The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
The Context interface contains methods for adding, replacing, and removing a binding in a context.
Context.bind() is used to add a binding to a context. It accepts as arguments the name of the object and the object to be bound.
Before you go on: The examples in this lesson require that you make additions to the schema. You must either turn off schema-checking in the LDAP server or add
the schema
that accompanies this tutorial to the server. Both of these tasks are typically performed by the directory server's administrator. See the
LDAP Setuplesson.
// Create the object to be bound Fruit fruit = new Fruit("orange"); // Perform the bind ctx.bind("cn=Favorite Fruit", fruit);
This example
creates an object of class
Fruit
and binds it to the name "cn=Favorite Fruit" in the context ctx. If you subsequently looked up the name "cn=Favorite Fruit" in ctx, then you would get the fruit object. Note that to compile the Fruit class, you need the
FruitFactory
class.
If you were to run this example twice, then the second attempt would fail with a NameAlreadyBoundException. This is because the name "cn=Favorite Fruit" is already bound. For the second attempt to succeed, you would have to use rebind().
rebind() is used to add or replace a binding. It accepts the same arguments as bind(), but the semantics are such that if the name is already bound, then it will be unbound and the newly given object will be bound.
// Create the object to be bound Fruit fruit = new Fruit("lemon"); // Perform the bind ctx.rebind("cn=Favorite Fruit", fruit);
When you run
this example
, it will replace the binding created by the
bind()
example.
To remove a binding, you use unbind().
// Remove the binding ctx.unbind("cn=Favorite Fruit");
This example
, when run, removes the binding that was created by the
bind()
or
rebind()
example.