Jboss异常：SQL Error 17002和SQL Error 17008
原系统为行业内业务系统，布署了两套系统，分别采用Jboss和webLogic作为服务器，两套系统在同一个物理机器上，使用两个端口。
服务器：weblogic12.1.2 Jboss eap6.0
数据库：oracle12(另一个物理机器，两套系统共用)
jboss系统在试运行过程中，会不定时挂掉，经查询jboss日志，当系统挂掉时，会报SQL Error 17008和SQL Error 17002的错误，如下：
09:24:41,771 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-/0.0.0.0:8089-11) SQL Error: 17008, SQLState: 99999
09:24:41,771 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-/0.0.0.0:8089-11) Closed Connection
09:24:41,771 ERROR [org.jboss.as.ejb3.tx.CMTTxInterceptor] (http-/0.0.0.0:8089-11) javax.ejb.EJBTransactionRolledbackException: org.hibernate.exception.GenericJDBCException: Closed Connection
09:24:41,772 ERROR [org.jboss.as.ejb3.invocation] (http-/0.0.0.0:8089-11) JBAS014134: EJB Invocation failed on component JPADAOImpl for method public abstract java.util.List com.XXXX.getObjects(java.lang.String,boolean): javax.ejb.EJBTransactionRolledbackException: org.hibernate.exception.GenericJDBCException: Closed Connection
at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleInCallerTx(CMTTxInterceptor.java:138) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInCallerTx(CMTTxInterceptor.java:203) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:305) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]Caused by: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Closed Connection
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1372) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:317) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]Caused by: org.hibernate.exception.GenericJDBCException: Closed Connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]Caused by: java.sql.SQLException: Closed Connection
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:70)
at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:199) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:263) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]-----------------------------------------------------------------------------------------------------
09:24:54,605 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-/0.0.0.0:8089-7) SQL Error: 17002, SQLState: 08006
09:24:54,605 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http-/0.0.0.0:8089-7) Io exception: Connection timed out
09:24:54,606 ERROR [org.jboss.as.ejb3.tx.CMTTxInterceptor] (http-/0.0.0.0:8089-7) javax.ejb.EJBTransactionRolledbackException: org.hibernate.exception.JDBCConnectionException: Io exception: Connection timed out
09:24:54,606 ERROR [org.jboss.as.ejb3.invocation] (http-/0.0.0.0:8089-7) JBAS014134: EJB Invocation failed on component JPADAOImpl for method public abstract java.lang.Object com.XXXX.jpa.JPADAO.getSingleObject(java.lang.String,java.lang.Object[]): javax.ejb.EJBTransactionRolledbackException: org.hibernate.exception.JDBCConnectionException: Io exception: Connection timed out
at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleInCallerTx(CMTTxInterceptor.java:138) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInCallerTx(CMTTxInterceptor.java:203) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:305) [jboss-as-ejb3-7.1.2.Final-redhat-1.jar:7.1.2.Final-redhat-1]Caused by: javax.persistence.PersistenceException: org.hibernate.exception.JDBCConnectionException: Io exception: Connection timed out
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1372) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1295) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:265) [hibernate-entitymanager-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]Caused by: org.hibernate.exception.JDBCConnectionException: Io exception: Connection timed out
at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:131) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110) [hibernate-core-4.1.3.Final-redhat-1.jar:4.1.3.Final-redhat-1]Caused by: java.sql.SQLRecoverableException: Io exception: Connection timed out
at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:101)
at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:133) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:199) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:263) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:521) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]Caused by: java.net.SocketException: Connection timed out
at java.net.SocketInputStream.socketRead0(Native Method) [rt.jar:1.6.0_30]
at java.net.SocketInputStream.read(SocketInputStream.java:129) [rt.jar:1.6.0_30]
at oracle.net.ns.Packet.receive(Packet.java:240) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]
at oracle.net.ns.DataPacket.receive(DataPacket.java:92) [ojdbc14.jar:Oracle JDBC Driver version - "10.2.0.3.0"]从日志上看，是因为数据库连接关闭导致发生异常。调整数据库连接池大小、增加事务超时时间均无效果。
Jboss的配置文件standalone.xml：向datasources节点中的datasource子节点增加validation节点，如下
jdbc:oracle:thin:@IP地址:1521:orcl
oracle.jdbc.driver.OracleDriver
oracle
2
20
true
false
FailingConnectionOnly
DBUserName
DBPassword
oracle.jdbc.xa.client.OracleXADataSource