The objective is simple, create a method which load a class dynamically, access its method and passing their parameters value and getting the return value at run-time. To do that is possible to use Java reflection.<\/p>\n
\r\ntry {\r\n\tClass clazz = Class.forName(\"package.myclass\");\r\n\tMethod mth = clazz.getDeclaredMethod(\"method\", String.class, String.class);\r\n\tObject source_class = clazz.newInstance(); \r\n}\r\ncatch (SecurityException ex) {\t\t\t\t\r\n\treturn null;\r\n}\r\ncatch (NoSuchMethodException ex) {\r\n\treturn null;\r\n}\r\ncatch (IllegalArgumentException ex) {\r\n\treturn null;\r\n} \r\ncatch (IllegalAccessException ex) {\r\n\treturn null;\r\n} \r\ncatch (InvocationTargetException ex) {\r\n\treturn null;\r\n}\r\n\r\nlogger.debug((String) mth.invoke(source_class, \"Param1\", \"Test ${medicationGenericName}\"));<\/pre>\nIn this case the method needs two string as parameter and returns a string. <\/p>\n
If the constructor of the class needs a parameter (i.e. the application context because the @Autowired doesn’t works), this is the code needed:<\/p>\n
\r\nClass clazz = Class.forName(\"package.myclass\");\r\nConstructor constructor = clazz.getDeclaredConstructor(ApplicationContext.class);\r\nMethod mth = clazz.getDeclaredMethod(\"method\", String.class, String.class);\t\t\t\t\r\nObject source_class = constructor.newInstance(applicationContext); \r\n<\/pre>\nShare this:<\/h3>