[java] getResourceAsStream() is always returning null



Answers

A call to Class#getResourceAsStream(String) delegates to the class loader and the resource is searched in the class path. In other words, you current code won't work and you should put abc.txt in WEB-INF/classes, or in WEB-INF/lib if packaged in a jar file.

Or use ServletContext.getResourceAsStream(String) which allows servlet containers to make a resource available to a servlet from any location, without using a class loader. So use this from a Servlet:

this.getServletContext().getResourceAsStream("/WEB-INF/abc.txt") ;

But is there a way I can call getServletContext from my Web Service?

If you are using JAX-WS, then you can get a WebServiceContext injected:

@Resource
private WebServiceContext wsContext;

And then get the ServletContext from it:

ServletContext sContext= wsContext.getMessageContext()
                             .get(MessageContext.SERVLET_CONTEXT));
Question

I have the following structure in a Java Web Application:

TheProject
  -- [Web Pages]
  -- -- [WEB-INF]
  -- -- -- abc.txt
  -- -- index.jsp
  -- [Source Packages]
  -- -- [wservices]
  -- -- -- WS.java

In WS.java, I am using the following code in a Web Method:

InputStream fstream = this.getClass().getResourceAsStream("abc.txt");

But it is always returning a null. I need to read from that file, and I read that if you put the files in WEB-INF, you can access them with getResourceAsStream, yet the method is always returning a null.

Any ideas of what I may be doing wrong?

Btw, the strange thing is that this was working, but after I performed a Clean and Build on the Project, it suddenly stopped working :/




I think this way you can get the file from "anywhere" (including server locations) and you do not need to care about where to put it.

It's usually a bad practice having to care about such things.

Thread.currentThread().getContextClassLoader().getResourceAsStream("abc.properties");



I had the same problem when I changed from Websphere 8.5 to WebSphere Liberty.

I utilized FileInputStream instead of getResourceAsStream(), because for some reason WebSphere Liberty can't locate the file in the WEB-INF folder.

The script was :

FileInputStream fis = new FileInputStream(getServletContext().getRealPath("/") 
                        + "\WEBINF\properties\myProperties.properties")

Note: I used this script only for development.




Related