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Jim Crowell · Guest

Hi,

I am developing a Form Centric Application using jdk11.3.1_09 on a Linux
System. On the Linux node, I create .jar files for testing my stand alone
app on a Win XP Pro System and an Apple PowerBook running Mac OS x.2.

I just started the test effort on the PowerBook and have discovered the
following problem:

I create a new instance of a JScrollPane [scrollPane]. I set the Vertical
Scroll Bar Policy to "scrollPane.VERTICAL_SCROLLBAR_AS_NEEDED".

To Control the LAF Colors I get a JScrollBar [vScrolllBar] instance of the
'scrollPane' Vertical Scroll Bar and set the background Color as follows:

JScrollBar vScrollBar = scrollPane.getVerticalScrollBar(); // Line 1
vScrollBar.getComponent(0),setBackground(Color.pink); // Line 2

The above works fine on the Linux and Win XP Systems. On the Mac OS X.2
system, I get an "ArrayIndexOutOfBounds" error on the 'getCommponent(0) line
[line 2 above].

Note: I also tried setting the Vertical Scroll Bar Policy with
"scrollPane.VERTICAL_SCROLLBAR_ALWAYS" and received the same error on the
Mac OS system.

It looks like the Mac OS [ver 1.3.1] does not add the Scroll Bar components
to the 'JScrollBar' instance until it is ready to display the Scroll Bar
whereas Linux and Win XP sets the components when the object is instanced.

Questions:
1. Is the above code poor in that I should have done a
'vScrollBar.getComponentCount()' check before assuming that the 'vScrollBar'
instance has setup the Scroll Bar Components?
2. Is there any place where I can see a list of 'jdk' platform differences
to assist my integration effort on the above platforms?

Thanks,
Jim.