'jdb' - Java Debugger Command and Options

This section describes the Java debugging tool 'jdb' and its commonly used command options.

"jdb": A command line tool that allows you to debug a Java application interactively with in a command line mode. "javac" is distributed as part of the Sun JDK package. It has the following syntax:

jdb [options] main_class_name
jdb [options] -attach <address> 

where "options" is a list of options, "main_class_name" is a the name of the main class of a Java application, and "address" is the debugging connection address of a running Java application.

As you can see from the syntax, there are two ways of running "jdb":

1. Running "jdb" to launch a Java application and start a debug session on that application.

2. Running "jdb" to connect to a separately launched Java application and start a debug session on that application.

Commonly used options are:

Note that in order to use all debugging commands, the target application must be compiled with "-g" option, which will generate all debugging information, including source file, line number, and local variables, into the class file.

Last update: 2015.

Table of Contents

 About This Book

 Java Tools Terminology

 Installing Java 8 on Windows

 'javac' - The Java Program Compiler

 'java' - The Java Program Launcher

'jdb' - The Java Debugger

'jdb' - Java Debugger Command and Options

 Starting a Debugging Session with 'jdb'

 Debugging Applications with Separate 'jdb' Sessions

 Debugging Java Applications Remotely

 Listing Debugging Commands with 'help' Command

 PrimeNumberSeeker.java - Multi-Thread Sample Program

 Starting Debugging Session on a Multi-Thread Application

 Stepping through Statements of a Child Thread

 Checking Variable Values in a Debugging Session

 Debugging the Main Thread of a Multi-Thread Application

 Switching Execution Threads in a Debugging Session

 Suspending Main Thread to Debug Child Thread

 'jconsole' - Java Monitoring and Management Console

 'jstat' - JVM Statistics Monitoring Tool

 JVM Troubleshooting Tools

 jvisualvm (Java VisualVM) - JVM Visual Tool

 'jar' - The JAR File Tool

 'javap' - The Java Class File Disassembler

 'keytool' - Public Key Certificate Tool

 'native2ascii' - Native-to-ASCII Encoding Converter

 Outdated Tutorials


 PDF Printing Version