I\'ve got a simple Dynamic Web project set up in Eclipse 3.6 Helios, but am having trouble getting it to make use of the code in another project that I\'ve got.
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Use some build tool like ANT or Ivy or Maven that, on build, copies all the dependencies to WEB-INF/lib
Using a build tool is a good practice to automate build, test and deployment. You may also be interested in plug-ins like Maven Reactor.
What goes in the deployment is determined not by the build path but by the Deployment Assembly entry in Preferences for the dynamic web project.