Apache Struts Interview Questions and Answers

1 :: How the exceptions are handled in struts?

Exceptions in Struts are handled in two ways:

► Programmatic exception handling :
Explicit try/catch blocks in any code that can throw exception. It works well when custom value (i.e., of variable) needed when error occurs.

► Declarative exception handling :You can either define <global-exceptions> handling tags in your struts-config.xml or define the exception handling tags within <action></action> tag. It works well when custom page needed when error occurs. This approach applies only to exceptions thrown by Actions.

<global-exceptions>
<exception key="some.key"
type="java.lang.NullPointerException"
path="/WEB-INF/errors/null.jsp"/>
</global-exceptions>

or

<exception key="some.key"
type="package.SomeException"
path="/WEB-INF/somepage.jsp"/>

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2 :: What are the various Struts tag libraries?

The various Struts tag libraries are:

► HTML Tags
► Bean Tags
► Logic Tags
► Template Tags
► Nested Tags
► Tiles Tags

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3 :: How to display validation errors on jsp page?

<html:errors/> tag displays all the errors. <html:errors/> iterates over ActionErrors request attribute.

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4 :: What is DynaActionForm?

A specialized subclass of ActionForm that allows the creation of form beans with dynamic sets of properties (configured in configuration file), without requiring the developer to create a Java class for each type of form bean.

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5 :: What is SwitchAction?

The SwitchAction class provides a means to switch from a resource in one module to another resource in a different module. SwitchAction is useful only if you have multiple modules in your Struts application. The SwitchAction class can be used as is, without extending.

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