带有 Hibernate 3.2.6/JPA 的 c3p0 连接池库 - 无法打开连接
[英]c3p0 connection pooling library with Hibernate 3.2.6/JPA - Cannot open connection
问题描述
My application have two quartz jobs readning two different tables from Oracle DB in the same time.
我的应用程序有两个石英作业，同时从 Oracle DB 读取两个不同的表。 I am trying to get a connection from pool using c3p0 with Hibernate and Oracle.我正在尝试使用带有 Hibernate 和 Oracle 的 c3p0 从池中获取连接。 When Tomcat 7 starts it seems like C3P0 is initialized:当 Tomcat 7 启动时，似乎 C3P0 已初始化：
2021-02-15 18:47:26,271 [INFO] Hibernate EntityManager 3.2.1.GA
2021-02-15 18:47:26,290 [INFO] Hibernate Annotations 3.2.1.GA
2021-02-15 18:47:26,299 [INFO] Hibernate 3.2.6
...
2021-02-15 18:47:27,473 [INFO] Initializing c3p0-0.9.1 [built 16-January-2007 14:46:42;
2021-02-15 18:47:27,621 [INFO] Initializing c3p0 pool... com.mchange.v2.c3p0.PoolBackedDataSource@add8f7b3 [ connectionPoolDataSource -> com.mchange.v2.c3p0.WrapperConnectionPoolDataSource@e6d03554 [ acquireIncrement -> 1, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, ... ]2021-02-15 18:47:28,240 [INFO] RDBMS: Oracle, version: Oracle Database 11g Release 11.1.0.0.0 - Production
2021-02-15 18:47:28,241 [INFO] JDBC driver: Oracle JDBC driver, version: 10.2.0.4.0
2021-02-15 18:47:28,280 [INFO] Using dialect: org.hibernate.dialect.Oracle10gDialect
But after a few lines, it is still showing Hibernate built-in connection pool, I don't know if that's the way it should be?但是几行之后还是显示Hibernate内置连接池，不知道是不是应该这样？ : ：
2021-02-15 18:47:37,726 [INFO] Using Hibernate built-in connection pool (not for production use!)
2021-02-15 18:47:37,726 [INFO] Hibernate connection pool size: 20
Anyway, after first job successful got data from Oracle DB, second job could not obtain a connection from pool because it is closed:无论如何，在第一个作业成功从 Oracle DB 获取数据后，第二个作业无法从池中获取连接，因为它已关闭：
2021-02-15 18:48:38,923 [WARN] SQL Error: 0, SQLState: null
2021-02-15 18:48:38,923 [ERROR] com.mchange.v2.c3p0.PoolBackedDataSource@add8f7b3 [ connectionPoolDataSource -> com.mchange.v2.c3p0.WrapperConnectionPoolDataSource@e6d03554 [ acquireIncrement -> 1, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, debugUnreturnedConnectionStackTraces -> false, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 2zgg5baf1aa5t7d1frz5fs|700f6fc5, idleConnectionTestPeriod -> 3000, initialPoolSize -> 10, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 300, maxIdleTimeExcessConnections -
2021-02-15 18:48:38,923 [DEBUG] [docadmin] ccmwsWebQuartz::GenerateDocumentTypeOfRequestJob.generateDocumentTypeOfRequest() - errororg.hibernate.exception.GenericJDBCException: Cannot open connection
2021-02-15 18:48:38,923 [DEBUG] ccmwsWebQuartz::GenerateDocumentTypeOfRequestJob.generateRequest(): exception: org.hibernate.exception.GenericJDBCException: Cannot open connection 1613411318923 ms.
Caused by: org.hibernate.exception.GenericJDBCException: Cannot open connection
Configuration file look like this: persistence.xml配置文件如下所示： persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<!-- Persistence deployment descriptor for dev profile -->
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0">
<persistence-unit name="jpaCcmwsWebJob">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<!-- RAZVOJ -->
<properties>
<property name="hibernate.connection.url" value="jdbc:oracle:thin:@10.129.12.158:1520:orcl" />
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<property name="hibernate.connection.driver_class" value="oracle.jdbc.OracleDriver" />
<property name="hibernate.connection.password" value="docadmin2010" />
<property name="hibernate.connection.username" value="docadmin" />
<property name="hibernate.show_sql" value="false" />
<property name="hibernate.c3p0.acquire_increment" value="1" />
<property name="hibernate.c3p0.min_size" value="10" />
<property name="hibernate.c3p0.max_size" value="20" />
<property name="hibernate.c3p0.timeout" value="300" />
<property name="hibernate.c3p0.max_statements" value="50" />
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider" />
<property name="hibernate.c3p0.idle_test_period" value="3000" />
</properties>
</persistence-unit>
</persistence>
Oracle connection type is Basic . Oracle 连接类型为Basic 。
Any ideas what I was doing wrong?任何想法我做错了什么？
1 个解决方案
解决方案1
0 2021-02-15 20:45:10
That's an old hibernate version.那是一个旧的 hibernate 版本。
Which are your dependencies for hibernate-c3p0 and c3p0? hibernate-c3p0 和 c3p0 的依赖项是什么？
Checking from another post, it seems that the connection provider class for c3p0 was org.hibernate.connection.C3P0 but was deprecated later for org.hibernate.connection.C3P0ConnectionProvider .从另一篇文章中检查，似乎 c3p0 的连接提供程序 class 是org.hibernate.connection.C3P0但后来不推荐使用org.hibernate.connection.C3P0ConnectionProvider 。
Maybe based on your hibernate version you should try using the older connection provider class.也许根据您的 hibernate 版本，您应该尝试使用较旧的连接提供商 class。
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.