Tomcat startup problem

2018-5-14 10:58:50 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
: The web application [/SCM] registered the JBDC driver [com.alibaba.druid.mock.MockDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
2018-5-14 10:58:50 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
: The web application [/SCM] registered the JBDC driver [com.microsoft.sqlserver.jdbc.SQLServerDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
2018-5-14 10:58:50 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
: The web application [/SCM] registered the JBDC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
2018-5-14 10:58:50 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
: The web application [/SCM] appears to have started a thread named [DefaultQuartzScheduler_QuartzSchedulerThread] but has failed to stop it. This is very likely to create a memory leak.
2018-5-14 10:58:50 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap
: The web application [/SCM] created a ThreadLocal with key of type [net.sf.json.AbstractJSON$1] (value [net.sf.json.AbstractJSON$1@1b490621]) and a value of type [java.util.HashSet] (value [[]]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.
2018-5-14 10:59:05 org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
: Exception invoking periodic operation: 
java.lang.OutOfMemoryError: PermGen space
2018-5-14 10:59:17 org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor processChildren
: Exception invoking periodic operation: 
java.lang.OutOfMemoryError: PermGen space

from yesterday to today, all the solutions to memory leaks on the Internet are not working.


if all the solutions to memory leaks on the Internet don't work, you may not have this problem if you try another computer


re-dow the project


the error is very detailed, and the permanent memory is overflowed. Just enlarge it.

-XX:MaxPermSize=128m

if not, it may be that the parameters are not added correctly at all.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bdbca2-312b1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bdbca2-312b1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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