[WICKET-699] Recover gracefully when no graphics display is available

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.3.0-beta2
• Fix Version/s: 1.3.0-beta3
• Component/s: wicket-examples
• Assignee: Unassigned
• Reporter: Jean-Baptiste Quenot
• Created: 26/Jun/07 14:47
• Updated: 26/Jul/07 03:24
• Resolved: 26/Jul/07 03:24

Description

When loading the captcha example with no graphics display, here is the error I get:

Caused by: java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.
        at sun.awt.X11GraphicsEnvironment.initDisplay(Native Method)
        at sun.awt.X11GraphicsEnvironment.access$000(X11GraphicsEnvironment.java:53)
        at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:142)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:131)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:164)
        at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
        at sun.font.FontManager.initSGEnv(FontManager.java:953)
        at sun.font.FontManager.findFont2D(FontManager.java:1115)
        at java.awt.Font.getFont2D(Font.java:358)
        at java.awt.Font.defaultLineMetrics(Font.java:1816)
        at java.awt.Font.getLineMetrics(Font.java:1902)
        at java.awt.font.TextLayout.fastInit(TextLayout.java:679)
        at java.awt.font.TextLayout.<init>(TextLayout.java:480)
        at org.apache.wicket.extensions.markup.html.captcha.CaptchaImageResource.<init>(CaptchaImageResource.java:192)
        at org.apache.wicket.extensions.markup.html.captcha.CaptchaImageResource.<init>(CaptchaImageResource.java:155)
        at org.apache.wicket.examples.captcha.Captcha$CaptchaForm.<init>(Captcha.java:53)
        at org.apache.wicket.examples.captcha.Captcha.<init>(Captcha.java:116)

We could intercept this and recover gracefully, to instruct users in the wicket example page how to setup the server for making this work.

Similar issue on images example:

java.lang.NoClassDefFoundError
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:164)
	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
	at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1141)
	at java.awt.image.BufferedImage.getGraphics(BufferedImage.java:1131)
	at org.apache.wicket.examples.images.Home$1.newResource(Home.java:109)
	at org.apache.wicket.ResourceReference.bind(ResourceReference.java:148)
	at org.apache.wicket.markup.html.image.resource.LocalizedImageResource.bind(LocalizedImageResource.java:184)
	at org.apache.wicket.markup.html.image.resource.LocalizedImageResource.setResourceReference(LocalizedImageResource.java:239)
	at org.apache.wicket.markup.html.image.Image.setImageResourceReference(Image.java:177)
	at org.apache.wicket.markup.html.image.Image.(Image.java:101)
	at org.apache.wicket.markup.html.image.Image.(Image.java:76)
	at org.apache.wicket.examples.images.Home.(Home.java:82)