重新部署后无效的 Jboss 数据源

Question

我正在为 MySql 数据库开发一个使用七个数据源 (ds) 的应用程序。我对它工作时的结果非常满意。但是，当我重新部署我的应用程序时，我遇到了与数据源相关的问题。

这是我在 my-application-ds.xml 中配置的七个 ds 之一：

<xa-datasource>
            <jndi-name>jdbc/my_db_name</jndi-name>
            <xa-datasource-class>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</xa-datasource-class>
            <xa-datasource-property name="URL">jdbc:mysql://192.168.26.2:3306/my_db_name</xa-datasource-property>
            <xa-datasource-property name="User">user</xa-datasource-property>
            <xa-datasource-property name="Password">password</xa-datasource-property>
            <min-pool-size>0</min-pool-size>
            <max-pool-size>5</max-pool-size>
            <idle-timeout-minutes>5</idle-timeout-minutes>
            <exception-sorter-class-name>
            com.mysql.jdbc.integration.jboss.ExtendedMysqlExceptionSorter
            </exception-sorter-class-name>
            <valid-connection-checker-class-name>
            com.mysql.jdbc.integration.jboss.MysqlValidConnectionChecker
            </valid-connection-checker-class-name>
            <track-connection-by-tx/>
</xa-datasource>

我认为我已经根据我在网上找到的所有信息进行了正确配置。

1 .部署应用运行测试OK

2 。重新部署应用，运行测试 NOK

10:07:23,865 WARN [JBossManagedConnectionPool] 尝试获取新连接时可抛出：null

org.jboss.resource.JBossResourceException: Could not create connection; - nested throwable: (java.lang.NullPointerException)
at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:144)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.createConnectionEventListener(InternalManagedConnectionPool.java:577)
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:262)
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:500)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:341)
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:315)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:396)
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:842)
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:88)
at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:69)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:84)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298)
at net.saphety.billing_core.dblayer.datasource.HibernateSession.configure(HibernateSession.java:58)
at net.saphety.billing_core.dblayer.datasource.HibernateSessionFactory.getHibernateSession(HibernateSessionFactory.java:25)
at net.saphety.billing_core.dblayer.datasource.HibDaoCRUD.<init>(HibDaoCRUD.java:35)
at net.saphety.billingcorewebapp.web.FilterHibernateControlSession.doFilter(FilterHibernateControlSession.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NullPointerException
at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:426)
at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:137)
at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:107)
at com.mysql.jdbc.jdbc2.optional.MysqlXADataSource.getXAConnection(MysqlXADataSource.java:47)
at org.jboss.resource.adapter.jdbc.xa.XAManagedConnectionFactory.createManagedConnection(XAManagedConnectionFactory.java:136)
... 34 more

在那之后hibernate抱怨方言......

org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at net.saphety.billing_core.dblayer.datasource.HibernateSession.configure(HibernateSession.java:62)
at net.saphety.billing_core.dblayer.datasource.HibernateSessionFactory.getHibernateSession(HibernateSessionFactory.java:25)
at net.saphety.billing_core.dblayer.datasource.HibDaoCRUD.<init>(HibDaoCRUD.java:35)
at net.saphety.billingcorewebapp.web.FilterHibernateControlSession.doFilter(FilterHibernateControlSession.java:43)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
at java.lang.Thread.run(Thread.java:619)

3 .重新部署 *-ds.xml 文件并运行测试 NOK，没有任何反应……在我的浏览器中，我收到一个空白响应。

4 .重新部署应用程序，一切正常。 :S

MySql 服务器有足够的可用连接。

我有其他数据源项目，但有一个 oracle 服务器，那里没有问题。所以它与MySql有关，但我不知道是什么。

Answer 1

这些问题看起来像 MySql 问题，所以你应该检查那里的日志。

Caused by: java.lang.NullPointerException
    at com.mysql.jdbc.jdbc2.optional.MysqlDataSource.getConnection(MysqlDataSource.java:426)

表示与 MySql 的连接深度失败。给定您与 MySql 实例的连接数量。可能是连接无效，但 JBoss 正在尝试重用它。

尝试更改要使用的数据库连接：

  <min-pool-size>1</min-pool-size>

甚至为零，而不仅仅是在启动时获取池连接。另请查看是否可以配置 MySql 以允许更多同时连接。就目前而言，您的 JBoss 部署在启动时将需要 35 个连接，最多达到 140 个。您真的需要这么多连接吗？MySql 实例是否配置为处理这么多。如果没有，请让这些参数更加一致，您的问题应该会变得更好。

Answer 2

一个侧面的答案。我们有时发现我们需要关闭服务器；从部署中删除测试、数据和工作（如果您不希望旧的混淆，也可以记录）目录；并恢复服务器。大多数情况下，当我们运行不稳定的代码时会发生这种情况，这些代码会因部分事务完成和其他混乱而崩溃。这些文件夹将在 JBoss 再次启动时重新生成。请参阅this webpage 了解这些文件夹的作用。