Compilieren zur Laufzeit

	public static void main(String args[]) throws IOException {
		System.out.println("Default Compiler: " + ToolProvider.getSystemJavaCompiler().getClass().getName());

		JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
		DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
		StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, Locale.UK, null);

		Iterable<? extends JavaFileObject> compilationUnits = fileManager.getJavaFileObjectsFromStrings(Arrays
				.asList("src//de//compiler//Hello.java"));


		JavacOption[] defaultFileManagerOptions = RecognizedOptions
				.getDefaultFileManagerOptions(new RecognizedOptions.GrumpyHelper());
		for (JavacOption o : defaultFileManagerOptions) {
			System.out.println(o.toString());
			System.out.println(o.hasArg());
			System.out.println(o.getName());
			System.out.println(compiler.isSupportedOption(o.toString()));
		}
		
		System.out.println(compiler.getSourceVersions());
		System.out.println(compiler.isSupportedOption("-g"));
		System.out.println(compiler.isSupportedOption("-verbose"));
		System.out.println(compiler.isSupportedOption("-target"));
		System.out.println(compiler.isSupportedOption("-Xlint"));
		System.out.println(compiler.isSupportedOption(OptionName.ENCODING.name()));
		List<String> options = new ArrayList<String>();
//		options.add("-encoding");
		System.out.println(OptionName.ENCODING.name());
		
		System.out.println(new OutputStreamWriter(new ByteArrayOutputStream()).getEncoding());
		
		JavaCompiler.CompilationTask task = compiler.getTask(null, fileManager, diagnostics, options, null,
				compilationUnits);
		Boolean success = task.call();
		for (Diagnostic<?> diagnostic : diagnostics.getDiagnostics()) {
			System.console().printf(
					"Code: %s%n" + "Kind: %s%n" + "Position: %s%n" + "Start Position: %s%n" + "End Position: %s%n"
							+ "Source: %s%n" + "Message:  %s%n", diagnostic.getCode(), diagnostic.getKind(),
					diagnostic.getPosition(), diagnostic.getStartPosition(), diagnostic.getEndPosition(),
					diagnostic.getSource(), diagnostic.getMessage(null));
		}
		fileManager.close();
		System.out.println("Success: " + success);
	}