Delay obtaining connections in JBoss Web Server (JWS)

Issue

• Encountering delays obtaining connections from Tomcat (DBCP) pool

• Successive thread dumps reveal lengthy pauses with thread stacks such as the below

  ... java.lang.Thread.State: RUNNABLE
      ...
      at oracle.net.nt.TimeoutSocketChannel.read(TimeoutSocketChannel.java:144)
  ...
      at oracle.jdbc.driver.T4CConnection.doPingDatabase(T4CConnection.java:4874)
      ...
      at oracle.jdbc.driver.PhysicalConnection.pingDatabase(PhysicalConnection.java:5376)
      at oracle.jdbc.driver.T4CConnection.isValid(T4CConnection.java:4926)
      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:357)
      at org.apache.tomcat.dbcp.dbcp2.PoolableConnectionFactory.validateObject(PoolableConnectionFactory.java:342)
      at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:478)
      at org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:359)
      at org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:134)
      at org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1532)