Tomcat7 JDBC connection pool -> Connection has been abandoned

I have the following configuration for the JDBC connection pool initialSize="2" minIdle="10" maxIdle="50" maxActive="100" maxWait="15000" jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer;org.apache.tomcat.jdbc.pool.interceptor.ResetAbandonedTimer" removeAbandoned="true" removeAbandonedTimeout="60" logAbandoned="true" testOnBorrow="true" testOnReturn="true" testWhileIdle="true" useEquals="false" fairQueue="false" timeBetweenEvictionRunsMillis="300000" minEvictableIdleTimeMillis="300000" validationInterval="10000" validationQuery="SELECT 1" The application is a standard Java+Spring+Hibernate environment, and the database is PostgreSQL. I have been using those configs for a while, and everything was fine... Recently the following exception started to appear Sep 10, 2015 5:25:57 PM org.apache.tomcat.jdbc.pool.ConnectionPool abandon WARNING: Connection has been abandoned PooledConnection[org.postgresql.jdbc4.Jdbc4Connection@3eb948ed]:java.lang.Exception at org.apache.tomcat.jdbc.pool.ConnectionPool.getThreadDump(ConnectionPool.java:1063) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:780) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:619) at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:188) at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:128) at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:70) at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:301) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:214) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:157) at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160) at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1351) at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:59) at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:67) at org.springframework.orm.jpa.vendor.HibernateJpaDialect.beginTransaction(HibernateJpaDialect.java:110) at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380) at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373) at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:420) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:257) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:644) 10 Sep 2015 17:25:57,591 WARN org.hibernate.engine.jdbc.spi.SqlExceptionHelper - SQL Error: 0, SQLState: 08006 10 Sep 2015 17:25:57,592 ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper - An I/O error occurred while sending to the backend. javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: could not extract ResultSet at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387) at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310) at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:316) at com.mysema.query.jpa.impl.AbstractJPAQuery.getSingleResult(AbstractJPAQuery.java:219) at com.mysema.query.jpa.impl.AbstractJPAQuery.uniqueResult(AbstractJPAQuery.java:295) at com.mysema.query.jpa.impl.AbstractJPAQuery.uniqueResult(AbstractJPAQuery.java:281) at com.mysema.query.support.ProjectableQuery.singleResult(ProjectableQuery.java:75) I don't have any new query running too long, but I guess that this happens because the connection is not returned to the pool properly... I tried to play around the configurations, but the same happens, though in rare cases . I'd just like to know if the configurations are fine for the application with an average load, and if there is any chance to improve the connection pool life. Note: When I decrease

and

it starts to happen more often. Any help is appreciated.