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Suppressing Applet alerts when using mail API

Greenhorn

Posts: 10

posted 15 years ago

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Hi,
Im using the following code to send email from my application. Im using JSF (tomahawk), Spring and hibernate in my application. I'm using spring email API classes to send email. This code works perfectly fine in the sense its parsing template and sending emails to the configured email id.

I have defined this class as a managed bean and i have a commanButton is UI which is bound to this sendEmail() method

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.ParseErrorException;

import org.apache.velocity.runtime.resource.loader.StringResourceLoader;
import org.apache.velocity.runtime.resource.util.StringResourceRepository;
import org.springframework.mail.MailException;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;

import au.gov.nsw.railcorp.onlineticketing.external.model.request.ServiceFees;

public class EmailService {
	JavaMailSenderImpl sender;
	VelocityEngine engine;
	public EmailService(){
	
	sender = new JavaMailSenderImpl();
    	sender.setHost("<smtp ip>");
    	sender.setPort(25);
    	sender.setUsername("<user id>");
    	sender.setPassword("<password>");
    	
    	
    	engine = new VelocityEngine();
    	Properties p = new Properties();
    	p.setProperty("resource.loader", "string");
    	p.setProperty("string.resource.loader.class",
    		"org.apache.velocity.runtime.resource.loader.StringResourceLoader");
    	try {
			engine.init(p);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	public VelocityEngine getEngine() {
		return engine;
	}

public void setEngine(VelocityEngine engine) {
		this.engine = engine;
	}

public JavaMailSenderImpl getSender() {
		return sender;
	}

public void setSender(JavaMailSenderImpl sender) {
		this.sender = sender;
	}

public static void main(String args[]){
		EmailService emailService=new EmailService();
		emailService.sendEmail();
	}
	
	public boolean sendEmail(){
	
	try{
			
        	MimeMessage message = sender.createMimeMessage();
        	
        	MimeMessageHelper helper = new MimeMessageHelper(message);
        	helper.setTo("<to email id>");
        	helper.setFrom("<from email id>");
        	helper.setSubject("Teting velocity");
        	
                	
        	VelocityContext context = new VelocityContext();
        	StringWriter writer =  new StringWriter();
        	
        	Template template =new Template();

StringResourceRepository repository =StringResourceLoader.getRepository();
           	String tempText="<html><body>Hi, ${username}...<p> this is a some template!</p></body></html>";
           	
           	
        	repository.putStringResource("myTemplate",tempText );
        	
        	
        	context.put("username", "Marc");
        	
        	
        	template = engine.getTemplate("myTemplate");
    		template.merge(context, writer);
    		
    		System.out.println("VM Template:\n" + tempText);
    		System.out.println("Output:\n" + writer);
    		
    		
    		String body=writer.toString();
        	
    		helper.setText(body,true);
    		sender.send(message);
        	
   
           
        }
        catch (MessagingException ex) {
            // simply log it and go on...
            System.err.println(ex.getMessage());            
        }
        catch (MailException ex) {
            // simply log it and go on...
            System.err.println(ex.getMessage());            
        } catch (ParseErrorException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
	} catch (Exception e) {
		// TODO Auto-generated catch block

e.printStackTrace();
	}
	return true;

}
}

The problem i have is when i try to invoke the function sendEmail() from my UI it is throwing a series of applet alerts (some 10 of them) . The following are the alerts that i get

1. The applet is attempting to invoke the java/lang/System.getProperty() operation on java.home
2. The applet is attempting to perform a read operation on the file C:\Program Files\java\jre1.5.0_14\javamail.providers
3. The applet is attempting to perform a read operation on the file C:\Program Files\java\jre1.5.0_14\javamail.address.map etc....

For ever applet alert i had to click on 'allow' for it to proceed. But there is no problem in sending mail after that. One more interesting this is i DONT get this alert when i try to execute this java class directly instead of calling the method from another class or from UI.

Can someone please let me know the reason for this applet alert and the way to suppress it?
Its really urgent .. please help

Thank you..

Ulf Dittmer

Rancher

Posts: 43081

posted 15 years ago

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There are a number of things applets are not allowed to do for security reasons; accessing local files and reading some of the system properties are in that list of things. See HowCanAnAppletReadFilesOnTheLocalFileSystem for the two principal ways around that.

Rob Spoor

Sheriff

Posts: 22848

132

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posted 15 years ago

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Although I was going to move this to the Spring forum, the Applet forum is a better place. Moving.

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Swaminathan Natarajan

Greenhorn

Posts: 10

posted 15 years ago

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Hi,
I'm working on a web based application . I'm not sure what is the need for applet and why the mail API is executing applets to send mail.

One more question is why do i NOT get such alerts when i run this as a standalone class( i have a main() method)

I'm looking for a solution which will prevent execution of applet rather than changing permission to allow it to access the system files. I need to deploy the application in production environment where i doubt i would be able to change or grant permissions to make applet work.

Can someone please help me out here..

Thanks,
Swami.

Ulf Dittmer

Rancher

Posts: 43081

posted 15 years ago

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Oh, I see - this is not actually an applet. In that case, I think you had describe what you mean by "applet alert" - can you attach a screenshot?

Standalone applications are generally run without any security managers - so the code can do anything it wants to. But web apps frequently are run with security managers, which -although more permissive than those used for applets- may prevent access to files in the JDK and some other things.

Also, please act on the private message I sent you prior to your next post. Accounts with invalid display names will be closed quickly.

Swaminathan Natarajan

Greenhorn

Posts: 10

posted 15 years ago

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Hi,
Please find attached the screen shots containing the applet alerts i get, in order in which they appear.

Thank you..

Applet-alerts.gif

Ulf Dittmer

Rancher

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posted 15 years ago

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You forgot to attach the screenshots.

Swaminathan Natarajan

Greenhorn

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posted 15 years ago

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Hi,
Sorry for missing out the screen shots.. some problems

I have attached it now.Please have a look at it.

Thanks..

Ulf Dittmer

Rancher

Posts: 43081

posted 15 years ago

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That is really odd. Are you running the server on the same machine where you are getting these warnings?

Swaminathan Natarajan

Greenhorn

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posted 15 years ago

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Yes Ulf... im running the server on the same machine where you are getting these warnings...

Its basically trying access the JVM properties and system properties of the server machine .When i try running this application using a browser from a different machine also (any other machine than the server) the browser waits for me to click on allow applet in the server machine... which is certainly unacceptable in a web app scenario