getting the value of .properties file

[Jigar Naik]

I have created one mail application and used MVC atchitecture... and in that application i have created one httpHost.properties file

inside .properties file

  smtpHost=smtpout.hostname.com  

and how do i access the value of that .properties file in to following

java class:

   String smtpHost = ???  

[Jaikiran Pai]

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("/httpHost.properties");
 
Properties props = new Properties();
props.load(inputStream);
String smtpHost = props.getProperty("smtpHost");

Also you look at this thread.
[ January 01, 2007: Message edited by: Jaikiran Pai ]

[Jigar Naik]

i've tried this but its giving null pointer exception

Properties properties = new Properties();
URL url = ClassLoader.getSystemResource("smtpHost.properties");
properties.load(url.openStream());
String smtpHost = properties.getProperty("hostName");

[Jaikiran Pai]

Your code is using the System Classloader to locate the properties file. And that might be the reason why the properties file is not being located and resulting the NullPointerException. Did you try the code in my earlier post?

[Jaikiran Pai]

And also note that the path that you pass to the getResourceAsStream method is relative to your application. The code that i posted assumes that the file is at the root of your application.

[Jigar Naik]

its still giving null pointer exception...

at java.util.Properties.load <unknown Source>

[Jigar Naik]

JBoss Console :

16:06:35,273 ERROR [STDERR] java.lang.NullPointerException
16:06:35,273 ERROR [STDERR] at java.util.Properties$LineReader.readLine(Unkn
own Source)
16:06:35,273 ERROR [STDERR] at java.util.Properties.load(Unknown Source)
16:06:35,273 ERROR [STDERR] at com.tg.mail.mail.send_mail(mail.java:62)
16:06:35,273 ERROR [STDERR] at com.tg.mail.sendMail.doPost(sendMail.java:63)

[Jaikiran Pai]

Is the inputstream null? Just before calling the load method, print the inputStream variable as follows:

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("/httpHost.properties");
 
Properties props = new Properties();
 
[B]System.out.println("InputStream is: " + inputStream);[/B]
props.load(inputStream);
String smtpHost = props.getProperty("smtpHost");

What does it print?

[Jigar Naik]

input stream is null

[Jigar Naik]

my smtpHost.properties file is in
SendMail (the name of project dir) ----> config ----> smtpHost.properties

and the structure of my SendMail.war file is

SendMail.war---> config---> smtpHost.properties

[Jaikiran Pai]

Originally posted by Jigar Naik:
my smtpHost.properties file is in
SendMail (the name of project dir) ----> config ----> smtpHost.properties

and the structure of my SendMail.war file is

SendMail.war---> config---> smtpHost.properties

As mentioned in one of my earlier posts, i had assumed that the properties file was at the root of the application. Now since the properties files is inside a folder named config, you will have to change the code to:

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("/config/smtpHost.properties");

The rest of the code remains the same.

[Jigar Naik]

ya i have tried the same... but its still giving null...

now i m putting the properties file at my desktop and giving it a full path... to c drive...

[Jigar Naik]

uhhhh

look at this code... its still null !!!

   InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("C:/Documents and Settings/jnaik.TRAVELGURU/Desktop/smtpHost.properties");
Properties props1 = new Properties();
System.out.println("InputStream is: " + inputStream);
props1.load(inputStream);
String smtpHost = props1.getProperty("smtpHost"); 

[Jaikiran Pai]

Originally posted by Jigar Naik:
uhhhh

look at this code... its still null !!!

   InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("C:/Documents and Settings/jnaik.TRAVELGURU/Desktop/smtpHost.properties");

That wont work. The getResourceAsStream looks for the resource in the classpath.

[Jaikiran Pai]

From where are you loading the properties file? I mean, is it a servlet? Also is that class part of the same SendMail.war application or is it part of some other application?

[Jigar Naik]

is it same as getRealPath ???

[Jigar Naik]

from my java class... i have created one function send_mail in that i m writing all the code...

and .properties file is in my prooject only...

[Jaikiran Pai]

I just tried it out in one of my sample applications. There was a mistake in the code that i posted. Here's the code that works:

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("config/smtpHost.properties");
 
Properties props = new Properties();
 
System.out.println("InputStream is: " + inputStream);
props.load(inputStream);
String smtpHost = props.getProperty("smtpHost");

Note that the parameter to getResourceAsStream is config/smtpHost.properties. Earlier i had specified a / at the start of the path.

Try it out.

[Jigar Naik]

ya thats what i'm trying...

[Jigar Naik]

i got

Input Stream : java.io.FileInputStream@db440a

[Jaikiran Pai]

Now that you are getting the inputstream, you will be able to read the value of the property as well.

[Jigar Naik]

ya we did it...

thanks a lot...

[Jaikiran Pai]