This page is the FAQ for the EJB and other Java EE Technologies
forum, where you can ask question about anything you read here. This page is editable by everyone, so add your own content as you see fit.
Note that "Java EE" is now called "Jakarta EE".
Servlet FAQ JSP FAQ Web Services FAQ Security FAQEnterprisePerformance - Best practices for Java tuningSpecificationUrls - where you can find the specs for all your favorite APIsJEE/J2EE tutorials: J2EE 1.4 - JEE 5 - JEE 6 - JEE 7 - JEE 8Dependency Injection in JEE6: part 1, part 2, part 3, part 4, part 5What's new in JEE 8?
EJB home page
What is the difference between JavaBeansAndEnterpriseJavaBeans
What's new in EJB 3.1? part 1
- part 2
- part 4
- part 5
- A Significant Step Towards Maturity
What's new in EJB 3.2?
(very extensive), Introduction
Extensive tutorial with many code examples
Accessing SMTP response codes in JavaMail
Using delivery status notifications
Using encryption with JavaMail: The JavaMail-Crypto API
project is a bit dated, but it does purport to add S/MIME and OpenPGP support to JavaMail.
Third party extensions
, e.g. local store implementations
is an open source SMTP, POP3 and NNTP server written in Java by the good folks at Apache. Its Mailet API
enables automatic processing of emails, kind of what servlets
do for HTTP requests. Introductory article part 1
, part 2
is an embeddable Java SMTP server. While useful mostly for send-only situations, it has some provisions to receive mails as well (to handle bounces and such).
Q: I'm marking my mails as SEEN, but next time I access the INBOX, they're once again presented as unread. What gives?
From the JavaMail FAQ
: Just because a flag exists doesn't mean the flag is supported by all mail servers/providers. For instance, besides deleting messages, the POP protocol supports none of them. ... To find out what flags are supported, ask the folder with getPermanentFlags().
Q: I'm having trouble connecting to Gmail using JavaMail; something about "starttls". What gives?
This, too, is covered in the JavaMail FAQ: How do I access Gmail with JavaMail?
Java Message Service (JMS)
Introduction and tutorial
Specification and javadocs
open source JMS implementations: ActiveMQ
Java Naming and Directory Interface (JNDI)
How to go about ObtainingRemoteJndiContext
Introductory articles on JavaWorld -
1) Naming Services
2) Directory Services
3) Advanced JNDI
4) Example Application
LDAP: Specification Introduction Java Tutorial Chapter
Some software for using LDAP:
OpenLDAP - open source Java LDAP serverLdapTemplate - Java library that simplifies working with the JNDI/LDAP APIs
Java Management Extension (JMX)
- code for an application making MBeans available for monitoring
are tools that come with the JVM and can be used to access local or remove JVMs via JMX.