Whenever I try to apply a style to a JMenu or a JMenuItem (via Synth) I get a lot of NullPointerExceptions whenever I hover or click the JMenuItems or the JMenu itself, the stack trace isn't giving me any useful information and doesn't point anywhere at any of my source files.
I am loading the file correctly and it does display the styles (apart from the background colors but that's aside) the problem is that I get a lot of Exceptions while everything is working just fine, the program doesn't crash.
this is the synth LookAndFeel.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<synth>
<style id="menuBarStyle">
<state>
<color value="GRAY" type="BACKGROUND"/>
</state>
</style>
<bind style="menuBarStyle" type="region" key="MenuBar"/>
<style id="menuStyle">
<insets top="5" bottom="3" right="10" left="10"/>
<state>
<color value="RED" type="BACKGROUND"/>
</state>
</style>
<bind style="menuStyle" type="region" key="Menu"/>
<style id="menuItemStyle">
<insets top="5" bottom="5" left="10" right="3"/>
<state>
<color value="GREEN" type="BACKGROUND"/>
</state>
</style>
<bind style="menuItemStyle" type="region" key="MenuItem"/>
<style id="menuItemAcceleratorStyle">
<state>
<color value="GRAY" type="BACKGROUND"/>
</state>
</style>
<bind style="menuItemAcceleratorStyle" type="region" key="MenuItem"/>
</synth>
This is how I load the file:
private void initUI() {
try {
SynthLookAndFeel laf = new SynthLookAndFeel();
laf.load(getClass().getClassLoader().getResourceAsStream("LookAndFeel.xml"), getClass());
UIManager.setLookAndFeel(laf);
} catch (ParseException e) {
e.printStackTrace();
} catch (UnsupportedLookAndFeelException e) {
e.printStackTrace();
}
}
And this is the stack trace (printed repeatedly whenever there is an interaction with the styled components):
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at sun.font.FontDesignMetrics$MetricsKey.init(FontDesignMetrics.java:217)
at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:286)
at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1113)
at javax.swing.JComponent.getFontMetrics(JComponent.java:1626)
at sun.swing.MenuItemLayoutHelper.reset(MenuItemLayoutHelper.java:125)
at javax.swing.plaf.synth.SynthMenuItemLayoutHelper.<init>(SynthMenuItemLayoutHelper.java:119)
at javax.swing.plaf.synth.SynthGraphicsUtils.paint(SynthGraphicsUtils.java:501)
at javax.swing.plaf.synth.SynthMenuItemUI.paint(SynthMenuItemUI.java:281)
at javax.swing.plaf.synth.SynthMenuItemUI.update(SynthMenuItemUI.java:245)
at javax.swing.JComponent.paintComponent(JComponent.java:780)
at javax.swing.JComponent.paint(JComponent.java:1056)
at javax.swing.JComponent.paintChildren(JComponent.java:889)
at javax.swing.JComponent.paint(JComponent.java:1065)
at javax.swing.JComponent.paintChildren(JComponent.java:889)
at javax.swing.JComponent.paint(JComponent.java:1065)
at javax.swing.JComponent.paintChildren(JComponent.java:889)
at javax.swing.JComponent.paint(JComponent.java:1065)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:586)
at javax.swing.JComponent.paintChildren(JComponent.java:889)
at javax.swing.JComponent.paint(JComponent.java:1065)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5210)
at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1579)
at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1502)
at javax.swing.RepaintManager.paint(RepaintManager.java:1272)
at javax.swing.JComponent._paintImmediately(JComponent.java:5158)
at javax.swing.JComponent.paintImmediately(JComponent.java:4969)
at javax.swing.RepaintManager$4.run(RepaintManager.java:831)
at javax.swing.RepaintManager$4.run(RepaintManager.java:814)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:814)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:789)
at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:738)
at javax.swing.RepaintManager.access$1200(RepaintManager.java:64)
at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1732)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
I suspect that the problem has something to do with Synth itself rather than my code I suppose, I tried looking up on the internet and in the java documentation and tutorials on Synth but couldn't find anything relevant.
P.S: I call this method before I start displaying or creating any swing components.