Posts tagged Spring

OpenSessionInViewInterceptor for Spring + Hibernate3

Filed under ,

- keeps the hibernate session open long enough for the view to render what is needed before it is closed
- allows access to lazy loaded associations without “LazyInitializationException” exception

applicationContext.xml
 
<bean id="openSessionInViewInterceptor"
    class="org.springframework.orm.hibernate3.support.OpenSessionInViewInterceptor">
    <property name="sessionFactory">
        <ref local="sessionFactory"/>
    </property>
    <property> name="flushModeName">
        <value>FLUSH_AUTO</value>
    </property>
</bean>
 
<property name="interceptors">
  <list>
    <ref bean="openSessionInViewInterceptor" />
  </list>
</property>

OpenSessionInViewFilter

web.xml
<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
 
<filter-mapping>
<filter-name>openSessionInViewFilter</filter-name>
<url-pattern>*.html</url-pattern>
</filter-mapping>
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Log4j configuration in Spring

Filed under 
web.xml
 
   <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>/WEB-INF/log4j.xml</param-value>
    </context-param>
 
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>
log4j.xml
 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >
<log4j:configuration>
    <appender name="stdout" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p %c{1}:%L %m %n" />
<!--
ConversionPattern format specification
%d      inserts the date; you can specify the format (%d{yyyy-MM-dd HH:mm:ss,SSS})
%-5p    inserts the priority log level, 5 characters, left justified
%c{1}   inserts the name of the class
%L      inserts the line number
%m      inserts the user message
%n      inserts the separator (for example, a new line)
-->
            <param name="MaxFileSize" value="512KB" />
            <param name="MaxBackupIndex" value="10" />
        </layout>
    </appender>
 
    <appender name="fileAppender" class="org.apache.log4j.RollingFileAppender">
        <param name="Threshold" value="INFO" />
        <param name="File" value="${webapp.root}/WEB-INF/logs/helloworld.log"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%d %-5p %c{1}:%L %m %n" />
        </layout>
    </appender>
 
 
    <logger name="org.springframework">
        <level value="error"/>
    </logger>
 
    <logger name="org.hibernate">
        <level value="error"/>
    </logger>
 
 
    <logger name= "net.pack">
        <level value="debug"/>
    </logger>
 
 
    <root>
        <priority value="info"></priority>
        <appender-ref ref="stdout"/>
        <appender-ref ref="fileAppender"/>
    </root>
</log4j:configuration>
 
public class TestController {
 
    private static final Logger logger = Logger.getLogger(TestController.class);
 
     public ModelAndView addTest(@ModelAttribute("test") Test test, BindingResult result) {
        logger.debug("test logging --debug");
     }
 
}
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ActiveMQ configuration in Spring web application

Filed under

Point to Point (using Queue)

applicationContext.xml
 
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:jms="http://www.springframework.org/schema/jms"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms.xsd">
 
  <context:component-scan base-package="jms" />
    <context:annotation-config />
 
    <bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
            <value>tcp://localhost:61616</value>
        </property>
    </bean>
 
    <bean id="destination" class="org.apache.activemq.command.ActiveMQQueue">
        <constructor-arg value="testQueue"/>
    </bean>
 
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="defaultDestination" ref="destination"/>
    </bean>
 
    <jms:listener-container connection-factory="connectionFactory">
        <jms:listener destination="testQueue" ref="messageReceiver" method="receive"/>
    </jms:listener-container>
 
</beans>
MessageReceiver.java
 
@Component
public class MessageReceiver {
 
	public void receive(Map message) throws Exception {
 
	    String msg = (String) message.get("message");
 
	  }
}
MessageSender.java
 
@Controller
@RequestMapping("/sendMsg")
public class MessageSender {
 
    @Autowired
    private JmsTemplate jmsTemplate;
 
    @RequestMapping(method=RequestMethod.GET)
    public String send() {
        System.out.println("Sending...");
        sendMessage("how u doin!!");
        return "";
    }
 
    public void sendMessage(final String msg) {
        jmsTemplate.send(
                new MessageCreator() {
                    public Message createMessage(Session session) throws JMSException {
                        MapMessage mapMessage = session.createMapMessage();
 
                        mapMessage.setString("message", msg);
                        return mapMessage;
                    }
                }
        );
 
        System.out.println("Message sent> " + msg);
    }
}

Publisher – Subscriber (using Topic)

 
    <bean id="connectionFactory" class="org.apache.activemq.ActiveMQConnectionFactory">
        <property name="brokerURL">
            <value>tcp://localhost:61616</value>
        </property>
    </bean>
 
    <bean id="destination" class="org.apache.activemq.command.ActiveMQTopic">
        <constructor-arg value="testTopic"/>
    </bean>
 
    <bean id="jmsTemplate" class="org.springframework.jms.core.JmsTemplate">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="defaultDestination" ref="destination"/>
    </bean>
 
    <bean id="smsNotifListener" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="destination" ref="destination"/>
        <property name="messageListener" ref="smsSubscriber"/>
    </bean>
 
    <bean id="emailNotifListener" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="destination" ref="destination"/>
        <property name="messageListener" ref="emailSubscriber"/>
    </bean>

Required Jars:
1. activemq-all-5.5.0 jar
2. log4j-1.2.16
3. slf4j-api-1.5.8
4. slf4j-log4j12-1.5.8
5. jcl-over-slf4j-1.5.8

Tutorial

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Unicode/UTF-8 in Spring web application

Filed under 
web.xml
 
    <filter>
        <filter-name>encoding-filter</filter-name>
        <filter-class>
        org.springframework.web.filter.CharacterEncodingFilter
        </filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
 
    <filter-mapping>
        <filter-name>encoding-filter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
dispatcher-servlet.xml
 
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!-- PostgreSQL -->
        <property name="driverClassName" value="org.postgresql.Driver"/>
        <property name="url" value="jdbc:postgresql://localhost:5432/test?useUnicode=true&amp;characterEncoding=UTF-8&amp;connectionCollation=utf8_general_ci&amp;characterSetResults=UTF-8"/>
        <property name="username" value="postgres"/>
        <property name="password" value="pass"/>
        <!-- MySQL -->
        <!-- 
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8&amp;connectionCollation=utf8_general_ci&amp;characterSetResults=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="pass"/>
        -->
    </bean>
*.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
Tomcat's server.xml
 
<Connector port="8080" maxHttpHeaderSize="8192"
 maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
 enableLookups="false" redirectPort="8443" acceptCount="100"
 connectionTimeout="20000" disableUploadTimeout="true" 
 compression="on" 
 compressionMinSize="128" 
 noCompressionUserAgents="gozilla, traviata" 
 compressableMimeType="text/html,text/xml,text/plain,text/css,text/ javascript,application/x-javascript,application/javascript"
 URIEncoding="UTF-8"
/>
*.jsp
 
 <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="fi">
   <head>
   <meta http-equiv='Content-Type' content='text/html; charset=UTF-8' />
   ...

- Create the tables with UTF-8 encoding.

Tutorial

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Spring + Hibernate Validation Example

Filed under 
 dispatcher-servlet.xml
 
   <mvc:annotation-driven />
 
     <bean id="validator"
class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>
 Controller.java
 
   @RequestMapping(value = "/save", method = RequestMethod.POST)
    public String saveTest(@ModelAttribute("test") @Valid Test test, BindingResult result) {
        //handle error
 
        if (result.hasErrors() || result.hasFieldErrors()) {
            return "testAdd";
        }
 Test.java
 
@Entity
@Table(name = "test")
@Proxy(lazy = false)
public class Test implements Serializable {
 
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int id;
 
    @NotEmpty
    private String name;
 
    private String sex;
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