Eclipse没有看到CLASSPATH

Question

I have some JAR files on my CLASSPATH environment variable. When I open cmd and enter echo %CLASSPATH% , the paths to those JARs are part of the output. When I try to compile and run a java class through cmd that imports classes from these JARs, it works, and I don't have to add the JARs with -cp .

But when I try to import these classes in Eclipse, it doesn't work. The import cannot be resolved. I have to add them to the build path.

This means that when I get a new version of a library, I have to add it to the build path, and remove the old version, for each project that uses the library. I also have to recompile the projects that I have runnable JARs of, because each uses its own separate copy of the library (which, by the way, just seems wasteful and unnecessary). If it worked as I intended, I'd only have to change the version number in CLASSPATH .

Is it possible to make it work like I intended? Or is there a better way to handle JARs and JAR updates?

Answer 1

You can define a User Library in the preferences and refer to that in your projects' Java Build Path s, changing the JAR files it contains as needed. For updating your runnable jars automatically, that might well be better suited to a system such as Ant or Maven. As for having redundant copies in your Runnable JARs, that's just part of what makes them "runnable."