How to Enable Remote Debugging for Java Applications?

How to Remotely Debug Java Applications?

Remote debugging of Java programs requires specific command-line options to enable the Java Virtual Machine (JVM) for remote access.

Command Line Options

Pre-Java 5.0:

• -Xdebug: Enables the debug mode.
• -Xrunjdwp: Specifies the settings for remote debugging.

Java 5.0 and Later:

• -agentlib:jdwp: A single option that combines the functionality of -Xdebug and -Xrunjdwp.

Option Parameters

• transport=dt_socket: Specifies the transport mechanism for remote debugging. Socket is recommended for debugging remote computers.
• address=8000: Sets the TCP/IP port for debugger connections. Default is local connections.
• suspend=y: Suspends program execution until a debugger is attached.
• suspend=n: Starts program execution immediately.

Usage

For pre-Java 5.0 versions:

java -Xdebug -Xrunjdwp

For Java 5.0 and later:

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8000

These options allow the JVM to accept remote debugging connections from a debugger tool, such as Visual Studio Code or IntelliJ IDEA. The debugger can then be used to set breakpoints, inspect variables, and step through the code execution remotely.

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