classloader.getSystemResourceAsStream returns null

Question

I'm trying to load a properties file without using the actual path of the file. I've already done that on some other simple apps using:

InputStream inputStream = ClassLoader.getSystemResourceAsStream(PROPERTIES_FILE);
props.load(inputStream);

But this time it doesn't work. The inputStream is null for some reason. PROPERTIES_FILE is a constant defined as "app.properties". I tried to remove the .properties extension and got the same results.

Any ideas?

Thanks.

Where is app.properties located? – Michael Myers Apr 20 '09 at 21:13 — Michael Myers, Apr 20 '09 at 21:13

jconlin · Accepted Answer · 2009-04-20T21:26:40.187

13

The PROPERTIES_FILE constant should include the package as well as the properties file (e.g. "com/some/library/file.properties".

    final static String PROPS_FILE = "/com/some/library/file.props";
                     //The preceding  "/" is dependendant on wheterh 
                     //you are going to be giving a relative or absolute location
    InputStream is = YourCurrentClass.class.getResourceAsStream(PROPS_FILE);

edited Apr 20 '09 at 21:26

answered Apr 20 '09 at 21:15

jconlin

3,806
6
31
32

I've added the package information as you mentioned but still got the same error. BTW the method where I'm doing that call is static if that helps any... – Lancelot Apr 20 '09 at 21:20
Actually there was a typo when I added the package name. That solution worked great. Thanks! :) – Lancelot Apr 20 '09 at 21:23
1

You probably want to call getResourceAsStream on your class' class loader. Or probably on your class' Class. – Tom Hawtin - tackline Apr 20 '09 at 21:26
I believe the actual problem was he was using "ClassLoader.getSystemResourceAsStream" which looks for system resources. There is a slight difference. This is a good discussion: http://www.coderanch.com/t/369908//java/ClassLoader-getSystemResourceAsStream – markthegrea May 04 '10 at 14:52
I have the very same problem. I have a spring web application and I want to load an xml file for testing purposes. It is located at WebContent/WebContent/WEB-INF/classes/testing/document.xml I've tried InputStream is = getClass().getClassLoader().getResourceAsStream("WebContent/WEB-INF/classes/testing/document.xml"); but it ends with a null. I tried to omit the initial "/" but it's the same. What am I missing? – MaVVamaldo Mar 02 '12 at 14:57

score 0 · Answer 2 · edited Dec 23 '19 at 17:58

0

Got the same problem.

Reason: I renamed DAO package to dao. While exploding the artifact, directory DAO not get overwritten.

So I got dao in project internals and DAO in filesystem :facepalm:

edited Dec 23 '19 at 17:58

T. Short

3,481
14
30

answered Dec 23 '19 at 16:54

Gogogo

1
1

score -1 · Answer 3 · answered Apr 20 '09 at 21:15

-1

When getSystemResourceAsStream returns null, it means the resource was not found. Make sure the requested resource really is on the classpath at the specified location.

answered Apr 20 '09 at 21:15

erickson

265,237
58
395
493

It answers the question really precisly, but does not support helping to solve the problem. – Barny Jun 21 '22 at 12:13

classloader.getSystemResourceAsStream returns null

3 Answers3