InitialContext (Java SE 15 & JDK 15) (original) (raw)

All Implemented Interfaces:

[Context](Context.html "interface in javax.naming")

Direct Known Subclasses:

[InitialDirContext](directory/InitialDirContext.html "class in javax.naming.directory")

public class InitialContext extends Object implements Context

This class is the starting context for performing naming operations.

All naming operations are relative to a context. The initial context implements the Context interface and provides the starting point for resolution of names.

When the initial context is constructed, its environment is initialized with properties defined in the environment parameter passed to the constructor, and in anyapplication resource files.

JNDI determines each property's value by merging the values from the following two sources, in order:

  1. The first occurrence of the property from the constructor's environment parameter and system properties.
  2. The application resource files (jndi.properties).

For each property found in both of these two sources, or in more than one application resource file, the property's value is determined as follows. If the property is one of the standard JNDI properties that specify a list of JNDI factories (see Context), all of the values are concatenated into a single colon-separated list. For other properties, only the first value found is used.

The initial context implementation is determined at runtime. The default policy uses the environment property "java.naming.factory.initial", which contains the class name of the initial context factory. An exception to this policy is made when resolving URL strings, as described below.

When a URL string (a String of the form_scheme_id:rest_of_name_) is passed as a name parameter to any method, a URL context factory for handling that scheme is located and used to resolve the URL. If no such factory is found, the initial context specified by"java.naming.factory.initial" is used. Similarly, when aCompositeName object whose first component is a URL string is passed as a name parameter to any method, a URL context factory is located and used to resolve the first name component. See NamingManager.getURLContext() for a description of how URL context factories are located.

This default policy of locating the initial context and URL context factories may be overridden by callingNamingManager.setInitialContextFactoryBuilder().

NoInitialContextException is thrown when an initial context cannot be instantiated. This exception can be thrown during any interaction with the InitialContext, not only when the InitialContext is constructed. For example, the implementation of the initial context might lazily retrieve the context only when actual methods are invoked on it. The application should not have any dependency on when the existence of an initial context is determined.

When the environment property "java.naming.factory.initial" is non-null, the InitialContext constructor will attempt to create the initial context specified therein. At that time, the initial context factory involved might throw an exception if a problem is encountered. However, it is provider implementation-dependent when it verifies and indicates to the users of the initial context any environment property- or connection- related problems. It can do so lazily--delaying until an operation is performed on the context, or eagerly, at the time the context is constructed.

An InitialContext instance is not synchronized against concurrent access by multiple threads. Multiple threads each manipulating a different InitialContext instance need not synchronize. Threads that need to access a single InitialContext instance concurrently should synchronize amongst themselves and provide the necessary locking.

Since:

1.3, JNDI 1.1

See Also:

Context, NamingManager.setInitialContextFactoryBuilder

Fields

Modifier and Type Field Description
protected Context defaultInitCtx Field holding the result of calling NamingManager.getInitialContext().
protected boolean gotDefault Field indicating whether the initial context has been obtained by calling NamingManager.getInitialContext().
protected Hashtable<Object,​Object> myProps The environment associated with this InitialContext.

Fields declared in interface javax.naming.Context

[APPLET](Context.html#APPLET), [AUTHORITATIVE](Context.html#AUTHORITATIVE), [BATCHSIZE](Context.html#BATCHSIZE), [DNS_URL](Context.html#DNS%5FURL), [INITIAL_CONTEXT_FACTORY](Context.html#INITIAL%5FCONTEXT%5FFACTORY), [LANGUAGE](Context.html#LANGUAGE), [OBJECT_FACTORIES](Context.html#OBJECT%5FFACTORIES), [PROVIDER_URL](Context.html#PROVIDER%5FURL), [REFERRAL](Context.html#REFERRAL), [SECURITY_AUTHENTICATION](Context.html#SECURITY%5FAUTHENTICATION), [SECURITY_CREDENTIALS](Context.html#SECURITY%5FCREDENTIALS), [SECURITY_PRINCIPAL](Context.html#SECURITY%5FPRINCIPAL), [SECURITY_PROTOCOL](Context.html#SECURITY%5FPROTOCOL), [STATE_FACTORIES](Context.html#STATE%5FFACTORIES), [URL_PKG_PREFIXES](Context.html#URL%5FPKG%5FPREFIXES)

Constructors

Modifier Constructor Description
InitialContext() Constructs an initial context.
protected InitialContext​(boolean lazy) Constructs an initial context with the option of not initializing it.
InitialContext​(Hashtable environment) Constructs an initial context using the supplied environment.
Modifier and Type Method Description
String composeName​(String name,String prefix) Composes the name of this context with a name relative to this context.
Name composeName​(Name name,Name prefix) Composes the name of this context with a name relative to this context.
static T doLookup​(String name) A static method to retrieve the named object.
static T doLookup​(Name name) A static method to retrieve the named object.
protected Context getDefaultInitCtx() Retrieves the initial context by callingNamingManager.getInitialContext() and cache it in defaultInitCtx.
protected Context getURLOrDefaultInitCtx​(String name) Retrieves a context for resolving the string name name.
protected Context getURLOrDefaultInitCtx​(Name name) Retrieves a context for resolving name.
protected void init​(Hashtable environment) Initializes the initial context using the supplied environment.

Methods declared in class java.lang.Object

[clone](../../../java.base/java/lang/Object.html#clone%28%29), [equals](../../../java.base/java/lang/Object.html#equals%28java.lang.Object%29), [finalize](../../../java.base/java/lang/Object.html#finalize%28%29), [getClass](../../../java.base/java/lang/Object.html#getClass%28%29), [hashCode](../../../java.base/java/lang/Object.html#hashCode%28%29), [notify](../../../java.base/java/lang/Object.html#notify%28%29), [notifyAll](../../../java.base/java/lang/Object.html#notifyAll%28%29), [toString](../../../java.base/java/lang/Object.html#toString%28%29), [wait](../../../java.base/java/lang/Object.html#wait%28%29), [wait](../../../java.base/java/lang/Object.html#wait%28long%29), [wait](../../../java.base/java/lang/Object.html#wait%28long,int%29)

Methods declared in interface javax.naming.Context

[addToEnvironment](Context.html#addToEnvironment%28java.lang.String,java.lang.Object%29), [bind](Context.html#bind%28java.lang.String,java.lang.Object%29), [bind](Context.html#bind%28javax.naming.Name,java.lang.Object%29), [close](Context.html#close%28%29), [createSubcontext](Context.html#createSubcontext%28java.lang.String%29), [createSubcontext](Context.html#createSubcontext%28javax.naming.Name%29), [destroySubcontext](Context.html#destroySubcontext%28java.lang.String%29), [destroySubcontext](Context.html#destroySubcontext%28javax.naming.Name%29), [getEnvironment](Context.html#getEnvironment%28%29), [getNameInNamespace](Context.html#getNameInNamespace%28%29), [getNameParser](Context.html#getNameParser%28java.lang.String%29), [getNameParser](Context.html#getNameParser%28javax.naming.Name%29), [list](Context.html#list%28java.lang.String%29), [list](Context.html#list%28javax.naming.Name%29), [listBindings](Context.html#listBindings%28java.lang.String%29), [listBindings](Context.html#listBindings%28javax.naming.Name%29), [lookup](Context.html#lookup%28java.lang.String%29), [lookup](Context.html#lookup%28javax.naming.Name%29), [lookupLink](Context.html#lookupLink%28java.lang.String%29), [lookupLink](Context.html#lookupLink%28javax.naming.Name%29), [rebind](Context.html#rebind%28java.lang.String,java.lang.Object%29), [rebind](Context.html#rebind%28javax.naming.Name,java.lang.Object%29), [removeFromEnvironment](Context.html#removeFromEnvironment%28java.lang.String%29), [rename](Context.html#rename%28java.lang.String,java.lang.String%29), [rename](Context.html#rename%28javax.naming.Name,javax.naming.Name%29), [unbind](Context.html#unbind%28java.lang.String%29), [unbind](Context.html#unbind%28javax.naming.Name%29)