Trouble compiling servlets with J2SE 5

Hello,
I've been using Sun 1 Studio CE, and more recently, Netbeans 3.6, with J2SE 1.4.2. I have some basic swing applets and servlets that I wrote for my business' web site.
I recently downloaded and installed the new software bundle containing Netbeans 4.0 and J2SE 1.5. When I try to compile my servlets, I get a compiler error that packages javax.servlet.* and javax.servlet.http.* do not exist.
I reinstalled J2SE 1.4.2 and Netbeans 3.6 and the servlets compile fine.
Why is JDK 5 not able to find these packages? My understanding is that they're part of the Java Servlet API, which I never explicitly downloaded previously. Is that the piece of the puzzle that I'm missing? Please help!
Thanks

Thanks for your response...
What is interesting is that I never explicitly installed the Servlet API. Out of curiosity, I searched my computer for servlet*.jar and came up with 13 files including:
servlet-2.2.jar
servlet-2.3.jar
servlet-api-2.4.jar
These were located in subdirectories under Netbeans 3.6 and Tomcat 5.0.19. Therefore, I'm assuming that when I downloaded the JDK 1.4.2/Netbeans 3.6 bundle from the Java site, the Servlet API must have been part of the bundle.
****Let me check something...***
I've just done the same search for servlet*.jar on my test PC, which has the Netbeans 4.0/JDK 5 bundle installed. The same files exist, in the same locations(almost the same, anyway; the Tomcat and Netbeans 4 directory structures are a little different).
Both software bundles contain the same files, yet 1.4.2 compiles without any problems or additional configuration. In other words, I reinstalled the old 1.4.2/ Netbeans 3.6 bundle, took my existing source code, and started compiling.
Any ideas why the same isn't true for JDK 5/Netbeans 4? I know there are changes to the way Netbeans 4.0 deals with Class Paths, but I thought that was for the classes I've written. Shouldn't the compiler be able to find the servlet API, since it bundled/installed with everything else?
Thanks

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