[izpack-devel] New panel creation

[Bartz, Klaus]

Hi Riaan,
it is really non-specific for IzPack.
The serialVersionUID will be used by the Java Virtual Machine at
deserializing.
Since some time all classes which are Serializable should have an
explicit
declared serialVersionUID. All GUI related classes are Serializable.  If
you use Eclipse
with the default settings and with VM 5.0 (also known as 1.5) you got
warnings
about missing serialVersionUID.
For more see the basic java docu or gooogle. See e.g. 
 
http://today.java.net/pub/a/today/2006/03/09/serialVersionUIDSQ8.html
 
Cheers
 
Klaus

	-----Original Message-----
	From: izpack-devel-bounces at lists.berlios.de
[mailto:izpack-devel-bounces at lists.berlios.de] On Behalf Of Zycor.net
Development Solutions
	Sent: Tuesday, March 06, 2007 8:03 AM
	To: izpack-devel at lists.berlios.de
	Subject: [izpack-devel] New panel creation
	
	
	Sorry, just hit reply and didn't change the subject...
	
	I changed the build script, so panels should be in the right
places... It seems that the problem was somehow with my panel... 
	I'm starting from scratch. I have now gotten a copy of the
HelloPanel to work.
	
	Still need an answer on this though:
	
	Also, what is the 'private static final long serialVersionUID =
3257848774955905587L;' on each panel? How do I generate this?
	
	Thanks
	
Riaan Cornelius  Software Developer - B.Sc(IT)  -  neo at zycor.net	
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	Zycor.net Development Solutions wrote: 

		Hi,
		
		I get the following exception when I try to create my
own panels. Why is this? Even if I just rename the HelloPanel and
recompile, create Jar and copy Jar and Class files into bin folder, this
happens.
		
		//===================== Start of Trace
========================//
		No custom langpack available.
		Can not find optional resource conditions.xml
		No specification for conditions found.
		Resource customicons.xml not defined. No custom icons
available.
		java.lang.reflect.InvocationTargetException
		        at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
		
		        at
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
		
		        at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
		rce)
		        at
java.lang.reflect.Constructor.newInstance(Unknown Source)
		        at
com.izforge.izpack.installer.InstallerFrame.loadPanels(InstallerFrame
		.java:336)
		        at
com.izforge.izpack.installer.InstallerFrame.<init>(InstallerFrame.jav
		a:256)
		        at
com.izforge.izpack.installer.GUIInstaller.loadGUI(GUIInstaller.java:4
		27)
		        at
com.izforge.izpack.installer.GUIInstaller.access$100(GUIInstaller.jav
		a:79)
		        at
com.izforge.izpack.installer.GUIInstaller$2.run(GUIInstaller.java:148
		)
		        at
java.awt.event.InvocationEvent.dispatch(Unknown Source)
		        at java.awt.EventQueue.dispatchEvent(Unknown
Source)
		        at
java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
		        at
java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
		        at
java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
		        at
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
		        at
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
		        at java.awt.EventDispatchThread.run(Unknown
Source)
		Caused by: java.lang.NullPointerException
		        at java.awt.Container.addImpl(Unknown Source)
		        at java.awt.Container.add(Unknown Source)
		        at
com.izforge.izpack.panels.MSDEPanel.<init>(MSDEPanel.java:106)
		        at
com.izforge.izpack.panels.MSDEPanel.<init>(MSDEPanel.java:64)
		        ... 17 more
		//===================== End of Trace
========================//
		
		Also, what is the 'private static final long
serialVersionUID = 3257848774955905587L;' on each panel? How do I
generate this?
		
		Regards
		
Riaan Cornelius  Software Developer - B.Sc(IT)  -  neo at zycor.net	
Ask an Expert - Visit my Virtual Office at Kasamba
<http://www.kasamba.com/Advice/VirtualOffice/ViewExpert.aspx?hE_x002F_LQ
gGt_x002B_kFYNCfS2_x002F_PTa5dl08QtDMq_x002B_vNnpiXfkC_x002B_0JhFyjXBf6T
80Eopgpc_x002F_nqY6hjWiws56Ypu4tAD2Mw1bmvUI_x002F_GBarL>
Get Thunderbird <http://www.mozilla.org/products/thunderbird/> 	
		
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