--%>
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 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 : 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.

    		•
  • Q : Explain If statement If statement : A

    If statement: A control structure employed to select between performing or not performing additional actions.     if(boolean-expression){        // Statements

    		•
  • Q : Define the term core validation Define

    Define the term core validation?

    		•
  • Q : Use of XMLHttpRequest object in AJAX

    What is the use of XMLHttpRequest object in AJAX?

    		•
  • Q : Program and process Explain the term

    Explain the term program and process?

    		•
  • Q : Define the Binding of Instructions and

    Define the Binding of Instructions and Data to Memory?

    		•
  • Q : Define Short-circuit operator

    Short-circuit operator: It is an operator in which only as a lot of operands are computed as are required to determine the final outcome of the operation. The logical-and (&&) and logical-or (||) operators are most general illustration, though

    		•
  • Q : What is Common Gateway Interface Common

    Common Gateway Interface: The Common Gateway Interface (abbreviated as CGI) is a standard which permits Web clients to interact with programs on Web server. The CGI script is on the server and is able to process arguments or input from a client, and r

    		•
  • Q : Define Applet Applet : The Applets are

    Applet: The Applets are Java programs based on the Applet or JApplet classes. They are closely related with the capability to give active content within the Web pages. They have numerous features that differentiate them from ordinary Java graphical ap

    		•