tomee-maven-plugin

What is this plugin for and will it work on a combat project? Because without it comes the following error:

12-Jan-2019 12:32:08.441 INFO [http-nio-8080-exec-5] org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PoolState.stop HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/chessman_work?zeroDateTimeBehavior=CONVERT_TO_NULL&serverTimezone=UTC&useSSL=false] 12-Jan-2019 12:32:08.468 INFO [http-nio-8080-exec-5] org.apache.openejb.assembler.classic.Assembler.destroyApplication Undeploying app: F:\Developer\Programms\Chessman\ChessmanWork\target\ChessmanWork 12-Jan-2019 12:32:08.874 WARNING [http-nio-8080-exec-5] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesJdbc The web application [ChessmanWork] registered the JDBC driver [com.mysql.cj.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. 12-Jan-2019 12:32:08.876 WARNING [http-nio-8080-exec-5] org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ChessmanWork] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: java.lang.Object.wait(Native Method) java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:144) com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:70) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) java.lang.Thread.run(Thread.java:748) 12-Jan-2019 12:32:09.218 INFO [48] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load []. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1329) at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1006) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.checkContextClassLoaders(AbandonedConnectionCleanupThread.java:96) at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:69) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) 

Here is the plugin itself

  <plugin> <groupId>org.apache.tomee.maven</groupId> <artifactId>tomee-maven-plugin</artifactId> <version>8.0.0-M1</version> <configuration> <tomeeClassifier>plume</tomeeClassifier> <args>-Xmx512m -XX:PermSize=256m</args> <libs> <lib>mysql:mysql-connector-java:8.0.13</lib> </libs> </configuration> </plugin>