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java.sql.SQLException: com.mysql.jdbc.Driver	at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254)	at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)	at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701)	at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635)	at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486)	at org.apache.tomcat.jdbc.pool.ConnectionPool.(ConnectionPool.java:144)	at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116)	at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103)	at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554)	at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242)	at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141)	at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)	at org.apache.naming.NamingContext.lookup(NamingContext.java:842)	at org.apache.naming.NamingContext.lookup(NamingContext.java:153)	at org.apache.naming.NamingContext.lookup(NamingContext.java:830)	at org.apache.naming.NamingContext.lookup(NamingContext.java:153)	at org.apache.naming.NamingContext.lookup(NamingContext.java:830)	at org.apache.naming.NamingContext.lookup(NamingContext.java:153)	at org.apache.naming.NamingContext.lookup(NamingContext.java:830)	at org.apache.naming.NamingContext.lookup(NamingContext.java:167)	at org.apache.naming.SelectorContext.lookup(SelectorContext.java:156)	at javax.naming.InitialContext.lookup(InitialContext.java:411)	at bachelor.Cronjob.run(Cronjob.java:63)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)