Eclipse not building

Hi. I have a lift project with scala, maven (m2), and GAE natures. It was working fine (except not running an ant script automatically when added as a project builder, or the enhancer). However, now the scala builder either doesn't run or terminates in middle (it goes until 4%-5%). Cleaning deletes the output folder and creates them (sometimes even the package folders) but no class files. There doesn't seem to be any stack traces etc. in the error log, the eclipsec.exe console, or the log file, although the console does say building xx.scala for a number of files. I tried enabling/disabling various project builders. Enabling the scala builder and the maven scala builder always gave an error that jline.dll was already loaded, so I commented it out of the POM, but when I switch to using it, I get a bunch of errors along the lines that net is not a member of <root>. The maven dependencies are all there in the project explorer.
I also tried closing, cleaning, refreshing, and restarting eclipse.

Hi. I have a lift project with scala, maven (m2), and GAE natures. It was working fine (except not running an ant script automatically when added as a project builder, or the enhancer). However, now the scala builder either doesn't run or terminates in middle (it goes until 4%-5%). Cleaning deletes the output folder and creates them (sometimes even the package folders) but no class files. There doesn't seem to be any stack traces etc. in the error log, the eclipsec.exe console, or the log file, although the console does say building xx.scala for a number of files. I tried enabling/disabling various project builders. Enabling the scala builder and the maven scala builder always gave an error that jline.dll was already loaded, so I commented it out of the POM, but when I switch to using it, I get a bunch of errors along the lines that net is not a member of <root>. The maven dependencies are all there in the project explorer.
I also tried closing, cleaning, refreshing, and restarting eclipse.