Very commonly, a JavaFileObject is needed as the initial input for compilation using JavaCompiler.getTask. Often, classes like this are created:
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    private static class JavaSource extends SimpleJavaFileObject {

        private String code;

        public JavaSource(String code) {
            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
            this.code = code;
        }

        @Override
        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
            return code;
        }
    }
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It would be nice to have some more general support to create input-only source JavaFileObject.