Personal Beauty, I'm having an error that has now appeared in the eclipse luna, does anyone know what it might be, some plugin to upgrade? The persistence.xml file does not open and the error in the title
Plug-in org.eclipse.jpt.jpa.ui was unable to load class org.eclipse.jpt.jpa.ui.internal.editors.JpaXmlEditor.
org.eclipse.core.runtime.CoreException: Plug-in org.eclipse.jpt.jpa.ui was unable to load
class org.eclipse.jpt.jpa.ui.internal.editors.JpaXmlEditor.
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194)
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$1.run(WorkbenchPlugin.java:294)
Caused by: java.lang.ClassNotFoundException: An error occurred while automatically activating bundle org.eclipse.jpt.jpa.ui (414).
at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:116)
at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:531)
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.jpt.jpa.ui.internal.plugin.JptJpaUiPlugin.start() of bundle org.eclipse.jpt.jpa.ui.
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:792)
at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:721)
at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:936)
Caused by: java.lang.NullPointerException
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.clearJpaProjects_(InternalJpaProjectManager.java:356)
at org.eclipse.jpt.jpa.core.internal.InternalJpaProjectManager.clearJpaProjects(InternalJpaProjectManager.java:345)
at org.eclipse.osgi.internal.framework.BundleContextImpl.startActivator(BundleContextImpl.java:764)
... 150 more