--%>
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 Catch clause Catch clause : It

    Catch clause: It is a part of a try statement accountable for handling the caught exception.

    		•
  • Q : Explain the role XSL that dynamically

    Explain the role which XSL can play while dynamically generating HTML pages by a relational database?

    		•
  • Q : State the term Standard Generalized

    State the term Standard Generalized Markup Language?

    		•
  • Q : Property Specifications of Java

    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

    		•
  • Q : Explain Decrement operator Decrement

    Decrement operator: It is an operator (--) which adds one to its operand. This has two forms: pre-decrement (--x) and post-decrement (x--). In its pre-decrement form, the outcome of the expression is the value of its argument subsequent to the decreme

    		•
  • Q : Write a recursive function intpower(base

    Write a recursive function intpower(base, exponent) that when invoked returns base^exponent. For example, intpower(3,4) = 3*3*3*3. Assume that the exponent is an integer greater than or equal to 1.

  • Q : Define the term Catching exceptions

    Catching exceptions: Exceptions are caught in the catch clause of the try statement. Catching an exception provides the program a chance to recover from the trouble or attempt a repair for whatsoever caused it.

    		•
  • Q : Generating uniform random numbers using

    In .NET, write a simple web service in C# to generate uniform random numbers. Use the class System.Random to generate the random numbers. What part of the code is specifically associated with web services? How could you deploy the web service?

    		•
  • Q : Define Java virtual machine or JVM

    Define Java virtual machine (JVM): A Java Virtual Machine (JVM) is an abstract computing machine, or virtual machine (set of computer software programs and data structures) which is a platform-independent execution environment that converts Java bytec

    		•
  • Q : Define Little-endian Little-endian : It

    Little-endian: It is a common difference among machines is the order in which they store up the individual bytes of multi-byte numerical data. The little-endian machine stores the lower-order bytes prior to the higher-order bytes.

    		•