03-10-2005
Usually I just set the classpath as an option to the java or javac command, instead of setting the CLASSPATH environment variable because it is likely that running/compiling one Java program needs a classpath different from another. Setting this environment variable overrides the default classpath up until the current session terminates. Sometimes you may not realize this environment variable is set, but somehow it has been defined somewhere, and you may get lots of classpath errors despite there should not be if it is not set (I have seen articles telling people to set the CLASSPATH in shell startup scripts, like .profile and the like).
A better way to manage all these is to write an Ant build file, similar to the concept of Makefiles, which has directives to override the list of classpaths. You can write a build file with two targets, one to compile it and another to run it. Then you can avoid a lot of troubles thereafter for writing really loooooong command-line arguments, as Ant knows how to compose the exact commands for you. It is particularly handy for projects that need to override the build paths.
More info?
http://ant.apache.org
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asant(1M) Application Server Utility asant(1M)
NAME
asant - launches the Jakarta Ant tool
SYNOPSIS
asant target_list
Use the asant command to automate repetitive development and deployment tasks. asant is a shell script that invokes the underlying Ant in-
frastructure after initializing the environment to pickup the application server installed targets.
To use Ant as part of the Sun ONE Application Server, verify that your PATH includes the provided asant (Solaris) ant.bat(Windows) script.
The bundled sample applications use asant extensively; however, asant can be used in any development or operational environments.
The build targets are represented in the build.xml files that accompany the sample applications.
To use the Ant tool to compile and reassemble the sample applications, verify that the $AS_INSTALL/bin directory is on your environment's
path. On UNIX, add the $AS_INSTALL/bin directory to your PATH environment variable. On Windows, after installing the Sun ONE Application
Server, set the system path by adding $AS_INSTALLin to the user PATH. You can access the PATH system variable from: Start menu, Settings,
Control Panel, System, Advanced, Environment Variables, User Variables for Administrator, PATH.
The target_list is one or more space separated tasks as described below.
TARGETS
compile compiles all Java source code.
jar assembles the EJB JAR module.
war assembles the WAR file in <sample_dir>/assemble/war
ear assembles the EAR file in <sample_dir>/assemble/ear
core (default) compiles all sources, builds stubs and skeletons; and assembles EJB JAR, WAR and EAR files. This is the
default target for all build.xml files shipped in the Sun ONE Application Server.
javadocs creates Java docs in <sample_dir>/javadocs
all builds core and javadocs , verifies and deploys the application, and adds the resources..
deploy deploys the application and automatically expands the EJB JAR; does not install Javadocs.
undeploy removes the deployed sample from the Sun ONE Application Server.
clean removes <appname>/build/ and <appname>/assemble/ and <appname>/javadocs directories.
verify verifies the deployment descriptors in the sample.
Example 1: Compiling and Assembling a Sample Application
Using the simple stateless EJB sample as an example, execute several of the build targets as follows:
cd install_root/samples/ejb/stateless/simple/src
Execute the compile target to compile the Java sources as follows:
asant compile
Execute the war, ear, and ejbjar target to assemble the J2EE module files and the EAR file as follows by:
asant jar
asant war
asant ear
Alternatively, all the above tasks can be accomplished by:
asant core
Since the default build target is core you can execute asant without any arguments to rebuild the entire application.
Example 2: Building Web-based Applications
You can build everything, including installing Javadocs, and deploying the application by:
asant all
Additionally, you can build everything, except the Javadocs, but deploy the application by:
asant core
or just,
asant
then,
asant deploy
To rebuild the ear after you have modified the deployment descriptors without recompiling:
asant ear
asant deploy
Apache Software Foundation at http://www.apache.org, Jakarta Ant documentation at http://jakarta.apache.org/ant/index.html.
SUNWant documentation located in /usr/sfw/share/doc/ant
, asadmin(1M)
Sun Java System Application Server March 2004 asant(1M)