Javac VS JBuilder's bcj

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Error #: 750 : initialization error: com.borland.compiler.symtab.LoadError: neither class nor source found for java.lang.Object
warning #908: can not append file ...
My WebLogic project won't compile on JDK 1.3. I get "Error #: 300 : method getAction() not found in class javax.swing.AbstractButton", and others.
JBuilder's obfuscator is pretty weak. Where can I find a better one?
Where can I find a complete list of JBuilder4 compiler error messages?
JBuilder won't compile just one file. No matter what, it compiles more stuff than I want. How can I make JBuilder compile only the file I want compiled?
I want to compile my Java application into .exe (or some other native binary form.) How do I do this with JBuilder?
I'm trying to compile a project and I'm getting something about "Error 900: out of memory". This project doesn't seem to be that big.
Error#2301:Internal compiler error: com.borland.compiler.symtab.CompilerError: unexpected type: null
I am not receiving the deprecation warnings I expected. The "show deprecation warnings" setting is enabled.
I am getting "sealing violation" exceptions when I run/compile my project. What does this mean?
Are there any tools available to help diagnose classpath problems?
I can add a whole package to my project and edit the source code. However, when compiling, you have to right click the desired package and the only that package is compiled. Any packages within the selected package are NOT compiled.
I'm trying to use the new JDK 1.4 betas, and JBuilder (of any version) gives me the following message when I try to build my projects: "Error #: 750 : initialization error: com.borland.compiler.symtab.LoadError: class file has wrong version 48.0"