ClassLoader.getSystemResource Help

Thread view:

h4hrr - 02 Feb 2006 13:39 GMT

Hi
i am trying to load a property file for logging.. but i am always
getting a

java.lang.ExceptionInInitializerError
Caused by: java.lang.NullPointerException

in the main class, i have:
private static Logger logger = LoggerFactory.create(JDBC.class);

and in LoggerFactory create class for initilization

try {
URL configFileURL =
ClassLoader.getSystemResource(configFile);
logManager.readConfiguration(configFileURL.openStream());
} catch (MalformedURLException e1) {
e1.printStackTrace();

but its not reading the system resourse and URL is always null, the
same code is working for other projects.. what could be the missing
point..

any help is appreciated

Reply to this Message

Thomas Hawtin - 02 Feb 2006 20:50 GMT

> URL configFileURL =
> ClassLoader.getSystemResource(configFile);

> but its not reading the system resourse and URL is always null, the
> same code is working for other projects.. what could be the missing
> point..

Presumably the resource is not present on the classpath.

Tom Hawtin

Signature

Unemployed English Java programmer
http://jroller.com/page/tackline/

Reply to this Message

Ian Pilcher - 02 Feb 2006 21:18 GMT

>> URL configFileURL =
>> ClassLoader.getSystemResource(configFile);
[quoted text clipped - 4 lines]
>
> Presumably the resource is not present on the classpath.

Or it is, but the OP is specifying it incorrectly. The documentation
doesn't give much help in this area, but I've found that using a fully
qualified name, *without* a starting slash, works.

For example, if the file I'm after is located at
$CLASSPATH/foo/bar/baz.xml, I'll refer to it as "foo/bar/baz.xml".

HTH

Signature

========================================================================
Ian Pilcher i.pilcher@comcast.net
========================================================================

Reply to this Message

h4hrr - 02 Feb 2006 23:05 GMT

the file is in the root directory of the project.. and i define it like

private static String configFile = "log.paramters"

still trying to find the cause :-||

Reply to this Message

Ian Pilcher - 02 Feb 2006 23:48 GMT

> the file is in the root directory of the project.. and i define it like
>
> private static String configFile = "log.paramters"
>
> still trying to find the cause :-||

IIRC, getResource and friends may not work for objects in the root
directory. Try moving it to a subdirectory.

Signature

========================================================================
Ian Pilcher i.pilcher@comcast.net
========================================================================

Reply to this Message

Nirav - 03 Feb 2006 09:56 GMT

Try loading it with contextClassLoader, it will load resource from root
directory as well.

Nirav Thaker

Reply to this Message

Thomas Hawtin - 03 Feb 2006 18:23 GMT

> Try loading it with contextClassLoader, it will load resource from root
> directory as well.

Loading from a Class will ensure that the resource is loaded from a path
appropriate to the class. You probably don't need to get involved with
class-loaders directly yourself.

Tom Hawtin

Signature

Unemployed English Java programmer
http://jroller.com/page/tackline/

Reply to this Message

ClassLoader.getSystemResource Help

Free Magazines