Getting started with Solder is easy. All you need to do is put the API and implementation JARs on the classpath of your CDI application. The features provided by Solder will be enabled automatically.

Some additional configuration, covered at the end of this chapter, is required if you are using a pre-Servlet 3.0 environment.

<dependency>

   <groupId>org.jboss.solder</groupId>

   <artifactId>solder-api</artifactId>

   <version>${solder.version}</version>

   <scope>compile</scope>

</dependency>



<dependency>

   <groupId>org.jboss.solder</groupId>

   <artifactId>solder-impl</artifactId>

   <version>${solder.version}</version>

   <scope>runtime</scope>

</dependency>

<dependency>

   <groupId>org.jboss.solder</groupId>

   <artifactId>seam-solder-impl</artifactId>

   <version>${solder.version}</version>

   <type>pom</type>

   <scope>import</scope>

</dependency>

<listener>

   <listener-class>org.jboss.solder.resourceLoader.servlet.ResourceListener</listener-class>

</listener>

Solder provides a number enhancements to the CDI programming model which are under trial and may be included in later releases of Contexts and Dependency Injection.

@Veto

class Utilities {

   ...

}

@Veto

package com.example;


import org.jboss.solder.core.Veto;

@Requires("javax.persistence.EntityManager")

class EntityManagerProducer {

   

   @Produces

   EntityManager getEntityManager() {

      ...

   }

   

}

interface PaymentService { 

   ...

}

class ChequePaymentService implements PaymentService { 

   ...

}

class CardPaymentService implements PaymentService { 

   ...

}

class PaymentProcessor { 

   

   @Inject @Exact(CardPaymentService.class)

   PaymentService paymentService;

   

   ...

   

}

@Named

package com.acme

package com.acme;

      

@FullyQualified @Named

public class NamedBean {

   public int getAge()

   {

      return 5;

   }

}

#{com.acme.namedBean.age}

@FullyQualified

package com.acme;

package com.acme;

      

@FullyQualified(ClassInOtherPackage.class) @Named

public class CustomNamespacedNamedBean {

   ...

}

Solder provides a complete set of AnnotationLiteral classes corresponding to the annotation types defined in the CDI (JSR-299) and Injection (JSR-330) specifications. These literals are located in the org.jboss.solder.literal package.

For any annotation that does not define an attribute, its corresponding AnnotationLiteral contains a static INSTANCE member. You should use this static member whenever you need a reference to an annotation instance rather than creating a new instance explicitly.

new AnnotatedTypeBuilder<X>().readFromType(type).addToClass(NamedLiteral.INSTANCE);

Literals are provided for the following annotations from Context and Dependency Injection (including annotations from Dependency Injection for Java):

Literals are also provided for the following annotations from Solder:

For more information about these annotations, consult the corresponding API documentation.

Solder provides a method to evaluate EL that is not dependent on JSF or JSP, a facility sadly missing in Java EE. To use it inject Expressions into your bean. You can evaluate value expressions, or method expressions. The Solder API provides type inference for you. For example:

class FruitBowl {

   

   @Inject Expressions expressions;

  

   public void run() {

      String fruitName = expressions.evaluateValueExpression("#{fruitBowl.fruitName}");

      Apple fruit = expressions.evaluateMethodExpression("#{fruitBown.getFruit}");

   }

}

Solder provides an extensible, injectable resource loader. The resource loader can provide URLs or managed input streams. By default the resource loader will look at the classpath, and the servlet context if available.

If the resource name is known at development time, the resource can be injected, either as a URL or an InputStream:

   @Inject

   @Resource("WEB-INF/beans.xml")

   URL beansXml;


   @Inject

   @Resource("WEB-INF/web.xml")

   InputStream webXml;

If the resource name is not known, the ResourceProvider can be injected, and the resource looked up dynamically:

   @Inject

   void readXml(ResourceProvider provider, String fileName) {

      InputStream is = provider.loadResourceStream(fileName);

   }

If you need access to all resources under a given name known to the resource loader (as opposed to first resource loaded), you can inject a collection of resources:

   @Inject

   @Resource("WEB-INF/beans.xml")

   Collection<URL> beansXmls;


   @Inject

   @Resource("WEB-INF/web.xml")

   Collection<InputStream> webXmls;

If the resource is a Properties bundle, you can also inject it as a set of Properties:

   @Inject

   @Resource("META-INF/aws.properties")

   Properties awsProperties;

class MyResourceLoader implements ResourceLoader {

   ...

}

Solder brings a fresh perspective to the ancient art of logging. Rather than just giving you an injectable version of the same old logging APIs, Solder goes the extra mile by embracing the type-safety of CDI and eliminating brittle, boilerplate logging statements. The best part is, no matter how you decide to roll it out, you still get to keep your logging engine of choice (for the logging wars will never end!).

Logger log = Logger.getLogger(Bean.class);

// log a plain text method

log.debug("I'm using JBoss Logging.");

Logger log = Logger.getLogger(Bean.class);

// log a message formatted using printf-style substitutions

log.infof("My name is %s.", "David");

// log a message formatted using MessageFormat-style substitutions

log.errorv("The license for Solder is the {0}", "APL");

import org.jboss.logging.Message;

import org.jboss.logging.LogMessage;

import org.jboss.logging.MessageLogger;


@MessageLogger

public interface CelebritySightingLog {


    @LogMessage @Message("Spotted celebrity %s!")

    void spottedCelebrity(String name);


}

import org.jboss.solder.messages.Message;

import org.jboss.solder.logging.Log;

import org.jboss.solder.logging.MessageLogger;


@MessageLogger

public interface TrainSpotterLog {


    @Log @Message("Spotted %s diesel trains")

    void dieselTrainsSpotted(int number);


}

    @Inject @Category("trains")

    private TrainSpotterLog log;

   log.dieselTrainsSpotted(7);

    @Inject @Category("trains") @Locale("en_GB")

    private TrainSpotterLog log;

import org.jboss.solder.messages.Message;

import org.jboss.solder.messages.Cause;

import org.jboss.solder.logging.Log;

import org.jboss.solder.logging.MessageLogger;


@MessageLogger

public interface TrainSpotterLog {


    @Log @Message("Failed to spot train %s")

    void missedTrain(String trainNumber, @Cause Exception exception);


}

try {

    ...

} catch (Exception e) {

    log.missedTrain("RH1", e);

}

TrainSpotterLog log = Logger.getMessageLogger(TrainSpotterLog.class, "trains");

log.dieselTrainsSpotted(7);

import javax.inject.Inject;


import org.jboss.solder.logging.Logger;


public class LogService {

    @Inject

    private Logger log;


    public void logMessage() {

        log.info("Hey sysadmins!");

    }

}

    @Inject @Category("billing")

    private Logger log;

    @Inject @TypedCategory(BillingService.class)

    private Logger log;

import org.jboss.solder.messages.Message;

import org.jboss.solder.messages.MessageBundle;


@MessageBundle

public interface TrainMessages {


    @Message("No trains spotted due to %s")

    String noTrainsSpotted(String cause);


}

    @Inject @MessageBundle

    private TrainMessages messages;

   throw new BadDayException(messages.noTrainsSpotted("leaves on the line"));

<dependencies>

    <!-- Annotation processor for generating typed logger and message bundle classes -->

    <dependency>

        <groupId>org.jboss.solder</groupId>

        <artifactId>solder-tooling</artifactId>

        <scope>provided</scope>

        <optional>true</optional>

    </dependency>

    ...

</dependencies>

<build>

    <plugins>

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-compiler-plugin</artifactId>

            <configuration>

                <source>1.6</source>

                <target>1.6</target>

            </configuration>

        </plugin>

    </plugins>

</build>

TrainSpotterLog_$logger.java
TrainSpotterLog_$logger_en_GB.java
TrainMessages_$bundle.java

TrainMessages.i18n_fr.properties

noTrainsSpotted=pas de trains repéré en raison de %s

TrainMessages_$bundle_fr.java

Invalid bundle interface org.example.log.AppLog (implementation not found)

ShrinkWrap.create(JavaArchive.class, "test.jar")
        .addPackage(AppLog.class.getPackage());

Solder provides a number of utility classes that make working with annotations and AnnotatedTypes easier. This chapter walks you through each utility, and gives you some ideas about how to use it. For more detail, take a look at the JavaDoc on each class.

AnnotatedTypeBuilder builder = new AnnotatedTypeBuilder()

        .readFromType(type, true) /* readFromType can read from an AnnotatedType or a class */

        .addToClass(ModelLiteral.INSTANCE); /* add the @Model annotation */

        .create()

AnnotatedType redefinedType = builder.create();

public <X> void processAnnotatedType(@Observes ProcessAnnotatedType<X> evt) {

    AnnotatedTypeBuilder builder = new AnnotatedTypeBuilder()

            .readFromType(evt.getAnnotatedType(), true)

            .addToClass(ModelLiteral.INSTANCE);

    evt.setAnnotatedType(builder.create());

}

AnnotatedTypeBuilder builder = new AnnotatedTypeBuilder()

        .readFromType(type, true)

        .redefine(Unique.class, new AnnotationRedefiner<Unique>() {


            public void redefine(RedefinitionContext<Unqiue> ctx) {

                ctx.getAnnotationBuilder().remove(Unique.class);

            } 

        });

AnnotatedType redefinedType = builder.create();

@Retention(RetentionPolicy.RUNTIME)

public @interface MultipleMembers {

    int intMember();


    long longMember();


    short shortMember();


    float floatMember();


    double doubleMember();


    byte byteMember();


    char charMember();


    boolean booleanMember();


    int[] intArrayMember();

}

/* Create a new provider */

AnnotationInstanceProvider provider = new AnnotationInstanceProvider();


/* Set the value for each of attributes */

Map<String, Object> values = new HashMap<String, Object>();

values.put("intMember", 1);

values.put("longMember", 1);

values.put("shortMember", 1);

values.put("floatMember", 0);

values.put("doubleMember", 0);

values.put("byteMember", ((byte) 1));

values.put("charMember", 'c');

values.put("booleanMember", true);

values.put("intArrayMember", new int[] { 0, 1 });


/* Generate the instance */

MultipleMembers an = provider.get(MultipleMembers.class, values);

/* Discover all annotations on type which are meta-annotated @Constraint */

Set<Annotation> constraints = AnnotationInspector.getAnnotations(type, Constraint.class);


/* Load the annotation instance for @FacesValidator the annotation may declared on the type, */

/* or, if the type has any stereotypes, on the stereotypes */

FacesValidator validator = AnnotationInspector.getAnnotation(

        type, FacesValidator.class, true, beanManager);

// assuming you have a class..

@Model

public class User {

    ...

}


// Assume type represents the User class

assert AnnotationInspector.isAnnotationPresent(type, Named.class, beanManager);


// Retrieves the underlying @Named instance on the stereotype

Named name = AnnotationInspector.getAnnotation(type, Named.class, true, beanManager);

/* Create a provider, giving it a unique namespace */

Synthetic.Provider provider = new Synthetic.Provider("com.acme");


/* Get the a synthetic qualifier for the original annotation instance */

Synthetic synthetic = provider.get(originalAnnotation);


/* Later calls with the same original annotation instance will return the same instance */

/* Alternatively, we can "get and forget" */


Synthetic synthetic2 = provider.get();

When developing a framework that builds on CDI, you may need to obtain the BeanManager for the application, you can't simply inject it as you are not working in an object managed by the container. The CDI specification allows lookup of java:comp/BeanManager in JNDI, however, some environments don't support binding to this location (e.g. servlet containers such as Tomcat and Jetty) and some environments don't support JNDI (e.g. the Weld SE container). For this reason, most framework developers will prefer to avoid a direct JNDI lookup.

Often it is possible to pass the correct BeanManager to the object in which you require it, for example via a context object. For example, you might be able to place the BeanManager in the ServletContext, and retrieve it at a later date.

On some occasions however there is no suitable context to use, and in this case, you can take advantage of the abstraction over BeanManager lookup provided by Solder. To lookup up a BeanManager, you can extend the abstract BeanManagerAware class, and call getBeanManager():

public class WicketIntegration extends BeanManagerAware {


   public WicketManager getWicketManager() {

      Bean<?> bean = getBeanManager().getBeans(IRequestListener.class);

      ... // and so on to lookup the bean

   }

   

}

The benefit here is that BeanManagerAware class will first look to see if its BeanManager injection point was satisfied before consulting the providers. Thus, if injection becomes available to the class in the future, it will automatically start the more efficient approach.

Occasionally you will be working in an existing class hierarchy, in which case you can use the accessor on BeanManagerLocator. For example:

public class ResourceServlet extends HttpServlet {


   protected void doGet(HttpServletRequest req, HttpServletResponse resp) 

         throws ServletException, IOException {

      BeanManager beanManager = new BeanManagerLocator().getBeanManager();

      ...

   }

}

If this lookup fails to resolve a BeanManager, the BeanManagerUnavailableException, a runtime exception, will be thrown. If you want to perform conditional logic based on whether the BeanManager is available, you can use this check:

public class ResourceServlet extends HttpServlet {


   protected void doGet(HttpServletRequest req, HttpServletResponse resp) 

         throws ServletException, IOException {

      BeanManagerLocator locator = new BeanManagerLocator();

      if (locator.isBeanManagerAvailable()) {

         BeanManager beanManager = locator.getBeanManager();

         ... // work with the BeanManager

      }

      else {

         ... // work without the BeanManager

      }

   }

}

However, keep in mind that you can inject into Servlets in Java EE 6!! So it's very likely the lookup isn't necessary, and you can just do this:

public class ResourceServlet extends HttpServlet {


   @Inject

   private BeanManager beanManager;


   protected void doGet(HttpServletRequest req, HttpServletResponse resp) 

         throws ServletException, IOException {

      ... // work with the BeanManager

   }

}

Solder provides a number of base classes which can be extended to create custom beans. Solder also provides bean builders which can be used to dynamically create beans using a fluent API.

The use of these classes is in general trivially understood with an understanding of basic programming patterns and the CDI specification, so no in depth explanation is provided here. The JavaDoc for each class and method provides more detail.

Properties are a convenient way of locating and working with JavaBean properties. They can be used with properties exposed via a getter/setter method, or directly via the field of a bean, providing a uniform interface that allows you all properties in the same way.

Property queries allow you to interrogate a class for properties which match certain criteria.

class Person {

   

   PersonName personName;

   

   Address address;

   

   void setPostcode(String postcode) {

      address.setPostcode(postcode);

   }

   

   String getPostcode() {

      return address.getPostcode();

   }

   

}

   Property<PersonName> personNameProperty = Properties.createProperty(Person.class.getField("personName"));

   Property<String> postcodeProperty = Properties.createProperty(Person.class.getMethod("getPostcode"));

   PropertyQuery<?> query = PropertyQueries.createQuery(Foo.class);

   PropertyQuery<String> query = PropertyQueries.<String>createQuery(identityClass);

   public class Foo {  
      private String accountNumber;
      private @Scrambled String accountPassword;    
      private String accountName;    
   }

   PropertyQuery<String> query = PropertyQueries.<String>createQuery(Foo.class)
      .addCriteria(new AnnotatedPropertyCriteria(Scrambled.class));

public class Foo {
   public String getBar() {
      return "foobar";
   }
}

   PropertyQuery<String> query = PropertyQueries.<String>createQuery(Foo.class)
      .addCriteria(new NamedPropertyCriteria("bar"));

public class Foo {
   private Bar bar;
}

PropertyQuery<Bar> query = PropertyQueries.<Bar>createQuery(Foo.class)
      .addCriteria(new TypedPropertyCriteria(Bar.class));

public class WholeNumberPropertyCriteria implements PropertyCriteria {
   public boolean fieldMatches(Field f) {
      return f.getType() == Integer.class || f.getType() == Integer.TYPE.getClass() ||
             f.getType() == Long.class || f.getType() == Long.TYPE.getClass() ||
             f.getType() == BigInteger.class;
   }   

   public boolean methodMatches(Method m) {
      return m.getReturnType() == Integer.class || m.getReturnType() == Integer.TYPE.getClass() ||
             m.getReturnType() == Long.class || m.getReturnType() == Long.TYPE.getClass() ||
             m.getReturnType() == BigInteger.class;
   }
}

   List<Property<String>> results = PropertyQueries.<String>createQuery(Foo.class)
     .addCriteria(new TypedPropertyCriteria(String.class))
     .getResultList();

   Property<String> result = PropertyQueries.<String>createQuery(Foo.class)
      .addCriteria(new NamedPropertyCriteria("bar"))
      .getFirstResult();

   Property<String> result = PropertyQueries.<String>createQuery(Foo.class)
      .addCriteria(new NamedPropertyCriteria("bar"))
      .getSingleResult();

Unwrapping producer methods allow you to create injectable objects that have "self-managed" lifecycles. An unwrapped injectable object is useful if you need a bean whose lifecycle does not exactly match one of the lifecycles of the existing scopes. The lifecycle of the bean is managed by the bean that defines the producer method, and changes to the unwrapped object are immediately visible to all clients.

You can declare a method to be an unwrapping producer method by annotating it @Unwraps. The return type of the managed producer must be proxyable (see Section 5.4.1 of the CDI specification, "Unproxyable bean types"). Every time a method is called on unwrapped object the invocation is forwarded to the result of calling the unwrapping producer method - the unwrapped object.

For example consider a permission manager (that manages the current permission), and a security manager (that checks the current permission level). Any changes to permission in the permission manager are immediately visible to the security manager.

@SessionScoped

class PermissionManager {

   

   Permission permission;

  

   void setPermission(Permission permission) {

      this.permission=permission;

   }

  

   @Unwraps @Current

   Permission getPermission() {

      return this.permission;

   }

}

@SessionScoped

class SecurityManager {

   

   @Inject @Current

   Permission permission;

  

   boolean checkAdminPermission() {

      return permission.getName().equals("admin");

   }


}

When permission.getName() is called, the unwrapped Permission forwards the invocation of getName() to the result of calling PermissionManager.getPermission().

For example you could raise the permission level before performing a sensitive operation, and then lower it again afterwards:

public class SomeSensitiveOperation {

   

   @Inject

   PermissionManager permissionManager;

  

   public void perform() {

      try {

         permissionManager.setPermission(Permissions.ADMIN);

         // Do some sensitive operation

      } finally {

         permissionManager.setPermission(Permissions.USER);

      }

   }


}

Unwrapping producer methods can have parameters injected, including InjectionPoint (which represents) the calling method.

Suppose you have a situation where you want to provide a default implementation of a particular service and allow the user to override it as needed. Although this may sound like a job for an alternative, they have some restrictions that may make them undesirable in this situation. If you were to use an alternative it would require an entry in every beans.xml file in an application.

Developers consuming the extension will have to open up the any jar file which references the default bean, and edit the beans.xml file within, in order to override the service. This is where default beans come in.

Default beans allow you to create a default bean with a specified type and set of qualifiers. If no other bean is installed that has the same type and qualifiers, then the default bean will be installed.

Let's take a real world example - a module that allows you to evaluate EL (something that Solder provides!). If JSF is available we want to use the FunctionMapper provided by the JSF implementation to resolve functions, otherwise we just want to use a a default FunctionMapper implementation that does nothing. We can achieve this as follows:

@DefaultBean(FunctionMapper.class)

@Mapper

class FunctionMapperImpl extends FunctionMapper {


   @Override

   public Method resolveFunction(String prefix, String localName) {

      return null;

   }


}

And in the JSF module:

class FunctionMapperProvider {

   

   @Produces

   @Mapper

   FunctionMapper produceFunctionMapper() {

      return FacesContext.getCurrentInstance().getELContext().getFunctionMapper();

   }

}

If FunctionMapperProvider is present then it will be used by default, otherwise the default FunctionMapperImpl is used.

A producer method or producer field may be defined to be a default producer by placing the @DefaultBean annotation on the producer. For example:

class CacheManager {

   

   @DefaultBean(Cache.class)

   Cache getCache() {

      ...

   }

     

}

Any producer methods or producer fields declared on a default managed bean are automatically registered as default producers, with Method.getGenericReturnType() or Field.getGenericType() determining the type of the default producer. The default producer type can be overridden by specifying @DefaultBean on the producer method or field.

Many common services and API's require the use of more than just one class. When exposing these services via CDI, it would be time consuming and error prone to force the end developer to provide producers for all the different classes required. Generic beans provide a solution, allowing a framework author to provide a set of related beans, one for each single configuration point defined by the end developer. The configuration points specifies the qualifiers which are inherited by all beans in the set.

To illustrate the use of generic beans, we'll use the following example. Imagine we are writing an extension to integrate our custom messaging solution "ACME Messaging" with CDI. The ACME Messaging API for sending messages consists of several interfaces:

We want to be able to create as many MessageQueue configurations as they need, however we do not want to have to declare each producer and the associated plumbing for every queue. Generic beans are an ideal solution to this problem.

class MyMessageQueues {

   

   @Produces

   @ACMEQueue("defaultQueue")

   MessageSystemConfiguration defaultQueue = new MessageSystemConfiguration();

   

   @Produces @Durable @ConversationScoped

   @ACMEQueue("durableQueue")

   MessageSystemConfiguration producerDefaultQueue() {

      MessageSystemConfiguration config = new MessageSystemConfiguration();

      config.setDurable(true);

      return config;

   }

}

class MessageLogger {

  

   @Inject

   MessageDispatcher dispatcher;

  

   void logMessage(Payload payload) {

      /* Add metaddata to the message */

      Collection<Header> headers = new ArrayList<Header>();

      ... 

      Message message = new Message(headers, payload);

      dispatcher.send(message);

   }

  

}

class DurableMessageLogger {

  

   @Inject @Durable

   MessageDispatcher dispatcher;

   

   @Inject @Durable

   DispatcherPolicy policy;

   

         

   /* Tweak the dispatch policy to enable duplicate removal */

   @Inject

   void tweakPolicy(@Durable DispatcherPolicy policy) {

      policy.removeDuplicates();

   }

  

   void logMessage(Payload payload) {

      ...

   }

}

@Durable @ConversationScoped

@ACMEQueue("durableQueue")

class DurableQueueConfiguration extends MessageSystemConfiguration {

      

   public DurableQueueConfiguration()

   {

      this.durable = true;

   }

}

<my:MessageSystemConfiguration>

   <my:Durable/>

   <s:ConversationScoped/>

   <my:ACMEQueue>durableQueue</my:ACMEQueue>

   <my:durable>true</my:durable>

</my:MessageSystemConfiguration>

@Retention(RUNTIME)

@GenericType(MessageSystemConfiguration.class)

@interface ACMEQueue {


   String value();

   

}

@GenericConfiguration(ACMEQueue.class) @ApplyScope

class QueueManager {


   @Inject @Generic

   MessageSystemConfiguration systemConfig;

   

   @Inject

   ACMEQueue config;

   

   MessageQueueFactory factory;

   

   @PostConstruct

   void init() {

      factory = systemConfig.createMessageQueueFactory();

   }

   

   @Produces @ApplyScope

   public MessageQueue messageQueueProducer() {

      return factory.createMessageQueue(config.name());

   }

}

@Generic

class MessageManager {


   @Inject @Generic

   MessageQueue queue;

   

   @Produces @ApplyScope

   MessageDispatcher messageDispatcherProducer() {

      return queue.createMessageDispatcher();

   }

   

   @Produces

   DispatcherPolicy getPolicy() {

      return queue.getDispatcherPolicy();

   }   

   

}

The service handler facility allow you to declare interfaces and abstract classes as automatically implemented beans. Any call to an abstract method on the interface or abstract class will be forwarded to the invocation handler for processing.

If you wish to convert some non-type-safe lookup to a type-safe lookup, then service handlers may be useful for you, as they allow the end user to map a lookup to a method using domain specific annotations.

We will work through using this facility, taking the example of a service which can execute JPA queries upon abstract method calls. First we define the annotation used to mark interfaces as automatically implemented beans. We meta-annotate it, defining the invocation handler to use:

@ServiceHandlerType(QueryHandler.class)

@Retention(RUNTIME)

@Target({TYPE})

@interface QueryService {}

We now define an annotation which provides the query to execute:

@Retention(RUNTIME)

@Target({METHOD})

@interface Query {


   String value();

   

}

And finally, the invocation handler, which simply takes the query, and executes it using JPA, returning the result:

class QueryHandler {

   

   @Inject EntityManager em;

  

   @AroundInvoke

   Object handle(InvocationContext ctx) {

      return em.createQuery(ctx.getMethod().getAnnotation(Query.class).value()).getResultList();

   }

}

Finally, we can define (any number of) interfaces which define our queries:

@QueryService

interface UserQuery {

   

   @Query("select u from User u")

   public List<User> getAllUsers();

}

Finally, we can inject the query interface, and call methods, automatically executing the JPA query.

class UserListManager {

   @Inject 

   UserQuery userQuery;

  

   List<User> users;

   

   @PostConstruct

   void create() {

      users=userQuery.getAllUsers();

   }


}

Solder provides a method for configuring CDI beans using alternate metadata sources, such as XML configuration. Currently, the XML provider is the only alternative available. Using a "type-safe" XML syntax, it is possible to add new beans, override existing beans, and add extra configuration to existing beans.

class Report {

 String filename;

 

 @Inject

 Datasource datasource;

 

 //getters and setters

}

interface Datasource {

 public Data getData();

}


@SalesQualifier

class SalesDatasource implements Datasource {

  public Data getData()

  {

   //return sales data

  }

}


class BillingDatasource implements Datasource {

  public Data getData()

  {

   //return billing data

  }

}

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://java.sun.com/xml/ns/javaee"

ml_plain">       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

ml_plain">       xmlns:s="urn:java:ee" 

       xmlns:r="urn:java:org.example.reports">

ml_plain">

ml_plain">  <r:Report>

ml_plain">   <s:modifies/>

   <r:filename>sales.jrxml<r:filename>

ml_plain">   <r:datasource>

    <r:SalesQualifier/>

   </r:datasource>

  </r:Report>

ml_plain">   

ml_plain">  <r:Report filename="billing.jrxml">

   <s:replaces/>

ml_plain">   <r:datasource>

ml_plain">    <s:Inject/>

    <s:Exact>org.example.reports.BillingDatasource</s:Exact>

   </r:datasource>

   </r:Report>   

</beans>

mvn -Pjetty jetty:run