java.awt.headless by default

[akostadinov]

Hi. I see some applications are failing to undeploy thus blocking server shutdown when java.awt.headless is not set. As well some are having issues running without that option.

One of them is hudson that fails to generate certain graphics when that option is not set. As well a user reported jboss failing to shutdown without the option - http://www.nabble.com/forum/ViewPost.jtp?post=13642773&framed=y

I saw also an old question about similar shutdown issue http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3995057#3995057

I don't know if that is just a bad application design but anyway wouldn't it be better to have that option set by default for JBoss AS? Will that generate any negative effects for other users?

[dimitris]

Once implication if we enable java.awt.headless by default is the startDatabaseManager() operation on jboss:service=Hypersonic,database=localDB won't work:

14:19:06,046 ERROR [HypersonicDatabase] Failed to start database manager
java.lang.reflect.InvocationTargetException
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.jboss.jdbc.HypersonicDatabase$1.run(HypersonicDatabase.java:528)
Caused by: java.awt.HeadlessException
 at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:1
59)
 at java.awt.Window.<init>(Window.java:317)
 at java.awt.Frame.<init>(Frame.java:419)
 at javax.swing.JFrame.<init>(JFrame.java:194)
 at org.hsqldb.util.DatabaseManagerSwing.main(Unknown Source)
 ... 5 more

[akostadinov]

I see..

So if one needs headless mode for an application then he will not be able to run the manager, or is there a way to have headless mode for the app only?
Or non headless mode for the manager only?

[dimitris]

That's a JVM property so it's all or nothing.