*/
public static Object javac(String line) throws Exception {
// Get the compiler
Compiler compiler = JavaCompilerCompiler.loadJavaCompiler();
// Parse the file
FileUnit fu = compiler.parse(new JavaTokenizer(new StringReader(String.format(source,line)))) ;
// Create a class loader with the parsed ExprEval.
ClassLoader loader = ClassConverter.createLoader(StdJavaExpressions.INSTANCE,new FIFO<FileUnit>(fu)) ;
// invoke expr.
Method m = loader.loadClass("ExprEval").getMethod("expr") ;