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Technical Information
 Fix Java Errors With ConsoleOne On Linux

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Posted: 21 Apr 2005

Running ConsoleOne on Linux can be a small adventure. With multiple runtime environments to choose from and different implementations in the distributions, getting ConsoleOne up and happy requires a little understanding.

In order to run, ConsoleOne needs to be able to find a proper Java Runtime Environment. When trying to get ConsoleOne up and running, verify first the JRE, then make sure ConsoleOne can find it.

Verify A Working JRE Is Installed

The question of ensuring a proper JRE is installed is fairly complex. The main options for the JRE are IBM Java, Sun Java, and Novell's JRE that is included in the ConsoleOne package.

The easiest way to give recommendations is by distribution and product, so here goes:

  • SUSE LINUX 8, including SLES8 You can use the IBM Java package that comes with the system. Due to variances in updates; however, the best practice is to allow the ConsoleOne install to install the Novell JRE, which works well with the 2.4 kernel.
  • SLES9 Never use the IBM Java package 1.4.2 included in SLES9. Also do not allow ConsoleOne to install the Novell JRE package. The best bet is to install the Sun JRE, which is included in the SLES9 distribution.
  • NLD, SUSE LINUX Professional 9.2, 9.3, OES These distributions install and use the Sun JRE by default, so they'll work without an additional installation.
  • Novell Linux Small Business 9 The ConsoleOne package included in NLSB9 has an updated Novell JRE, so allow ConsoleOne to install the Novell JRE during the install. Note that the Novell JRE on NLSB9 can be installed on any 2.6 kernel and work. The package novell-c1-sdd is installed by default and sets up LSB to deliver ConsoleOne to client systems from the directory /opt/novell/ConsoleOne/software.
  • RedHat, other distributions Users have confirmed ConsoleOne running on the Sun JRE on RedHat and other distributions. The Sun JRE can be downloaded at http://www.java.com/en/download/linux_manual.jsp

The easiest way to make sure the JRE is installed and working right is to use YaST to search for java or jre.

Make Sure ConsoleOne Can Find The Correct JRE

The script that starts ConsoleOne is located at /usr/ConsoleOne/bin/ConsoleOne. Looking in the script reveals code that tries to find the JRE to use. The code is also set up to give precedence to certain locations. The priority is as follows (from highest to lowest):

  • C1_JRE_HOME an environmental variable
  • /usr/ConsoleOne/jre/jre to account for the Novell JRE being installed
  • /usr/ConsoleOne/jre the default location for the Novell JRE that is installed by ConsoleOne
  • JRE_HOME the standard JRE environmental variable

Note: You can also enable code in the ConsoleOne script to use Compaq Java and IBM Java.

You should verify that ConsoleOne can find the correct JRE on your machine. The first step to take is to see what the environmental variable JRE_HOME is set to. Do the following:

#echo $JRE_HOME /usr/lib/java/jre

On many systems using the IBM Java package, JRE_HOME is set to /usr/lib/java. The example listed above is taken on a Linux Small Business 9 system.

The next step is to find if the path in JRE_HOME points to a linked file, and if so to find out what java package it is linked to. For example:

#ll /usr/lib/java lrwxrwxrwx 1 root root 12 2005-04-13 03:59 /usr/lib/java -> IBMJava2-1.4

The output indicates that the default JRE on the system is IBM Java. In this case, IBM Java 2-1.4, ConsoleOne doesn't work with the default JRE. If the default JRE is the desired JRE for your system, nothing further is required.

If ConsoleOne doesn't work with the default JRE, you'll need to point it to an alternate JRE. The two most common possibilities are as follows:

  • Novell JRE
  • Sun JRE

Novell JRE

If the system can correctly use the Novell JRE (2.4 kernels and Linux Small Business 9), then installing the Novell JRE during the ConsoleOne install is all that is required. The Novell JRE will be installed in /usr/ConsoleOne/jre and take precedence over the default JRE listed in JRE_HOME. The only problem that could arise is having C1_JRE_HOME defined in the environment, but this is unlikely as the user must explicity create and define C1_JRE_HOME.

Sun JRE

On many of the newer SUSE LINUX distributions, Sun JRE is the default JRE pointed to by JRE_HOME. If you're going to use Sun JRE on systems that don't have it as the default JRE, you need to set up ConsoleOne to find the Sun JRE folder on the system.

The first step is to find where the Sun Java package is installed on your system. Specifically, look for the jre folder. On SLES9, the Sun Java package installed by YaST will place a link to the Sun Java files at /usr/lib/SunJava2. With the Java package from http://www.java.com/ on a RedHat box, the JRE is found at /usr/java/jre1.5.0_02. The jre folder is always in the package name folder (e.g. /usr/lib/SunJava2/jre).

With the path to jre folder, you're now need to provide the path to ConsoleOne using the C1_JRE_HOME environment variable. Do the following:

  1. Open a terminal and sux to root
  2. Change to the ConsoleOne bin directory by entering cd /usr/ConsoleOne/bin.
  3. Allow root to write to the ConsoleOne script by entering chmod 755 ConsoleOne.
  4. Open ConsoleOne for editing by entering vi ConsoleOne.
  5. Under the line export the LD_LIBRARY_PATH environment variable add the line export C1_JRE_HOME=path_to_the_Sun_JRE. For example, export C1_JRE_HOME=/usr/lib/SunJava2/jre.
  6. Save and close the file.
  7. Test the change by launching ConsoleOne by entering ./ConsoleOne.






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