In production we sometimes get exceptions and we log them using 
StackTraceDeobfuscator class on the server (either symbol maps or source 
maps, depending on browser). However these stack traces are often broken 
when comparing the member with the file it should live in.

Some examples:

at Unknown.removeChild(Unknown@-1)
at 
com.google.gwt.dom.client.Node.$removeChild(com/google/common/base/Joiner.java:198)
at 
com.google.gwt.user.client.ui.SimplePanel.$remove(com/google/common/collect/super/com/google/common/collect/ImmutableList.java:41)
at 
com.google.gwt.user.client.ui.SimplePanel.remove(com/google/common/collect/super/com/google/common/collect/ImmutableMap.java:239)
at com.google.gwt.user.client.ui.SimplePanel$1.remove(SimplePanel.java:93)
at 
com.google.gwt.user.client.ui.Panel.$clear(com/google/gwt/user/client/ui/Panel.java:75)


at 
java.lang.Throwable.Throwable(com/google/gwt/emul/java/util/AbstractCollection.java:68)
at 
java.lang.RuntimeException.RuntimeException(com/google/gwt/emul/java/util/AbstractList.java:208)
at 
com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(com/google/common/collect/super/com/google/common/collect/ForwardingImmutableMap.java:108)
at 
com.google.web.bindery.event.shared.SimpleEventBus.$doFire(com/google/common/collect/super/com/google/common/collect/ImmutableList.java:281)
at 
com.google.gwt.place.shared.PlaceController.$goTo(com/google/gwt/emul/java/util/AbstractMap.java:167)


at 
com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:656)
at 
com.google.gwt.event.shared.UmbrellaException.UmbrellaException(com/google/gwt/http/client/Request.java:247)
at 
com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:638)


Any idea how this could happen and where to look at, or is this kind of 
expected with current compiler? 

-- J.

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