[JIRA] [core] (JENKINS-17667) Unable to kill a job which is running

Mon, 07 Apr 2014 11:53:36 -0700

I am encountering this issue as well. There are many threads stuck on the line

at java.util.WeakHashMap.get(WeakHashMap.java:380)
	at hudson.tools.InstallerTranslator.getToolHome(InstallerTranslator.java:55)



The version of java I'm using:




java -version
java version "1.6.0_30"
OpenJDK Runtime Environment (IcedTea6 1.13.1) (6b30-1.13.1-1ubuntu2~0.12.04.1)
OpenJDK 64-Bit Server VM (build 23.25-b01, mixed mode)





Jenkins version:

Jenkins ver. 1.557



It seems as if the same WeakHashMap instance is being used by multiple threads, and since in the documentation for WeakHashMap it says 



http://docs.oracle.com/javase/7/docs/api/java/util/WeakHashMap.html




Like most collection classes, this class is not synchronized. A synchronized WeakHashMap may be constructed using the Collections.synchronizedMap method.





It seems like you should be using Collections.synchronizedMap on this or you should prboably use 

http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/cache/CacheBuilder.html

which allows for weak keys and is thread safe.
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