Hi.
Does anyone know if JRE (not JDK) has diagnostics tools, such as jps, jstack, jhat and so on?
Or these tools only present in JDK?
Thanks.
+2
A:
These files are all you have in the jre (jre1.6.0_20 linux):
rwxrwxrwx 1 bob bob 10 2010-05-12 19:40 ControlPanel -> ./jcontrol
-rwxr-xr-x 1 bob bob 47308 2010-04-12 22:36 java
-rwxr-xr-x 1 bob bob 25634 2010-04-12 22:39 java_vm
-rwxr-xr-x 1 bob bob 84970 2010-04-12 22:39 javaws
-rwxr-xr-x 1 bob bob 6347 2010-04-12 22:39 jcontrol
-rwxr-xr-x 1 bob bob 47447 2010-04-12 22:36 keytool
-rwxr-xr-x 1 bob bob 47679 2010-04-12 22:36 orbd
-rwxr-xr-x 1 bob bob 47515 2010-04-12 22:36 pack200
-rwxr-xr-x 1 bob bob 47807 2010-04-12 22:36 policytool
-rwxr-xr-x 1 bob bob 47447 2010-04-12 22:36 rmid
-rwxr-xr-x 1 bob bob 47447 2010-04-12 22:36 rmiregistry
-rwxr-xr-x 1 bob bob 47475 2010-04-12 22:36 servertool
-rwxr-xr-x 1 bob bob 47679 2010-04-12 22:36 tnameserv
-rwxr-xr-x 1 bob bob 189274 2010-04-12 22:36 unpack200
So, the answer is that they are only present in the JDK.
davey
2010-05-12 18:44:09
So this means I need to install them on every server...Or maybe there is another way to get diagnostic info locally?
SyBer
2010-05-12 20:25:47
You can get the stack trace with kill -QUIT <PID>. and you can start the jvm with JMX: ``/jre1.6.0_20/bin/java -Dcom.sun.management.jmxremote -jar jpws-0-5-0.jar``As long as you do that and enable it to be managed from another machine then no you would not need to put the JDK on every machine.
davey
2010-05-13 07:43:58
You can start the jvm with JMX: ``/jre1.6.0_20/bin/java -Dcom.sun.management.jmxremote -jar jpws-0-5-0.jar``As long as you do that and enable it to be managed from another machine then no you would not need to put the JDK on every machine
davey
2010-05-13 07:45:31
Thanks, makes sense.
SyBer
2010-05-14 14:38:47