Tomcat DBCP 连接用完

Question

尝试使用 Oracle 将 Tomcat 的 JDBC 池集成到我的 Web 应用程序中时，我遇到了ORA-12519, TNS:no appropriate service handler found错误。

我通常会在对应用程序运行集成测试几分钟后间歇性地看到此错误出现。

我的配置是：

• Tomcat/lib 目录中的 Oracle 驱动程序和 Tomcat-DBCP jar

• 两个 Web 应用，都使用相同的资源。 在春季完成的配置：

  <jee:jndi-lookup id="webDS" jndi-name="jdbc/web"
  expected-type="javax.sql.DataSource" />
  

• 在 conf/context.xml 中定义的数据源资源，如下所示：

  <Resource name="jdbc/web" auth="Container" 
  type="javax.sql.DataSource" 
  factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" 
  testWhileIdle="true" 
  testOnBorrow="true" 
  testOnReturn="false" 
  validationQuery="SELECT 1" 
  timeBetweenEvictionRunsMillis="30000" 
  maxActive="20" 
  maxIdle="10" 
  minIdle="5" 
  removeAbandonedTimeout="60" 
  removeAbandoned="false" 
  logAbandoned="true" 
  minEvictableIdleTimeMillis="30000" 
  jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer" 
  username="${database.user}" 
  password="${database.password}" 
  driverClassName="${database.driver}" 
  url="${database.url}" />
  

我已经尝试了其他地方提出的各种建议，例如增加或减少maxActive大小，但到目前为止没有运气。 我以前使用 c3p0 来管理连接池。 使用交换机，我想知道我是否需要执行一些与关闭连接相关的其他配置，因为似乎我正在泄漏它们。

堆栈跟踪：

Caused by: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:124)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:221)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:157)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.connection(StatementPreparerImpl.java:56)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$5.doPrepare(StatementPreparerImpl.java:159)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:183)
at org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareQueryStatement(StatementPreparerImpl.java:157)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1881)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1858)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
at org.hibernate.loader.Loader.doQuery(Loader.java:906)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:348)
at org.hibernate.loader.Loader.doList(Loader.java:2550)
at org.hibernate.loader.Loader.doList(Loader.java:2536)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2366)
at org.hibernate.loader.Loader.list(Loader.java:2361)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:495)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:357)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:198)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1230)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:268)
... 112 more
Caused by: java.sql.SQLException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:489)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:553)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:254)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:32)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:528)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:278)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182)
at org.apache.tomcat.jdbc.pool.PooledConnection.reconnect(PooledConnection.java:315)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:803)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:628)
at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:187)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:128)
at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:70)
at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:301)
at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:214)
... 132 more
Caused by: oracle.net.ns.NetException: Listener refused the connection with the following error:
ORA-12519, TNS:no appropriate service handler found
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:399)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1140)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:340)
... 146 more

Answer 1

您的验证查询 (SELECT 1( 在 Oracle 中不起作用。它必须是select 1 from dual.

似乎在使用错误的验证查询时，应用程序无法识别健康的连接并将所有连接标记为无效。