To prevent a memory leak, the JDBC Driver have been forcibly unregistered.

1. Error description

Critical: The Web application [/amst] registered the JDBC driver [Org.logicalcobwebs.proxool.ProxoolDriver] but failed to Unregi Ster it when the Web application was stopped. To prevent a memory leak, the JDBC Driver have been forcibly unregistered. August 10, 2015 2:57:44 pm Org.apache.catalina.loader . WebappClassLoader CLEARREFERENCESJDBC Critical: The Web application [/amst] registered the JDBC driver [Com.mysql.jdbc.Driver] B UT failed to unregister it when the Web application is stopped. To prevent a memory leak, the JDBC Driver have been forcibly unregistered. August 10, 2015 2:57:44 pm Org.apache.catalina.loader . WebappClassLoader clearreferencesthreads Critical: The Web application [/amst] appears to has started a thread named [abandoned Connection cleanup thread] but had failed to stop it. This was very likely to create a memory leak. August 10, 2015 2:57:44 pm Org.apache.catalina.loader.WebappClassLoader clearrefer Encesthreads

2. Cause of error

literal translation: to prevent memory leaks, the JDBC driver has been forced to log out.

3. Solutions

(1) Copy the JDBC driver package to the Tomcatlib directory

(2) Comment out the Server.xml listener in Tomcat

<listener classname= "Org.apache.catalina.core.JreMemoryLeakPreventionListener"/>

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To prevent a memory leak, the JDBC Driver have been forcibly unregistered.