When we need debug on remove server directly, we need use JDWP - Java Debug Wire Protocol

At Remote Side

Start SpringBoot application with following parameters, port 8001 can be changed:

Java 5-8:

java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8001 -jar sprint-boot-app.jar

Java 9 - later:

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8001 -jar sprint-boot-app.jar

If When using Dockerfile:

EXPOSE 8080 8001
ENV JAVA_TOOL_OPTIONS='-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=*:8001'
ENTRYPOINT ["java", "-jar", "sprint-boot-app.jar"]

At Intellij Side

Open Run/Debug Configurations, create a new Configuration with following arguments:

agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=8001

• Port number should be the same as we specified at remote side.
• Java 5-8: address=8001
• Java 9-x: address=*:8001