spring dbcp连接不释放

问题描述

这个spring配置，在使用过程中，基本上没插入200条数据后，通过mysql或netstat就可看到数据库连接达到10个，

并且mysql里面全部都是sleep状态。连接并没有释放，在等几十条后就出现异常。

dbcp配置

<bean id="writeSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> 
<property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
<property name="url" value=jdbc:mysql://db.test.com:3306/TEST_DB" /> 
<property name="username" value="root" /> 
<property name="password" value="abc123" /> 
<property name="maxIdle" value="30" /> 
<property name="minIdle" value="5" /> 
<property name="maxWait" value="30000" /> 
<property name="maxActive" value="10" /> 
<property name="testOnBorrow" value="true" /> 
<property name="testWhileIdle" value="true" /> 
<property name="validationQuery" value="select 1" /> 
</bean> 

spring 注解事务

<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />

以下为stack信息

### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, cause: Timeout waiting for idle object, cause: Timeout waiting for idle object 
### The error may exist in configure/mybatis/User.xml 
### The error may involve novel.Novel_read 
### The error occurred while executing a query 
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, cause: Timeout waiting for idle object, cause: Timeout waiting for idle object 
        at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:23) ~[mybatis-3.2.3.jar:3.2.3] 
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:107) ~[mybatis-3.2.3.jar:3.2.3] 
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98) ~[mybatis-3.2.3.jar:3.2.3] 
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:62) ~[mybatis-3.2.3.jar:3.2.3] 
        at sun.reflect.GeneratedMethodAccessor24.invoke(Unknown Source) ~[na:na] 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_45] 
        at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_45] 
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358) ~[mybatis-spring-1.2.1.jar:1.2.1] 
        ... 45 common frames omitted 
Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, cause: Timeout waiting for idle object, cause: Timeout waiting for idle object 

mysql状态采样(其余一样，共10个)

| 3 | root | localhost:34779 | test_db | Sleep | 659 | | NULL |

网络状态采样(其余一样，共10个）

tcp 0 0 ::ffff:127.0.0.1:34941 ::ffff:127.0.0.1:3306 ESTABLISHED 23223/java

使用c3p0和tomcat连接池均测试过，问题依旧存在。

c3p0配置如下：

<bean id="writeSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://db.test.com:3306/TEST_DB" />
<property name="user" value="root" />
<property name="password" value="abc123" />
<property name="maxPoolSize" value="10" />
<property name="minPoolSize" value="5" />
<property name="initialPoolSize" value="5" />
<property name="acquireIncrement" value="2" />
<property name="maxIdleTime" value="3000" />
</bean>

软件版本

mysql版本5.6.14

mysql-connector 5.1.22

执行的插入SQL

<insert id="USER_create" parameterType="User" useGeneratedKeys="true" keyProperty="id">
insert into LT_USER (
NAME,
DESCN,
IMG,
CATEGORY_ID,
IS_FINISH,
CREATE_DATE,
STATUS
) values (
#{name, jdbcType=VARCHAR},
#{descn, jdbcType=VARCHAR},
#{img, jdbcType=VARCHAR},
#{categoryId, jdbcType=NUMERIC},
#{isFinish},
#{createDate},
#{status}
)
</insert>


@Repository
public class UserDao extends SqlSessionDaoSupport {
    public long create(final String sqlId, final Parameter parameter) {
        return this.getSqlSession().insert(sqlId, parameter.getCriteria());
    }
}

事务配置

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:configure/mybatis/Configuration.xml" />
</bean>

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />