I request help in understanding impact, root cause and recovery from the following intermittent error:
WARN org.hibernate.engine.jdbc.spi.SqlExceptionHelper SQL Error: 0, SQLState: 08S01
ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper I/O Error: Connection timed out

After the above error is hit; all subsequently query to database consistently throw following errors; Is there a configuration setting to recover from the above errors without requiring restart:
WARN org.hibernate.engine.jdbc.spi.SqlExceptionHelper SQL Error: 0, SQLState: HY010
ERROR org.hibernate.engine.jdbc.spi.SqlExceptionHelper Invalid state, the Connection object is closed.

Application database pool configuration in tomcat is as follows:
<Resource name="jdbc/xxxx" auth="Container"
type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="net.sourceforge.jtds.jdbc.Driver"
url="jdbc:jtds:sqlserver://xxxxxxxx"
maxTotal="20"
maxIdle="10"
maxWaitMillis="-1"/>

Versions
jdk.version 1.8
hibernate.version 4.3.5.Final
jboss.bom.eap.version 6.4.0.GA

Thanks, I appreciate.

The database might terminate the connection, nut the connection pool is not aware of that. According to Tomcat DBCP configs, you could use:

- testOnBorrow = true
- testWhileIdle = true