--%>
Assignment Help - homework help

Property Specifications of Java Pathfinder

Property Specifications: The most straightforward way to specify and check simple safety properties in JPF is to use Java assertions inside the application under analysis. This allows the specification of properties that only depend on the application data values (e.g., parameter value intervals). Violations are caught by JPF. The drawbacks of this method are that it requires access to the application sources, and that it can significantly increase the state space if the property requires evaluation state itself (e.g., for properties implemented as automatons).

The other way to specify properties is by using gov.nasa.jpf.Property or gov.nasa.jpf.GenericProperty instances to encapsulate property checks.

50_property spec.jpg

The user typically creates an instance of such a class and provides an implementation for its check() method which does the main work for checking the property. The check()method is evaluated after each transition. If it returns false and termination has been requested, the search process ends, and all violated properties are printed (which potentially includes error traces).

JPF comes with generic Property classes for the following properties:

  • No Deadlocks
  • No Assertion Violation
  • No Uncaught Exceptions (i.e., not handled inside the application)

   Related Questions in Programming Languages

  • Q : What is Primitive Type Casting

    Primitive Type Casting: C/C++ allows you to cast between totally unrelated types. This can be problematic for model checking. Avoid type casting between unrelated types and in particular primitive types. For example,

    Q : Describe IEEE 754 IEEE 754 : The

    IEEE 754: The standard 754-1985 issued by Institute of Electrical and Electronic Engineers for the binary floating point arithmetic. It is the standard to which Java's arithmetic matches.

    		•
  • Q : What is Low level programming languages

    Low level programming languages: It is frequently termed as `assembly languages’; these give little more than the fundamental instruction set of a particular Central Processing Unit. Therefore programs written in low level programming languages

    		•
  • Q : How authorities save their Private Keys

    How do certifying authorities save their Private Keys?

    		•
  • Q : What do you mean by java Swing What do

    What do you mean by the term java Swing? Describe in brief.

    		•
  • Q : Explain the way to create a Mutex

    Explain the way to create a Mutex.

    		•
  • Q : Chown Explain the chown, chmod and

    Explain the chown, chmod and chgrp?

    		•
  • Q : Define Property Specifications Property

    Property Specifications: Users can specify assertions using the assert(expr) statements. An assert statement is used to check if the property specified by the expression expr is valid within a state. If expr evaluates to 0, this implies that it is not

    		•
  • Q : What is Signal Handler Signal Handlers:

    Signal Handlers: In some operating systems, signal handlers are executed on a thread stack; they “overlay” the current thread execution (which may be used, for example, in combination with setjmp/longjmp to create user-domain lightweight t

    		•
  • Q : Describe Software reuse Software reuse

    Software reuse: It is the ability to reuse software components in various contexts. The object-oriented languages aid to encourage reuse by their support of encapsulation.

    		•