crowd setup(CentOS 7)-Database configuration error

[qiyuanlj]

Database configuration

when I choose "Embedded" and click "continue", it says as follows:

The following required plugins are not available: [Atlassian OAuth Consumer Plugin, Applinks - Plugin - Core, Atlassian Crowd Synchronisation Feedback, Atlassian LESS Transformer Plugin, Atlassian OAuth Service Provider SAL SPI Implementation, Atlassian Crowd Frontend Plugin, Atlassian REST - Module Types, Crowd REST API, Crowd REST API - Application Management, Crowd SAL, Crowd Monitoring Plugin, jquery, Atlassian Plugins - Web Resources - Implementation Plugin, Atlassian UI Plugin, Atlassian Plugins - Web Resources REST, Atlassian Template Renderer API, Atlassian Template Renderer Velocity 1.6 Plugin, Crowd REST Admin API, Atlassian Soy - Plugin, Atlassian OAuth Consumer SAL SPI Implementation, Applinks - Plugin - OAuth, Atlassian OAuth Service Provider Plugin]. See Crowd server logs for details. The setup process cannot continue until the problem has been solved. If you require further assistance, you can contact Atlassian support.

[Nic Brough -Adaptavist-]

What do the logs say the problem is?  They will contain more detailed errors, or a timeout message when trying to load the plugins.

The usual culprits are incorrect file permissions (look at the user running Crowd and the ownership of all the files in the install), the wrong version of Java in use, and not enough resources being granted (usually too small a Java heap size)