Java Reference
In-Depth Information
org.java8recipes.chapter11.recipe11_06.Recipe11_6.main(Recipe11_6.java:18)
Found 1 deadlock.
For this recipe to function properly on Windows, you must have as part of your
PATH environment variable the JDK's bin folder (For example C:\Program
Files\java\jdk1.8.0\bin ). If you have this path, you can run the tools such as
JStack and JPS. JStack comes pre-installed on OS X, so you should be able to run it out
of the box.
The JStack command uses as an argument -l (a dash and the letter L ), which spe-
cifies a Long listing (it does extra work to get more information about the threads run-
ning). The JStack also needs to know the PID of the target VM. A quick way to list all
running JVMs is to type JPS and press Enter. This will list the running VMs and their
PIDs. Figure 11-3 shows a screenshot of a JStack finding a deadlock in Recipe 11-6
from an OS X machine.
Figure 11-3 . JStack results
Note For the purposes of this example, j.u.c.l represents
java.util.concurrent.locks , and aqs represents AbstractQueuedSyn-
chronizer .
 
 
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