Answer: You can ignore these erros. They relate to the graphing tool that comes with the farm simulation. We do not use it for this project.
Answer: The old radar.tar.gz file had some files that shouldn't be there (their names start with ._). I removed these files and overwrote the old radars with a new one here.
Now after unzipping this tar and running 'make' under radar, you may get a message that nothing needs to be done. What's happening is that 'make' doesn't realize that it needs to re-create the class files. A quick solution is to 'touch' all source files using
touch src/farm/radar/agent/*
touch src/farm/radar/agent/utilities/*
touch src/farm/radar/plugins/*
Now when you run 'make', you'll see it's making something!
Alternative A qicker way of doing this is to do the following (thanks to Jeff Dalton for pointing this out)
cd farm
make clean
make
cd radar
make clean
make
Answer: You can try the solution in this link (thanks to Tian Guo).
Answer: Thats supplied to you at runtime. Its dynamic and randomly set by the simulator every run. The RadarMetAgent.java class has variables that regulates the number of the radars and tasks that will be provided to you at every run however.