Java EE 7 examples for SE2 classes

Required tools

• Java SE Development Kit 8. If you want to use Java 7, switch the maven.compiler.source and maven.compiler.target version in your pom.xml from 1.8 to 1.7.
• Glassfish Open Source Edition 4.1
• Your favourite IDE for Java EE (NetBeans for Java EE (suggested), Eclipse IDE For Java EE Developers)
• Maven (Optional: already integrated in both IDEs, required if you need to run maven through the CLI)
• MySQL Community Server

Starting Maven Archetype

Group ID: com.airhacks
Artifact ID: javaee7-essentials-archetype
Version: 1.2
Repo: http://repo.maven.apache.org/maven2/
Description: Java EE 7 project template. Clean, lean and minimalistic.

• From CLI: Run

  mvn archetype:generate \
    -DarchetypeCatalog=http://repo.maven.apache.org/maven2/ \
    -Dfilter=com.airhacks:javaee7-essentials-archetype
  

• From Netbeans: File -> New Project -> Maven Project from Archetype -> Search "essentials"

• From Eclipse

  • The first time you need to add the Repo: Eclipse -> Preferences -> Maven -> Archetypes -> Add Remote Catalog... http://repo.maven.apache.org/maven2/
  • File -> New -> Project ... -> Maven Project -> Filter "essential"

Glassfish

How to start and stop the server

• From Netbeans:
  • Services tab -> Right click on Servers -> add server...
  • Services tab -> Right click on Glassfish Server -> Start/Stop
• From Eclipse:
  • Servers tab -> Right click -> New -> Server...
  • Servers tab -> Right click on Glassfish -> Start/Stop
• From CLI:
  • glassfish/bin/asadmin start-domain
  • glassfish/bin/asadmin stop-domain

Access the Control Panel

Once started, go to http://localhost:4848. Default username and password are both "admin".

Run the examples

• Download the repo for the first time, run (or use your favourite git client)

  git clone https://github.com/deib-polimi/teaching-se2.git
  

  for future updates of the repo, run

  git pull
  

• Open a project in your IDE:

  • Netbeans: File -> Open Project
  • Eclipse: File -> Import Project -> Existing Maven Project

• Create a connection to the glassfish server in your IDE:

  • Netbeans: "Services" tab -> Right-click on Servers -> add server
  • Eclipse: "Servers" tab -> New -> Server

• Configure the project to be run on Glassfish

  • Netbeans: Right-click on the project -> Properties -> Run -> Server: GlassFish Server
  • Eclipse: Right-click on the project -> Properties -> Server: Glassfish

• Run the project

  • Netbeans: Run
  • Eclipse: Run on server

MySQL

How to start and stop mysql server

• on Windows: instuctions

• on Linux / OSX:

   sudo /usr/local/mysql/support-files/mysql.server [start|stop|restart]
  

How to create a database

Here are the instructions from command line, but you can do the same from your IDE or using any mysql GUI client (e.g., MySQL Workbench).

• login as root (default password is empty)

   shell> mysql -u root -p
  

• create a database

   mysql> create database mydb;
  

These other two guides may be of interest:

• http://dev.mysql.com/doc/refman/5.7/en/resetting-permissions.html
• http://dev.mysql.com/doc/refman/5.7/en/adding-users.html

How to connect to MySQL:

• Download MySQL Connector/J
• Follow these instructions to install the library and create a MySQL connection pool
• Add the url to the additional properties of the connection pool. In the end you should have all and only the following ones:
  • DatabaseName: mydb
  • User: root (or any user granted to access mydb)
  • Password: the root password
  • URL: url to the db (e.g., jdbc:mysql://localhost:3306/mydb)
  • ServerName: localhost
• Under JDBC Resources create a new resource (e.g., jdbc/mydb) and assign the new mysql pool

Form based authentication with JDBCRealm

See the "registration" example for project configuration (web.xml, glassfish-web.xml, persistence.xml and User entity).

Follow these steps for creating a JDBCRealm:

• enter Glassfish control panel
• Configurations -> server-config -> security -> Realms -> new...
• Use the following configuration:
  • Realm Name: must be the same referenced in the web.xml
  • Class name: JDBCRealm
  • JAAS Context: jdbcRealm
  • JNDI: your data base resource name, where username, password and group name are going to be saved (e.g., jdbc/mydb)
  • User Table: the table containing username and password (e.g., user)
  • User Name Column: the name of the column containing the username (e.g., email)
  • Password Column: the name of the column containing the password (e.g., password)
  • Group Table: the table containing username and group, can be the user table (e.g., user)
  • Group Table User Name Column: the name of the column in the Group Table containing the username (e.g., email)
  • Group Name Column: the name of the column in the Group Table containing the group name (e.g., groupname). WARNING: do not use "group", since it is a reserved word and queries will fail
  • Password Encryption Algorithm: MD5
  • Digest Algorithm: SHA-256
• Server restart may be required

Interesting Links

• Java EE 7 Official Documentation
• Official java ee 7 Tutorial examples
• A lot of interesting examples by Adam Bien
• JSON schema to POJO