How Can I Remotely Debug Java Programs Using Command-Line Options?

Java Command-Line Options for Remote Debugging

Java provides options to enable remote debugging of Java programs through the Java Virtual Machine (JVM). To remotely debug, specific command-line options need to be set.

Command-Line Options Before Java 5.0

Prior to Java 5.0, two options were used:

• -Xdebug: Enables remote debugging.
• -Xrunjdwp: Specifies additional debugging parameters.

Command-Line Options from Java 5.0

From Java 5.0 onwards, it's recommended to use the following single option:

• -agentlib:jdwp: Sets debugging parameters for the Java Debug Wire Protocol (JDWP).

-agentlib:jdwp Options

The options for -agentlib:jdwp are as follows:

• transport=dt_socket: Enables socket communication, allowing for remote debugging.
• address=1044: Specifies the TCP/IP port for debugger connection.
• suspend=n: Starts program execution immediately (rather than waiting for debugger attachment).

Example

To remotely debug a Java program running on a distant computer:

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

• transport=dt_socket,server=y: Allows remote socket connections.
• suspend=n: Starts execution immediately.
• address=8000: Specifies the port to listen on for debugger connection.

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