Applet security issues

• To prevent applets from damaging a client system or from making it possible to damage a client system, security restrictions limit what an applet can do.
• To overcome these security restrictions, you can create a signed applet. This indicates that the applet comes from a trusted source. Then, you can add rights to the signed applet.

What an applet can't do

• Read, write, or delete files or databases on the client system.
• Access information about the files or databases on the client system.
• Run programs on the client system.
• Access system properties for the client system except the Java version, the name and version of the operating system, and the characters used to separate directories, paths, and lines.
• Make network connections to other servers available to the client system.

What an applet can do

• Display user interface components and graphics.
• Send keystrokes and mouse clicks back to the applet's server.
• Make network connections to the applet's server.
• Call public methods from other applets on the same web page.