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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