Re: Can't connect to X11 window server using '0:0' as the valueof the display and now java.awt.HeadlessException

[Georges Roux]

Hi,

Here is a good link:
   http://www.geocities.com/marcoschmidt.geo/java-image-faq.html#x
Hope you enjoy.
Georges
Stephen Riek wrote:

Thanks Micael. Tried the same thing and got the same results. 
Looks like Catalina/Tomcat is indeed using headless mode but
it's not working with my Java (1.4) and operating system (SunOS 5.6).
I'm presuming you're using this to create/generate graphics in a
servlet ?  Do you mind posting sample Java that creates a
Toolkit or MediaTracker (and which therefore requires headless 
mode) ? I can't fathom what's wrong with mine. Mine works fine
when running on Win2K and Tomcat, but now dying on Sun.
Thanks for the help,
Stephen.

Micael <[EMAIL PROTECTED]> wrote:
I added the headless flag to catalina.sh as follows:
# ----- Execute The Requested Command -----------------------------------------

echo "Using CATALINA_BASE: $CATALINA_BASE"
echo "Using CATALINA_HOME: $CATALINA_HOME"
echo "Using CATALINA_TMPDIR: $CATALINA_TMPDIR"
echo "Using JAVA_HOME: $JAVA_HOME"
if [ "$1" = "jpda" ] ; then
if [ -z "$JPDA_ADDRESS" ]; then
JPDA_ADDRESS="8000"
fi
if [ -z "$JDPA_OPTS" ]; then
JPDA_OPTS="-Xdebug 
-Xrunjdwp:transport=dt_socket,address=$JPDA_ADDRESS,server=y,suspend=n"
fi
CATALINA_OPTS="$CATALINA_OPTS $JPDA_OPTS"
shift
fi
CATALINA_OPTS="-Djava.awt.headless=true"

This worked fine.

At 08:15 AM 3/23/03 +0000, you wrote:

 

On Thu, 2003-03-20 at 20:36, Micael wrote:
For me the easiest thing was just to provide the right command line 
     

options
   

(java.awt.headless=true) when I started up Tomcat.
     

May I ask, how you did this ? I've also encountered
JNI_OnLoad errors runing on Solaris due, I suspect, the lack of
XWindows on my server. I tried adding the headless flag to
my catalina.sh script as follows ~
elif [ "$1" = "start" ] ; then
shift
touch "$CATALINA_BASE"/logs/catalina.out
if [ "$1" = "-security" ] ; then
echo "Using Security Manager"
shift
"$_RUNJAVA" $JAVA_OPTS $CATALINA_OPTS \
-Djava.endorsed.dirs="$JAVA_ENDORSED_DIRS" -classpath "$CLASSPATH" \
-Djava.security.manager \
-Djava.security.policy=="$CATALINA_BASE"/conf/catalina.policy \
-Dcatalina.base="$CATALINA_BASE" \
-Dcatalina.home="$CATALINA_HOME" \
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
-Djava.awt.headless=true \
org.apache.catalina.startup.Bootstrap "$@" start \
   

"$CATALINA_BASE"/logs/catalina.out 2>&1 &
       

else
"$_RUNJAVA" $JAVA_OPTS $CATALINA_OPTS \
-Djava.endorsed.dirs="$JAVA_ENDORSED_DIRS" -classpath "$CLASSPATH" \
-Dcatalina.base="$CATALINA_BASE" \
-Dcatalina.home="$CATALINA_HOME" \
-Djava.io.tmpdir="$CATALINA_TMPDIR" \
-Djava.awt.headless=true \
org.apache.catalina.startup.Bootstrap "$@" start \
   

"$CATALINA_BASE"/logs/catalina.out 2>&1 &
       

fi
But that just resulted in the following error,
java.awt.HeadlessException
at 
java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:121)
at java.awt.Window.(Window.java:266)
at java.awt.Frame.(Frame.java:398)
at java.awt.Frame.(Frame.java:363)
at ImageUtils.loadImage(Unknown Source)

where the loadImage() function is simply supposed to load an image,
public static Image loadImage(String fileName) {
Image image = Toolkit.getDefaultToolkit().getImage(fileName);
MediaTracker mediaTracker = new MediaTracker(new Frame());
mediaTracker.addImage(image, 0);
try {
mediaTracker.waitForID(0);
}
catch (InterruptedException ie) {
//
}
return image;
}
Any ideas/help would be great.
Stephen.
ps. I also tried PJA but couldn't get that to work either :(


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