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IF2 Network Reader User Guide 37
For more sophisticated Java development, the IF2 supports the open standard
OSGi service-oriented architecture. This allows system administrators to install,
uninstall, enable, and disable system services (also known as bundles) without
having to reboot the IF2 each time. To use OSGi effectively, you need an OSGi
server. For more information, go to
www.osgi.org .
Execute Java Applications
To execute a Java application on the IF2, use this command:
$JAVA_HOME/bin/java myJavaClass
To execute .jar files, use this command:
$JAVA_HOME/bin/java -jar myApplication.jar
Note: Your .jar files must have manifest files included within them, or the command will not
work:
• The manifest needs to include an attribute called “Main-Class” to specify the
application’s entry point (for example, Main-Class: MyJavaClass).
• If the executable .jar needs to reference other .jar files, specify the files in the
manifest file using the “Class-Path” attribute.
To enable the Java just-in-time (JIT) compiler for maximum performance, use this
command:
$JAVA_HOME/bin/java -jit java -jar MyJar.jar
where:
$JAVA_HOME
is an environment variable that indicates the Java runtime installa-
tion path (/usr/java). Always use this variable for simplicity and to insure that the
correct runtime files are used.
java
is the name of the Java runtime executable installed in the IF2.
If your application references third party Java libraries (such as components from
the Intermec RFID Resource Kit), you must use the “-cp” option to specify the class
path for the JVM to find the Java classes. Be sure to include the current path so
classes in the current directory can be found, as shown in this example:
$JAVA_HOME/bin/java -cp .:./BasicRFID.jar MyClass
Java Support for Microsoft SQL Server and Sybase
The IF2 jTDS driver (version 1.2) provides JDBC capabilities to Java applications
running on the IF2. You need to include the location of JDBC drivers in the class
path. Use the environment variable $JDBC_HOME as shown in this example:
$JAVA_HOME/bin/java -cp $JDBC_HOME/jtds-j2me-1.0.2.jar:. MyClass
The IF2 JDBC driver supports JDBC 1.0 and:
• Microsoft SQL Server versions 6.5, 7, 2000, and 2005.
• Sybase versions 10, 11,12, and 15.