Auto-generation of email with username and random password on creation of new user
<p>I have created a class NewUserEmail to auto generate an email with username and password while creating a new user. I am able to create the password but whenever I am trying to log in with that password, its not logging in. I am not able to generate my mail. Please guide me and let me know what is wrong with my code:</p>

<pre><code>import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.alfresco.error.AlfrescoRuntimeException;
import org.alfresco.model.ContentModel;
import org.alfresco.repo.jscript.ClasspathScriptLocation;
import org.alfresco.repo.node.NodeServicePolicies;
import org.alfresco.repo.policy.JavaBehaviour;
import org.alfresco.repo.policy.PolicyComponent;
import org.alfresco.repo.security.authentication.AuthenticationUtil;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.repository.ChildAssociationRef;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.security.PersonService;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;
import org.apache.log4j.Logger;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.mail.javamail.MimeMessagePreparator;

public class NewUserEmail implements NodeServicePolicies.OnCreateNodePolicy {

    private Logger logger = Logger.getLogger(NewUserEmail.class);
    private PolicyComponent policyComponent;
    private NodeService nodeService;
    private PersonService personService;
    private ServiceRegistry serviceRegistry;
    protected String userName = null;
    protected String password = null;
    protected String email = null;
    protected String subject = null;
    protected String body = null;

    private static final String NEW_USER_EMAIL_TEMPLATE = "alfresco/module/demoact1-repo/template/new_user_email.ftl";
    private static final String EMAIL_FROM = "no-reply@eisenvault.com";

    public void init() {
        this.email = "";
        this.userName = "";
        this.password = "";
        this.subject = "New User Alfresco";
        this.body = "";
        this.policyComponent.bindClassBehaviour(
                QName.createQName(NamespaceService.ALFRESCO_URI, "onCreateNode"),
                ContentModel.TYPE_PERSON,
                new JavaBehaviour(this, "ReportUser", org.alfresco.repo.policy.JavaBehaviour.NotificationFrequency.EVERY_EVENT)
        );
    }

    public void onCreateNode(ChildAssociationRef childAssocRef) {
        if (logger.isInfoEnabled()) logger.info(" NewUserEmail Node create policy fired");
    }

    public void setNodeService(NodeService nodeService) {
        this.nodeService = nodeService;
    }

    public void setPolicyComponent(PolicyComponent policyComponent) {
        this.policyComponent = policyComponent;
    }

    public void setServiceRegistry(ServiceRegistry serviceRegistry) {
        this.serviceRegistry = serviceRegistry;
    }

    public String getSubject() {
        return this.subject;
    }

    public String getBody() {
        return this.body;
    }

    public String getEmail() {
        return this.email;
    }

    public String getUserName() {
        return this.userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    public void ReportUser(ChildAssociationRef childAssocRef) {
        NodeRef personRef = childAssocRef.getChildRef();
        this.userName = (String) this.nodeService.getProperty(personRef, ContentModel.PROP_USERNAME);
        this.email = (String) this.nodeService.getProperty(personRef, ContentModel.PROP_EMAIL);
        sendEmail();
    }


    public void sendEmail() throws AlfrescoRuntimeException {
        Map&lt;String, Object&gt; templateModel = new HashMap&lt;String, Object&gt;();
        if (getEmail() != null &amp;&amp; getEmail() != "") {
            Set&lt;NodeRef&gt; result = serviceRegistry.getPersonService().getPeopleFilteredByProperty(ContentModel.PROP_EMAIL, getEmail(), 1);
            if (result.size() == 1) {
                changePassword(getUserName());
                ClasspathScriptLocation location = new ClasspathScriptLocation(NEW_USER_EMAIL_TEMPLATE);
                try {
                    if (location.getInputStream() != null) {
                        // Check that there is a template
                        templateModel.put("userName", getUserName());
                        templateModel.put("password", getPassword());
                        this.body = serviceRegistry.getTemplateService().processTemplate("freemarker", NEW_USER_EMAIL_TEMPLATE, templateModel);
                    }
                } catch (AlfrescoRuntimeException e) {
                    // If template isn't found, email is constructed "manually"
                    logger.error("Email Template not found " + NEW_USER_EMAIL_TEMPLATE);
                    this.body = "&lt;html&gt; &lt;body&gt; &lt;p&gt; A new User has been created.&lt;/p&gt;" +
                            "&lt;p&gt;Hello, &lt;/p&gt;&lt;p&gt;Your username is " + getUserName() + " and your " +
                            "password is " + getPassword() + "&lt;/p&gt; " +
                            "&lt;p&gt;We strongly advise you to change your password when you log in for the first time.&lt;/p&gt;" +
                            "Regards&lt;/body&gt; &lt;/html&gt;";
                    //send();
                }
            }
        }
    }

    protected void send() {
        MimeMessagePreparator mailPreparer = new MimeMessagePreparator() {
            public void prepare(MimeMessage mimeMessage) throws MessagingException {
                MimeMessageHelper message = new MimeMessageHelper(mimeMessage);
                message.setTo(getEmail());
                message.setSubject(getSubject());
                message.setText(getBody(), true);
                message.setFrom(EMAIL_FROM);
            }
        };
    }

    public void changePassword(String password) {
        AuthenticationUtil.setRunAsUserSystem();
        Set&lt;NodeRef&gt; result = serviceRegistry.getPersonService().getPeopleFilteredByProperty(ContentModel.PROP_EMAIL, getEmail(), 1);
        if (result.size() == 1) {
            Object[] userNodeRefs = result.toArray();
            NodeRef userNodeRef = (NodeRef) userNodeRefs[0];
            String username = (String) serviceRegistry.getNodeService().getProperty(userNodeRef, ContentModel.PROP_USERNAME);
            // Generate random password
            String newPassword = Password.generatePassword();
            char[] cadChars = new char[newPassword.length()];
            for (int i = 0; i &lt; newPassword.length(); i++) {
                cadChars[i] = newPassword.charAt(i);
            }
            serviceRegistry.getAuthenticationService().setAuthentication(username, newPassword.toCharArray());
            setPassword(newPassword);
            System.out.println("Password is :" + newPassword);
        }
    }

}
</code></pre>