Classpath error in compiling

Hi,
I am trying to compile a very simple program. Here is the problem I am having.
I have a package called realtime.core. In there is a class called Queue. When I try to compile, the compile complains saying Found class Queue in realtime_class.realtime.core rather than package realtime.core
If i remove the path to the folder containing realtime/core, the error just says cannot find realtime.core. When I put back the path to realtime/core, the above error comes back.
i cannot understand where the realtime_class comes from. At some point I tried to use eclipse to reference to the folder as realtime_class, but I deleted tha project. I even changed the location of the entire jar, but it still references to it as realtime_class. I really appreciate any input.
BTW, I reinstalled the JAVA jdk but it did not help at all.
Thank you!

Take a look at where eclipse is putting the source and see what is going on. Maybe there is a class in the root with the same name?
It sounds like a configuration problem of some sort but hard to tell what.

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