLoader.java:116)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findLocalClass(BundleLoader.java:337)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:389)	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:350)	at org.eclipse.osgi.framework.adaptor.core.AbstractClassLoader.loadClass(AbstractClassLoader.java:78)	at java.lang.ClassLoader.loadClass(Unknown Source)	at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:275)	at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1248)	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:152)	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:142)	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:129)	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:48)	at org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:222)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)	at org.eclipse.core.launcher.Main.basicRun(Main.java:278)	at org.eclipse.core.launcher.Main.run(Main.java:973)	at org.eclipse.core.launcher.Main.main(Main.java:948)