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https://issues.apache.org/jira/browse/KYLIN-5188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17544278#comment-17544278
 ] 

zhenkuan_zhang commented on KYLIN-5188:
---------------------------------------

When i set   “[email protected]” in 
kylin.properties, I didn't get the email either。
Show in the log:

ERROR [Scheduler 1984044036 Job 601efdaf-9343-4248-910a-6b1b5b6c414d-183] 
freemarker.runtime:60 : Error executing FreeMarker template
FreeMarker template error:
The following has evaluated to null or missing:
==> env_name  [in template "JOB_SUCCEED.ftl" at line 100, column 19]

----
Tip: If the failing expression is known to be legally refer to something that's 
sometimes null or missing, either specify a default value like 
myOptionalVar!myDefault, or use <#if 
myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the 
last step of the expression; to cover the whole expression, use parenthesis: 
(myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----

----
FTL stack trace ("~" means nesting-related):
        - Failed at: ${env_name}  [in template "JOB_SUCCEED.ftl" at line 100, 
column 17]
----

Java stack trace (for programmers):
----
freemarker.core.InvalidReferenceException: [... Exception message was already 
printed; see it above ...]
        at 
freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:131)
        at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:355)
        at freemarker.core.Expression.evalAndCoerceToString(Expression.java:82)
        at freemarker.core.DollarVariable.accept(DollarVariable.java:41)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.MixedContent.accept(MixedContent.java:54)
        at freemarker.core.Environment.visit(Environment.java:324)
        at freemarker.core.Environment.process(Environment.java:302)
        at freemarker.template.Template.process(Template.java:325)
        at 
org.apache.kylin.common.util.MailTemplateProvider.buildMailContent(MailTemplateProvider.java:63)
        at 
org.apache.kylin.job.util.MailNotificationUtil.getMailContent(MailNotificationUtil.java:70)
        at 
org.apache.kylin.engine.mr.CubingJob.formatNotifications(CubingJob.java:251)
        at 
org.apache.kylin.job.execution.AbstractExecutable.notifyUserStatusChange(AbstractExecutable.java:368)
        at 
org.apache.kylin.job.execution.DefaultChainedExecutable.onStatusChange(DefaultChainedExecutable.java:179)
        at 
org.apache.kylin.engine.mr.CubingJob.onStatusChange(CubingJob.java:280)
        at 
org.apache.kylin.job.execution.DefaultChainedExecutable.onExecuteFinished(DefaultChainedExecutable.java:160)
        at 
org.apache.kylin.engine.mr.CubingJob.onExecuteFinished(CubingJob.java:276)
        at 
org.apache.kylin.job.execution.AbstractExecutable.onExecuteFinishedWithRetry(AbstractExecutable.java:138)
        at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:228)
        at 
org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:113)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
2022-05-31 17:50:35,060 ERROR [Scheduler 1984044036 Job 
601efdaf-9343-4248-910a-6b1b5b6c414d-183] execution.AbstractExecutable:371 : 
error send email
java.lang.NullPointerException
        at 
org.apache.kylin.shaded.com.google.common.base.Preconditions.checkNotNull(Preconditions.java:878)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.toString(Joiner.java:452)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.appendTo(Joiner.java:109)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.appendTo(Joiner.java:152)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.join(Joiner.java:195)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.join(Joiner.java:185)
        at 
org.apache.kylin.shaded.com.google.common.base.Joiner.join(Joiner.java:203)
        at 
org.apache.kylin.job.util.MailNotificationUtil.getMailTitle(MailNotificationUtil.java:79)
        at 
org.apache.kylin.engine.mr.CubingJob.formatNotifications(CubingJob.java:252)
        at 
org.apache.kylin.job.execution.AbstractExecutable.notifyUserStatusChange(AbstractExecutable.java:368)
        at 
org.apache.kylin.job.execution.DefaultChainedExecutable.onStatusChange(DefaultChainedExecutable.java:179)
        at 
org.apache.kylin.engine.mr.CubingJob.onStatusChange(CubingJob.java:280)
        at 
org.apache.kylin.job.execution.DefaultChainedExecutable.onExecuteFinished(DefaultChainedExecutable.java:160)
        at 
org.apache.kylin.engine.mr.CubingJob.onExecuteFinished(CubingJob.java:276)
        at 
org.apache.kylin.job.execution.AbstractExecutable.onExecuteFinishedWithRetry(AbstractExecutable.java:138)
        at 
org.apache.kylin.job.execution.AbstractExecutable.execute(AbstractExecutable.java:228)
        at 
org.apache.kylin.job.impl.threadpool.DefaultScheduler$JobRunner.run(DefaultScheduler.java:113)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)


> No need to send email,user list is empty
> ----------------------------------------
>
>                 Key: KYLIN-5188
>                 URL: https://issues.apache.org/jira/browse/KYLIN-5188
>             Project: Kylin
>          Issue Type: Bug
>          Components: Others
>    Affects Versions: v4.0.1
>            Reporter: zhenkuan_zhang
>            Priority: Major
>
> Hello,When I modified the kylin.properties to add the configuration about 
> sending emails。I didn't receive the email。show in the log:
> *DEBUG [Scheduler 1984044036 Job e0dc84df-e1bd-446a-bcfe-e3e47a795701-106] 
> execution.AbstractExecutable:365 : no need to send email,user list is empty*
> This is my cube configuration:
> Notification Email List ["[email protected]","[email protected]"]
> Notification Events  ["ERROR","SUCCEED","DISCARDED"]



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