Top Five Coffee Ee Bad Practices Coffee Developers Should Avoid
Here are some of the bad coding practices y'all should avoid piece working for a Java EE application or Java Web application inwards general, which runs on a Web Server similar Tomcat or Enterprise Server similar JBoss, WebLogic, or IBM WebSphere:
1) Calling System.exit() from a Web application
It is never a goodness persuasion for a spider web application to effort to nigh downwards the application container. H5N1 telephone band to System.exit() is in all probability business office of leftover debug code or code imported from a non-J2EE application. You tin john farther read my article "Don't job System.exit() on Java spider web application" to larn to a greater extent than about.
2) Storing Non-Serializable Object Stored inwards Session
H5N1 Java EE application tin john brand job of multiple JVMs inwards gild to amend application reliability together with performance. In gild to brand the multiple JVMs look every bit a unmarried application to the end-user, the Java EE container tin john replicate an HttpSession object across multiple JVMs hence that if i JVM becomes unavailable some other tin john mensuration inwards together with accept its house without disrupting the catamenia of the application.
In gild for session replication to work, the values the application stores every bit attributes inwards the session must implement the Serializable interface.
Example 1: The next cast adds itself to the session, simply because it is non serializable, the session tin john no longer last replicated, together with y'all volition run into errors inwards your server log file.
public cast DataTransferObject {
String name;
String value;
public void addToSession(HttpSession session) {
session.setAttribute("dto", this);
}
}
3) Creating Threads
Thread administration inwards a spider web application is forbidden yesteryear the Java EE criterion inwards some circumstances together with is e'er highly error-prone. Managing threads is hard together with is probable to interfere inwards unpredictable ways alongside the conduct of the application container.
Even without interfering alongside the container, thread administration unremarkably leads to bugs that are hard to uncovering together with diagnose similar deadlock, race conditions, together with other synchronization errors.
If y'all are novel into Java EE world, I propose y'all bring together a hands-on course of written report like The Java EE Course - ready a Java EE app from scratch on Udemy to empathise the fundamentals together with basic guidelines required for creating Java EE application. This volition non exclusively forestall y'all from committing these mistakes simply every bit good salve a lot of time.
4) Socket Based Communication
Socket-based communication inwards spider web applications is prone to error. The Java EE criterion permits the job of sockets exclusively for the role of communication alongside legacy systems when no higher-level protocol is available. Authoring your ain communication protocol requires wrestling alongside hard safety issues, including:
Many of the same issues apply to a custom implementation of a criterion protocol. While at that topographic point are unremarkably to a greater extent than resources available that address safety concerns related to implementing a criterion protocol, these resources are every bit good available to attackers.
Btw, Java EE8 has introduced some novel server force technologies, y'all tin john see courses)How to laid upwards a JNDI connector puddle inwards Tomcat? (tutorial) How to ship e-mail from a Java Program? (tutorial) How to configure HTTPS on Tomcat server? (tutorial) Data Access Object Design Pattern inwards Java? (pattern) Difference betwixt JAX-RS together with Jersey? (answer) Top v spider web log Java EE developer should follow (blogs) 5 Java EE Online Training Courses for Java Developers (courses) 10 Spring MVC Annotations Java dev should larn (annotations) Top v Courses to larn Spring Boot inwards 2019 (courses)
Thanks for reading this article hence far. If y'all similar this article together with hence delight percentage alongside your friends together with colleagues. If y'all receive got whatever questions or feedback together with hence delight driblet a note.
1) Calling System.exit() from a Web application
It is never a goodness persuasion for a spider web application to effort to nigh downwards the application container. H5N1 telephone band to System.exit() is in all probability business office of leftover debug code or code imported from a non-J2EE application. You tin john farther read my article "Don't job System.exit() on Java spider web application" to larn to a greater extent than about.
2) Storing Non-Serializable Object Stored inwards Session
H5N1 Java EE application tin john brand job of multiple JVMs inwards gild to amend application reliability together with performance. In gild to brand the multiple JVMs look every bit a unmarried application to the end-user, the Java EE container tin john replicate an HttpSession object across multiple JVMs hence that if i JVM becomes unavailable some other tin john mensuration inwards together with accept its house without disrupting the catamenia of the application.
In gild for session replication to work, the values the application stores every bit attributes inwards the session must implement the Serializable interface.
Example 1: The next cast adds itself to the session, simply because it is non serializable, the session tin john no longer last replicated, together with y'all volition run into errors inwards your server log file.
public cast DataTransferObject {
String name;
String value;
public void addToSession(HttpSession session) {
session.setAttribute("dto", this);
}
}
3) Creating Threads
Thread administration inwards a spider web application is forbidden yesteryear the Java EE criterion inwards some circumstances together with is e'er highly error-prone. Managing threads is hard together with is probable to interfere inwards unpredictable ways alongside the conduct of the application container.
Even without interfering alongside the container, thread administration unremarkably leads to bugs that are hard to uncovering together with diagnose similar deadlock, race conditions, together with other synchronization errors.
If y'all are novel into Java EE world, I propose y'all bring together a hands-on course of written report like The Java EE Course - ready a Java EE app from scratch on Udemy to empathise the fundamentals together with basic guidelines required for creating Java EE application. This volition non exclusively forestall y'all from committing these mistakes simply every bit good salve a lot of time.
4) Socket Based Communication
Socket-based communication inwards spider web applications is prone to error. The Java EE criterion permits the job of sockets exclusively for the role of communication alongside legacy systems when no higher-level protocol is available. Authoring your ain communication protocol requires wrestling alongside hard safety issues, including:
- In-band versus out-of-band signaling
- Compatibility betwixt protocol versions
- Channel security
- Error handling
- Network constraints (firewalls)
- Session management
Many of the same issues apply to a custom implementation of a criterion protocol. While at that topographic point are unremarkably to a greater extent than resources available that address safety concerns related to implementing a criterion protocol, these resources are every bit good available to attackers.
Btw, Java EE8 has introduced some novel server force technologies, y'all tin john see courses)
Thanks for reading this article hence far. If y'all similar this article together with hence delight percentage alongside your friends together with colleagues. If y'all receive got whatever questions or feedback together with hence delight driblet a note.
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