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java.lang.AbstractMethodError: 	at net.sourceforge.jtds.jdbc.JtdsConnection.isValid(JtdsConnection.java:2833)	at org.apache.tomcat.dbcp.dbcp2.DelegatingConnection.isValid(DelegatingConnection.java:917)	at org.apache.tomcat.dbcp.dbcp2.PoolableConnection.validate(PoolableConnection.java:282)	at org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:356)	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.validateConnectionFactory(BasicDataSource.java:2306)	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:2289)	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2038)	at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1532)	at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:92)	at com.atlassian.bamboo.upgrade.AbstractBootstrapUpgradeTask.getDatabaseConnection(AbstractBootstrapUpgradeTask.java:52)	at com.atlassian.bamboo.upgrade.AbstractBootstrapUpgradeTask.withDatabaseConnection(AbstractBootstrapUpgradeTask.java:77)	at com.atlassian.bamboo.upgrade.tasks.validation.ThereIsSingleRowInHibernateUniqueKeyTable.doUpgrade(ThereIsSingleRowInHibernateUniqueKeyTable.java:34)	at com.atlassian.bamboo.upgrade.AbstractUpgradeManager.runUpgradeTask(AbstractUpgradeManager.java:206)	at com.atlassian.bamboo.upgrade.BootstrapUpgradeManagerImpl.runValidationTests(BootstrapUpgradeManagerImpl.java:78)	at com.atlassian.bamboo.setup.DefaultBootstrapManager.performPersistenceUpgrade(DefaultBootstrapManager.java:345)	at com.atlassian.config.bootstrap.DefaultAtlassianBootstrapManager.init(DefaultAtlassianBootstrapManager.java:77)	at com.atlassian.bamboo.setup.BootstrapLoaderListener.contextInitialized(BootstrapLoaderListener.java:117)	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4812)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5255)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)