Name: vrR10176 Date: 04/17/2001



Api spec (jdk1.4.0beta-b59) says about method
javax.imageio.ImageWriteParam.getCompressionTypes():
"public String[] getCompressionTypes()
  Returns a list of available compression types, as an array or Strings, or null if a
  compression type may not be chosen using these interfaces. The array returned is a copy.
...
Throws:
UnsupportedOperationException - if the writer does not support compression."

But the method does not throw UnsupportedOperationException when the writer does
not support compression.

This bug causes failure of new JCK test:
api/javax_imageio/ImageWriteParam/index.html#getCompressionTypes

To reproduce the issue execute following test.
------------------------ test.java ------------------------
import javax.imageio.ImageWriteParam;

public class test {

public static void main(String[] argv) {
ImageWriteParam imagewriteparam = new ImageWriteParam(null);
try{
System.out.println("canWriteCompressed() returns " + imagewriteparam.canWriteCompressed());
imagewriteparam.getCompressionTypes();
System.out.println("Test failed. UnsupportedOperationException was expected");
} catch (UnsupportedOperationException e) {
System.out.println("Test passed");
}
}
}
------------ Logs ------------------------------------------
$ java -version
java version "1.4.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta-b60)
Java HotSpot(TM) Client VM (build 1.4.0-beta-b60, mixed mode)

$ javac test.java

$ java test
canWriteCompressed() returns false
Test failed. UnsupportedOperationException was expected

-----------------------------------------------

======================================================================