What exception to throw when an important parameter/dependency is missing?

Posted by Pentium10 on Stack Overflow See other posts from Stack Overflow or by Pentium10
Published on 2010-03-25T17:36:12Z Indexed on 2010/03/25 17:43 UTC
Read the original article Hit count: 295

Filed under:

java

|

oop

|

exception

Take this method

public List<String> getGroups() {
    if (this.getId().equals("")) return null;
}

I would like to throw exception instead returning null, what's the exception to throw when an important parameter/dependency has not been set?

© Stack Overflow or respective owner

Related posts about java

Tomcat 6: Access Control Exception?

as seen on Server Fault - Search for 'Server Fault'
I'm trying to setup a tomcat6 server, and I'm trying to match another setup someone else established. However, my deployment (default Ubuntu install) uses a policy.d/ directory structure, and the established server just uses a catalina.policy file. I've tried setting every entry in policy.d to match… >>> More
Problem in creation MDB Queue connection at Jboss StartUp

as seen on Stack Overflow - Search for 'Stack Overflow'
I am not able to create a Queue connection in JBOSS4.2.3GA Version & Java1.5, as I am using MDB as per the below details. I am putting this MDB in a jar file(named utsJar.jar) and copied it in deploy folder of JBOSS, In the test env. this MDB works well but in another env. [ env settings and… >>> More
failing to establish connection between Postgres db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am using Postgres and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When I try to connect it gives "ClassNotFoundException". Here is what I get when I try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
failing to establish connection between postgre db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, For i am using postgre and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When i try to connect it gives "ClassNotFoundException". Here is what i get when i try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
Migration and deployement problems JBoss 4.2.2.GA to JBoss 6.0.0.M2

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to migrate an application running on JBoss 4.2.2.GA to JBoss 6.0.0.M2 I give you some log to explain my problem : boot.log : 2010-03-16 09:59:29,406 ERROR [org.jboss.system.server.profileservice.ProfileServiceBootstrap] (Thread-2) Failed to load profile: Summary of incomplete deployments… >>> More

Related posts about oop

php variable scope in oop

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I wonder if anyone can help out here, I'm trying to understand how use an objects properties across multiple non class pages,but I can't seem to be able to get my head around everything i have tried so far. For example a class called person; class person { static $name; } but i have… >>> More
Some solid OOP criticism?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi! I want to ask you to provide me with some articles (maybe books), which you possibly have found very convincing criticising the OOP methodology. I have read some in the WWW on this topic and I didn't really find a 'definitive demotivator'. It's not much about my personal attitude to the OOP… >>> More
I dont understand Access modifiers in OOP (JAVA)

as seen on Stack Overflow - Search for 'Stack Overflow'
I know this is a silly question but i don't understand Access Modifiers in OOP. Why do we make for example in JAVA instance variables private and then use public getter and setter methods to access them? I mean whats the reasoning/logic behind this? You still get to the instance variable but why use… >>> More
How can i handle a form submit using REAL OOP in PHP

as seen on Stack Overflow - Search for 'Stack Overflow'
Im used to java and creating UML.. and i was wondering how can PHP be OOP, the objects live only until you make a request.. then they destroy, so if im using a database is useless to create a class and add the members (variables) to the class, they will be useless.. i cant pass the main system object… >>> More
Do you need a good background in OOP before moving to frameworks?

as seen on Stack Overflow - Search for 'Stack Overflow'
Frameworks being all OOP, would it not be wise to go into frameworks without having a solid background in OOP? I can write basic classes but nothing too fancy or abstract. How much should I know of OOP before moving to frameworks? Right now I am PHP Object-Oriented Programming to learn OOP. >>> More