Daniel John Debrunner wrote:
David W. Van Couvering wrote:
Hi, Kathey and Dan. During our discussions on shared code, you had both
felt some helpful diagnostic information around mixed versions of Derby
would be important.
I want to make sure I understand these, so I have quoted them below with
questions. Once I understand them better I can log JIRA items on them.
I also would like to know whether these need to be part of the initial
submission of shared code or whether they can be subsequent incremental
improvements.
Incremental developement is always good, there is no requirement for any
contribution to completely solve a problem. If a contribution makes any
progress towards some goal then that's great.
OK. I was worried that any contribution of shared code without this
would be considered "broken."
1) Kathey's suggestion, with Dan's +1: "Print warnings to the log file
when jars are mixed"
I am assuming this is done at system bootup time? What about when the
network client driver is first loaded, should I do it then too, for
environments where there say multiple network client apps running in the
same VM?
2) Kathey's suggestion, with Dan's +1: "Provide a way to print sysinfo
to the log when classes have been loaded with classloaders"
I have to say I don't fully understand this one, can you explain?
The issue is that currently sysinfo just works against the classpath,
however its classpath based output may be totally unrelated to the
environment running Derby, e.g. in an app server environment. This is an
enhancement to provide some mechanism to dump info similar to the
current sysinfo output from a running derby system.
OK. It sounds like this is related to Bryan's bug, DERBY-668, where if
a jar is loaded by the system classloader we don't report the location
correctly.
3) Dan's suggestion, in response to (2) above: "some stored procedure
version of sysinfo would be good, maybe even one that doesn't require a
database, e.g. a sysinfo ping to the network server"
It sounds like you want the network client to get the sysinfo for the
server, say at startup? How is this related to (2) above?
It's a possible (vague) mechanism for 2).
Hm, I don't see how this solves things if the network server is not
gettings its classes from the classpath...
David
Dan.
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