3 days ago I completed the Arquillian "getting started" guide and decided that this would be a good thing to use for unit testing of my part of a CQRS system.I have googled for the past 3 days and the issue it not resolved by any of the solutions that have worked for others.Intention is to later add a filter to reduce the number of event received.I have built this code and driven it from a timer generating event topic posts and it all works fine.The trouble with that is a quality requirement to have cobertura report 80% code coverage by unit tests. .

DeltaSpike and Weld 2.1.2 causes Could not find...| JBoss.org

The exception message is: Could not find beans for Type=class org.apache.deltaspike.core.impl.scope.window.WindowBeanHolder and qualifiers:[].I've made a test case to sort out my problem: https://github.com/oranheim/ds-weld-test. .

Wled 2.1.2: Could not find beans for Type=class org.apache

The exception message is: Could not find beans for Type=class org.apache.deltaspike.core.impl.scope.window.WindowBeanHolder and qualifiers:[] Is DS compatible with Weld 2.1.2?Br, Ove Feb 20, 2014 9:01:50 AM org.jboss.weld.bootstrap.WeldStartup INFO: WELD-000900: 2.1.2 (Final) Feb 20, 2014 9:01:51 AM org.jboss.weld.event.ExtensionObserverMethodImpl checkRequiredTypeAnnotations WARN: WELD-000411: Observer method [BackedAnnotatedMethod] protected org.apache.deltaspike.core.impl.exclude.extension.ExcludeExtension.vetoBeans(@Observes ProcessAnnotatedType, BeanManager) receives events for all annotated types. .

Spring Bean Autowiring

You have to explicitly set the dependencies using tags in bean definitions.When autowiring a property in a bean, the property name is used for searching a matching bean definition in the configuration file.Read More : Autowire byName example byType This option enables the dependency injection based on bean types.When autowiring a property in bean, the property’s class type is used for searching a matching bean definition in the configuration file.In autowire enabled bean, it will look for class type of constructor arguments, and then do a autowire bytype on all constructor arguments.Please note that if there isn’t exactly one bean of the constructor argument type in the container, a fatal error is raised.Apart from the autowiring modes provided in the bean configuration file, autowiring can be specified in bean classes also using @Autowired annotation.To use @Autowired annotation in bean classes, you must first enable the annotation in the spring application using the below configuration.Now, when annotation configuration has been enabled, you are free to autowire bean dependencies using @Autowired , the way you like.When @Autowired is used on properties, it is equivalent to autowiring by ‘ byType ‘ in configuration file.As we learned that if we are using autowiring in ‘ byType ‘ mode and dependencies are looked for property class types.To resolve a specific bean using qualifier, we need to use @Qualifier annotation along with @Autowired annotation and pass the bean name in annotation parameter. .If you want to make specific bean autowiring non-mandatory for a specific bean property , use required=”false” attribute in @Autowired [email protected] (required=false) @Qualifier ("finance") private DepartmentBean departmentBean;.If you want to exclude some bean definitions so that they can not be injected through autowiring mode, you can do this using ‘ autowire-candidate ‘ set to false. Another option is to limit autowire candidates based on pattern-matching against bean names. . .

Chapter 3. Beans, BeanFactory and the ApplicationContext

Beans, BeanFactory and the ApplicationContext.The ApplicationContext builds on top of the BeanFactory (it's a subclass) and adds other functionality such as easier integration with Springs AOP features, message resource handling (for use in internationalization), event propagation, declarative mechanisms to create the ApplicationContext and optional parent contexts, and application-layer specific contexts such as the WebApplicationContext , among other enhancements.In general, an ApplicationContext is a complete superset of a BeanFactory, and any description of BeanFactory capabilities and behavior should be considered to apply to ApplicationContexts as well.Normally when building most applications in a J2EE-environment, the best option is to use the ApplicationContext, since it offers all the features of the BeanFactory and adds on to it in terms of features, while also allowing a more declarative approach to use of some functionality, which is generally desirable.The BeanFactory The BeanFactory is the actual container which instantiates, configures, and manages a number of beans.Although for most scenarios, almost all user code managed by the BeanFactory does not have to be aware of the BeanFactory, the BeanFactory does have to be instantiated somehow.Please see the chapter referenced above for much more information on the topic of Resource s. For many usage scenarios, user code will not have to instantiate the BeanFactory or ApplicationContext, since Spring Framework code will do it.However, if the bean is to be constructed by calling a static factory method instead of using a normal constructor, this will actually be the class name of the factory class.bean behavioral configuration elements, which state how the bean should behave in the container (i.e.

prototype or singleton, autowiring mode, dependency checking mode, initialization and destruction methods).constructor arguments and property values to set in the newly created bean.other beans a bean needs to do its work, i.e. collaborators (also specified as properties or as constructor arguments).These can also be called dependencies.Bean definition explanation Feature More info class Section 3.2.3, “The bean class” id and name Section 3.2.4, “The bean identifiers (id and name)” singleton or prototype Section 3.2.5, “To singleton or not to singleton” constructor arguments Section 3.3.1, “Setting bean properties and collaborators” bean properties Section 3.3.1, “Setting bean properties and collaborators” autowiring mode Section 3.3.6, “Autowiring collaborators” dependency checking mode Section 3.3.7, “Checking for dependencies” initialization method Section 3.4.1, “Lifecycle interfaces” destruction method Section 3.4.1, “Lifecycle interfaces” Note that a bean definition is represented by the real interface org.springframework.beans.factory.config.BeanDefinition , and its various implementations (Root/ChildBeanDefinition).Besides bean definitions which contain information on how to create a specific bean, a BeanFactory can also allow to register existing bean objects that have been created outside the factory (by custom code).The bean class The class attribute is normally mandatory (see Section 3.2.3.3, “Bean creation via instance factory method” and Section 3.5, “Abstract and child bean definitions” for the two exception) and is used for one of two purposes.In the much more common case where the BeanFactory itself directly creates the bean by calling its constructor (equivalent to Java code calling new), the class attribute specifies the class of the bean to be constructed.In the less common case where the BeanFactory calls a static, so-called factory method on a class to create the bean, the class attribute specifies the actual class containing the static factory method.(the type of the returned bean from the static factory method may be the same class or another class entirely, it doesn't matter).Bean creation via constructor When creating a bean using the constructor approach, all normal classes are usable by Spring and compatible with Spring.Using the XmlBeanFactory you can specify your bean class as follows: The mechanism for supplying (optional) arguments to the constructor, or setting properties of the object instance after it has been constructed, will be described shortly.Bean creation via static factory method When defining a bean which is to be created using a static factory method, along with the class attribute which specifies the class containing the static factory method, another attribute named factory-method is needed to specify the name of the factory method itself.Following is an example of a bean definition which specifies that the bean is to be created by calling a factory-method.Note that the definition does not specify the type (class) of the returned object, only the class containing the factory method. The mechanism for supplying (optional) arguments to the factory method, or setting properties of the object instance after it has been returned from the factory, will be described shortly.Bean creation via instance factory method Quite similar to using a static factory method to create a bean, is the use of an instance (non-static) factory method, where a factory method of an existing bean from the factory is called to create the new bean.The factory method itself should still be set via the factory-method attribute.Following is an example: ... Although the mechanisms for setting bean properties are still to be discussed, one implication of this approach is that the factory bean itself can be managed and configured via Dependency Injection, by the container.When a bean is a singleton, only one shared instance of the bean will be managed and all requests for beans with an id or ids matching that bean definition will result in that one specific bean instance being returned.The non-singleton, prototype mode of a bean deployment results in the creation of a new bean instance every time a request for that specific bean is done.Setting bean properties and collaborators Inversion of Control has already been referred to as Dependency Injection.The basic principle is that beans define their dependencies (i.e. the other objects they work with) only through constructor arguments, arguments to a factory method, or properties which are set on the object instance after it has been constructed or returned from a factory method.Beans defined in the BeanFactory that use setter-based dependency injection are true JavaBeans.constructor-based dependency injection is realized by invoking a constructor with a number of arguments, each representing a collaborator or property.Additionally, calling a static factory method with specific arguments, to construct the bean, can be considered almost equivalent, and the rest of this text will consider arguments to a constructor and arguments to a static factory method similarly.The BeanFactory supports both of these variants for injecting dependencies into beans it manages.(It in fact also supports injecting setter-based dependencies after some dependencies have already been supplied via the constructor approach.).However, most users of Spring will not be dealing with these classes directly (i.e.

programmatically), but rather with an XML definition file which will be converted internally into instances of these classes, and used to load an entire BeanFactory or ApplicationContext.Most Spring users use a BeanFactory or ApplicationContext variant which supports XML format configuration files.Each bean has dependencies expressed in the form of properties, constructor arguments, or arguments to the static-factory method when that is used instead of a normal constructor.Each property or constructor-arg is either an actual definition of the value to set, or a reference to another bean in the BeanFactory.In the case of the ApplicationContext, the reference can be to a bean in a parent ApplicationContext.Each property or constructor argument which is a value must be able to be converted from whatever format it was specified in, to the actual type of that property or constructor argument.When a bean property is a Java Class type, Spring allows you to specify the value for that property as a string value which is the name of the class, and the ClassEditor PropertyEditor, which is built-in, will take care of converting that class name to an actual Class instance.It is important to realize that Spring validates the configuration of each bean in the BeanFactory when the BeanFactory is created, including the validation that properties which are bean references are actually referring to valid beans (i.e. the beans being referred to are also defined in the BeanFactory, or in the case of ApplicationContext, a parent context).However, the bean properties themselves are not set until the bean is actually created.It will actually set properties and resolve dependencies (i.e.

create those dependencies if needed) as late as possible, which is when the bean is actually created.Now consider a variant of this where instead of using a constructor, Spring is told to call a static factory method to return an instance of the object.: 1 public class ExampleBean { ... // a private constructor private ExampleBean(...) { ...

} // a static factory method // the arguments to this method can be considered the dependencies of the bean that // is returned, regardless of how those arguments are actually used.Also, it is important to realize that the type of the class being returned by the factory method does not have to be of the same type as the class which contains the static factory method, although in this example it is.Constructor Argument Type Matching The above scenario can use type matching with simple types by explicitly specifying the type of the constructor argument using the type attribute.Bean properties and constructor arguments detailed As mentioned in the previous section, bean properties and constructor arguments can be defined as either references to other managed beans (collaborators), or values defined inline.The value element The value element specifies a property or constructor argument as a human-readable string representation.As mentioned in detail previously, JavaBeans PropertyEditors are used to convert these string values from a java.lang.String to the actual property or argument type.The collection elements The list , set , map , and props elements allow properties and arguments of Java type List , Set , Map , and Properties , respectively, to be defined and set.Inner bean definitions via nested bean elements A bean element inside the property element is used to define a bean value inline, instead of referring to a bean defined elsewhere in the BeanFactory.As mentioned in a previous section, the referred-to bean is considered to be a dependency of the bean who's property is being set, and will be initialized on demand as needed (if it is a singleton bean it may have already been initialized by the container) before the property is set.Specifying the target bean by using the bean attribute of the ref tag is the most general form, and will allow creating a reference to any bean in the same BeanFactory/ApplicationContext (whether or not in the same XML file), or parent BeanFactory/ApplicationContext. Specifying the target bean by using the parent attribute allows a reference to be created to a bean which is in a parent BeanFactory (or ApplicationContext) of the current BeanFactory (or ApplicationContext).In the XmlBeanFactory case, you instruct Spring to inject/override this method to return a particular bean from the container, by using the lookup-method element inside the bean definition.Arbitrary method replacement A less commonly useful form of method injection than Lookup Method Injection is the ability to replace arbitrary methods in a managed bean with another method implementation.In an XmlBeanFactory, the replaced-method element may be used to replace an existing method implementation with another, for a deployed bean.Consider the following class, with a method computeValue, which we want to override: ... public class MyValueCalculator { public String computeValue(String input) { ...

some real code } ... some other methods } A class implementing the org.springframework.beans.factory.support.MethodReplacer interface is needed to provide the new method definition.In a variation of this, sometimes a bean which is aware of the container is simply given the id of its dependency (using a string value or alternately the idref element, which evaluates the same as a string value).In either case, the dependency is properly initialized before the dependent bean.[1]In an XmlBeanFactory, the autowire mode for a bean definition is specified by using the autowire attribute of the bean element.Bean references must be defined via a ref element.byType Allows a property to be autowired if there is exactly one bean of the property type in the BeanFactory.If there are no matching beans, nothing happens; the property is not set.Note that explicit dependencies in property and constructor-arg elements always override autowiring.Autowire behavior can be combined with dependency checking, which will be performed after all autowiring has been completed.Autowiring by type will only work when there is a single bean definition of the type specified by the setter method or constructor argument.These are JavaBeans properties of the bean, which do not have actual values set for them in the bean definition, or alternately provided automatically by the autowiring feature.This feature is sometimes useful when you want to ensure that all properties (or all properties of a certain type) are set on a bean.Of course, in many cases a bean class will have default values for many properties, or some properties do not apply to all usage scenarios, so this feature is of limited use.In an XmlBeanFactory, this is specified via the dependency-check attribute in a bean definition, which may have the following values.Lifecycle interfaces Spring provides several marker interfaces to change the behavior of your bean in the BeanFactory.InitializingBean / init-method Implementing the org.springframework.beans.factory.InitializingBean allows a bean to perform initialization work after all necessary properties on the bean are set by the BeanFactory.*

This method allows the bean instance to perform initialization only * possible when all bean properties have been set and to throw an * exception in the event of misconfiguration.Important note: when deploying a bean in the prototype mode, the lifecycle of the bean changes slightly.BeanFactoryAware A class which implements the org.springframework.beans.factory.BeanFactoryAware interface is provided with a reference to the BeanFactory that created it, when it is created by that BeanFactory.BeanNameAware If a bean implements the org.springframework.beans.factory.BeanNameAware interface and is deployed in a BeanFactory, the BeanFactory will call the bean through this interface to inform the bean of the id it was deployed under.FactoryBean The org.springframework.beans.factory.FactoryBean interface is to be implemented by objects that are themselves factories.The FactoryBean interface provides three methods: Object getObject() : has to return an instance of the object this factory creates.Abstract and child bean definitions A bean definition potentially contains a large amount of configuration information, including container specific information (i.e.

initialization method, static factory method name, etc.).and constructor arguments and property values.In an XmlBeanFactory bean definition, a child bean definition is indicated simply by using the parent attribute, specifying the parent bean as the value of this attribute.A child bean definition will inherit constructor argument values, property values and method overrides from the parent, with the option to add new values.If init method, destroy method and/or static factory method are specified, they will override the corresponding parent settings.Trying to use such an abstract parent bean on its own (by referring to it as a ref property of another bean, or doing an explicit getBean() call with the parent bean id, will result in an error.Important Note: Application contexts (but not simple bean factories) will by default pre-instantiate all singletons.Therefore it is important (at least for singleton beans) that if you have a (parent) bean definition which you intend to use only as a template, and this definition specifies a class, you must make sure to set the abstract attribute to true, otherwise the application context will actually pre-instantiate it.You'll get a reference to the same bean if you defined it as a singleton (the default) or you'll get a new instance each time if you set singleton to false.The BeanFactory interface has only five methods for clients to call: boolean containsBean(String) : returns true if the BeanFactory contains a bean definition or bean instance that matches the given name.Depending on how the bean was configured by the BeanFactory configuration, either a singleton and thus shared instance or a newly created bean will be returned.Customizing beans with BeanPostProcessors A bean post-processor is a java class which implements the org.springframework.beans.factory.config.BeanPostProcessor interface, which consists of two callback methods.When such a class is registered as a post-processor with the BeanFactory, for each bean instance that is created by the BeanFactory, the post-processor will get a callback from the BeanFactory before any initialization methods (afterPropertiesSet and any declared init method) are called, and also afterwords.Customizing bean factories with BeanFactoryPostProcessors A bean factory post-processor is a java class which implements the org.springframework.beans.factory.config.BeanFactoryPostProcessor interface.At runtime, we will apply a PropertyPlaceholderConfigurer to the BeanFactory which will replace some properties of the datasource: The actual values come from another file in Properties format: jdbc.driverClassName=org.hsqldb.jdbcDriver jdbc.url=jdbc:hsqldb:hsql://production:9002 jdbc.username=sa jdbc.password=root To use this with a BeanFactory, the bean factory post-processor is manually executed on it: XmlBeanFactory factory = new XmlBeanFactory(new FileSystemResource("beans.xml")); PropertyPlaceholderConfigurer cfg = new PropertyPlaceholderConfigurer(); cfg.setLocation(new FileSystemResource("jdbc.properties")); cfg.postProcessBeanFactory(factory); Note that ApplicationContexts are able to automatically recognize and apply beans deployed in them which implement BeanFactoryPostProcessor.The PropertyPlaceHolderConfigurer doesn't only look for properties in the Properties file you specify, but also checks against the Java System properties if it cannot find a property you are trying to use.If an overriding Properties file does not have an entry for a certain bean property, the default context definition is used.Registering additional custom PropertyEditors When setting bean properties as a string value, a BeanFactory ultimately uses standard JavaBeans PropertyEditors to convert these Strings to the complex type of the property.To allow working in a more framework-oriented fashion, using layering and hierarchical contexts, the context package also provides the following: MessageSource, providing access to messages in, i18n-style.Using the MessageSource The ApplicationContext interface extends an interface called MessageSource , and therefore provides messaging (i18n or internationalization) functionality.Let's quickly review the methods defined there: String getMessage (String code, Object[] args, String default, Locale loc) : the basic method used to retrieve a message from the MessageSource.When an ApplicationContext gets loaded, it automatically searches for a MessageSource bean defined in the context.Spring currently provides two MessageSource implementations.Spring provides three standard events: Table 3.4.Customized behavior in the ApplicationContext The BeanFactory already offers a number of mechanisms to control the lifecycle of beans deployed in it (such as marker interfaces like InitializingBean or DisposableBean , their configuration only equivalents such as the init-method and destroy-method attributes in an XmlBeanFactory config, and bean post-processors.A bean which implements this interface and is deployed into the context will be called back on creation of the bean, using the interface's setApplicationContext() method, and provided with a reference to the context, which may be stored for later interaction with the context.In an ApplicationContext, any deployed bean which implements the above marker interface is automatically detected and registered as a bean post-processor, to be called appropriately at creation time for each bean in the factory.In an ApplicationContext, any deployed bean which implements the above marker interface is automatically detected as a bean factory post-processor, to be called at the appropriate time.This value may then be used in another bean definition as a property value or constructor argument.// will result in 10, which is the value of property 'age' of bean 'person' This form does mean that there is no choice in the name of the bean, any reference to it will also have to use the same id, which is the path.Additionally, it is sometimes necessary to set a property on a bean, as the result of a method call on another bean in the container, or a static method call on any arbitrary class.An example (in an XML based BeanFactory definition) of a bean definition which uses this class to force some sort of static initialization: com.example.MyClass.initialize ... Note that the definition for bean1 has used the depends-on attribute to refer to the force-init bean, which will trigger initializing force-init first, and thus calling the static initializer method, when bean1 is first initialized.Here's an example of a bean definition which uses this class to call a static factory method: com.whatever.MyClassFactory.getInstance An example of calling a static method then an instance method to get at a Java System property.Importing Bean Definitions from One File Into Another It's often useful to split up container definitions into multiple XML files.However, an alternate approach is to from one XML bean definition file, use one or more instances of the import element to load definitions from one or more other files.

.

D W S C

Leave a reply

your email address will not be published. required fields are marked *

Name *
Email *
Website