public static Compiler getCompiler() {
        if (AbstractCompiler.COMPILER == null) {
            AbstractCompiler.COMPILER = new JavassistCompiler();
        }
        return AbstractCompiler.COMPILER;
    }
@author william.liangf
@author Robert HG (254963746@qq.com) on 9/12/15.
lts-core/src/main/java/com/github/ltsopensource/core/compiler/AbstractCompiler.java