The product violates the Enterprise JavaBeans (EJB) specification by using AWT/Swing.
The Enterprise JavaBeans specification requires that every bean provider follow a set of programming guidelines designed to ensure that the bean will be portable and behave consistently in any EJB container. In this case, the product violates the following EJB guideline: "An enterprise bean must not use the AWT functionality to attempt to output information to a display, or to input information from a keyboard." The specification justifies this requirement in the following way: "Most servers do not allow direct interaction between an application program and a keyboard/display attached to the server system."
Threat Mapped score: 0.0
Industry: Finiancial
Threat priority: Unclassified
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| Phase | Note |
|---|---|
| Implementation | N/A |
Intro: The following Java example is a simple converter class for converting US dollars to Yen. This converter class demonstrates the improper practice of using a stateless session Enterprise JavaBean that implements an AWT Component and AWT keyboard event listener to retrieve keyboard input from the user for the amount of the US dollars to convert to Yen.
Body: This use of the AWT and Swing APIs within any kind of Enterprise JavaBean not only violates the restriction of the EJB specification against using AWT or Swing within an EJB but also violates the intended use of Enterprise JavaBeans to separate business logic from presentation logic.
@Stateless public class ConverterSessionBean extends Component implements KeyListener, ConverterSessionRemote { /* member variables for receiving keyboard input using AWT API */ ... private StringBuffer enteredText = new StringBuffer(); /* conversion rate on US dollars to Yen */ private BigDecimal yenRate = new BigDecimal("115.3100"); public ConverterSessionBean() { super(); /* method calls for setting up AWT Component for receiving keyboard input */ ... addKeyListener(this); } public BigDecimal dollarToYen(BigDecimal dollars) { BigDecimal result = dollars.multiply(yenRate); return result.setScale(2, BigDecimal.ROUND_DOWN); } /* member functions for implementing AWT KeyListener interface */ public void keyTyped(KeyEvent event) { ... } public void keyPressed(KeyEvent e) { } public void keyReleased(KeyEvent e) { } /* member functions for receiving keyboard input and displaying output */ public void paint(Graphics g) {...} ... }