Faça o download do Eclipse mais recente para corrigir o problema.
No meu caso, baixei o Eclipse Neon 2.
Depois disso, o eclipse começa bem novamente.
Hoje eu tentei iniciar o Eclipse no Ubuntu 16.04 e obter o seguinte erro:
/opt/eclipse-neon-manual/eclipse
java.lang.ExceptionInInitializerError
at org.eclipse.osgi.storage.Storage.<init>(Storage.java:100)
at org.eclipse.osgi.storage.Storage.createStorage(Storage.java:87)
at org.eclipse.osgi.internal.framework.EquinoxContainer.<init>(EquinoxContainer.java:66)
at org.eclipse.osgi.launch.Equinox.<init>(Equinox.java:31)
at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:303)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:239)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:538)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:673)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:610)
at org.eclipse.equinox.launcher.Main.run(Main.java:1519)
at org.eclipse.equinox.launcher.Main.main(Main.java:1492)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected void java.net.URLClassLoader.addURL(java.net.URL) accessible: module java.base does not "opens java.net" to unnamed module @67e2d983
at java.base/jdk.internal.reflect.Reflection.throwInaccessibleObjectException(Reflection.java:427)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:201)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:192)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:186)
at org.eclipse.osgi.storage.FrameworkExtensionInstaller.findMethod(FrameworkExtensionInstaller.java:51)
at org.eclipse.osgi.storage.FrameworkExtensionInstaller.findMethod(FrameworkExtensionInstaller.java:58)
at org.eclipse.osgi.storage.FrameworkExtensionInstaller.findAddURLMethod(FrameworkExtensionInstaller.java:42)
at org.eclipse.osgi.storage.FrameworkExtensionInstaller.<clinit>(FrameworkExtensionInstaller.java:36)
... 14 more
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
Como consertar isso?
Faça o download do Eclipse mais recente para corrigir o problema.
No meu caso, baixei o Eclipse Neon 2.
Depois disso, o eclipse começa bem novamente.