Installation guide

Table Of Contents

2. MICROSOFT IIS PLUGIN (WINDOWS)

2.2.3.1 Multiple JDK/JRE Versions Installed

You may have multiple versions of the JDK/JRE installed on your system.

ServletExec/ISAPI (including the installer) uses registry entries to determine which

installed JDK/JRE to use. It will look for an installed JDK first and if it doesn’t find one

it will look for a JRE. It will look for JDK/JREs from vendors in the following order: Sun

Microsystems, and then IBM. Here’s the complete algorithm:

1. Look for a Sun JDK using the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit

 If Sun JDK found, go to Step 2. Otherwise, look for a Sun JRE using the

following key:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment

 If Sun JRE found, go to Step 2. Otherwise, look for an IBM JDK or JRE using

the following keys .

HKEY_LOCAL_MACHINE\SOFTWARE\IBM\Java Development Kit

or…

HKEY_LOCAL_MACHINE\SOFTWARE\IBM\Java Runtime Environment

 If no Sun or IBM JDK/JRE found using the above registry keys, then abort

ServletExec installer.

2. Read the

CurrentVersion variable from the key found in Step 1. Currently, the

only valid values for this variable start with “1.3” or “1.4” (including, for example

“

1.4.2”).

3. Append the value of the

CurrentVersion variable from Step 2 to the key from

Step 1 to create a new key. For example:

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Development Kit\1.4

or…

HKEY_LOCAL_MACHINE\SOFTWARE\JavaSoft\Java Runtime Environment\1.4

4. Read the value of the JavaHome variable for the key from Step 3 to find the

location of the JDK or JRE.

If you launch the

DBMON debugging tool and then restart your web server,

ServletExec/ISAPI displays the Java VM settings in the

DBMON console window during

initialization. You can examine the classpath displayed by ServletExec/ISAPI in the

DBMON console window to see which version of the JDK is being used.

See Section 12.4 of the ServletExec 5.0 User Guide for a discussion of

DBMON.

2.3 Uninstalling Other Servlet Engines

Very Important

You must uninstall any other servlet engines previously installed for use with Microsoft IIS

before installing and using ServletExec/ISAPI. In particular, the Filter DLL registry entries or

ISAPI Filters metabase entries associated with other servlet engines must be removed

ServletExec 5.0 Installation Guide 6