Java Enterprise Edition FAQ

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".

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Servlet FAQ

JSP FAQ

Web Services FAQ

Security FAQ

EnterprisePerformance - Best practices for Java tuning

SpecificationUrls - where you can find the specs for all your favorite APIs

JEE/J2EE tutorials: J2EE 1.4 - JEE 5 - JEE 6 - JEE 7 - JEE 8

Dependency Injection in JEE6: part 1, part 2, part 3, part 4, part 5

What's new in JEE 8?

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EJB

EJB home page

What is the difference between JavaBeansAndEnterpriseJavaBeans?

What's new in EJB 3.1? part 1 - part 2 - part3 - part 4 - part 5 - A Significant Step Towards Maturity

What's new in EJB 3.2?

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JavaMail

Home page, FAQ (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

James 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

Aspirin 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?

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Java Message Service (JMS)

Introduction and tutorial

Specification and javadocs

open source JMS implementations: ActiveMQ - OpenMQ - Apollo

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Java Naming and Directory Interface (JNDI)

Home page

Tutorial

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 server

LdapTemplate - Java library that simplifies working with the JNDI/LDAP APIs

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Java Management Extension (JMX)

Home page

Introduction

JmxExample - code for an application making MBeans available for monitoring

Best Practices

JConsole and VisualVM are tools that come with the JVM and can be used to access local or remove JVMs via JMX.

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CategoryFaq