Thanks  Emmanuel.
The document you pointed is very good. It solved my problem. 
For the people who are facing similar issues, I would like to tell my 
experience.First I tried list jars which do not need to scan. The situation did 
not improve much (maybe my app is small). Then I tried entropy. It 
significantly improved. Problem solved.
    On Tuesday, July 2, 2019, 04:33:31 PM PDT, Emmanuel Bourg 
<ebo...@apache.org> wrote:  
 
 Le 03/07/2019 à 01:23, W a écrit :
>  Hi,I have Tomcat 9 on Ubuntu 18.04. Tomcat stars very slow, sometimes 15 
>minute.
> I checked catalina.2019-xxx.log and found some issues below.
> What should I do?
> Any information would be appreciated. Thanks in advance.

Your server lacks entropy, see:

https://cwiki.apache.org/confluence/display/TOMCAT/HowTo+FasterStartUp#HowToFasterStartUp-EntropySource

Emmanuel Bourg

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