Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: sun.nio.cs.UTF_8 cannot be cast to java.lang.String
    at net.sf.jabref.gui.preftabs.GeneralTab.storeSettings(GeneralTab.java:245)
    at net.sf.jabref.gui.preftabs.PreferencesDialog$OkAction$1.run(PreferencesDialog.java:266)
    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:497)
    at spin.Invocation.evaluate(Invocation.java:175)
    at spin.off.SpinOffEvaluator$1.run(SpinOffEvaluator.java:108)
    at java.lang.Thread.run(Thread.java:745)
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: sun.nio.cs.UTF_8 cannot be cast to java.lang.String
    at net.sf.jabref.gui.preftabs.GeneralTab.storeSettings(GeneralTab.java:245)
    at net.sf.jabref.gui.preftabs.PreferencesDialog$OkAction$1.run(PreferencesDialog.java:266)
    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:497)
    at spin.Invocation.evaluate(Invocation.java:175)
    at spin.off.SpinOffEvaluator$1.run(SpinOffEvaluator.java:108)
    at java.lang.Thread.run(Thread.java:745)