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AWS</a></li><li><a href="/java/appdynamics-and-tibco-businessworks-instrumentation-for-easy-integration.html" class="sidebar-link">AppDynamics and TIBCO BusinessWorks Instrumentation for Easy Integration</a></li><li><a href="/java/the-classpath.html" class="sidebar-link">The Classpath</a></li><li><a href="/java/resources-on-classpath.html" class="sidebar-link">Resources (on classpath)</a></li><li><a href="/java/contributors.html" class="sidebar-link">The Contributors</a></li></ul></section></li></ul> </aside> <main class="page"> <div class="theme-default-content content__default"><h1 id="jndi"><a href="#jndi" class="header-anchor">#</a> JNDI</h1> <h2 id="rmi-through-jndi"><a href="#rmi-through-jndi" class="header-anchor">#</a> RMI through JNDI</h2> <p>This example shows how JNDI works in RMI. It has two roles:</p> <ul><li>to provide the server with a bind/unbind/rebind API to the RMI Registry</li> <li>to provide the client with a lookup/list API to the RMI Registry.</li></ul> <p>The RMI Registry is part of RMI, not JNDI.</p> <p>To make this simple, we will use <code>java.rmi.registry.CreateRegistry()</code> to create the RMI Registry.</p> <li>
Server.java(the JNDI server)
<div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">com<span class="token punctuation">.</span>neohope<span class="token punctuation">.</span>jndi<span class="token punctuation">.</span>test</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">Context</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">InitialContext</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">NamingException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">IOException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>rmi<span class="token punctuation">.</span></span><span class="token class-name">RemoteException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>rmi<span class="token punctuation">.</span>registry<span class="token punctuation">.</span></span><span class="token class-name">LocateRegistry</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Hashtable</span><span class="token punctuation">;</span>
<span class="token comment">/**
* JNDI Server
* 1.create a registry on port 1234
* 2.bind JNDI
* 3.wait for connection
* 4.clean up and end
*/</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Server</span> <span class="token punctuation">{</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">Registry</span> registry<span class="token punctuation">;</span>
<span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token class-name">InitialContext</span> ctx<span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">initJNDI</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">try</span> <span class="token punctuation">{</span>
registry <span class="token operator">=</span> <span class="token class-name">LocateRegistry</span><span class="token punctuation">.</span><span class="token function">createRegistry</span><span class="token punctuation">(</span><span class="token number">1234</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">final</span> <span class="token class-name">Hashtable</span> jndiProperties <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Hashtable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>INITIAL_CONTEXT_FACTORY<span class="token punctuation">,</span> <span class="token string">"com.sun.jndi.rmi.registry.RegistryContextFactory"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>PROVIDER_URL<span class="token punctuation">,</span> <span class="token string">"rmi://localhost:1234"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ctx <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">InitialContext</span><span class="token punctuation">(</span>jndiProperties<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">NamingException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">RemoteException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">bindJNDI</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token class-name">Object</span> obj<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">NamingException</span> <span class="token punctuation">{</span>
ctx<span class="token punctuation">.</span><span class="token function">bind</span><span class="token punctuation">(</span>name<span class="token punctuation">,</span> obj<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">unbindJNDI</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">NamingException</span> <span class="token punctuation">{</span>
ctx<span class="token punctuation">.</span><span class="token function">unbind</span><span class="token punctuation">(</span>name<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">unInitJNDI</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">NamingException</span> <span class="token punctuation">{</span>
ctx<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">NamingException</span><span class="token punctuation">,</span> <span class="token class-name">IOException</span> <span class="token punctuation">{</span>
<span class="token function">initJNDI</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">NMessage</span> msg <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">NMessage</span><span class="token punctuation">(</span><span class="token string">"Just A Message"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">bindJNDI</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>in<span class="token punctuation">.</span><span class="token function">read</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">unbindJNDI</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">unInitJNDI</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></li> <li>
Client.java(the JNDI client)
<div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">com<span class="token punctuation">.</span>neohope<span class="token punctuation">.</span>jndi<span class="token punctuation">.</span>test</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">Context</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">InitialContext</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">javax<span class="token punctuation">.</span>naming<span class="token punctuation">.</span></span><span class="token class-name">NamingException</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Hashtable</span><span class="token punctuation">;</span>
<span class="token comment">/**
* 1.init context
* 2.lookup registry for the service
* 3.use the service
* 4.end
*/</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Client</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">NamingException</span> <span class="token punctuation">{</span>
<span class="token keyword">final</span> <span class="token class-name">Hashtable</span> jndiProperties <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Hashtable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>INITIAL_CONTEXT_FACTORY<span class="token punctuation">,</span> <span class="token string">"com.sun.jndi.rmi.registry.RegistryContextFactory"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>PROVIDER_URL<span class="token punctuation">,</span> <span class="token string">"rmi://localhost:1234"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">InitialContext</span> ctx <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">InitialContext</span><span class="token punctuation">(</span>jndiProperties<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">NMessage</span> msg <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">NeoMessage</span><span class="token punctuation">)</span> ctx<span class="token punctuation">.</span><span class="token function">lookup</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></li> <li>
NMessage.java (RMI server class)
<div class="language-java extra-class"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">com<span class="token punctuation">.</span>neohope<span class="token punctuation">.</span>jndi<span class="token punctuation">.</span>test</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>io<span class="token punctuation">.</span></span><span class="token class-name">Serializable</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token namespace">java<span class="token punctuation">.</span>rmi<span class="token punctuation">.</span></span><span class="token class-name">Remote</span><span class="token punctuation">;</span>
<span class="token comment">/**
* NMessage
* RMI server class
* must implements Remote and Serializable
*/</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">NMessage</span> <span class="token keyword">implements</span> <span class="token class-name">Remote</span><span class="token punctuation">,</span> <span class="token class-name">Serializable</span> <span class="token punctuation">{</span>
<span class="token keyword">public</span> <span class="token class-name">String</span> message <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span>
<span class="token keyword">public</span> <span class="token class-name">NMessage</span><span class="token punctuation">(</span><span class="token class-name">String</span> message<span class="token punctuation">)</span>
<span class="token punctuation">{</span>
<span class="token keyword">this</span><span class="token punctuation">.</span>message <span class="token operator">=</span> message<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre></div></li> <p>How to run the eaxmple:</p> <ol><li>build and start the server</li> <li>build and start the client</li></ol> <p><strong>Introduce</strong></p> <p><a href="http://i.stack.imgur.com/pGG8z.jpg" target="_blank" rel="noopener noreferrer"><img src="http://i.stack.imgur.com/pGG8z.jpg" alt="JNDI Model"><span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></p> <p>The <strong>Java Naming and Directory Interface (JNDI)</strong> is a Java API for a directory service that allows Java software clients to discover and look up data and objects via a name. It is designed to be independent of any specific naming or directory service implementation.</p> <p>The JNDI architecture consists of an <strong>API</strong> (Application Programming Interface) and an <strong>SPI</strong> (Service Provider Interface). Java applications use this API to access a variety of naming and directory services. The SPI enables a variety of naming and directory services to be plugged in transparently, allowing the Java application using the API of the JNDI technology to access their services.</p> <p>As you can see form the picture above, JNDI supports LDAP, DNS, NIS, NDS, RMI and CORBA. Of course, you can extend it.</p> <p><strong>How it works</strong></p> <p>In this example, the Java RMI use the JNDI API to look up objects in a network. If you want to look up a object, you need at least two pieces of information:</p> <ul><li>Where to find the object</li></ul> <p>The RMI Registry manages the name bindings, it tells you where to find the object.</p> <ul><li>The name of the object</li></ul> <p>What is a object's name? It is usually a string, it can also be a object that implements the Name interface.</p> <p><strong>Step by step</strong></p> <li>
First you need a registry, which manage the name binding. In this example, we use `java.rmi.registry.LocateRegistry`.
<div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">//This will start a registry on localhost, port 1234</span>
registry <span class="token operator">=</span> <span class="token class-name">LocateRegistry</span><span class="token punctuation">.</span><span class="token function">createRegistry</span><span class="token punctuation">(</span><span class="token number">1234</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></li> <li>
Both client and server need a Context. Server use the Context to bind the name and object. Client use the Context to lookup the name and get the object.
<div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">//We use com.sun.jndi.rmi.registry.RegistryContextFactory as the InitialContextFactory</span>
<span class="token keyword">final</span> <span class="token class-name">Hashtable</span> jndiProperties <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Hashtable</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>INITIAL_CONTEXT_FACTORY<span class="token punctuation">,</span> <span class="token string">"com.sun.jndi.rmi.registry.RegistryContextFactory"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">//the registry usrl is "rmi://localhost:1234"</span>
jndiProperties<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">Context</span><span class="token punctuation">.</span>PROVIDER_URL<span class="token punctuation">,</span> <span class="token string">"rmi://localhost:1234"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">InitialContext</span> ctx <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">InitialContext</span><span class="token punctuation">(</span>jndiProperties<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></li> <li>
The server bind the name and object
<div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">//The jndi name is "/neohope/jndi/test01"</span>
<span class="token function">bindJNDI</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></li> <li>
The client look up the object by the name "/neohope/jndi/test01"
<div class="language-java extra-class"><pre class="language-java"><code><span class="token comment">//look up the object by name "java:com/neohope/jndi/test01"</span>
<span class="token class-name">NeoMessage</span> msg <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token class-name">NeoMessage</span><span class="token punctuation">)</span> ctx<span class="token punctuation">.</span><span class="token function">lookup</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></li> <li>
Now the client can use the object
</li> <li>
When the server is ending, need to clean up.
<div class="language-java extra-class"><pre class="language-java"><code>ctx<span class="token punctuation">.</span><span class="token function">unbind</span><span class="token punctuation">(</span><span class="token string">"/neohope/jndi/test01"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
ctx<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre></div></li></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/devtut/generate/edit/master/docs/java/jndi.md" target="_blank" rel="noopener noreferrer">Edit this page on GitHub</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <!----></footer> <div class="page-nav"><p class="inner"><span class="prev">
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