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See race hazard.
- Browse Related Terms: continuous simulation, critical section, discrete simulation, memory leak, race condition, synchronized statement, white space, XSL-FO
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A situation that arises between multiple threads sharing a resource. A race hazard arises when one thread's assumptions about the state of a resource are invalidated by the actions of another thread.
- Browse Related Terms: Concurrency, curly brackets, daemon thread, garbage collector, interrupt, lightweight process, livelock, multithreaded, parallel programming, polling, preempt, priority level, process, quantum, race hazard, round robin allocation, synchronized, thread starvation, timeslice
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A group of selectable components in which only one component may be selected. Selection of one of the group causes the previously selected component to be deselected.
- Browse Related Terms: bean, HSB Color Model, JavaBeans, layout manager, life cycle (JavaServer Faces), module, Pipe, radio buttons, RGB Color Model, service element, shortcut key
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Random access memory, or RAM, is memory whose contents are easily accessible to the processing components of a computer. In particular, the time it takes to read and write to a particular part of the memory does not depend on the address of the location to be read or written. This is in contrast to something like video tape which is accessed serially and, hence, the time it takes to read or write to any part of it depends on how far away the location is.
- Browse Related Terms: address space, archiving, compositing, deployment, distributed, double buffering, host system, interprocess communication, micro-chip, normalization, North American Industry Classification System (NAICS), object serialization, preverification, Random Access Memory, timesharing system, virtual memory
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- Resource Adapter Archive. A JAR archive that contains a resource adapter module.
- Browse Related Terms: deployer, EAR file, EJB JAR file, enterprise bean provider, MIDlet, MIDlet suite, PRC (Palm Resource Code), programmatic security, RAR, WAR file
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A two-dimensional rectangular grid of pixels.
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- 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.
- Browse Related Terms: absolute filename, asant, binding (XML), build file, Document Object Model, DOM, Extensible Markup Language, Java API for XML Processing (JAXP), kXML, processing instruction, RDF, relative filename, XLL, XML Schema
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- A standard for specifying consistency rules that apply to the specifications contained in an RDF.
- Browse Related Terms: HTML, ISO 3166, key value, MIME, Parsing, RDF schema, SGML, SQL, Universal Standard Products and Services Classification (UNSPSC), XSL
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A sub class of the
Readerabstract, defined in thejava.iopackage. Reader classes translate input from a host-dependent character set encoding into Unicode. See Writer class.- Browse Related Terms: filter stream, hash code, Reader class, stream class, Writer class
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A number with an integer and a fractional part. The primitive types
doubleandfloatare used to represent real numbers.- Browse Related Terms: autoboxing, boolean, byte, CAST, casting, data type, double precision, enumerated type, integer, literal, primitive type, real number, redundant value, sign extension, single precision, wrapper classes
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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 and/or authorization database.
- 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.
- Browse Related Terms: access control, authorization, authorization constraint, group, Realm, role (security), security constraint, security policy domain, security role, security technology domain, security view
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Recursion results from a method being invoked when an existing call to the same method has not yet returned. For instance
public static void countDown(int n){ if(n >= 0){ System.out.println(n); countDown(n-1); } // else - base case. End of recursion. }See direct recursion, indirect recursion and mutual recursion for the different forms this can take.- Browse Related Terms: base case, class method, direct recursion, indirect recursion, instance method, message passing, mutual recursion, recursion
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The value of a data type that has no use or meaning within a particular context. For instance, negative values would be redundant a class using integer attributes to model assignment marks. In some applications, redundant patterns serve a useful purpose in that they can be used explicitly as out-of-bounds values or escape values.
- Browse Related Terms: autoboxing, boolean, byte, CAST, casting, data type, double precision, enumerated type, integer, literal, primitive type, real number, redundant value, sign extension, single precision, wrapper classes
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- An entity bean that can handle multiple simultaneous, interleaved, or nested invocations that will not interfere with each other.
- Browse Related Terms: abstract schema, bean-managed persistence, cascade delete, container-managed persistence, conversational state, enterprise bean, Enterprise JavaBeans Query Language (EJB QL), entity bean, home interface, persistence, persistent field, primary key, reentrant entity bean, relationship field, stateful session bean, stateless session bean
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- See entity reference.
A variable data type in which the variable's value is an address.
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The ability to find out what methods, fields, constructors, and so on, are defined for a class or object. Reflection is supported by the
Classclass, and other classes in thejava.lang.reflectpackage. Reflection makes it possible, among other things, to create dynamic programs.
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- 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.
- Browse Related Terms: Agent, Client, Common Gateway Interface, distributed application, Java 2 Platform, Enterprise Edition (J2EE), Javascript, JavaServer Faces Technology, POA, registry, servlet, Web server provider, Web service
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- An implementation of a business registry that conforms to a specification for XML registries (for example, ebXML or UDDI).
- Browse Related Terms: B2B, ebXML, Java API for XML Registries (JAXR), OASIS, registry provider, UDDI (Universal Description Discovery and Integration), XML registry
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Operators, such as
<,>,<=,>=,==and!=, that produce a boolean result, as part of a boolean expression.- Browse Related Terms: arithmetic expression, arithmetic operator, assignment operator, binary operator, boolean expression, conditional operator, De Morgan's Theorem, expression, fully evaluating operator, implicit type conversion, JSP expression, logical operators, operand, operator, precedence rules, quotient, relational operators, short-circuit operator
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- A virtual field of an entity bean having container-managed persistence; it identifies a related entity bean.
- Browse Related Terms: abstract schema, bean-managed persistence, cascade delete, container-managed persistence, conversational state, enterprise bean, Enterprise JavaBeans Query Language (EJB QL), entity bean, home interface, persistence, persistent field, primary key, reentrant entity bean, relationship field, stateful session bean, stateless session bean