在JAVA中JDK版本与JDBC版本的一致性十分重要，开发都们常常会忽略了这一点导致很多不必要的错误。昨天给客户排查了一个关于EDB在JBoss中使用时关于这方面的问题，希望给大家一点启发。
系统环境：
Red Hat Enterpirse Linux 6
JBoss Enterprise Application Server 6
EnterpriseDB Postgres Plus Advanced Server 9
Oracle JDK 1.6
问题症状：
在JBoss日志中间歇性地出现以下错误
java.sql.SQLException: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/jdbc/DSZY101----Caused by: javax.resource.ResourceException: IJ000453: Unable to get managed connection for java:/jdbc/DSZY101-- at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.getManagedConnection(AbstractConnectionManager.java:390)-- at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.getManagedConnection(TxConnectionManagerImpl.java:368)-- at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:464)-- at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:159)-- at jp.co.toyota.perz060.servlet.CCERZ060.getConnection(CCERZ060.java:489)-- at jp.co.toyota.perz060.servlet.CCERZ060.doPost(CCERZ060.java:118)-- at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)-- at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)-- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)-- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)-- at jp.co.toyota.pzy1352.util.CIZY1392.doFilter(CIZY1392.java:362)-- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)-- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)-- at jp.co.toyota.pzy1900.util.CIZY1947.doFilter(CIZY1947.java:99)-- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)-- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)-- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)-- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)-- at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)-- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)-- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)-- at org.apache.catalina.core.StandardEngineva lve.invoke(StandardEngineva lve.java:109)-- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)-- at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:505)-- at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:452)-- at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:931)-- at java.lang.Thread.run(Thread.java:662)----Caused by: javax.resource.ResourceException: IJ000658: Unexpected throwable while trying to create a connection: null-- at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreArrayListManagedConnectionPool.getConnection(Sema