Installing JRun
Before You Begin

Upgrading JRun

Upgrading to JRun 4 lets you take advantage of the many additions to JRun, including the new features and full capabilities of the most recent Sun J2EE 1.3 platform specifications. For information about how JRun 4 differs from earlier versions, see "Notable changes in JRun 4," in Chapter�4.

By default, the JRun 3.1 installation script installs JRun in C:\Program�Files\Allaire\JRun (Windows) and /opt/jrun (UNIX). The default location for installing JRun 4 is C:\JRun4 (Windows) and /opt/jrun4 (UNIX). You can run both versions concurrently if you install them in their default locations (Windows) or you must do one of the following:

• Move your existing JRun directory to a new location.
• Install JRun 4 in a new location.

By default, JRun 4 installation dynamically assigns web server port numbers that are not in use. When you add JRun servers, review the existing port settings and ensure that you assign unused ports. For more information on understanding JRun ports, see the JRun Administrator's Guide.

JRun 4 includes a migration tool that assists you in migrating JRun 3.1 servers to JRun 4. The migration tool updates the server properties files, web application files and settings, port settings, and EJBs to JRun 4.

To upgrade from JRun 3.1 to 4:

1. Install JRun 4 in a different directory location from JRun 3.1.
2. From the jrun_root/bin directory of your JRun 4 installation, run the migration tool. For details, see "Running the migration tool," in Chapter�4.

For detailed information on migrating applications, see "Moving to JRun 4," in Chapter�4.

Updating or removing JRun

If you installed JRun 4, and want to modify, repair, or remove the program, use the following procedure.

To remove JRun on Windows:

1. Execute the JRun 4 installation file.

   The Welcome window appears.

2. Click Next.

   The Program Maintenance window appears.

   Select one the following options:

   Option	Description
   Modify	Lets you select JRun options to install.
   Repair	Repairs installation errors. If you select this option, JRun fixes missing or corrupt files, shortcuts, and registry entries.
   Remove	Removes previous installations of JRun.

3. Select an option and click Next.
4. To review or change any of the installation settings, click Back. Click Install or Remove to begin the operation.
5. Click Finish to exit the wizard.

To remove JRun on UNIX:

• From the jrun_root/UninstallerData directory, enter the command:

  sh Uninstall_JRun_4
  

Running multiple JRun 4 versions

To run multiple JRun 4 versions on the same system or back up your JRun 4 installation while testing a newer version, use the following procedure (Windows only).

To run multiple JRun 4 versions:

1. Install JRun 4 on Windows.
2. With JRun 4 not running, rename the JRun installation directory.
3. Run the JRun 4 installation file.

   The JRun4 Install Wizard window appears:

4. Click Next.

   The Program Maintenance window appears:

5. Select Remove and click Next.

   Note:   This will not remove JRun 4 from the renamed directory.

6. To begin the operation, click Remove.
7. To exit the wizard, click Finish.
8. Run the JRun 4 installation file again and follow the installation steps.

   For details, see "Installing JRun".

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