output: #fixed code
                               @Test
  	public void freemarkerEngineTest() {
  		// 字符串模板
  		TemplateEngine engine = TemplateUtil.createEngine(
  				new TemplateConfig("templates", ResourceMode.STRING).setCustomEngine(FreemarkerEngine.class));
  		Template template = engine.getTemplate("hello,${name}");
  		String result = template.render(Dict.create().set("name", "hutool"));
  		Assert.assertEquals("hello,hutool", result);
  		
  		//ClassPath模板
  		engine = TemplateUtil.createEngine(
  				new TemplateConfig("templates", ResourceMode.CLASSPATH).setCustomEngine(FreemarkerEngine.class));
  		template = engine.getTemplate("freemarker_test.ftl");
  		result = template.render(Dict.create().set("name", "hutool"));
  		Assert.assertEquals("hello,hutool", result);
  	}
input: #vulnerable code 
                               @Test
  	public void freemarkerEngineTest() {
  		// 字符串模板
  		TemplateEngine engine = new FreemarkerEngine(new TemplateConfig("templates", ResourceMode.STRING));
  		Template template = engine.getTemplate("hello,${name}");
  		String result = template.render(Dict.create().set("name", "hutool"));
  		Assert.assertEquals("hello,hutool", result);
  		
  		//ClassPath模板
  		engine = new FreemarkerEngine(new TemplateConfig("templates", ResourceMode.CLASSPATH));
  		template = engine.getTemplate("freemarker_test.ftl");
  		result = template.render(Dict.create().set("name", "hutool"));
  		Assert.assertEquals("hello,hutool", result);
  	} 
                              #location 6 
                              #vulnerability type NULL_DEREFERENCE