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java.lang.NullPointerException: 	at sun.awt.X11FontManager.getDefaultPlatformFont(X11FontManager.java:779)	at sun.font.SunFontManager$2.run(SunFontManager.java:433)	at java.security.AccessController.doPrivileged(Native Method)	at sun.font.SunFontManager.(SunFontManager.java:376)	at sun.awt.X11FontManager.(X11FontManager.java:32)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at java.lang.Class.newInstance(Class.java:383)	at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)	at java.security.AccessController.doPrivileged(Native Method)	at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)	at sun.font.SunFontManager.getInstance(SunFontManager.java:250)	at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:264)	at sun.java2d.SunGraphics2D.getFontMetrics(SunGraphics2D.java:819)	at org.jfree.chart.plot.MeterPlot.drawTick(MeterPlot.java:1116)	at org.jfree.chart.plot.MeterPlot.drawArcForInterval(MeterPlot.java:941)	at org.jfree.chart.plot.MeterPlot.draw(MeterPlot.java:858)	at org.jfree.chart.JFreeChart.draw(JFreeChart.java:1229)	at org.jfree.chart.JFreeChart.createBufferedImage(JFreeChart.java:1399)