启动tomcat服务器出现的问题内存溢出

[qq_晨昱]

告: The web application [bulletin] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
十月 24, 2017 3:55:06 下午 org.apache.catalina.loader.WebappClassLoaderBase clearReferencesThreads
警告: The web application [bulletin] 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(Native Method)
java.lang.ref.ReferenceQueue.remove(Unknown Source)
com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
十月 24, 2017 3:55:06 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-nio-8080"]
十月 24, 2017 3:55:06 下午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-nio-8009"]
十月 24, 2017 3:55:06 下午 org.apache.catalina.startup.Catalina start
信息: Server startup in 12294 ms


启动tomcat服务器出现这种异常如何解决

[weixin_38269856]

JAVA_OPTS='-Xms2048m -Xmx2048m -XX:PermSize=256M'