Attaching to a JVM Suspended on Start
The target JVM can be invoked and then suspended before executing the main()
function. The debugger can then attach
to the suspended target JVM. There are two
ways to attach the debugger to the target JVM: via shared memory or a network socket.
Shared Memory
Shared memory has the fastest debugging performance if it is supported by your
JVM platform. The debugger and the target JVM must be executing on the same computer.
The user-specified address parameter is optional -- if not specified, then the target JVM
will print out the shared memory address that it will use.
JDK 1.6
jdk1.6/bin/java -agentlib:jdwp=transport=dt_shmem,server=y,address=javadebug test.Test args
JDK 1.5
jdk1.5/bin/java -agentlib:jdwp=transport=dt_shmem,server=y,address=javadebug test.Test args
JDK 1.4
j2sdk1.4/bin/java -Xdebug -Xrunjdwp:transport=dt_shmem,server=y,address=javadebug test.Test args
JDK 1.3
jdk1.3/bin/java -classic -Xdebug -Xnoagent -Djava.compiler=NONE
-Xrunjdwp:transport=dt_shmem,server=y,address=javadebug test.Test args
Socket
A network socket can connect the debugger and the target JVM that can be running on
the same computer or on different computers.
The user-specified address (port number) parameter is optional --
if not specified, then the target JVM
will print out the port number that it will use.
JDK 1.6
jdk1.6/bin/java -agentlib:jdwp=transport=dt_socket,server=y,address=8000 test.Test args
JDK 1.5
jdk1.5/bin/java -agentlib:jdwp=transport=dt_socket,server=y,address=8000 test.Test args
JDK 1.4
j2sdk1.4/bin/java -Xdebug -Xrunjdwp:transport=dt_socket,server=y,address=8000 test.Test args
JDK 1.3
jdk1.3.x/bin/java -classic -Xdebug -Xnoagent -Djava.compiler=NONE
-Xrunjdwp:transport=dt_socket,server=y,address=8000 test.Test args
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