JsonString to JavaObject at runtime

Question

I am trying to convert JSON String to Java Object at runtime. Is it possible?

        String className = errorInfo.getClassName();
		String methodName = errorInfo.getMethodName();
		String requestMessage = errorInfo.getMessage();
		String reference3 = errorInfo.getReference3();

		try {
			Class claz = Class.forName(className);
			Object obj = claz.newInstance();
			Class[] parameterTypes = new Class[1];
			parameterTypes[0] = Class.forName(reference3).getClass();
			Method method = claz.getMethod(methodName, parameterTypes);
			method.invoke(obj, new      
            ObjectMapper().readValue(requestMessage,<I have to pass here .class reference>>));
          }
          catch(Exception ex)
{
}

Please check this post and this post to actually understand how to load the class into JVM and then using the Jackson as you are using to convent it. — Hearen
– Hearen, Commented May 9, 2018 at 12:14

Ram Pratap · Accepted Answer · 2018-05-10 06:24:07Z

1

I was making basic mistake. Following code worked for me:

    String className = errorInfo.getClassName();
    String methodName = errorInfo.getMethodName();
    String requestMessage = errorInfo.getMessage();
    String reference3 = errorInfo.getReference3();

    try {
        Class<?> claz = Class.forName(className);
        Object obj = claz.newInstance();
        Class[] parameterTypes = new Class[1];
        Class<?> parameter = Class.forName(reference3);
        parameterTypes[0] = parameter;
        Method method = claz.getMethod(methodName, parameterTypes);
        method.invoke(obj, new 
        ObjectMapper().readValue(requestMessage,parameter));

    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

answered May 10, 2018 at 6:24

Ram Pratap

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