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(JDB) Java debugger is a command line Java debugging tool used to debug Java programs without the requirement of inserting specific debugging instructions into the code.
These are some advantages of Java Debugger: -
These are some commonly generate bugs: -
Syntactic or Compilation errors - These errors are generally generated due to some typing mistakes.
Run-time errors - These errors are generated at execution time generally due to exceptions.
Threading errors - These errors are difficult to replicate and track down.
Various types of approaches used for debugging are: -
There are various ways to connect JDBC with JAVA but the simplest one is to provide the following command at the runtime of your main class:-
>jdbc Main Class
Java debugger interacts with the Java runtime interpreter to interrupt the normal flow of program. Thus, Java interpreter provides support to debugger.
The following syntax is required to invoke debugger: -
jdb [options] [classname] [arguments]
To debug an applet we have to execute the debugger within applet viewer by the help of following command: -
>appletviewer -debug URL
To start the execution of main class you just need to execute the below command: -
>run [class [args]]
It is optional to mention the name of specific class and argument.
Use the following command to complete the partial execution of program: -
The print command is used to display the value of expressions whereas dump command is used to display the information of objects.
Breakpoints are used in debugging to pause or stop the execution of a program at a specific line of code and test whether the program is functioning correctly or not.
A breakpoint can be set either on the basis of method name or specific number of line.
To set a breakpoint on method, the following syntax is used: -
stop in Classname.MethodName
To set a breakpoint on specific line, the following syntax is used: -
stop at Classname:LineNumber
These are the following techniques of stepping: -
In JDB, Stepping is a procedure to execute the code line by line. Thus, through this approach each line of the code can be examined properly.
Yes, Java debugger is capable of handling runtime exceptions. To handle these exceptions it provides catch command.
A debugger is a computer program used to identify and remove errors from other programs.
The Java Debugger (JDB) Related Tutorials
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The Java Debugger (JDB) Related Interview Questions
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