--%>
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 : Program is prone to deadlock when

      Give a brief introduction about the operation of your program and show that you understand the idea behind threads and mutual exclusion variable. Why do we need to use mutual exclusion to control the access of the three global variables? What is the potential p

    		•
  • Q : What is Binary operator Binary operator

    Binary operator: It is an operator taking two operands. Java has numerous binary operators, like the arithmetic operators +, -, *, / and %, and the Boolean operators &&, || and ^, among others.

    		•
  • Q : What does compatibility testing include

    What does compatibility testing include and who will perform the testing?

    		•
  • Q : Define Byte Byte : In general

    Byte: In general computing, it refers to eight bits of data. In Java it is as well the name of one of the primitive data types, whose size is of eight bits.

    		•
  • Q : Define Daemon thread Daemon thread :

    Daemon thread: The daemon threads are non-user threads. They are usually employed to carry out low-priority tasks which must not take priority over the major task of the program. They can be employed to do helpful work whenever all other user threads

    		•
  • Q : Throughout system testing the

    Someone complains that throughout system testing the application frequently crashes. What probable process problem does which indicate?

    		•
  • Q : Explain Do loop Do loop : This is one

    Do loop: This is one of Java's three control structures employed for looping. The other two are the for loop and while loop. A do loop comprises of a loop body and a Boolean expression. The condition is tested subsequent to the loop body has been fini

    		•
  • Q : What is an Arithmetic expression

    Expression: It is a combination of operands and operators which generates a resultant value. Expressions contain a resulting type that affects the context in which they might be employed.

    		•
  • Q : Determine incorrect tags in HTML What

    What is incorrect with my < br > Tags?

    		•
  • Q : Define the term Local inner class and

    Define the term Local inner class and Local variable: Local inner class: It is an inner class stated in a method. Local variable: It is a variable defined within

    		•