Menu
Normally to attach a debuger to a running jvm you would need start the jvm with arguments such as the following:
> java -Xdebug -Xrunjdwp:transport=dt_socket,address=1000,server=y,suspend=n Now if I want to debug a process that wasn't started in debug mode, what can I do?
This situation arrises when a production system (i.e. started without debug args) exhibits a 'random' (I use the term loosely) bug. So I can't restart the jvm with the appropriate arguments, because nobody knows how to reproduce the bug again. Is it impossible to attach to the JVM in this situation?
Just to clarify it is not possible to use tools like jdb to attach to already running JVMs unless they were started in debug mode
from the JVM man page
Another way to use jdb is by attaching it to a Java VM that is already running. A VM that is to be debugged with jdb must be started with the following options:
841
A Java program can be debugged simply by right clicking on the Java editor class file from Package explorer. Select Debug As → Java Application or use the shortcut Alt + Shift + D, J instead. Either actions mentioned above creates a new Debug Launch Configuration and uses it to start the Java application.
Remote Java Debugging is the process of debugging a Java program or application running on another machine or a server environment.
The Java Debugger (jdb) is a simple command-line debugger provided by Oracle. It's the equivalent of the GNU Debugger (gdb) for the Java Virtual Machine. The Java Debugger is included in the Java SE Development Kit, so if you have JDK installed on your machine, you don't need to do anything else.
Run the program in debug modeClick the Run icon in the gutter, then select Modify Run Configuration. Enter arguments in the Program arguments field. Click the Run button near the main method. From the menu, select Debug.
You may be able to use jsadebugd (JDK) to attach a debug server to the process (available on Windows with the Debugging Tools for Windows). It is marked as experimental, so you may want to try it out on a test machine first.
Usage:
jsadebugd <pid> jdb -connect sun.jvm.hotspot.jdi.SADebugServerAttachingConnector:debugServerName=localhost The connector name withe arg can be found using jdb -listconnectors.
64
Just to clarify it is not possible to use tools like jdb to attach to already running JVMs > > unless they were started in debug mode
in soviet russia source reads you
jdb -connect sun.jvm.hotspot.jdi.SAPIDAttachingConnector:pid=9426 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
