I have a few really long strings in one class for initializing user information. When I compile in Eclipse, I don\'t get any errors or warnings, and the resulting .jar runs
Did you try this? Never tried it myself, but here is the relevant section:
Using the ant javac adapter The Eclipse compiler can be used inside an Ant script using the javac adapter. In order to use the Eclipse compiler, you simply need to define the build.compiler property in your script. Here is a small example.
I would really consider making your classes standards compatible. I believe the official limit is 65535, and the fact that Eclipse is more lenient is something that could change on you at the most inconvenient of times, and either way constantly having to get the project compiled with Eclipse can really start to limit you in too many ways.