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    <pre><code>System.out.println("Logged User (ID): " + login.get_final_logged_ID()); </code></pre> <p>A <code>NullPointerException</code> on that line has as the only possible cause that <code>login</code> is <code>null</code>. Given the fact that the <code>@ManagedProperty</code> looks fine, this can have only one possible cause: the setter method <code>setLogin()</code> is broken. Make sure that it look exactly like this:</p> <pre><code>public void setLogin(Login login) { this.login = login; } </code></pre> <p>and thus <strong>not</strong> </p> <pre><code>public void setLogin(Login login) { login = login; } </code></pre> <p>or something else.</p> <hr> <p><strong>Update</strong> as per the comments:</p> <blockquote> <p><em>As for the faces-config.xml , here's the thing , the Login and bussiness services beans,for their repective jsf pages , are defined as "backingBean" in the <code>&lt;managed-bean-scope&gt;</code>. In the java beans ,as u saw , I defined them sessionScoped.</em></p> </blockquote> <p>Finally, there is the cause of your problem. Configuration in <code>faces-config.xml</code> <strong>overrides</strong> all JSF2 annotations on the bean in question. You have apparently not configured the <code>&lt;managed-property&gt;</code> in the <code>faces-config.xml</code>. You have 2 options:</p> <ol> <li><p>Remove the whole <code>&lt;managed-bean&gt;</code> configuration in <code>faces-config.xml</code>. The whole point of new JSF 2.x annotations like <code>@ManagedBean</code>, <code>@ManagedProperty</code>, etc is to <em>get rid</em> of verbose JSF 1.x style XML configuration.</p></li> <li><p>Add a <code>&lt;managed-property&gt;</code> value of <code>#{Login}</code> to the <code>&lt;managed-bean&gt;</code> of <code>Buss_Services</code>.</p> <pre><code>&lt;managed-property&gt; &lt;property-name&gt;login&lt;/property-name&gt; &lt;value&gt;#{Login}&lt;/value&gt; &lt;/managed-property&gt; </code></pre></li> </ol> <hr> <p><strong>Unrelated</strong> to the concrete problem. You've several serious flaws in the design and code style.</p> <ul> <li><p>You should <strong>not</strong> reference <code>UIComponent</code>s as properties. Instead, you should reference its values. Keep the model as simple as possible and never use <code>UIComponent</code> unless you have a really valid reason. E.g.</p> <pre><code>private String username; private String password; private Long userID; </code></pre></li> <li><p>Your login validation method is inefficient. It seems to haul the entire users table from DB into Java's memory wherein you test every individual row. You should try to write and finetune the SQL query as much as possible so that it returns <strong>exactly</strong> the information you're looking for. </p> <pre><code>statement = connection.prepareStatement("SELECT id FROM Users WHERE username = ? AND password = MD5(?)"); statement.setString(1, username); statement.setString(2, password); resultSet = statement.executeQuery(); if (resultSet.next()) { userID = resultSet.getLong("id"); } </code></pre></li> <li><p>Your PHP-like code style fully contradicts the <a href="http://www.oracle.com/technetwork/java/codeconventions-135099.html#367" rel="nofollow">Java Naming Conventions</a>. It makes the code harder to read and maintain by all other Java developers, such as the ones from who you expect answers when you post the code on the Internet, like here. Package names should be all lowercase. Underscores are only valid in constants, for all other names CamelCase should be used. Instance names (like managed bean names) should start with lowercase. Etcetera.</p></li> </ul>
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    1. COI double checked the setter and getter methods of the Login bean object for any probelm ,they seem fine , but I'm till getting the same erorr !!! . And great Thanks for the other great tips sir..
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    2. COTo be sure, this is the complete stacktrace? The **real** root cause is the bottommost part.
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    3. COI've updated the post , complete stacktrace log is there. Hope u check it out.
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