SerializableThrowable does not handle suppressed exceptions

[jnehlmeier]

GWT version: head

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Description

GWT supports suppressed exceptions and also uses them internally in UmbrellaException. Sending exceptions containing suppressed exceptions to the server for remote logging using SerializableThrowable + GWT-RPC + StackTraceDeobfuscator will omit these exceptions, effectively loosing valuable information.

Steps to reproduce

var cause1 = new RuntimeException("cause 1");
cause1.addSuppressed(new RuntimeException("suppressed 1"));

var cause2 = new RuntimeException("cause 2");
cause2.addSuppressed(new RuntimeException("suppressed 2"));

var cause3 = new RuntimeException("cause 3");
cause3.addSuppressed(new RuntimeException("suppressed 3"));

var causes = new HashSet<Throwable>();
causes.add(cause1);
causes.add(cause2);
causes.add(cause3);

var umbrella = new UmbrellaException(causes);
umbrella.addSuppressed(new RuntimeException("suppressed 4"));

throw umbrella;

The above will loose cause2 and cause3 chain as well as suppressed 1 and suppressed 4.

Known workarounds

Build your own serializable throwable wrapper class.