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java.lang.NullPointerException: 	at sun.font.FontManager.getDefaultPlatformFont(FontManager.java:3409)	at sun.java2d.SunGraphicsEnvironment$2.run(SunGraphicsEnvironment.java:263)	at java.security.AccessController.doPrivileged(Native Method)	at sun.java2d.SunGraphicsEnvironment.(SunGraphicsEnvironment.java:164)	at sun.awt.X11GraphicsEnvironment.(X11GraphicsEnvironment.java:254)	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:534)	at java.lang.Class.newInstance(Class.java:379)	at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:82)	at sun.font.FontManager.initSGEnv(FontManager.java:1121)	at sun.font.FontManager.findFont2D(FontManager.java:1876)	at java.awt.Font.getFont2D(Font.java:477)	at java.awt.Font.getFamily(Font.java:1198)	at java.awt.Font.getFamily_NoClientCode(Font.java:1172)	at java.awt.Font.getFamily(Font.java:1164)	at java.awt.Font.toString(Font.java:1661)	at hudson.util.ChartUtil.(ChartUtil.java:229)	at hudson.WebAppMain.contextInitialized(WebAppMain.java:181)	at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:782)	at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424)	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:774)	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249)	at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1242)	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:717)	at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:494)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)	at org.eclipse.jetty.server.handler.HandlerWrapper.doStart(HandlerWrapper.java:95)	at org.eclipse.jetty.server.Server.doStart(Server.java:282)	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)	at winstone.Launcher.(Launcher.java:154)	at winstone.Launcher.main(Launcher.java:354)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:622)	at Main._main(Main.java:293)	at Main.main(Main.java:98)