0004889: Static calls to Alarm create Threads

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Category

Severity

Reproducibility

Date Submitted

Last Update

0004889

[Resin]

minor

always

12-02-11 12:08

02-21-12 16:55

Reporter

cowan

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

4.0.24

Summary

0004889: Static calls to Alarm create Threads

Description

The AlarmClock created in Alarm as a static class declaration calls ThreadPool.getThreadPool which spawns new threads. It seems unnecessary to spawn threads unless they are really needed, particularly simply upon class initialization.

This causes issues running on Google App Engine, because their sandbox does not permit thread creation.

This results in GoogleQuercusServlet failing to serve PHP because PageManager calls Alarm.isActive.

WARNING: Nested in java.lang.ExceptionInInitializerError:
java.security.AccessControlException: access denied (java.lang.RuntimePermission modifyThreadGroup)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
    at java.security.AccessController.checkPermission(AccessController.java:546)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkPermission(DevAppServerFactory.java:166)
    at com.google.appengine.tools.development.DevAppServerFactory$CustomSecurityManager.checkAccess(DevAppServerFactory.java:191)
    at java.lang.ThreadGroup.checkAccess(ThreadGroup.java:299)
    at java.lang.Thread.init(Thread.java:336)
    at java.lang.Thread.<init>(Thread.java:436)
    at com.caucho.env.thread.ThreadLauncher.startWorkerThread(ThreadLauncher.java:125)
    at com.caucho.env.thread.AbstractTaskWorker.wake(AbstractTaskWorker.java:118)
    at com.caucho.env.thread.AbstractThreadLauncher.update(AbstractThreadLauncher.java:453)
    at com.caucho.env.thread.ThreadLauncher.setPriorityIdleMin(ThreadLauncher.java:74)
    at com.caucho.env.thread.ThreadLauncher.<init>(ThreadLauncher.java:64)
    at com.caucho.env.thread.ThreadPool.<init>(ThreadPool.java:136)
    at com.caucho.env.thread.ThreadPool.<init>(ThreadPool.java:129)
    at com.caucho.env.thread.ThreadPool.getThreadPool(ThreadPool.java:156)
    at com.caucho.util.AlarmClock.<init>(AlarmClock.java:65)
    at com.caucho.util.Alarm.<clinit>(Alarm.java:68)

Additional Information

Rep by M. Frank

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Issue History
Date Modified	Username	Field	Change
12-02-11 12:08	cowan	New Issue
02-21-12 16:55	ferg	Assigned To	=> ferg
02-21-12 16:55	ferg	Status	new => closed
02-21-12 16:55	ferg	Resolution	open => fixed
02-21-12 16:55	ferg	Fixed in Version	=> 4.0.26

Mantis 1.0.0rc3[^]

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