I am new to Quartz. I did manage to figure out that default value for Scheduler configuration is org.quartz.threadPool.threadCount=-1.
But it did not find anywhere what this implies. Does this mean that there will be only one thread or has it some other 'number'?
I am playing with quartz-scheduler v2.2.
It depends..
If you use Spring Framework then you can see that the real default is defined in SchedulerFactoryBean:
public static final int DEFAULT_THREAD_COUNT = 10; In case of using bare Quartz and and not passing any property, it will use its default configuration, which you can find it in org.quartz.properties:quartz jar. It's called quartz.properties (here's link) and contains:
# Default Properties file for use by StdSchedulerFactory # to create a Quartz Scheduler Instance, if a different # properties file is not explicitly specified. # org.quartz.scheduler.instanceName: DefaultQuartzScheduler org.quartz.scheduler.rmi.export: false org.quartz.scheduler.rmi.proxy: false org.quartz.scheduler.wrapJobExecutionInUserTransaction: false org.quartz.threadPool.class: org.quartz.simpl.SimpleThreadPool org.quartz.threadPool.threadCount: 10 org.quartz.threadPool.threadPriority: 5 org.quartz.threadPool.threadsInheritContextClassLoaderOfInitializingThread: true org.quartz.jobStore.misfireThreshold: 60000 org.quartz.jobStore.class: org.quartz.simpl.RAMJobStore So, it's 10 in the most cases.
On the other hand, if you just wanted to create SimpleThreadPool without specyfying thread-pool size, it will throw exception from initialize method as (here's link):
if (count <= 0) { throw new SchedulerConfigException( "Thread count must be > 0"); } Try to start Quartz with default value org.quartz.threadPool.threadCount=-1
It doesn't start. You got org.quartz.SchedulerConfigException: Thread count must be > 0
The default -1 value force you to config org.quartz.threadPool.threadCount to your value more then 0 .
From jdoc
org.quartz.threadPool.threadCount
Can be any positive integer...