Java EE & Spring Cheatsheet

JSTL 1.2 Core JSP Taglib (aka c tag)

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

JSTL implementation jar has to exist on the classpath, eg add following dependency (in provided scope if container doesn’t provides it)

<dependency>
  <groupId>jstl</groupId>
  <artifactId>jstl</artifactId>
  <version>1.2</version>
</dependency>

See this blog post for more info.

Spring Taglib

  • Spring:
    <%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
  • Form:
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

JSTL fmt Taglib

<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>

web.xml deployment descriptor

  • v2.3
    <!DOCTYPE web-app PUBLIC
     "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd" >
    
    <web-app>
      
    </web-app>
    
  • v3.0
    <?xml version="1.0" encoding="UTF-8"?>
    <web-app version="3.0"
             xmlns="http://java.sun.com/xml/ns/javaee"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
        
    </web-app>
    

Commons DBCP / MySQL Spring Bean Config

<!-- JDBC Data Source -->
<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://localhost:3306/hibernatefiddle"/>
  <property name="username" value="root"/>
  <property name="password" value=""/>
  <property name="validationQuery" value="SELECT 1"/>
  <property name="testWhileIdle" value="true"/>
</bean>

Hibernate / MySQL Session Factory & Transaction Manager Spring Bean Config

<!-- Hibernate Session Factory -->
<bean id="mySessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
  <property name="dataSource" ref="myDataSource"/>
  <property name="packagesToScan">
    <array>
      <value>com.gerrytan.hibernatefiddle</value>
    </array>
  </property>
  <property name="hibernateProperties">
    <value>
      hibernate.dialect=org.hibernate.dialect.MySQLDialect
    </value>
  </property>
</bean>

<!-- Hibernate Transaction Manager -->
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
  <property name="sessionFactory" ref="mySessionFactory"/>
</bean>

Log4j Properties File

# Root logger option
log4j.rootLogger=INFO, stdout

# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c:%L - %m%n

This will print log in following format:

2013-06-26 10:15:35 DEBUG com.gerrytan.hibernatefiddle.StudentDAO:21 - StudentDAO created

To create file logger, limited to 5 file with max size 1000KB:

# Root logger option
log4j.rootLogger=WARN, file
 
# Rolling file appender
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=MyLog.log
log4j.appender.file.MaxFileSize=1000KB
log4j.appender.file.MaxBackupIndex=5
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c:%L - %m%n

Hibernate Logging

log4j.logger.org.hibernate.SQL=DEBUG
log4j.logger.org.hibernate.engine.transaction=DEBUG

On Hibernate 3 or earlier transaction logger is:

log4j.logger.org.hibernate.transaction=DEBUG
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