mysql 5.7 problem with confluence 6.15 and ubuntu 18.04 problem

[EdisonCh]

 Dear all,

I have tried to install confluence 6.15.3 on Ubuntu 18.04 using fresh install mysql 5.7 and it failed Gateway Timeout with the error messages below.

I have follow all the instruction (read/write permission for confluence user) and the setting of database mysql step-by-step and I have passed the Test Connection in setting of database page. However after I pressed Next, the clock would spin then after awhile Gateway Time out. I check catalina.out file to see what happens. Here is the brief error:

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01-May-2019 12:05:52.644 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in [14,412] milliseconds
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
01-May-2019 12:45:02.870 WARNING [Catalina-utility-2] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadDetected Thread [http-nio-9777-exec-6] (id=[70]) has been active for [69,115] milliseconds (since [5/1/19 12:43 PM]) to serve the same request for [http://geminiwest:9777/confluence/setup/setupdbtype.action] and may be stuck (configured threshold for this StuckThreadDetectionValve is [60] seconds). There is/are [1] thread(s) in total that are monitored by this Valve and may be stuck.
java.lang.Throwable
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:225)
at java.util.zip.ZipFile.<init>(ZipFile.java:155)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:130)
at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:164)
at org.apache.tomcat.util.compat.JreCompat.jarFileNewInstance(JreCompat.java:149)
at org.apache.catalina.webresources.AbstractArchiveResourceSet.openJarFile(AbstractArchiveResourceSet.java:307)
at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.getArchiveEntry(AbstractSingleArchiveResourceSet.java:97)
at org.apache.catalina.webresources.AbstractArchiveResourceSet.getResource(AbstractArchiveResourceSet.java:256)
at org.apache.catalina.webresources.StandardRoot.getResourceInternal(StandardRoot.java:281)
at org.apache.catalina.webresources.CachedResource.validateResource(CachedResource.java:87)
at org.apache.catalina.webresources.Cache.getResource(Cache.java:87)

01-May-2019 12:45:52.896 WARNING [Catalina-utility-4] org.apache.catalina.valves.StuckThreadDetectionValve.notifyStuckThreadCompleted Thread [http-nio-9777-exec-6] (id=[70]) was previously reported to be stuck but has completed. It was active for approximately [111,386] milliseconds.

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Any clue to help me out?

I have tried postgresql 10 with confluence 6.15.3 with the same errors.

I am out of idea right now.

[EdisonCh · Accepted solution]

Already answer in 

https://community.atlassian.com/t5/Confluence-questions/Ubuntu-18-04-Confluence-6-15-3-setup-db-problem/qaq-p/1071708