SetProperty in JSP with JavaBeans

Question

Why do they always talk about the following code in JSP's for getting or setting property's in a JavaBean.
<jsp:setProperty name="dbb" property="dbDriver" value="<%= set.getDbDriver()%>" />
Because it is also possible by just calling this "dbb.setDbdriver(set.getDbDriver())" setting-methode.
Is there also a specific code to call normal methods, no set or get method, of a JavaBean in a JSP
for something like "dbb.execSQL(String sql)".

Answer 1

One of the reasons for JSPs existence is to separate the presentation logic from the business and control logic. The rationale is that the skills required to design a user interface are different than programming skills, so creators and maintainers of JSPs may not be Java programmers. In this scenario, there is no Java scripting in a JSP. All data and business logic is encapsulated in beans and/or custom tags accessed from the page. That's why the useBean, getProperty and setProperty tags exist. Check out the web for info on the Model, View, Controller framework.
There are no built-in JSP tags to call bean methods that require arguments or do not have get/set methods. Custom tags could do this job if necessary.
Whether you follow this approach is your call and, among other things, depends on the skills of those who will be maintaining your JSPs in the future.