Frequently Asked Questions and Answers about Java on the UM Research Server

1. What is willow's IP address?
   130.74.110.16
   
2. How can I apply for an account on willow?
   Visit the UM IT Helpdesk in Weir Hall.
   
3. What versions of Java are installed, and where are they located on willow?

• The Java 2 Software Development Kit (1.5.0) and runtime environment (in /usr/jdk/jdk1.5.0_01)
• The Java 1 Software Development Kit (1.1.6) and runtime environment (in /usr/java1.1/). This is the default installation--the one pointed/linked to by /usr/java.
• The Java 2 Software Development Kit, Standard Edition (1.3.0) and runtime environment (in /usr/java2se/)
• The Java 2 Software Development Kit, Enterprise Edition (1.2.1) (in /usr/local/j2sdkee1.2.1)

4. What environment variable settings are necessary for me to compile and run java programs?
   The short answer is: probably none, but possibly, CLASSPATH and PATH might need to be modified. Try running the Hello World Program in Java tutoral (see the next question below). If you have trouble, you may need to revisit this question.
   The long answer is: You should ensure that /usr/java/ is in your PATH variable. (If you want to the Java 1, rather than the Java2, environment to be your default, then you should have /usr/java1.1 in your path, before /usr/java or /usr/j2se.)
   You shouldn't have to set CLASSPATH, but if you do, it should probably contain ./, so that classes in your current directory can be found when you invoke the java runtime environment. If you are compiling any code which references any of the Enterprise Edition classes, and/or which requires MySQL JDBC drivers, you will need to either:
   Ensure that CLASSPATH includes: /usr/local/j2sdkee1.2.1/lib/j2ee.jar:/usr/local/j2sdkee1.2.1/lib/mm.mysql-2.0.4-bin.jar, or
   Use the -classpath argument to javac as /usr/local/j2sdkee1.2.1/lib/j2ee.jar:/usr/local/j2sdkee1.2.1/lib/mm.mysql-2.0.4-bin.jar, where you have previously set J2EE to /usr/local/j2sdkee1.2.1/, so that the compiler will know where to find, not only your own source class files, but also the J2EE class files and the JDBC/MySQL driver class files. command-line argument, with a script to Compile an Enterprise Java Bean's Source Code.
5. How can I get started writing, compiling, and running java programs on willow?>
   To use the Java 2 SDK, Standard Edition: See Sun's Java Tutorial: Your First Cup of Java (for UNIX)
   To use the Java 2 Enterprise Edition: See Sun's Java 2 Enterprise Edition Developer's Guide
6. I want to connect to a MySQL database on willow. What MySQL driver is installed on willow?
   The mm.mysql type4 driver is installed. The absolute path is: /usr/local/j2sdkee1.2.1/mm.mysql-2.0.4-bin.jar. The driver was downloaded from here.
7. What process was used to install and configure Java 2 SDK on willow? The following describes the steps that were used to install and configure Java 1.2 on willow, per Sun's instructions at: Java Installation Notes
   1. Downloaded the j2sdk-1_3_0_02-solsparc[1].tar.Z bundle of the binary distribution of the Java 2 SDKStandard Edition (1.3.0) for Solaris SPARC/x86 from http://java.sun.com/j2se/1.3/download-solaris.html, and saved it in the /tmp directory.
   2. Used zcat to extract the contents of the bundle, as follows:
      zcat "j2sdk-1_3_0_02-solsparc[1].tar.Z" | tar -xf
      This resulted in the creation of four packages: SUNWj3dem, SUNWj3dev, SUNWj3man, and SUNWj3rt, in /tmp.
   3. As root, installed the packages as follows:
      pkgadd -d . SUNWj3rt SUNWj3dev SUNWj3man SUNWj3dem
      This installed Java in /usr/js2e
   4. As root, made this distribution the default Java for the machine, by creating/changing /usr/java to be a symbolic link to /usr/js2e, as follows
      ln -s /usr/java /usr/js2e
      per the directions in Installation Notes
   5. Downloaded the Java Beans Activation Framework 1.0.1, and unzipped the activation.jar file and accompanying contents into /usr/local/j2sdkee1.2.1/lib/jaf-101/
   6. Downloaded the JavaMail 1.2 API and unzipped the imap.jar, mail.jar, mailapi.jar, pop3.jar, and smtp.jar files, as well as accompanying documentation, into the /usr/local/j2sdkee1.2.1/lib/javamail-1.2