Jfreechart沒有X11

Question

我使用Jfreechart來創建圖表。我正在創建圖表的BufferedImage並將其寫入OutputStream。

它的顯示環境工作正常，但其在headless環境中工作不正常。

請幫助你如何在這樣的環境中工作。

例外，我在日誌了：

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/WebAdmin] threw exception [Handler processing failed; nested exception is java.lang.InternalError: Can't connect to X11 window server using ':0.0' as the value of the DISPLAY variable.] with root cause 
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$200(X11GraphicsEnvironment.java:65) 
    at sun.awt.X11GraphicsEnvironment$1.run(X11GraphicsEnvironment.java:110) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at sun.awt.X11GraphicsEnvironment.<clinit>(X11GraphicsEnvironment.java:74) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Class.java:186) 
    at java.awt.GraphicsEnvironment.createGE(GraphicsEnvironment.java:102) 
    at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:81) 
    at sun.swing.SwingUtilities2.isLocalDisplay(SwingUtilities2.java:1457) 
    at javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:1556) 
    at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:148) 
    at javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1592) 
    at javax.swing.UIManager.setLookAndFeel(UIManager.java:536) 
    at javax.swing.UIManager.setLookAndFeel(UIManager.java:576) 
    at javax.swing.UIManager.initializeDefaultLAF(UIManager.java:1345) 
    at javax.swing.UIManager.initialize(UIManager.java:1455) 
    at javax.swing.UIManager.maybeInitialize(UIManager.java:1422) 
    at javax.swing.UIManager.getDefaults(UIManager.java:656) 
    at javax.swing.UIManager.getColor(UIManager.java:698) 
    at org.jfree.chart.JFreeChart.<clinit>(JFreeChart.java:263) 
    at org.jfree.chart.ChartFactory.createBarChart(ChartFactory.java:893) 

而且catalina.sh的一部分，我已經編輯：

# JSSE_HOME  (Optional) May point at your Java Secure Sockets Extension 
#     (JSSE) installation, whose JAR files will be added to the 
#     system class path used to start Tomcat. 
# 
# CATALINA_PID (Optional) Path of the file which should contains the pid 
#     of catalina startup java process, when start (fork) is used 
# 
# $Id: catalina.sh 609438 2008-01-06 22:14:28Z markt $ 
# ----------------------------------------------------------------------------- 

JAVA_OPTS="-Djava.awt.headless=true -Dfile.encoding=UTF-8 -server -Xms1536m 
-Xmx1536m -XX:NewSize=256m -XX:MaxNewSize=256m -XX:PermSize=256m 
-XX:MaxPermSize=256m -XX:+DisableExplicitGC" 

謝謝您的答覆。

Answer 1

您很可能希望在headless mode調用Java程序：

java -Djava.awt.headless=true -cp ... come.your.Class 

另外，在之前的任何圖形代碼（例如在static {}塊）運行時間：

System.setProperty("java.awt.headless", "true");