Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.IllegalStateException: Pool not open
### The error may exist in /org/ametys/plugins/survey/data/survey-answers.xml
### The error may involve SurveyAnswer.getSessionCount
### The error occurred while executing a query
### Cause: java.lang.IllegalStateException: Pool not open
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:122)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:73)
	at org.ametys.plugins.survey.data.SurveyAnswerDao.getSessionCount(SurveyAnswerDao.java:103)
	at org.ametys.plugins.survey.dao.SurveyDAO.getStatistics(SurveyDAO.java:666)
	... 103 more
Caused by: java.lang.IllegalStateException: Pool not open
	at org.apache.commons.pool2.impl.BaseGenericObjectPool.assertOpen(BaseGenericObjectPool.java:672)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:412)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
	at org.apache.commons.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:140)
	at org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:62)
	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:315)
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:75)
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:61)
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:303)
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:154)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:102)
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:82)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)
	... 107 more