Java

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When you enable debugging, you enable both local and remote debugging.

The Java Platform Debugger Architecture (JPDA) is the architecture designed for use by debuggers and debugger-like tools. It consists of two programming interfaces and a wire protocol.

Articles Related

Jdb

The jdb utility is included in the JDK release as the example command-line debugger. The jdb command demonstrates the Java Platform Debugger Architecture (JDBA)

Jdb doc

Connect the debugger to a JVM

There is a lot of way to connect the debugger to the JVM.

loading in-process debugging libraries and specifiing the kind of connection to be made.

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n MyClass

where:

suspend=y/n , controls whether the JVM should wait for the debugger to attach before starting up.

Attach

attaching the jdb command to the JVM:

jdb -attach 8000

Client

Intellij

https://www.jetbrains.com/idea/help/run-debug-configuration-remote.html

run > edit configurations > + > remote

Server

Maven

Maven 2.0.8 or newer: run the “mvnDebug” command in place of “mvn”
Maven <2.0.8: uncomment the following mvn.bat line

@REM set MAVEN_OPTS=-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000

See Maven: Enable remote debugging command line option

X options are options of the JRockit JVM.

Jdwp

Java Debug Wire Protocol (JDWP) defines the format of information and requests transferred between the debuggee process and the debugger front-end.