> From: Michael Anstis [mailto:michael.ans...@gmail.com]
> Subject: Tomcat 6: Classloading: META-INF\services: Nested JARs
> ClassLoader.getSystemResources("META-INF/services/AFile)
We'll assume that the missing closing quotation mark is a typo.
> However the file is not found.
Nor should it be; let's read the API spec:
getSystemResources
public static Enumeration<URL> getSystemResources(String name)
throws IOException
Finds all resources of the specified name from the search path used to load
classes. The resources thus found are returned as an Enumeration of URL objects.
The search order is described in the documentation for
getSystemResource(String).
getSystemResource
public static URL getSystemResource(String name)
Find a resource of the specified name from the search path used to load
classes. This method locates the resource through the system class loader (see
getSystemClassLoader()).
Note that the getSystemResources() method is *static*, so it's unrelated to the
your webapp's classloader. This is further clarified by the doc for
getSystemResource(), which explicitly says it uses only the system class loader
(hence the use of the word "system" in the method names).
> Am I doing something stupid? Should this work?
Yes. No.
You need to use an instance method of your webapp's classloader;
getResourceAsStream() is usually recommended, since that keeps the operation
independent of the file system (even in cases where there isn't one, such as
inside a JAR). Thread.currentThread().getContextClassLoader() is a way to get
a reference to your current classloader, assuming you're running inside a
servlet.
- Chuck
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