NonStop Server for Java 4.2 Tools Reference

-X option

Sets a nonstandard target VM option.

Connecting for Remote Debugging

The Debugger launches the target Java VM.

-launch

jdb -launch ClassName

The Debugger attaches to a previously running Java VM.

-attach

jdb -attach hostname:portnum

For this command, the JVM must already be running as a server at <hostname:portnum>

To start the server, use the following command :

java -Xnoagent -Xdebug -Djava.complier=NONE \

-Xrunjdwp:transport=dt_socket,\

address=hostname:portnum,server=y ClassName

Note: If address option is not given, the server will start on any available port on the

local host and print portnum. This portnum should be used by the jdb to attach.

ii.

The target JVM attaches to previously running debugger.

-listen

jdb -listen hostname:portnum

To attach a target JVM, use the following command :

java -Xnoagent -Xdebug -Djava.complier=NONE \

-Xrunjdwp:transport=dt_socket,\

address=hostname:portnum ClassName

Note: You must give the address parameter because the debugger listens at this

address.

iii.

The Debugger selects a connector.

-connect

jdb -connect option

Note: Only the com.sun.jdi.SocketListen option is supported.

The target Java VM can then attach as:

iv.