J2EE Interviews Question page15

1. What is query string ?
   A component of an HTTP request URL that contains a set of parameters and values that affect the handling of the request
      
2. What is queue ?
   A messaging system built on the concept of message queues. Each message is addressed to a specific queue; clients extract messages from the queues established to hold their messages.
      
3. What is RAR ?
   Resource Adapter Archive. A JAR archive that contains a resource adapter module.
      
4. What is RDF ?
   Resource Description Framework. A standard for defining the kind of data that an XML file contains. Such information can help ensure semantic integrity-for example-by helping to make sure that a date is treated as a date rather than simply as text.
    
5. What is RDF schema ?
   A standard for specifying consistency rules that apply to the specifications contained in an RDF.
     
6. What is realm ?
   See security policy domain. Also, a string, passed as part of an HTTP request during basic authentication, that defines a protection space. The protected resources on a server can be partitioned into a set of protection spaces, each with its own authentication scheme or authorization database or both. In the J2EE server authentication service, a realm is a complete database of roles, users, and groups that identify valid users of a Web application or a set of Web applications.
       
7. What is reentrant entity bean ?
   An entity bean that can handle multiple simultaneous, interleaved, or nested invocations that will not interfere with each other.
      
8. What is reference ?
   A reference to an entity that is substituted for the reference when the XML document is parsed. It can reference a predefined entity such as < or reference one that is defined in the DTD. In the XML data, the reference could be to an entity that is defined in the local subset of the DTD or to an external XML file (an external entity). The DTD can also carve out a segment of DTD specifications and give it a name so that it can be reused (included) at multiple points in the DTD by defining a parameter entity.
     
9. What is registry ?
   An infrastructure that enables the building, deployment, and discovery of Web services. It is a neutral third party that facilitates dynamic and loosely coupled business-to-business (B2B) interactions.
   
10. What is registry provider ?
    An implementation of a business registry that conforms to a specification for XML registries (for example, ebXML or UDDI).
       
11. What is relationship field ?
    A virtual field of an entity bean having container-managed persistence; it identifies a related entity bean.
      
12. What is remote interface ?
    One of two interfaces for an enterprise bean. The remote interface defines the business methods callable by a client.
      
13. What is remove method ?
    Method defined in the Home interface and invoked by a client to destroy an enterprise bean.
     
14. What is render kit ?
    A set of renderers that render output to a particular client. The JavaServer Faces implementation provides a standard HTML render kit, which is composed of renderers that can render HMTL markup.
      
15. What is renderer ?
    A Java class that can render the output for a set of JavaServer Faces UI components.
      
16. What is resource adapter ?
    A system-level software driver that is used by an EJB container or an application client to connect to an enterprise information system. A resource adapter typically is specific to an enterprise information system. It is available as a library and is used within the address space of the server or client using it. A resource adapter plugs in to a container. The application components deployed on the container then use the client API (exposed by the adapter) or tool-generated high-level abstractions to access the underlying enterprise information system. The resource adapter and EJB container collaborate to provide the underlying mechanisms-transactions, security, and connection pooling-for connectivity to the enterprise information system.
      
17. What is resource adapter module ?
    A deployable unit that contains all Java interfaces, classes, and native libraries, implementing a resource adapter along with the resource adapter deployment descriptor.
     
18. What is resource manager ?
    Provides access to a set of shared resources. A resource manager participates in transactions that are externally controlled and coordinated by a transaction manager. A resource manager typically is in a different address space or on a different machine from the clients that access it. Note: An enterprise information system is referred to as a resource manager when it is mentioned in the context of resource and transaction management.
       
19. What is resource manager connection ?
    An object that represents a session with a resource manager.