Chapter 24. Migration Guide
Prev |  | Next

Links: Table of Contents | Single HTML

## Chapter 24. Migration Guide

## 24.1. Migrating from Jersey 2.4.1 to 2.5

### 24.1.1. Client-side API and SPI changes

- Client chunked encoding configuration behaviour has changed:

  Jersey client uses chunked encoding (streaming) for serialization of the entity as a default option. Before Jersey 2.5 release entity buffering has been used by default. The size of the chunk can still be controlled by ClientProperties.CHUNKED_ENCODING_SIZE property, this property however no longer enforces the use of chunked encoding. To control request entity buffering and chunked transfer coding selection, please utilize use the new ClientProperties.REQUEST_ENTITY_PROCESSING property. The behaviour of the property is however not unified across the available Connector implementations and depends on the connector implementation configured for the Client instance. Default connector produced by HttpUrlConnectorProvider still uses buffering as default options due to bugs in `HttpURLConnection`. On the other hand, Jetty HTTP Client based connectors produced by JettyConnectorProvider do not support chunked encoding at all.

  Please note that this is not a newly introduced limitation - it's merely an official acknowledgement of the fact that different connectors have different capabilities and limitations - something that has always been part of the individual connector implementations, it just was not publicly acknowledged.

- New ConnectorProvider SPI has been introduced to decouple Connector instantiation from Client instance boot-strapping. As such, the `connector(Connector)` method has been removed from ClientConfig API. It has been replaced with a newly introduced `connectorProvider(ConnectorProvider)` method.

- `org.glassfish.jersey.client.HttpUrlConnector` has been removed from the public API. HttpUrlConnectorProvider should be used to produce HttpURLConnection connector instances instead.

- `ClientProperties.HTTP_URL_CONNECTION_SET_METHOD_WORKAROUND` property has been moved to the new HttpUrlConnectorProvider has been introduced in Jersey 2.4) has been moved to the new HttpUrlConnectorProvider class as this property is specific to the connector instances created by `HttpUrlConnectorProvider` only. The property has been also renamed to HttpUrlConnector.SET_METHOD_WORKAROUND. The name of the property remains the same - `jersey.config.client.httpUrlConnection.setMethodWorkaround`.

- `ClientProperties.HTTP_URL_CONNECTOR_FIX_LENGTH_STREAMING` property (that class as this property is specific to the connector instances created by `HttpUrlConnectorProvider` only. The property has been also renamed to HttpUrlConnectorProvider.USE_FIXED_LENGTH_STREAMING and the new property name is `jersey.config.client.httpUrlConnector.useFixedLengthStreaming`.

- `org.glassfish.jersey.grizzly.connector.GrizzlyConnector` has been removed from the public API. GrizzlyConnectorProvider should be used to produce Grizzly Asynchronous HTTP Client connector instances instead.

- Public constructor has been removed from the ApacheConnector API. ApacheConnectorProvider should be used to provide Apache HTTP Client connector instances instead.

- Public constructor has been removed from the JettyConnector API. JettyConnectorProvider should be used to provide Jetty HTTP Client connector instances instead.

- Renamed property `CACHING_TEMPLATES_ENABLED` in MustacheMvcFeature from `jersey.config.server.mvc.caching.mustache.enabled` to `jersey.config.server.mvc.caching.mustache`.

- Authentication filters `org.glassfish.jersey.client.filter.HttpBasicAuthFilter` and `org.glassfish.jersey.client.filter.HttpDigestAuthFilter` were deprecated and replaced by HttpAuthenticationFeature.

### 24.1.2. Other changes

- The ContainerLifecycleListener invokes event `onStartup` and `onShutdown` also when application is being started or stopped because of application redeploy. The interface was marked as a Beta now.

- The monitoring statistics method `ApplicationStatistics.getDestroyTime()` is deprecated and returns always null. Use ContainerLifecycleListener to listen on application destroy and get the destroy time.

- `org.glassfish.jersey.spi.ResponseExecutorsProvider` contract has been completely removed from the Jersey SPI as it was inconsistently used by Jersey runtime and we did not find a suitable use case where a custom response executor would make sense. While we have no indication that the removed SPI is used in the Jersey community, please do not hesitate to contact us in case you think that you have a valid use case where the use of a custom response executor makes sense.

- `org.glassfish.jersey.spi.RequestsExecutorsProvider` contract has been renamed to RequestExecutorProvider. It has been also extended with an additional `releaseRequestingExecutor` method to address executor shutdown handling issues reported in JERSEY-2205. As such, any custom implementation of the SPI is now required to implement the new method.

## 24.2. Migrating from Jersey 2.4 to 2.4.1

- The unsupported `ClientProperties.BUFFER_RESPONSE_ENTITY_ON_EXCEPTION` property, with value of `jersey.config.client.bufferResponseEntityOnException`, has been removed from the API. Since Jersey 2.4 where JERSEY-2157 issue has been fixed, Jersey client runtime automatically buffers error response entities. This behavior is automatic and there is no need to set any property.

## 24.3. Migrating from Jersey 2.3 to 2.4

- All deprecated SSE InboundEvent `getData(...)` methods have been removed from the API. Use the new `readData(...)` methods have been introduced instead in Jersey 2.3 for consistency with other parts of client-side JAX-RS API. Access to the raw SSE event data content is provided via a `InboundEvent`'s `byte[] getRawData()` method that has been too introduced in Jersey 2.3.

- All EJB and CDI integration classes have been moved into internal Jersey packages, to clearly state the integration code should not be used as a public API.

## 24.4. Migrating from Jersey 2.0, 2.1 or 2.2 to 2.3

- All existing SSE InboundEvent `getData(...)` methods have been made deprecated and new `readData(...)` methods have been introduced instead for consistency with other parts of client-side JAX-RS API. The deprecated `getData(...)` methods will be removed in Jersey 2.4. A new SSE InboundEvent `byte[] getRawData()` method has been introduced to provide access to the raw SSE event data content.

- Generic Broadcaster methods for adding/removing BroadcasterListener registrations have been renamed from `addBroadcasterListener/removeBroadcasterListener` to simply `add/remove`.

- Generic Broadcaster (and transitively, SseBroadcaster) `add/remove` methods - that are responsible for adding/removing BroadcasterListener and ChunkedOutput (or EventOutput) registrations - no longer try to avoid duplicate registrations by comparing hash code of the added/removed instance with the hash codes of already registered instances. This behavior has been identified as a potential source of hard to discover bugs and was removed as such. The issue with the former behavior was that hash codes as integer values provide only a very limited value space that could lead to false-positive duplicate registration rejections, especially with larger number of simultaneously connected SSE clients (represented by `ChunkedOutput` or `EventOutput` broadcaster registrations). Consequently, users who rely on the old registration behavior in their application code need to adapt the code to the revised behavior of `Broadcaster` `add/remove` methods.

## 24.5. Migrating from Jersey 1.x to 2.0

This chapter is a migration guide for people switching from Jersey 1.x. Since many of the Jersey 1.x features became part of JAX-RS 2.0 standard which caused changes in the package names, we decided it is a good time to do a more significant incompatible refactoring, which will allow us to introduce some more interesting new features in the future. As the result, there are many incompatibilities between Jersey 1.x and Jersey 2.0. This chapter summarizes how to migrate the concepts found in Jersey 1.x to Jersey/JAX-RS 2.0 concepts.

### 24.5.1. Server API

Jersey 1.x contains number of proprietary server APIs. This section covers migration of application code relying on those APIs.

#### 24.5.1.1. Injecting custom objects

Jersey 1.x have its own internal dependency injection framework which handles injecting various parameters into field or methods. It also provides a way how to register custom injection provider in Singleton or PerRequest scopes. Jersey 2.x uses HK2 as dependency injection framework and users are also able to register custom classes or instances to be injected in various scopes.

Main difference in Jersey 2.x is that you don't need to create special classes or providers for this task; everything should be achievable using HK2 API. Custom injectables can be registered at ResourceConfig level by adding new HK2 Module or by dynamically adding binding almost anywhere using injected HK2 Services instance.

Jersey 1.x Singleton:

    ResourceConfig resourceConfig = new DefaultResourceConfig();
    resourceConfig.getSingletons().add(
            new SingletonTypeInjectableProvider<Context, SingletonType>(
                    SingletonType.class, new SingletonType()) {});

Jersey 1.x PerRequest:

    ResourceConfig resourceConfig = new DefaultResourceConfig();
    resourceConfig.getSingletons().add(
            new PerRequestTypeInjectableProvider<Context, PerRequestType>() {
                @Override
                public Injectable<PerRequestType> getInjectable(ComponentContext ic, Context context) {
                    //...
                }
            });

Jersey 2.0 HK2 Module:

    public static class MyBinder extends AbstractBinder {

        @Override
        protected void configure() {
            // request scope binding
            bind(MyInjectablePerRequest.class).to(MyInjectablePerRequest.class).in(RequestScope.class);
            // singleton binding
            bind(MyInjectableSingleton.class).in(Singleton.class);
            // singleton instance binding
            bind(new MyInjectableSingleton()).to(MyInjectableSingleton.class);
        }

    }

    // register module to ResourceConfig (can be done also in constructor)
    ResourceConfig rc = new ResourceConfig();
    rc.addClasses(/* ... */);
    rc.addBinders(new MyBinder());

Jersey 2.0 dynamic binding:

    public static class MyApplication extends Application {

        @Inject
        public MyApplication(ServiceLocator serviceLocator) {
            System.out.println("Registering injectables...");

            DynamicConfiguration dc = Injections.getConfiguration(serviceLocator);

            // request scope binding
            Injections.addBinding(
            Injections.newBinder(MyInjectablePerRequest.class).to(MyInjectablePerRequest.class).in(RequestScoped.class),
                    dc);

            // singleton binding
            Injections.addBinding(
                    Injections.newBinder(MyInjectableSingleton.class)
                            .to(MyInjectableSingleton.class)
                            .in(Singleton.class),
                    dc);

            // singleton instance binding
            Injections.addBinding(
                    Injections.newBinder(new MyInjectableSingleton())
                            .to(MyInjectableSingleton.class),
                    dc);

            // request scope binding with specified custom annotation
            Injections.addBinding(
                    Injections.newBinder(MyInjectablePerRequest.class)
                            .to(MyInjectablePerRequest.class)
                            .qualifiedBy(new MyAnnotationImpl())
                            .in(RequestScoped.class),
                    dc);

            // commits changes
            dc.commit();
        }

        @Override
        public Set<Class<?>> getClasses() {
            return ...
        }}

#### 24.5.1.2. ResourceConfig Reload

In Jersey 1, the reload functionality is based on two interfaces:

1. com.sun.jersey.spi.container.ContainerListener
2. com.sun.jersey.spi.container.ContainerNotifier

Containers, which support the reload functionality implement the `ContainerListener` interface, so that once you get access to the actual container instance, you could call it's `onReload` method and get the container re-load the config. The second interface helps you to obtain the actual container instance reference. An example on how things are wired together follows.

Example 24.1. Jersey 1 reloader implementation

    public class Reloader implements ContainerNotifier {
        List<ContainerListener> ls;

        public Reloader() {
            ls = new ArrayList<ContainerListener>();
        }

        public void addListener(ContainerListener l) {
            ls.add(l);
        }

        public void reload() {
            for (ContainerListener l : ls) {
                l.onReload();
            }
        }
    }

Example 24.2. Jersey 1 reloader registration

    Reloader reloader = new Reloader();
    resourceConfig.getProperties().put(ResourceConfig.PROPERTY_CONTAINER_NOTIFIER, reloader);

In Jersey 2, two interfaces are involved again, but these have been re-designed.

1. org.glassfish.jersey.server.spi.Container
2. org.glassfish.jersey.server.spi.ContainerLifecycleListener

The `Container` interface introduces two `reload` methods, which you can call to get the application re-loaded. One of these methods allows to pass in a new `ResourceConfig` instance. You can register your implementation of `ContainerLifecycleListener` the same way as any other provider (i.e. either by annotating it by @Provider annotation or adding it to the Jersey ResourceConfig directly either using the class (using `ResourceConfig.addClasses()`) or registering a particular instance using `ResourceConfig.addSingletons()` method.

An example on how things work in Jersey 2 follows.

Example 24.3. Jersey 2 reloader implementation

    public class Reloader implements ContainerLifecycleListener {

        Container container;

        public void reload(ResourceConfig newConfig) {
            container.reload(newConfig);
        }

        public void reload() {
            container.reload();
        }

        @Override
        public void onStartup(Container container) {
            this.container = container;
        }

        @Override
        public void onReload(Container container) {
            // ignore or do whatever you want after reload has been done
        }

        @Override
        public void onShutdown(Container container) {
            // ignore or do something after the container has been shutdown
        }
    }

Example 24.4. Jersey 2 reloader registration

    Reloader reloader = new Reloader();
    resourceConfig.addSingletons(reloader);

#### 24.5.1.3. MessageBodyReaders and MessageBodyWriters ordering

JAX-RS 2.0 defines new order of MessageBodyWorkers - whole set is sorted by declaration distance, media type and source (custom providers having higher priority than default ones provided by Jersey). JAX-RS 1.x ordering can still be forced by setting parameter `MessageProperties.LEGACY_WORKERS_ORDERING` (`"jersey.config.workers.legacyOrdering"`) to `true` in `ResourceConfig` or `ClientConfig` properties.

### 24.5.2. Migrating Jersey Client API

JAX-RS 2.0 provides functionality that is equivalent to the Jersey 1.x proprietary client API. Here is a rough mapping between the Jersey 1.x and JAX-RS 2.0 Client API classes:

Table 24.1. Mapping of Jersey 1.x to JAX-RS 2.0 client classes

Jersey 1.x Class | JAX-RS 2.0 Class | Notes
--- | --- | ---
com.sun.jersey.api.client.Client | ClientBuilder | For the static factory methods and constructors.
| Client | For the instance methods.
com.sun.jersey.api.client.WebResource | WebTarget |
com.sun.jersey.api.client.AsyncWebResource | WebTarget | You can access async versions of the async methods by calling `WebTarget.request().async()`

The following sub-sections show code examples.

#### 24.5.2.1. Making a simple client request

Jersey 1.x way:

    Client client = Client.create();
    WebResource webResource = client.resource(restURL).path("myresource/{param}");
    String result = webResource.pathParam("param", "value").get(String.class);

JAX-RS 2.0 way:

    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(restURL).path("myresource/{param}");
    String result = target.pathParam("param", "value").get(String.class);

#### 24.5.2.2. Registering filters

Jersey 1.x way:

    Client client = Client.create();
    WebResource webResource = client.resource(restURL);
    webResource.addFilter(new HTTPBasicAuthFilter(username, password));

JAX-RS 2.0 way:

    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(restURL);
    target.register(new HttpBasicAuthFilter(username, password));

#### 24.5.2.3. Setting "Accept" header

Jersey 1.x way:

    Client client = Client.create();
    WebResource webResource = client.resource(restURL).accept("text/plain");
    ClientResponse response = webResource.get(ClientResponse.class);

JAX-RS 2.0 way:

    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(restURL);
    Response response = target.request("text/plain").get();

#### 24.5.2.4. Attaching entity to request

Jersey 1.x way:

    Client client = Client.create();
    WebResource webResource = client.resource(restURL);
    ClientResponse response = webResource.post(ClientResponse.class, "payload");

JAX-RS 2.0 way:

    Client client = ClientBuilder.newClient();
    WebTarget target = client.target(restURL);
    Response response = target.request().post(Entity.text("payload"));

#### 24.5.2.5. Setting SSLContext and/or HostnameVerifier

Jersey 1.x way:

    HTTPSProperties prop = new HTTPSProperties(hostnameVerifier, sslContext);
    DefaultClientConfig dcc = new DefaultClientConfig();
    dcc.getProperties().put(HTTPSProperties.PROPERTY_HTTPS_PROPERTIES, prop);
    Client client = Client.create(dcc);

Jersey 2.0 way:

    Client client = ClientBuilder.newBuilder()
            .sslContext(sslContext)
            .hostnameVerifier(hostnameVerifier)
            .build();

Prev |  | Next
Chapter 23. Building and Testing Jersey | Home | Appendix A. Configuration Properties