[Spread-users] [PATCH][Java bindings] Significantly improve exception handling

[Daniel L. Rall]

It's annoying to have the root cause of a SpreadException discarded.  JDK 1.4 
provides an additional constructor and set of methods on java.lang.Throwable 
to make dealing with the preservation of an exception's root cause much 
easyier  As not everyone has JDK 1.4 availble, mimic the basics of that 
behavior in SpreadException.


Provide human-friendly error messages, and preserve all root
cause exceptions using new JDK 1.4-friendly exception handling.

* javalib/SpreadConnection.java
* javalib/SpreadGroup.java
* javalib/SpreadMessage.java
   Provide more human-friendly error messages, and preserved all root
   cause exceptions using new methods from SpreadException.

* javalib/SpreadException.java
   cause: New field to store root cause of this SpreadException.

   SpreadException(String, Throwable): New ctor which sets "cause".

   getMessage(): Include the message from "cause" as part of our
   message.

   printStackTrace(PrintStream), printStackTrace(PrintWriter): Include
   the stack trace from "cause".
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