[JBossManagedConnectionPool] Throwable while attempting to get a new connection:

问题：[JBossManagedConnectionPool] Throwable while attempting to get a new connection: null

解答：\jboss-4.2.2\server\default\lib中缺少mysql-connector-java-3.1.12-bin.jar驱动

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1 楼 buger 2010-11-07  

可能是你的数据源配置时，相关文件没有放到相应的位置即：
mysql-connector-java-3.1.12-bin.jarMysql驱动程序放置在\jboss4.0.5\server\default\lib中，而mysql-ds.xml文件放置在\jboss4.0.5\server\default\deploy中。
mysql-ds.xml文件配置位于D:\jboss4.0.5\docs\examples\jca目录中。
还有,在放置文件后要修改相关信息:

<?xml version="1.0" encoding="UTF-8"?>

<!-- $Id: mysql-ds.xml 41016 2006-02-07 14:23:00Z acoliver $ -->
<!--  Datasource config for MySQL using 3.0.9 available from:
http://www.mysql.com/downloads/api-jdbc-stable.html
-->

<datasources>
  <local-tx-datasource>
    <jndi-name>MySqlDS</jndi-name>
    <connection-url>jdbc:mysql://localhost:3306/jbossdb</connection-url>
    <driver-class>com.mysql.jdbc.Driver</driver-class>
    <user-name>root</user-name>
    <password>root</password>
    <exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
    <!-- should only be used on drivers after 3.22.1 with "ping" support
    <valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLValidConnectionChecker</valid-connection-checker-class-name>
    -->
    <!-- sql to call when connection is created
    <new-connection-sql>some arbitrary sql</new-connection-sql>
      -->
    <!-- sql to call on an existing pooled connection when it is obtained from pool - MySQLValidConnectionChecker is preferred for newer drivers
    <check-valid-connection-sql>some arbitrary sql</check-valid-connection-sql>
      -->

    <!-- corresponding type-mapping in the standardjbosscmp-jdbc.xml (optional) -->
    <metadata>
       <type-mapping>mySQL</type-mapping>
    </metadata>
  </local-tx-datasource>
</datasources>