This article contains frequently asked questions (FAQ) regarding WebObjects 4's support for the Java programming language, with answers to those questions.

Questions answered in this article:

1. What JDK version is used in WebObjects?
2. Can I use a different Java version?
3. Does Apple support Just-in-Time (JIT) compilation with WebObjects 4?
4. How do I debug Java code in ProjectBuilder?

Question 1: What JDK version is used in WebObjects?

Answer : WebObjects 4 uses Sun's 1.1.6 JDK. This is the only version officially supported by Apple. In addition, WebObjects 4 supports Sun's Swing interface library, version 1.0.3.

Question 2 : Can I use a different Java version?

Answer : You may be able to run later versions of Java by simply pointing the JDK environment variable to the new version and modifying your JavaConfig.plist file; however, Apple will not provide support for any version of Java other than the one which shipped with WebObjects 4. Because WebObjects is designed to work with Sun's Java VM, Microsoft's Java VM will not work with WebObjects.

For an unsupported procedure that can be used to update the WebObjects JDK version, see article 70064 .

Question 3 : Does Apple support Just-in-Time (JIT) compilation with WebObjects 4?

Answer : JIT functionality is not available in this release of WebObjects. WebObjects applications spend much of their time running compiled framework code; the speed benefits of this approach are greater than would be seen with JIT-compiled Java code.

Question 4 : How do I debug Java code in ProjectBuilder?

Answer : WebObjects 4's Project Builder includes a Java debugger based on Sun's jdb. For more information on debugging Java code, see the appropriate section of the WOInfoCenter.