Develop Reference

retrieve value from servlet and store in xml file [duplicate]

I am trying to generate a XML file and save it in /WEB-INF/pages/.
Below is my code which uses a relative path:
File folder = new File("src/main/webapp/WEB-INF/pages/");
StreamResult result = new StreamResult(new File(folder, fileName));
It's working fine when running as an application on my local machine (C:\Users\userName\Desktop\Source\MyProject\src\main\webapp\WEB-INF\pages\myFile.xml).
But when deploying and running on server machine, it throws the below exception:
javax.xml.transform.TransformerException:
java.io.FileNotFoundException
C:\project\eclipse-jee-luna-R-win32-x86_64\eclipse\src\main\webapp\WEB INF\pages\myFile.xml
I tried getServletContext().getRealPath() as well, but it's returning null on my server. Can someone help?

Never use relative local disk file system paths in a Java EE web application such as new File("filename.xml"). For an in depth explanation, see also getResourceAsStream() vs FileInputStream.
Never use getRealPath() with the purpose to obtain a location to write files. For an in depth explanation, see also What does servletcontext.getRealPath("/") mean and when should I use it.
Never write files to deploy folder anyway. For an in depth explanation, see also Recommended way to save uploaded files in a servlet application.
Always write them to an external folder on a predefined absolute path.
Either hardcoded:
File folder = new File("/absolute/path/to/web/files");
File result = new File(folder, "filename.xml");
// ...
Or configured in one of many ways:
File folder = new File(System.getProperty("xml.location"));
File result = new File(folder, "filename.xml");
// ...
Or making use of container-managed temp folder:
File folder = (File) getServletContext().getAttribute(ServletContext.TEMPDIR);
File result = new File(folder, "filename.xml");
// ...
Or making use of OS-managed temp folder:
File result = File.createTempFile("filename-", ".xml");
// ...
The alternative is to use a (embedded) database or a CDN host (e.g. S3).
See also:
Recommended way to save uploaded files in a servlet application
Where to place and how to read configuration resource files in servlet based application?
Simple ways to keep data on redeployment of Java EE 7 web application
Store PDF for a limited time on app server and make it available for download
What does servletcontext.getRealPath("/") mean and when should I use it
getResourceAsStream() vs FileInputStream

just use
File relpath = new File(".\pages\");
as application cursor in default stay into web-inf folder.

Why getClass().getProtectionDomain().getCodeSource().getLocation().getPath() doesn't work in final product after compiled?

Ok, Here is my Web project. I built it in eClipse with the following structure:
workspace3\MyProject\war\images\uploaded
workspace3\MyProject\war\WEB-INF\classes
Ok, I want to store the uploaded images into workspace3\MyProject\war\images\unloaded, so here is the code at service side & it works fine in Eclipse
String absolutePath = getClass().getProtectionDomain().getCodeSource().getLocation().getPath();
absolutePath=absolutePath.replace("WEB-INF/classes/", "images/uploaded");
File file = File.createTempFile("upload-", "."+extName, new File(absolutePath));
Ok, now I compiled my project & put it into VPS with Tomcat server and it has the following structure
tomcat7\webapps\ROOT\images\uploaded
tomcat7\webapps\ROOT\WEB-INF\classes
However, somehow when run the website via internet, it couldn't find the images\uploaded location.
Did i do anything wrong here?
Why getClass().getProtectionDomain().getCodeSource().getLocation().getPath() doesn't work in final product after compiled?

You should rather use ServletContext#getRealPath(...) to determine the file system path of your web application:
String absolutePath = request.getServletContext().getRealPath("/images/uploaded");
// File uploaded to this directory will be accessible via
// `http://<yourserver>/<web-app>/images/uploaded/`
But be careful! The servlet specification does not guarantee, that getRealPath will return a path to a writable directory. And it may return null in case the virtual path cannot be translated to a real path!
If you want to be sure, that the destination is a writable directory, and you just want to upload files into a temporary directory for processing, consider using the web application's private temp directory:
File tempDir = (File)request.getServletContext().getAttribute(ServletContext.TEMPDIR);
// Files uploaded to that directory will NOT be automatically published to WWW.
Note that this directory is temporary only and may not survive a server restart! So it is not thought for durable persistance.
The most sensible and durable solution is to write the file into a database, or any other repository (e.g. JCR like Jackrabbit), or into a file directory that is NOT controlled by your web server (and is specified from outside, e.g. via system property or in web.xml).

How do I get a resource using Class, ClassLoader, and URL

I am writing a simple JSF application and am trying to get a resource (database.properties file) using Class, ClassLoader, and URL that is not working. url is null and I don't know why. I have done a lot of research but without success.
Code:
Class cls = Class.forName("<packagename>.SimpleDataSource");
ClassLoader cLoader = cls.getClassLoader();
URL url = cLoader.getResource(fileName); // fileName = "database.properties" w/o the double quote
FileInputStream in = new FileInputStream(url.getFile());

Thanks for your comment Sandeep, it was helpful. I found out that my properties file was in the wrong place. I then moved it inside my src folder under the java resources folder and now my properties file gets loaded in. I have a new problem now but will start a new thread if I can't figure it out.

Once you have a URL you can get an InputStream from it using url.openStream(), or you can simply use cLoader.getResourceAsStream(...) in the first place. Your current approach of
FileInputStream in = new FileInputStream(url.getFile());
will work on some platforms but not all, and only when your application is running from a directory on disk. It will fail if your classes and resources are packed up into a JAR, but if you use getResourceAsStream it will work from a JAR as well as an unpacked directory.

Adding and accessing resource files to Play Framework application

I am running a PlayFramework 2 application. The application builds a client authenticated SSL session to a 2nd server. To accomplish this I am storing a Java Keystore file in a resource directory. Everything runs fine on my local box. Next I create a dist package for upload to Cloud Foundry which essentially builds a war file with a buch of Jars. Any idea how I can access the Keystore from my java code once its compiled into a Jar and uploaded to CloudFoundry? Any direction would be greatly appreciated. Here is current code snippet.
Best,
SR
//READS THE JAVA KEYSTORE FILE FROM A RELATIVE LOCATION
File clientKS = new File("resource/devportal.jks");
//SET CONNECTION PARAMS
con.setRequestMethod("POST");
con.setRequestProperty("Content-Type","application/json");
con.setDoOutput(true);
con.setSSLSocketFactory(getFactory(clientKS, passphrase.toCharArray()));

Assuming there is no other way than to use a java.io.File, you may want to try getting ahold of it by putting it in the classpath of your app and do something like
AnyClassOfYourApp.class.getResource("devportal.jks").getFile()

Its been a while but try this:
//TESTING BY USING INCLUDED KEYSTORE IN JAR FILE
String ksPath = "/res/devportal.jks";
URL jksURL = PostNvp.class.getResource(ksPath);
File jksStore = new File(jksURL.toURI());
//TESTING
Where PostNvp is my java class PostNvp.java where this code snippet lives.

Classpath Resource in Tomcat6 (Works in Jetty)

I'm having trouble with a legacy Web Application that I'm migrating to Maven3.
I need to obtain a file from the Classpath that in the directory structure is located in:
/src/main/resources/com/thinkglish/geoip/GeoIP.dat
When I create the .war file with the Maven build, I can confirm that this .dat file is located (as it should be) in:
WEB-INF/classes/com/thinkglish/geoip/GeoIP.dat
I'm trying two different approaches to get the resource from one of my classes, which implements javax.servlet.Filter:
ClassPathResource resource = new ClassPathResource("com/thinkglish/geoip/GeoIp.dat");
and
URL resource = getClass().getResource("/com/thinkglish/geoip/GeoIp.dat");
If I start the application using Maven's Jetty plugin, that works fine in both ways. However, when I deploy the application in a Tomcat and start the server, the resource cannot be located.
In the first case I get a java.io.FileNotFoundException: class path resource [com/thinkglish/geoip/GeoIp.dat] cannot be resolved to URL because it does not exist and in the second case the resource is null.
A curious thing about all this is that if I use one method or the other trying to obtain another resource from the Classpath (e.g. com/thinkglish/struts/i18n/MessageResources.properties or com/thinkglish/filter/LanguageFilter.class) it works without any problems.
Do you have any guess about this? Is it possible that the .dat extension has anything to do with this?
Edited - More data!
I added a new .properties mock file to the exact same directory in which the .dat file lives:
/src/main/resources/com/thinkglish/geoip/mock.properties
I tried to obtain it in Tomcat6 and it worked!
ClassPathResource resource = new ClassPathResource("com/thinkglish/geoip/mock.properties");
I'm starting to think that I need to do something else configuration-wise to make Tomcat6 accept the .dat file as a Classpath resource.
Thanks in advance!

I might be barking up completely the wrong tree here... but have you checked the capitalisation of GeoIP.dat / GeoIp.dat? Is Tomcat running on a case-sensitive OS?

Following should work:
String classpathLocation = "com/thinkglish/geoip/GeoIp.dat";
URL classpathResource = Thread.currentThread().getContextClassLoader().getResource(classpathLocation);
// Or:
InputStream input = Thread.currentThread().getContextClassLoader().getResourceAsStream(classpathLocation);