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    <p>I'm not an Eclipse expert, but I think that your problem can be answered like this:</p> <p>1) CLASSPATH is an environment variable that is read in when you launch java programs and is used by classloader to figure out where the classes are placed.</p> <p>I would modify the CLASSPATH variable only in the case when you are launching an java program from a script, as this allows you to conveniently launch a program and make sure that the classes are found. This would not be the case for you, as you are developing the web application.</p> <p>2) WEB-INF/lib is the directory under which the web application container's classloader (like tomcat or glassfish) looks into if your web application needs to resolve a class. So you put there the classes that are used in your web application.</p> <p>Some IDE's do include the libraries/.jar files that you are using in a project automatically to the package.</p> <p>3) Eclipse library/classpath resolving during the development time. I would assume, but apologies for assuming, as one really shouldn't do this ;), that you can define a library (add external .jar files to projects) and autocomplete/all the other interesting features should start working with this, as you basically make those classes visible for the IDE with that activity. I also would assume that you can then mark those libraries to be automatically added to the web projects etc., by the IDE.</p> <p>In general a good reading about how classes are found during execution is <a href="http://java.sun.com/j2se/1.4.2/docs/tooldocs/findingclasses.html" rel="nofollow noreferrer">here</a> (it's a sun's official documentation). Also a good place to read about this is the ClassLoader class documentation.</p>
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    1. POCLASSPATH, Java Buld Path (eclipse), and WEB-INF\LIB : what to use, when, and why?
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    1. USLaazik
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    1. CO(1) No, Eclipse wants libraries explicitly made known via the project's build path. (2) Sun's class loader documentation is authoritative, complete and instructional, but when it comes to working in an IDE, it's only useful as background info. Eclipse works hard to abstract these issues for the user; while generally beneficial, this can be confusing for beginners.
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      1. USCarl Smotricz
 

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