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Double-booting system behavior
Derby prevents
two instances of itself from booting the same database by using a file called
db.lck inside the database directory.
If a second instance of
Derby attempts to boot an
already running database, the following error messages appear:
ERROR XJ040: Failed to start database 'firstdb', see the next exception
for details.
ERROR XSDB6: Another instance of Derby may have already booted the
database /home/myself/DERBYTUTOR/firstdb.
In addition, a stack trace appears in the derby.log file.
If you need to access a single database from more than one
Java Virtual Machine (JVM), you will need to put a server solution in place. You
can allow applications from multiple JVMs that need to access that database to
connect to the server. The
Derby Network Server is
provided as a server solution. For basic information on starting and using the
Network Server, see Getting Started with Derby. See the
Derby Server and Administration Guide for more information on the
Network Server.
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