Hibernate C3P0问题

Question

I am trying to use the c3p0 settings , to enable the application to auto discard a stale connection, and reestablish the connection automatically.I have set the configuration properties as below in the sessionfactoryprovider class :

configuration.setProperty("hibernate.c3p0.min_size", c3p0
                .get("minPoolSize") != null ? c3p0.get("minPoolSize")
                : "1");
configuration.setProperty("hibernate.c3p0.max_size", c3p0
                .get("maxPoolSize") != null ? c3p0.get("maxPoolSize")
                : "50");
configuration.setProperty("hibernate.c3p0.timeout", c3p0
                .get("maxIdleTime") != null ? c3p0.get("maxIdleTime")
                : "900");
configuration.setProperty(
                "hibernate.c3p0.acquireRetryAttempts",
                c3p0.get("acquireRetryAttempts") != null ? c3p0
                                .get("acquireRetryAttempts") : "30");
configuration.setProperty(
                "hibernate.c3p0.acquireIncrement",
                c3p0.get("acquireIncrement") != null ? c3p0
                                .get("acquireIncrement") : "5");
configuration.setProperty(
                "hibernate.c3p0.idleConnectionTestPeriod",
                c3p0.get("idleConnectionTestPeriod") != null ? c3p0
                                .get("idleConnectionTestPeriod") : "60");
configuration.setProperty("hibernate.c3p0.initialPoolSize", c3p0
                .get("minPoolSize") != null ? c3p0.get("minPoolSize")
                : "1");
configuration.setProperty(
                "hibernate.c3p0.maxStatements",
                c3p0.get("maxStatementsPerConnection") != null ? c3p0
                                .get("maxStatementsPerConnection")
                                : "0");
configuration.setProperty("preferredTestQuery", "select 1 from dual");
configuration.setProperty("hibernate.c3p0.testConnectionOnCheckin",
                "true");
configuration.setProperty("hibernate.c3p0.testConnectionOnCheckout",
                "true");
configuration.setProperty("testConnectionOnCheckin", "true");
configuration.setProperty("hibernate.c3p0.preferredTestQuery",
                "select 1 from dual");

I don't find any logs in the application , trying to execute the test query, nor is it recovering after a db restart. "show_sql" s set to true in the properties file, and in the logs, I can see the other queries executing.
The package versions are as follows : C3P0 = 0.9.1.2; HibernateAnnotations = 3.3; Hibernate = 3.3;

Could someone please suggest how I should go about debugging this ?

Answer 1

尝试设置c3p0的日志记录级别以在log4j配置中进行调试：

log4j.category.com.mchange=DEBUG