Recover gracefully when no graphics display is available
--------------------------------------------------------
Key: WICKET-699
URL: https://issues.apache.org/jira/browse/WICKET-699
Project: Wicket
Issue Type: Improvement
Components: wicket-examples
Affects Versions: 1.3.0-beta2
Reporter: Jean-Baptiste Quenot
Priority: Minor
Fix For: 1.3.0-final
When loading the captcha example with no graphics display, here is the error I
get:
{noformat}
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)
{noformat}
We could intercept this and recover gracefully, to instruct users in the wicket
example page how to setup the server for making this work.
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