CODEWITHSUNDEEP
javarestderby
user970183
user970183

Reputation: 103

Expose database using REST web service

I'm developing an RESTful web service and I want to expose my data through it. I have a database (Derby), where I have two tables ('User' and 'Schedule').

Now, I want to type the name of the user and obtain their schedule. I can put the name using POST method, but I must check if the user is registered in the database and only then I send it's schedule.

I have created the entity classes and the session beans for the database.

In the web service, I have created two object from the type facade, like:

UserFacade user = new UserFacade();
ScheduleFacade schedule = new ScheduleFacade();

I assumed that I could use the entitymanager in the userfacade class, but always when I test the web service I receive a NullPointerException.

How can I access the database using the web service?

Upvotes: 0

Views: 1345

Answers (1)

aav
aav

Reputation: 2489

You will have to create a J2EE web application and deploy it into compatible servlet container (Tomcat, Jetty, etc).

There are several frameworks, that support RESTful services such as Jersey (http://jersey.java.net/) or Restlet (http://www.restlet.org/). Both of this frameworks have documentation and examples that are sufficient to get started.

Also, if my memory serves me well, Restlet framework has a small embeddable http server. So, initially you can avoid extra complexity with real J2EE web applications.

Upvotes: 1

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