No way to easily figure out where a thread pool configuration is missing

[henri-tremblay]

As soon as you have no default thread pool, you need to specify it everywhere. So far, so good.

However, when one is missing, the exception doesn't really obviously say where. Here is an example that will fail. Uncomment event-dispatch to make it work. You will see that the exception is far from being useful.

Also, the documentation on thread pools seems to be missing.

<config xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
           xmlns='http://www.ehcache.org/v3'
           xsi:schemaLocation="http://www.ehcache.org/v3
  http://www.ehcache.org/schema/ehcache-core-3.0.xsd">
    
    <thread-pools>
        <thread-pool alias="defaultDiskPool" min-size="1" max-size="3"/>
    </thread-pools>

    <!--<event-dispatch thread-pool="defaultDiskPool"/>-->

    <cache-template name="default">
        <key-type>java.lang.String</key-type>
        <value-type>java.lang.String</value-type>
        <heap unit="entries">1</heap>
    </cache-template>

    <cache alias="cache" uses-template="default"/>
</config>