求大神解决问题！！！！SSH框架Tomcat服务器启动报错

web应用程序(合同)似乎已经开始一个线程命名(废弃的连接清理线程),但未能阻止它。这很有可能创建一个内存泄漏。线程的堆栈跟踪:

The web application [Contract] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
java.lang.Object.wait(本地方法)
java.lang.ref.ReferenceQueue.remove (ReferenceQueue.java: 143)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run (AbandonedConnectionCleanupThread.java: 43)