Why is an inexplicable error always reported when the project is started for a java-Java framework SSH integrated project?

Unabletoloadconfiguration. java framework mysqljava ssh database connection pool

Unable to load configuration.-[unknown location]

Caused by: Unable to load configuration.-[unknown location]

Caused by: Unable to load jar: file:/D:/mars-workspace /. metadata /. plugins/org. eclipse. wst. server. core/tmp0/wtpwebapps/vvvvvvvvv/WEB-INF/lib/struts2-spring-plugin-2.3.15.3.jar! /Struts-plugin.xml-[unknown location]

Caused by: Connection timed out: connect-[unknown location]

Caused by: java.net. ConnectException: Connection timed out: connect

Personal analysis should not be a jar package conflict problem, because the project can run normally before, and this problem occurs once before, but after two days, you can run it again .... Now, this problem occurs again. some people on Baidu say that the query cannot be queried because of too many queries, but as shown in the code, whether in the junit test class or after the spring container initialization is completed, you can use the listener to immediately query all permissions and access the database normally. Therefore, this is not the reason for the c3p0 database connection pool, I don't know what the problem is .. Please advise.