How to Start a Java Server in Blocking Debug Mode and Connect Remotely via IDE
This guide explains how to launch a Java server in blocking debug mode using specific JVM options and then attach a remote debugger from an IDE, illustrated with command examples and screenshots of the connection setup.
To start a Java backend service in blocking debug mode, run the JVM with debugging options that open a JDWP socket and suspend the application until a debugger attaches.
Use the following command (replace xxx-api.jar with your actual JAR file):
java -Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,address=9999,server=y,suspend=y -jar xxx-api.jarAfter the JVM starts and waits, open your IDE (e.g., IntelliJ IDEA) and create a remote debugging configuration that connects to localhost:9999. The IDE will then attach to the running process.
The article includes screenshots showing the IDE remote connection dialog and the successful attachment.
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