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Chapter 3 — Developing and Using RFID Applications

58 IF61 Fixed Reader User’s Manual

For more sophisticated Java development, the IF61 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 IF61 each time.

To use OSGi effectively, you need an OSGi server. For more

information, go to www.osgi.org.

Executing Java Applications

To execute a Java application on the IF61, use this command:

$JAVA_HOME/bin/java myJavaClass

To execute .jar files, use this command:

$JAVA_HOME/bin/java -jar myApplication.jar

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 installation 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 IF61.

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

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.

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Intermec IF61 Manual de usuario Pagina 72