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Using Derby with IDEs
When you use an integrated development environment (IDE) to develop
an embedded Derby application,
you might need to run Derby within
a server framework.
This is because an IDE might try connecting to the database from two different
JVMs, whereas only a single JVM instance should connect to a Derby database
at one time (multiple connections from the same JVM are allowed).
An "embedded Derby application"
is one which runs in the same JVM as the application. Such an application
uses the embedded Derby driver
(org.apache.derby.jdbc.EmbeddedDriver) and connection URL (jdbc:derby:databaseName).
If you use this driver name or connection URL from the IDE, when the IDE tries
to open a second connection to the same database with the embedded Derby,
the attempt fails. Two JVMs cannot connect to the same database in embedded
mode.
- IDEs and multiple JVMs
When you use an integrated development environment (IDE) to build a Java application, you can launch the application from within the IDE at any point in the development process. Typically, the IDE launches a JVM dedicated to the application. When the application completes, the JVM exits. Any database connections established by the application are closed.
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