#210 Throwable caught in SignalHook.java

[Dan M.]

SignalHook.java catches and ignores Throwables in
1.16.5. As Hani best put it in www.jroller.com/page/
fate/?anchor=why_i_hate_tomcat

"Yes, even Error type exceptions are caught. Things
that God and Sun never intended for applications to
even try to handle, tomcat will (silently) catch and
ignore. After all, when you run out of memory, best
thing to do is keep going right?"

[Scott G. Miller]

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This is necessary unfortunately, because there are all kinds
of unrecoverable errors and exceptions which can be thrown
while calling into arbitrary Scheme code while handling the
exception. The signal itself is handled in a separate
thread which terminates immediately after the hook is
called, so there is no real danger, as the thread won't
continue after that anyway.

[Dan M.]

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Are you sure? Throwable's have two derived classes --
Exception and Error. Catching Exception is fine. Catching
Error usually makes no sense. Error's are things like: out
of memory, ThreadDeath, and other fun things. Have a look at

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Error.html

[Scott G. Miller]

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I can't find the reason we used throwable there, so I'll change it to Exception until something breaks. Leaving this bug open to track.