Passing a block to JButton.new results in NPE
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Key: JRUBY-4087
URL: http://jira.codehaus.org/browse/JRUBY-4087
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.4.0RC1
Reporter: Charles Oliver Nutter
Assignee: Charles Oliver Nutter
The following code produces an NPE:
{noformat}
include Java
import javax.swing.JButton
import javax.swing.JFrame
class JButton
def initialize(name, &block)
super(name)
# Not using the block yet, but will later.
end
end
class GUI < JFrame
def initialize
super('Title')
ok_button = JButton.new('OK') { puts 'pressed OK' }
content_pane.add(ok_button)
pack
self.default_close_operation = JFrame::EXIT_ON_CLOSE
end
end
GUI.new.visible = true
{noformat}
It has been bisected back to c306f7f4b19162a83c1fa8f3b983e7e6c70083d9 as the
original culprit. Note that the block passed to JButton.new is getting
converted to an Icon instance and that causes the blowup. Here's the trace:
{noformat}
Swing$ jruby gui.rb
pressed OK
org/jruby/javasupport/JavaUtil.java:922:in `convertRubyToJavaInt':
java.lang.NullPointerException: null (NativeException)
from org/jruby/gen/org/jruby/gen/InterfaceImpl271097958.gen:13:in
`getIconWidth'
from javax/swing/SwingUtilities.java:890:in `layoutCompoundLabelImpl'
from javax/swing/SwingUtilities.java:817:in `layoutCompoundLabel'
from javax/swing/plaf/basic/BasicGraphicsUtils.java:262:in
`getPreferredButtonSize'
from apple/laf/CUIAquaButton.java:450:in `getPreferredSize'
from javax/swing/JComponent.java:1624:in `getPreferredSize'
from java/awt/BorderLayout.java:690:in `preferredLayoutSize'
from java/awt/Container.java:1558:in `preferredSize'
... 10 levels...
from gui.rb:15:in `initialize'
from gui.rb:22:in `new_proxy'
from gui.rb:22
Swing$ jruby -v
jruby 1.4.0RC1 (ruby 1.8.7 patchlevel 174) (2009-09-30 80c263b) (Java
HotSpot(TM) Client VM 1.5.0_19) [i386-java]
{noformat}
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