Name: gsC80088 Date: 01/04/99


Against JDK 1.2beta42:

getResourceAsStream returns poor InputStream
with returning always 1 to calling available().
This results in poor performance.
(Review ID: 40856)
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Name: gsC80088 Date: 03/01/99


I am having problems with with Class.getResourceAsStream(). I have seen several
bugs written about simailar problems,
all of which seem to have been marked as fixed.
For some reason, I am still having problems.


Configuration:
     Type of Java App: JApplet
     Browser: IE 4.0 or Netscape 4.5
     JRE: Java Plugin 1.1.1.
     Platform : Windows NT
     JDK 1.1.7

Symptoms :

I have two jar files A.jar and B.jar.
I want to call getResourceAsStream()on a resource file that resides in A.jar. The call to
getResourceAsStream() resides in a class in B.jar.

Example:
A.jar contains MyResource.txt

B.jar contains B.class which has the following
class:

public class B {
  public void getMyResource() {
     String resource = "MyResource.txt";
     InputStream inputStream =
       marker.getClass().getResourceAsStream(resource);

  // marker is an Object reference that refers
  // to my JApplet class. MyResource.txt is
  // in the same directory as the JApplet class.
}
}

Case 1) The above example will always return null
for inputStream if the code is run using JavaPlugin 1.1 from either IE or Netscape.

Case 2) If I run the same code as an application
using classes.zip and NO jar files, the resource
is found.

Case 3) If I run the same code using JRE 1.1.7
with jar files, the resource is also found with
no problem.

Case 4) If I run the same code using Netscape,
with NO jar files, with Java Plugin 1.1, the
resource is found as well.

I have proven that if I try to get the resource
in A.jar using a call from a method contained in
A.jar (namely from the JApplet itself), the resource is found. It appears that there is
some incompatability between Java Plugin and
resources in other jar files or other packages.

I have eliminated the possibility of this being a
file extension problem by renaming the resource
file MyResource.gif. The file is still not found
when accessed from B.jar. So I got crazy and
made one big horkin jar file containing the
contents of A and B. The resource is still not
found! It's as if the resource can't be found
when accessed from outside of it's package. So
you say, create an accessor method for the
resource and put the accessor in the package
where the resource resides. This didn't work
either.

Unfortunately, I have to use the Java Plugin for
this Applet, so I have to come up with some
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