What is JNI and its advantages and disadvantages ?

JNI (Java Native Interface)

JNI is used to call functions written in other languages than Java.

Advantages

• Use existing libraries which was written in other language
• Call Windows API function
• Maintains execution speed
• Call API function of some server product which is in C or C++ from Java client.

Disadvantage

• Can't say write once run anywhere
• Difficult to debug runtime error in native code
• Potential security risk
• Can't call it from an Applet