Now, I have tomcat (Tomcat 8.0.37), but same errors with ant build.

Main errors are at org.apache.catalina.loader.WebappClassLoader;

1. Cannot resolve symbol 'loader'
2. Cannot resolve symbol 'WebappClassLoader'

public class LabkeyServerBootstrapClassLoader extends WebappClassLoader {

...
...
...

}
Attached a screen shot.

Thanks,
ARD