If you’re growing an online utility then it is higher to make use of server managed connection pool and entry them utilizing JNDI. Spring configuration can be generic and simply primarily based on the JNDI identify of Datasource so it would work on any J2EE Server e.g. Glassfish, WebLogic, JBoss, or WebSphere till the JNDI identify is identical.
Btw, Tomcat is my favourite internet server and I take advantage of it so much on improvement because it comes built-in with IDE like Eclipse and Netbeans. I’m utilizing it for all check and improvement functions, and lots of firms even run Tomcat in Manufacturing for internet hosting Java internet purposes.
It is easy, quick, and really strong, although beware with java.lang.OutOfMemoryError: PermGen area in tomcat, which might trigger a reminiscence leak in Java utility. It often occurs because of ThreadLocal variables and JDBC drivers however you’ll be able to certainly keep away from that by figuring out extra
How one can use JNDI database connection pool in Tomcat and Spring
These three steps to configure and run a JNDI Datasource Connection pool for any Java Net utility:
1) Configure knowledge supply in Server and create JNDI identify.
2) Configure internet.xml
3) Configure Spring bean with JNDI Datasource
<?xml model=“1.0” encoding=“UTF-8”?>
<Context antiJARLocking=“true” path=“/springDataSourceDemo”>
<Useful resource identify=“jdbc/springeDataSource”
auth=“Container”
kind=“javax.sql.DataSource”
driverClassName=“oracle.jdbc.driver.OracleDriver”
url=“jdbc:oracle:skinny:@localhost:1521:SPRING_TEST”
username=“root”
password=“root”
removeAbandoned=“true”
removeAbandonedTimeout=“90”
logAbandoned=“true”
maxActive=“20”
maxIdle=“10”
maxWait=“-1”/>
</Context>
Useful resource component will create a JNDI knowledge supply that may be referenced utilizing JNDI identify “jdbc/springeDataSource“.
Tomcat internally makes use of the DBCP and Commons pool library for managing the database connection pool. You may verify the tomcat/lib listing for jar file tomcat-dbcp.jar which is liable for making a database connection pool contained in the tomcat server.
1. internet.xml configuration to entry JNDI Database connection pool
With a purpose to entry any server useful resource out of your internet utility, it is advisable specify the JNDI sources in internet.xml.
You can use the next XML to declare JNDI Datasource in internet.xml:
<resource-ref>
<description>Oracle Spring JNDI Datasource</description>
<res-ref-name>jdbc/springDataSource</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
2. Spring configuration for accessing JNDI Datasource :
This spring configuration is generic sufficient which can be utilized to entry any JNDI knowledge supply deployed on any J2EE or Java EE Server. It’s not tied up with Tomcat. The org.springframework.jndi.JndiObjectFactoryBean is used to lookup JNDI Datasource and bind with javax.sql.DataSource.
<bean id=“springDataSource” class=“org.springframework.jndi.JndiObjectFactoryBean”>
<property identify=“jndiName” worth=“java:comp/env/jdbc/springDataSource”/>
<property identify=“lookupOnStartup” worth=“true”/>
<property identify=“proxyInterface” worth=“javax.sql.DataSource”/>
</bean>
I’ve used XML technique to declare a spring bean right here, however, If you’re utilizing Spring 3.0 or larger than you may as well use Java Configuration and @Bean annotation to declare knowledge supply in a Spring utility. If you’re not acquainted with Java configuration then please verify Spring Documentation to study extra about it.
3. JDBC Driver File in Tomcat Lib
Now the ultimate step is to ensure tomcat lib has a JDBC driver jar file. I often put the JAR file contained in the lib listing of tomcat however you’ll be able to put it anyplace it is sensible and modifies the tomcat classpath to incorporate driver JAR into the classpath.
Now the remainder of the code that makes use of this knowledge supply ought to stay the identical. You will get the Spring DAO supply from the earlier article How one can setup the Database Connection pool within the Spring framework.
That is all about arrange the JNDI Database connection pool in Tomcat. You may observe these steps to arrange a DB Connection pool on your utility. Bear in mind, it is best to at all times use a DB connection pool everytime you connect with the database. It is a widespread finest follow and it’ll considerably enhance the efficiency of your Java internet utility.
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