Why Doesn't My Remote Java Debugger Connect Despite Opening Port 4000?

Remote Debugging of Java Applications: Troubleshooting Connectivity Issues

Remote debugging allows developers to diagnose and troubleshoot Java applications running on remote machines. Despite following the correct steps, users may encounter difficulties establishing a connection between the debugger and the application.

The provided code snippet intends to launch a Java application in debug mode on a Linux machine, with the configuration:

java myapp -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=4000, suspend=n

The user has opened port 4000 on both Linux and Windows machines, but the debugger fails to connect.

The solution lies in the syntax of the -Xrunjdwp flag. The correct format is:

java -Xdebug -Xrunjdwp:server=y,transport=dt_socket,address=4000,suspend=n myapp

Key Differences:

• Option Order: Options must come before the class name (myapp). Any arguments after the class name are treated as application arguments.
• No Spaces in Flag: There should be no spaces within the -Xrunjdwp flag itself.

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