Amadeus IT Group Most Frequently Asked Latest Advanced Java Interview Questions Answers
What Is The Infobus?
The InfoBus is a compact Java API which allows cooperating applets or Beans, on a Web page or in any other Java application, to communicate data to one another. The InfoBus architecture enables Beans to be categorized as "data providers" and "data consumers". Data providers are Beans whose primary function is to access data from their native store, such as a DBMS, spreadsheet, flat file, Lotus Notes database etc., and to offer data onto the InfoBus.
Data consumers retrieve data from the bus, for analysis or visual display. This segregation of provider from consumer is extremely powerful in that it enables applications to be independent of their data; for example, a charting Bean need not understand SQL or JDBC in order to access DBMS data.
Of course, a Bean can be both a consumer and provider: for example a spreadsheet may accept data from a DBMS and provide data to a chart Bean.
What Are/is Enterprise Javabeans?
Enterprise JavaBeans (EJB) is an API specification for building scalable, distributed, component-based, multi-tier applications. It leverages and extends the JavaBeans component model to provide a rich object-oriented transactional environment for developers building enterprise applications.
Enterprise JavaBeans (EJB) technology is the basis of Java 2 Platform, Enterprise Edition (J2EE). EJB technology provides the scalable architecture for executing business logic in a distributed computing environment. J2EE makes the life of an enterprise developer easier by combining the EJB component architecture with other enterprise technologies to solutions on the Java platform for seamless development and deployment of server side applications.
Who Is Developing The Javabeans Migration Assistant To Activex?
IBM and Taligent, its object oriented technology subsidiary, with support from JavaSoft, are developing a set of conversion conventions, a porting guide and tool that will allow developers to easily convert their Windows ActiveX components into JavaBeans.
Why Is The Javabeans Bridge For Activex Only Available On Windows/x86?
Sun's JavaBeans Bridge for ActiveX is platform specific due to the platform specific nature of ActiveX. Currently, ActiveX is essentially a Window/X86 platform specific component architecture.
If Microsoft delivers ActiveX libraries and ActiveX applications on other platforms, Sun will evaluate customer demand and respond accordingly.
What Is The Relation Between The Infobus And Rmi?
The InfoBus architecture addresses Beans talking to one in a single JVM not across multiple JVMs; while RMI (Remote Method Invocation) is intended for communication across JVMs (different Java Virtual Machines across the network). As for IIOP, one can envision a JavaBeans component that uses RMI to talk to something on another JVM and then publishes the data on the InfoBus.
Additionally, RMI could be used to allow components in different security classes to communicate within the same JVM.
Difference Between Java Beans And Enterprise Java Beans?
JavaBeans may be visible or nonvisible at runtime.For example, the visual GUI component may be a button,list box,graphic or a chart. An EJB is a nonvisual ,remote object.
JavaBeans are intended to be local to a single process and are primarly intended to run on the client side.Although one can develop server-side JavaBeans,it is far easier to develop them using the EJB specification instead. EJB's are remotely executable components or business objects that can be deployed only on the server.
JavaBeans is a component technology to create generic Java components that can be composed together into applets and applications.
Even though EJB is a component technology,it neither builds upon nor extends the original JavaBean specification.
JavaBeans have an external interface called the properties interface, which allows a builder tool to interpret the functionality of the bean. EJBs have a dployement descriptor that describes its functionality to an external builder tool or IDE
JavaBeans may have BeanInfo classes,property editors or customizers.
Is The Infobus Client Side Only?
Yes. InfoBus is typically used to communicate among Beans at the client, and it can also be useful for sharing information among components at a single server site. The initial version of InfoBus is not distributed, and is therefore not intended for transmission of data between clients and servers.
A variety of Java communication services, including JDBC, CORBA, and RMI can be used by InfoBus components for access to distributed data. For example, the ESuite Data Access component is a Bean that connects any JDBC compliant data source to the InfoBus. Once the data is on the bus, it can easily be imported by any InfoBus Data Consumer, such as a spreadsheet, chartingcomponent, word processor or data analysis tool.
Will The General Public Have Access To The Infobus Apis?
Yes, under the usual terms of the JDK license. The specification and technology preview are available in our products archive.
How Does The Infobus Relate To Javabeans?
The InfoBus specification extends JavaBeans by providing a set of enhanced interfaces to share and exchange dynamic data.
What Is Glasgow?
Glasgow - the code name for add-ins to the JavaBeans specification. It contains following specifications
To create the title property as a bound property for the MyBean component in the NetBeans GUI Builder, perform the following sequence of operations
Right-click the Bean Patterns node in the MyBean class hierarchy.
Select Add|Property from the pop-up menu.
Fill the New Property Pattern form and click OK.
What Is The Serializable Class In Java Beans?
Any class is serializable as long as that class or a parent class implements the java.io.Serializable interface. Examples of serializable classes include Component, String, Date, Vector, and Hashtable.
How To Control Serialization In Java Beans?
Three ways to control serilization in java beans
1.Automatic serialization, implemented by the Serializable interface. The Java serialization software serializes the entire object, except transient and static fields.
2.Customized serialization. Selectively exclude fields you do not want serialized by marking with the transient (or static) modifier.
3.Customized file format, implemented by the Externalizable interface and its two methods. Beans are written in a specific file format.
What Is Introspection Properties In Java Beans?
Introspection is the automatic process of analyzing a bean's design patterns to reveal the bean's properties, events, and methods.
What Are Introspection Api In Java Beans?
The JavaBeans API architecture supplies a set of classes and interfaces to provide introspection. The BeanInfo (in the API reference documentation) interface of the java.beans package defines a set of methods that allow bean implementors to provide explicit information about their beans. By specifying BeanInfo for a bean component, a developer can hide methods, specify an icon for the toolbox, provide descriptive names for properties, define which properties are bound properties, and much more.
The getBeanInfo(beanName) (in the API reference documentation) of the Introspector (in the API reference documentation) class can be used by builder tools and other automated environments to provide detailed information about a bean. The getBeanInfo method relies on the naming conventions for the bean's properties, events, and methods. A call to getBeanInfo results in the introspection process analyzing the bean?s classes and superclasses.
What Is Bean Customization?
Customization provides a means for modifying the appearance and behavior of a bean within an application builder so it meets your specific needs. There are several levels of customization available for a bean developer to allow other developers to get maximum benefit from a bean?s potential functionality.
1.By using a property editor. Each bean property has its own property editor. The NetBeans GUI Builder usually displays a bean's property editors in the Properties window. The property editor that is associated with a particular property type edits that property type.
2. By using customizers. Customizers give you complete GUI control over bean customization. Customizers are used where property editors are not practical or applicable. Unlike a property editor, which is associated with a property, a customizer is associated with a bean.
What Is Ejb Container?
A container that implements the EJB component contract of the J2EE architecture. This contract specifies a runtime environment for enterprise beans that includes security, concurrency, life-cycle management, transactions, deployment, naming, and other services. An EJB container is provided by an EJB or J2EE server.
What Is Ejb Context?
A vendor that supplies an EJB container. An object that allows an enterprise bean to invoke services provided by the container and to obtain the information about the caller of a client-invoked method.
What Is Ejb Home Object?
An object that provides the life-cycle operations (create, remove, find) for an enterprise bean. The class for the EJB Home object is generated by the container's deployment tools. The EJB Home object implements the enterprise bean's Home interface. The client references an EJB Home object to perform life-cycle operations on an EJB object. The client uses JNDI to locate an EJB Home object.
What Is Ejb Object?
An object whose class implements the enterprise bean's remote interface. A client never references an enterprise bean instance directly. A client always references an EJB object. The class of an EJB object is generated by a container's deployment tools.
What Is Entity Bean?
An enterprise bean that represents persistent data maintained in a database. An entity bean can manage its own persistence or can delegate this function to its container. An entity bean is identified by a primary key. If the container in which an entity bean is hosted crashes, the entity bean, its primary key, and any remote references survive the crash.
What Is Ejb Server?
Software that provides services to an EJB container. For example, an EJB container typically relies on a transaction manager that is part of the EJBserver to perform the two-phase commit across all the participating resource managers. The J2EE architecture assumes that an EJB container is hosted by an EJBserver from the same vendor, so it does not specify the contract between these two entities. An EJB server can host one or more EJB containers.
What Is Enterprise Information System?
The applications that constitute an enterprise's existing system for handling companywide information. These applications provide an information infrastructure for an enterprise. An enterpriseinformation system offers a well-defined set of services to its clients. These services are exposed to clients as local or remote interfaces or both. Examples of enterprise information systems include enterprise resource planning systems, mainframe transaction processing systems, and legacy database systems.
What Is Enterprise Javabeans?
A component architecture for the development and deployment of object-oriented, distributed, enterprise-level applications. Applications written using the Enterprise JavaBeans architecture are scalable, transactional, and secure.
What Is Enterprise Javabeans Query Language?
Defines the queries for the finder and select methods of an entity bean having container-managed persistence. A subset of SQL92, EJB QL has extensions that allow navigation over the relationships defined in an entity bean's abstract schema.
What Is Enterprise Bean Provider?
An application developer who produces enterprise bean classes, remote and Interview questions - Home interfaces, and deployment descriptor files, and packages them in an EJB JAR file.
What Is An Entity?
A distinct, individual item that can be included in an XML document by referencing it. Such an entity reference can name an entity as small as a character (for example, <, which references the less-than symbol or left angle bracket, <). An entity reference can also reference an entire document, an external entity, or a collection of DTD definitions.
What Is The Infobus?
The InfoBus is a compact Java API which allows cooperating applets or Beans, on a Web page or in any other Java application, to communicate data to one another. The InfoBus architecture enables Beans to be categorized as "data providers" and "data consumers". Data providers are Beans whose primary function is to access data from their native store, such as a DBMS, spreadsheet, flat file, Lotus Notes database etc., and to offer data onto the InfoBus.
Data consumers retrieve data from the bus, for analysis or visual display. This segregation of provider from consumer is extremely powerful in that it enables applications to be independent of their data; for example, a charting Bean need not understand SQL or JDBC in order to access DBMS data.
Of course, a Bean can be both a consumer and provider: for example a spreadsheet may accept data from a DBMS and provide data to a chart Bean.
What Are/is Enterprise Javabeans?
Enterprise JavaBeans (EJB) is an API specification for building scalable, distributed, component-based, multi-tier applications. It leverages and extends the JavaBeans component model to provide a rich object-oriented transactional environment for developers building enterprise applications.
Enterprise JavaBeans (EJB) technology is the basis of Java 2 Platform, Enterprise Edition (J2EE). EJB technology provides the scalable architecture for executing business logic in a distributed computing environment. J2EE makes the life of an enterprise developer easier by combining the EJB component architecture with other enterprise technologies to solutions on the Java platform for seamless development and deployment of server side applications.
Who Is Developing The Javabeans Migration Assistant To Activex?
IBM and Taligent, its object oriented technology subsidiary, with support from JavaSoft, are developing a set of conversion conventions, a porting guide and tool that will allow developers to easily convert their Windows ActiveX components into JavaBeans.
Why Is The Javabeans Bridge For Activex Only Available On Windows/x86?
Sun's JavaBeans Bridge for ActiveX is platform specific due to the platform specific nature of ActiveX. Currently, ActiveX is essentially a Window/X86 platform specific component architecture.
If Microsoft delivers ActiveX libraries and ActiveX applications on other platforms, Sun will evaluate customer demand and respond accordingly.
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| Amadeus IT Group Most Frequently Asked Latest Advanced Java Interview Questions Answers |
What Is The Relation Between The Infobus And Rmi?
The InfoBus architecture addresses Beans talking to one in a single JVM not across multiple JVMs; while RMI (Remote Method Invocation) is intended for communication across JVMs (different Java Virtual Machines across the network). As for IIOP, one can envision a JavaBeans component that uses RMI to talk to something on another JVM and then publishes the data on the InfoBus.
Additionally, RMI could be used to allow components in different security classes to communicate within the same JVM.
Difference Between Java Beans And Enterprise Java Beans?
JavaBeans may be visible or nonvisible at runtime.For example, the visual GUI component may be a button,list box,graphic or a chart. An EJB is a nonvisual ,remote object.
JavaBeans are intended to be local to a single process and are primarly intended to run on the client side.Although one can develop server-side JavaBeans,it is far easier to develop them using the EJB specification instead. EJB's are remotely executable components or business objects that can be deployed only on the server.
JavaBeans is a component technology to create generic Java components that can be composed together into applets and applications.
Even though EJB is a component technology,it neither builds upon nor extends the original JavaBean specification.
JavaBeans have an external interface called the properties interface, which allows a builder tool to interpret the functionality of the bean. EJBs have a dployement descriptor that describes its functionality to an external builder tool or IDE
JavaBeans may have BeanInfo classes,property editors or customizers.
Is The Infobus Client Side Only?
Yes. InfoBus is typically used to communicate among Beans at the client, and it can also be useful for sharing information among components at a single server site. The initial version of InfoBus is not distributed, and is therefore not intended for transmission of data between clients and servers.
A variety of Java communication services, including JDBC, CORBA, and RMI can be used by InfoBus components for access to distributed data. For example, the ESuite Data Access component is a Bean that connects any JDBC compliant data source to the InfoBus. Once the data is on the bus, it can easily be imported by any InfoBus Data Consumer, such as a spreadsheet, chartingcomponent, word processor or data analysis tool.
Will The General Public Have Access To The Infobus Apis?
Yes, under the usual terms of the JDK license. The specification and technology preview are available in our products archive.
How Does The Infobus Relate To Javabeans?
The InfoBus specification extends JavaBeans by providing a set of enhanced interfaces to share and exchange dynamic data.
What Is Glasgow?
Glasgow - the code name for add-ins to the JavaBeans specification. It contains following specifications
- The Extensible Runtime Containment and Services Protocol.
- The Drag and Drop Subsystem for the Java Foundation Classes.
- The JavaBeans Activation Framework.
To create the title property as a bound property for the MyBean component in the NetBeans GUI Builder, perform the following sequence of operations
Right-click the Bean Patterns node in the MyBean class hierarchy.
Select Add|Property from the pop-up menu.
Fill the New Property Pattern form and click OK.
What Is The Serializable Class In Java Beans?
Any class is serializable as long as that class or a parent class implements the java.io.Serializable interface. Examples of serializable classes include Component, String, Date, Vector, and Hashtable.
How To Control Serialization In Java Beans?
Three ways to control serilization in java beans
1.Automatic serialization, implemented by the Serializable interface. The Java serialization software serializes the entire object, except transient and static fields.
2.Customized serialization. Selectively exclude fields you do not want serialized by marking with the transient (or static) modifier.
3.Customized file format, implemented by the Externalizable interface and its two methods. Beans are written in a specific file format.
What Is Introspection Properties In Java Beans?
Introspection is the automatic process of analyzing a bean's design patterns to reveal the bean's properties, events, and methods.
What Are Introspection Api In Java Beans?
The JavaBeans API architecture supplies a set of classes and interfaces to provide introspection. The BeanInfo (in the API reference documentation) interface of the java.beans package defines a set of methods that allow bean implementors to provide explicit information about their beans. By specifying BeanInfo for a bean component, a developer can hide methods, specify an icon for the toolbox, provide descriptive names for properties, define which properties are bound properties, and much more.
The getBeanInfo(beanName) (in the API reference documentation) of the Introspector (in the API reference documentation) class can be used by builder tools and other automated environments to provide detailed information about a bean. The getBeanInfo method relies on the naming conventions for the bean's properties, events, and methods. A call to getBeanInfo results in the introspection process analyzing the bean?s classes and superclasses.
What Is Bean Customization?
Customization provides a means for modifying the appearance and behavior of a bean within an application builder so it meets your specific needs. There are several levels of customization available for a bean developer to allow other developers to get maximum benefit from a bean?s potential functionality.
1.By using a property editor. Each bean property has its own property editor. The NetBeans GUI Builder usually displays a bean's property editors in the Properties window. The property editor that is associated with a particular property type edits that property type.
2. By using customizers. Customizers give you complete GUI control over bean customization. Customizers are used where property editors are not practical or applicable. Unlike a property editor, which is associated with a property, a customizer is associated with a bean.
What Is Ejb Container?
A container that implements the EJB component contract of the J2EE architecture. This contract specifies a runtime environment for enterprise beans that includes security, concurrency, life-cycle management, transactions, deployment, naming, and other services. An EJB container is provided by an EJB or J2EE server.
What Is Ejb Context?
A vendor that supplies an EJB container. An object that allows an enterprise bean to invoke services provided by the container and to obtain the information about the caller of a client-invoked method.
What Is Ejb Home Object?
An object that provides the life-cycle operations (create, remove, find) for an enterprise bean. The class for the EJB Home object is generated by the container's deployment tools. The EJB Home object implements the enterprise bean's Home interface. The client references an EJB Home object to perform life-cycle operations on an EJB object. The client uses JNDI to locate an EJB Home object.
What Is Ejb Object?
An object whose class implements the enterprise bean's remote interface. A client never references an enterprise bean instance directly. A client always references an EJB object. The class of an EJB object is generated by a container's deployment tools.
What Is Entity Bean?
An enterprise bean that represents persistent data maintained in a database. An entity bean can manage its own persistence or can delegate this function to its container. An entity bean is identified by a primary key. If the container in which an entity bean is hosted crashes, the entity bean, its primary key, and any remote references survive the crash.
What Is Ejb Server?
Software that provides services to an EJB container. For example, an EJB container typically relies on a transaction manager that is part of the EJBserver to perform the two-phase commit across all the participating resource managers. The J2EE architecture assumes that an EJB container is hosted by an EJBserver from the same vendor, so it does not specify the contract between these two entities. An EJB server can host one or more EJB containers.
What Is Enterprise Information System?
The applications that constitute an enterprise's existing system for handling companywide information. These applications provide an information infrastructure for an enterprise. An enterpriseinformation system offers a well-defined set of services to its clients. These services are exposed to clients as local or remote interfaces or both. Examples of enterprise information systems include enterprise resource planning systems, mainframe transaction processing systems, and legacy database systems.
What Is Enterprise Javabeans?
A component architecture for the development and deployment of object-oriented, distributed, enterprise-level applications. Applications written using the Enterprise JavaBeans architecture are scalable, transactional, and secure.
What Is Enterprise Javabeans Query Language?
Defines the queries for the finder and select methods of an entity bean having container-managed persistence. A subset of SQL92, EJB QL has extensions that allow navigation over the relationships defined in an entity bean's abstract schema.
What Is Enterprise Bean Provider?
An application developer who produces enterprise bean classes, remote and Interview questions - Home interfaces, and deployment descriptor files, and packages them in an EJB JAR file.
What Is An Entity?
A distinct, individual item that can be included in an XML document by referencing it. Such an entity reference can name an entity as small as a character (for example, <, which references the less-than symbol or left angle bracket, <). An entity reference can also reference an entire document, an external entity, or a collection of DTD definitions.
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