Spring3, Hibernate, MySQL: I am working on my first project, can some one please show me how to change the following code to add database pooling? thanks
applicationContext-security-JDBC.xml
<beans:bean class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<beans:property name="driverClassName" value="${database.driver}" />
<beans:property name="url" value="${database.url}" />
<beans:property name="username" value="${database.user}" />
<beans:property name="password" value="${database.password}" />
</beans:bean>
jdbc.properties
database.driver=com.mysql.jdbc.Driver
database.url=jdbc:mysql://127.0.0.1/db_mytest
database.user=root
database.password=
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
hibernate.show_sql=true
thanks.... again
I suggest you to use commons-dbcp. You have to download the jar and add it to the WEB-INF/lib directory (if not already included in your application server). This is your new applicationContext.xml with some default parameters that you should change as you wish:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${database.driver}" />
<property name="url" value="${database.url}" />
<property name="username" value="${database.username}" />
<property name="password" value="${database.password}" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="numTestsPerEvictionRun" value="6" />
<property name="minEvictableIdleTimeMillis" value="1800000" />
<property name="initialSize" value="3" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="10" />
<property name="maxWait" value="5000" />
<property name="poolPreparedStatements" value="true" />
<property name="maxOpenPreparedStatements" value="100" />
</bean>
Hope this helps.
You don't specify what you are running your application on. Many application servers have their own connection pooling implementation that you can tap into. I've used Tomcat's DBCP in the past - was quite easy to set up.
Related
We are creating a Spring boot web app.
DB : JDBC Template and DBCP connection pool.
Java code: A runnable is called in Executors.newSingleThreadScheduledExecutor();
Time interval: 2 min
The code in runnable hits DB using JDBCTemplate.query().
Issue: The heap usage increases to several GBs in few min.
Any Pointers would be helpful to identify the memory leak.
Note: If we comment the JDBCTemplate.query() , memory usage is constant.
Settings of DBCP:
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.OracleDriver" />
<property name="url" value="${batch.jdbc.url}" />
<property name="username" value="******" />
<property name="password" value="******" />
<property name="connectionProperties" value="defaultRowPrefetch=10000;defaultBatchValue=200;" />
<property name="minIdle" value="10" />
<property name="maxIdle" value="12" />
<property name="maxActive" value="100" />
<property name="accessToUnderlyingConnectionAllowed" value="true" />
<property name="initialSize" value="${batch.jdbc.pool.size}"/>
<property name="validationQuery" value="select 1 from dual" />
<property name="validationQueryTimeout" value="5" />
<property name="timeBetweenEvictionRunsMillis" value="120000" />
<property name="minEvictableIdleTimeMillis" value="60000" />
<property name="testOnBorrow" value="true" />
</bean>
Suspect from Eclipse MAT report
One instance of "org.apache.commons.pool.impl.GenericObjectPool" loaded by "org.springframework.boot.loader.LaunchedURLClassLoader # 0x7fc1d90124c8" occupies 1,421,543,264 (94.69%) bytes. The memory is accumulated in one instance of "org.apache.commons.pool.impl.GenericObjectPool" loaded by "org.springframework.boot.loader.LaunchedURLClassLoader # 0x7fc1d90124c8".
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://xxx.xx.xxx.xxx:3306/vod6?autoReconnect=true" />
<!-- <property name="url" value="jdbc:mysql://xxx.xx.xxx.xxx:3306/vod2?autoReconnect=true" /> -->
<property name="username" value="voddb" />
<property name="password" value="vod#123" />
</bean>
above config xml working fine .
<bean id="myDataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${mysql.driverClassName}" />
<property name="url" value="${mysql.url}" />
<property name="username" value="${mysql.username}" />
<property name="password" value="${mysql.password}" />
</bean>
When I am trying to configure jdbc.property and configure them throwing error out of memory
Can you please explain what i am missing?
mysql.database=MYSQL
mysql.driverClassName=com.mysql.jdbc.Driver
mysql.url=jdbc:mysql://xxx.xx.xxx.xxx:3306/vod?autoReconnect=true
mysql.username=voddb
mysql.password=vod#123
mysql.initialSize=4
mysql.maxActive=30
property file
Please confirm whether the placeholder is mentioned correctly in applicationContext.xml file
<context:property-placeholder location="classpath*:catalina.properties" ignore-unresolvable="true"/>
If this is configured correctly please try removing mysql.initialSize=4 mysql.maxActive=30 from properties file and test, this may be thr root cause. Because this is the additional property you have mentioned in properties file
You can try configuring these maxActive,initialSize values in xml itself as property.
<property name="removeAbandonedTimeout" value="180"/>
<property name="removeAbandoned" value="true"/>
<property name="logAbandoned" value="true"/>
<property name="timeBetweenEvictionRunsMillis" value="5000"/>
<property name="minEvictableIdleTimeMillis" value="900000"/>
<property name="maxActive" value="20"/>
<property name="maxIdle" value="4"/>
I am using spring MVC 4.2 I have this code in my app-context.xml
<bean id="beanConstants" name="beanConstants" class="com.my.web.controller.BeanConstants">
<property name="dbProplocation" value="/my/database.properties" />
<property name="extractDbProplocation" value="/my/extract.database.properties" />
<property name="cssLocation" value="uncompiled" />
<property name="enableSuspensionPollingStr" value="false" />
</bean>
<!-- JDBC Session Config -->
<bean class="org.springframework.session.jdbc.config.annotation.web.http.JdbcHttpSessionConfiguration"/>
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="${hibernate.connection.url}" />
<property name="username" value="${hibernate.connection.username}" />
<property name="password" value="${hibernate.connection.password}" />
</bean>
Now this all worked fine until I added the JdbcHttpSessionConfiguration bean. If I take that line out, it works. otherwise I get this:
Caused by: java.lang.IllegalArgumentException:
Could not resolve placeholder 'hibernate.connection.url' in string value "${hibernate.connection.url}"
I am trying to save the sesstion info in the DB. Why is this doing this? What has one got to do with the other?
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName"
value="????????????????????" />
<property name="url"
value="???????????????????????"/>
<property name="username" value="root" />
<property name="password" value="" />
</bean>
I am not able to figure out what should go in driver class name value and url vale. I have downloaded Oracle sql developer and oracle 11 g.But i am not sure how to configure it to my java application
Driver class name:- oracle.jdbc.driver.OracleDriver
URL :- jdbc:oracle:thin:#(hostname):(port number):(database name)
<bean id="dataSource"
class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName"
value="oracle.jdbc.driver.OracleDriver" />
<property name="url"
value="jdbc:oracle:thin:#(hostname):(port number):(database name)"/>
<property name="username" value="root" />
<property name="password" value="" />
</bean>
Your qustion is not clear if you are using Spring framework there are two type of
Data source handling technique
Method 1 you need to configure data source in your application server
<bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="java:jboss/datasources/OracleDS" />
<property name="cache" value="false"/>
<property name="lookupOnStartup" value="false"/>
<property name="proxyInterface" value="javax.sql.DataSource"/>
</bean>
Method 2
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:#127.0.0.1:1521:OMQA" />
<property name="username" value="root" />
<property name="password" value="password" />
</bean>
I use following line of code to read config.properties file in my spring mvc configuration servlet xml file.
<context:property-placeholder location="file:///${config.properties}" />
config.properties contains a property say: propertyName = propertyValue
I want to use this propertyName's value in spring mvc configuration servlet xml file.
Here is an example of configuring as pool with properties taken from a properties file
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:#${database.url}" />
<property name="username" value="${database.username}" />
<property name="password" value="${database.password}" />
<property name="validationQuery" value="SELECT 1 FROM DUAL" />
<property name="testWhileIdle" value="true" />
<property name="timeBetweenEvictionRunsMillis" value="300000" />
<property name="numTestsPerEvictionRun" value="6" />
<property name="minEvictableIdleTimeMillis" value="1800000" />
<property name="initialSize" value="3" />
<property name="maxActive" value="75" />
<property name="maxIdle" value="75" />
<property name="maxWait" value="5000" />
<property name="poolPreparedStatements" value="true" />
<property name="maxOpenPreparedStatements" value="100" />
</bean>
The property file contains there rows
database.url=localhost:1521:xe
database.username=dbusername
database.password=dbpassword
I guess you need to add
<context:property-placeholder location="file:///${config.properties}" />
to your servlet.xml file.