最近客户现场的测试环境连的数据库极不稳定，经常会出现需要重新启动数据库的情况， 但是一旦重启数据库 则会出现 提示 ,执行sql错误，原因就是datasource 没有获取新的连接！
那么解决办法就是怎样让jboss每次提供连接的时候都给我们可用的最新的连接！
文章目录
一、环境配置
二、配置文件路径
在数据源standalone.xml配置文件中添加此标签即可
/app/wildfly-10.1.0.Final/standalone/configuration/standalone.xml
三、添加重连标签
<validation>
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
</validation>
四、配置截图
五、配置后的文件总览
<subsystem xmlns="urn:jboss:domain:datasources:1.0">
<datasources>
<datasource jndi-name="java:jboss/datasources/ExampleDS" pool-name="ExampleDS" enabled="true" use-java-context="true">
<connection-url>jdbc:h2:mem:test;DB_CLOSE_DELAY=-1</connection-url>
<driver>h2</driver>
<security>
<user-name>sa</user-name>
<password>sa</password>
</security>
</datasource>
<datasource jndi-name="java:/comp/env/siniteksirm" pool-name="siniteksirm" enabled="true" use-java-context="true">
<connection-url>jdbc:oracle:thin:@localhost:1521:orcl</connection-url>
<driver>oracle</driver>
<pool>
<min-pool-size>10</min-pool-size>
<max-pool-size>100</max-pool-size>
</pool>
<security>
<user-name>broker</user-name>
<password>broker</password>
</security>
<validation>
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
</validation>
</datasource>
<drivers>
<driver name="h2" module="com.h2database.h2">
<xa-datasource-class>org.h2.jdbcx.JdbcDataSource</xa-datasource-class>
</driver>
<driver name="oracle" module="com.oracle.jdbc">
<xa-datasource-class>oracle.jdbc.xa.OracleXADataSource</xa-datasource-class>
</driver>
</drivers>
</datasources>
</subsystem>
六、其他解决办法
6.1. Jboss数据库连接断开自动重连
Jboss默认配置是数据库连接端口后，服务就会出现异常，无法访问，此时必须重启Jboss服务才能重新连接上数据库。
在
jboss/server/defult/deploy/oracle-ds.xml
中加入：
<new-connection-sql>select 1 from dual</new-connection-sql>
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
配置后的文件总览
<?xml version="1.0" encoding="utf-8"?>
<datasources>
<local-tx-datasource>
<jndi-name>OracleDS</jndi-name>
<connection-url>jdbc:oracle:thin:@172.30.26.44:1521:orcl</connection-url>
<driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
<user-name>hadiandev</user-name>
<password>hadiandev</password>
<exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name>
<metadata>
<type-mapping>Oracle9i</type-mapping>
<min-pool-size>5</min-pool-size>
<max-pool-size>20</max-pool-size>
<idle-timeout-minutes>1</idle-timeout-minutes>
<track-statements/>
<prepared-statement-cache-size>32</prepared-statement-cache-size>
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
<new-connection-sql>select 1 from dual</new-connection-sql>
<exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleExceptionSorter</exception-sorter-class-name>
<valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker</valid-connection-checker-class-name>
</metadata>
</local-tx-datasource>
</datasources>
6.2. Jboss配置自动重连数据库
<validation>
<valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker"/>
<check-valid-connection-sql>select 1</check-valid-connection-sql>
<exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLExceptionSorter"/>
</validation>
