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Articles

  1. Create REST APIs with JAX-RS – REST API Tutorial
  2. Modeling REST Resources as Databases
  3. A Comparison of Spring MVC and JAX-RS
  4. Stay ahead with the world's most comprehensive technology and business learning platform.
  5. RESTful Java with JAX-RS 2.0, 2nd Edition by Bill Burke

The JAX-RS specification has defined strict sorting and precedence rules for matching URI expressions and is based on a most specific match wins algorithm. Expressions 1—3 come first because they all have more literal characters than expression 4. Although expressions 1—3 all have the same number of literal characters, expression 1 comes first because sorting rule 2 is triggered. It has more template expressions than either pattern 2 or 3. Expressions 2 and 3 have the same number of literal characters and same number of template expressions. Expression 2 is sorted ahead of 3 because it triggers sorting rule 3; it has a template pattern that is a regular expression.

Create REST APIs with JAX-RS – REST API Tutorial

These sorting rules are not perfect. If your application has URI matching ambiguities, your application design is probably too complicated and you need to revisit and refactor your URI scheme. It also reserves certain characters for its own specific use. In other words, you cannot use these characters as part of your URI segments. This is the set of allowable and reserved characters:. When creating Path expressions, you may encode its string, but you do not have to.

If you do have an encoding within your Path expression, the JAX-RS provider will leave it alone and treat it as an encoding when doing its request dispatching. One part of the URI specification that we have not touched on yet is matrix parameters. Matrix parameters are name-value pairs embedded within the path of a URI string.

The matrix parameter in this example comes after the URI segment e Its name is color and its value is black. Matrix parameters are different than query parameters, as they represent attributes of certain segments of the URI and are used for identification purposes.


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Think of them as adjectives. Query parameters, on the other hand, always come at the end of the URI and always pertain to the full resource you are referencing. It is actually illegal to specify matrix parameters within an Path expression. Matrix parameters are not considered part of the matching process because they are usually variable attributes of the request. JAX-RS also allows you to dynamically dispatch requests yourself through subresource locators.

Modeling REST Resources as Databases

This type of method returns an object that is, itself, a JAX-RS annotated service that knows how to dispatch the remainder of the request. This is best described using an example. This example will be a bit contrived, so please bear with me. We want to add this information to our URI scheme, but we want to decouple finding a database server from querying and formatting customer information. We can define a CustomerDatabaseResource class and have it delegate to our original CustomerResource class. The CustomerDatabaseResource class is our root resource.

A Comparison of Spring MVC and JAX-RS

It does not service any HTTP requests directly. It processes the database identifier part of the URI and locates the identified customer database. Once it does this, it allocates a CustomerResource instance, passing in a reference to the database. It will then match and process the remaining part of the request with the method CustomerResource.

Besides the added constructor, another difference in the CustomerResource class from previous examples is that it is no longer annotated with Path. It is no longer a root resource in our system; it is a subresource and must not be registered with the JAX-RS runtime within an Application class. While our previous example does illustrate the concept of subresource locators, it does not show their full dynamic nature.

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The CustomerDatabaseResource. One database uses a numeric key, as we talked about before. The other uses first and last name as a composite key. We would need to have two different classes to extract the appropriate information from the URI. Instead of our getDatabase method returning a CustomerResource , it will return any java.

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JAX-RS will introspect the instance returned to figure out how to dispatch the request. For this example, if our database is europe , we will use our original CustomerResource class to service the remainder of the request. If our database is northamerica , we will use a new subresource class FirstLastCustomerResource :. This type of pattern gives you a lot of freedom to dispatch your own requests.


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  5. First of all, the specification requires that potential JAX-RS class matches are filtered first based on the root Path annotation. Consider the following two classes:. The matching algorithm then tries to match the remainder of the URI based on expressions contained in the Resource1 class. If you expect that the Resource2. If we change Resource2 as follows, the request would be processed by the options method:. If the Path expressions are the same between two different JAX-RS classes, then they both are used for request matching. There are also similar ambiguities in subresource locator matching.

    RESTful Java with JAX-RS 2.0, 2nd Edition by Bill Burke

    Take these classes, for example:. The specification algorithm states that if there is at least one other resource method whose Path expression matches, then no subresource locator will be traversed to match the request. In this chapter, we examined the intricacies of the javax. This is the stack trace: May Path; import javax. MediaType; import javax. Application; import javax.

    We haven't found the reason, it has disappered somehow magic. Please, refer to section 3. Standalone Resteasy in Servlet 3. Tested with Tomcat 8. Vaadin maven import abstract ui issue I should create a common vaadin project shared among two others. The child is a vaadin maven war project, extending the abstract ui class from the parent and implementing his abstract method.

    ServiceException: java. ClassNotFoundException: my. AbstractUI at org. PUT; import javax. ServletException: Servlet. Can some one please point out? All Jersey dependencies should use the same version, i. I am getting exception while accessing below webservice method through browser package com. PathParam; import javax. WebApplicationException: com. MessageException: A message body writer for Java class java. The error message is telling you that JAXRS doesn't know how to turn your int return value into plain text. Pretty dumb, you might think, but that's how it is.