Setting Java ZWT.headless variable
I am creating graphics on the fly with the Oracle JVM in the database. I need to set the headless environment variable.
I found the command: -Djava.awt.headless=true
I can not find where this needs to be run.
Can this environment variable be set from the Java code?
I have this code from Sun which does not change the headless variable.
System.setProperty("java.awt.headless", "true");
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
boolean headless_check = ge.isHeadless();
if(headless_check)
htpPrint("<br/>headless<br/>");
else
htpPrint("<br/>not headless<br/>");
I am working with 11g and 10g.
Any help with this would be greatly appreciated.
Thanks,
Gregory
Message was edited by:
phillippio
Thanks Again Marcelo.
That set headless to true.
This, unfortunately did not fix issue.
I get the following error every time I try to create a BufferedImage in Java on the Database.
ORA-29532: Java call terminated by uncaught Java exception: java.lang.NullPointerException
The image I am trying to create is from a JFreeChart object.
BufferedImage bufferedImage = chart.createBufferedImage(500, 300);
Like I stated earlier this works in my desktop environmet. With Java 1.4.
The Stack if you are interested:
start. org.jfree.chart.JFreeChart@68ecbb34 This is a title to end all titles. 1.5.0_10 sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1236)
sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:170)
sun.awt.FontConfiguration.(FontConfiguration.java:75)
oracle.aurora.awt.OracleFontConfiguration.(OracleFontConfiguration.java:33)
oracle.aurora.awt.OracleGraphicsEnvironment.createFontConfiguration(OracleGraphicsEnvironment.java:25)
sun.java2d.SunGraphicsEnvironment$1.run(SunGraphicsEnvironment.java:186)
java.security.AccessController.doPrivileged(Native Method)
sun.java2d.SunGraphicsEnvironment.(SunGraphicsEnvironment.java:94)
oracle.aurora.awt.OracleGraphicsEnvironment.(OracleGraphicsEnvironment.java:14)
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
java.lang.reflect.Constructor.newInstance(Constructor.java:511)
java.lang.Class.newInstance0(Class.java:373)
java.lang.Class.newInstance(Class.java:326)
java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1141)
org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1397)
org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1378)
org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1363)
LASER_REP_MH_EVENTS_BARGRAPH.buildGraph(LASER_MH_EVENTS_GRAPH_JV:135)
If you have any idea on running JFreeChart on the DB JVM I would like to hear them.
Thanks for your help.
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