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Re: [scala] problem with getResource

by Christos KK Loverdos :: Rate this Message:

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Hi Gregory,

Generally speaking, do not rely on classloaders to follow your path in the disk. Now, to your case, I cannot reproduce the behaviour (I have made the folder and files as in your case):

C:\>java-apps\scala-2.7.1-final\bin\scala -Xnojline
Welcome to Scala version 2.7.1.final (Java HotSpot(TM) Client VM, Java 1.6.0_07).
Type in expressions to have them evaluated.
Type :help for more information.

scala> new java.io.File("WorkspaceDecls")
res0: java.io.File = WorkspaceDecls

scala> res0.listFiles()
res1: Array[java.io.File] = Array(WorkspaceDecls\App.class, WorkspaceDecls\gemcutter.default.cws)

scala> java.lang.Thread.currentThread().getContextClassLoader()
res2: java.lang.ClassLoader = java.net.URLClassLoader@354093

scala> res2.getResource("WorkspaceDecls/gemcutter.default.cws")
res3: java.net.URL = file:/C://WorkspaceDecls/gemcutter.default.cws

Since in Scala 2.7.1 the context class loader is a URLClassLoader, please do the following, just to see if the folder containing WorkspaceDecls is the classpath of the classloader:

scala> res2.asInstanceOf[java.net.URLClassLoader].getURLs

If you don't see it here, then you get normal behaviour. Otherwise, we shall have to dig a little further :-)

BR
Christos

On 7/23/08, Meredith Gregory <lgreg.meredith@...> wrote:

Scalads and Lasses,

Please see the trace below. The method getResource on java.lang.Thread.currentThread().getContextClassLoader() is not behaving as i expect it would. It never returns anything but null as far as my experimentation has gone. Any help would be greatly appreciated.

Best wishes,

--greg

[INFO] [scala:console]
Welcome to Scala version 2.7.1.final (Java HotSpot(TM) Client VM, Java 1.5.0_13).
Type in expressions to have them evaluated.
Type :help for more information.

scala> new java.io.File("WorkspaceDecls")
new java.io.File("WorkspaceDecls")
new java.io.File("WorkspaceDecls")
res0: java.io.File = WorkspaceDecls

scala> res0.listFiles()
res0.listFiles()
res0.listFiles()
res1: Array[java.io.File] = Array(WorkspaceDecls/App.class, WorkspaceDecls/gemcutter.default.cws)

scala> java.lang.Thread.currentThread().getContextClassLoader()
java.lang.Thread.currentThread().getContextClassLoader()
java.lang.Thread.currentThread().getContextClassLoader()
res2: java.lang.ClassLoader = java.net.URLClassLoader@697c4

scala> res2.getResource("WorkspaceDecls/gemcutter.default.cws")
res2.getResource("WorkspaceDecls/gemcutter.default.cws")
res2.getResource("WorkspaceDecls/gemcutter.default.cws")
res3: java.net.URL = null

scala> new java.io.File(".").getCanonicalPath()
new java.io.File(".").getCanonicalPath()
new java.io.File(".").getCanonicalPath()
res4: java.lang.String = /Users/lgm/work/src/projex/bobj/magritte/pipe-cutter/pipes_to_cal

scala> res2.getResource(new java.io.File(".").getCanonicalPath() + "WorkspaceDecls/gemcutter.default.cws")
res2.getResource(new java.io.File(".").getCanonicalPath() + "WorkspaceDecls/gemcutter.default.cws")
res2.getResource(new java.io.File(".").getCanonicalPath() + "WorkspaceDecls/gemcutter.default.cws")
res5: java.net.URL = null

scala>

--
L.G. Meredith
Managing Partner
Biosimilarity LLC
806 55th St NE
Seattle, WA 98105

+1 206.650.3740

http://biosimilarity.blogspot.com

--
  __~O
-\ <,       Christos KK Loverdos
(*)/ (*)      http://ckkloverdos.com

« Return to Thread: [scala] problem with getResource

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