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我有四个虚拟服务器，它们都是从原始系统克隆的。我在所有四个上都安装了 javamelody，但在其中两个上，图表没有出现在监控页面中。其他图像显示正常。我在两台无法正常工作的服务器上收到以下错误。

我找到了要添加的建议：-Djava.awt.headless=true 但是两个正常工作的服务器没有这个。有什么建议么？

这是错误的堆栈跟踪：

java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11GraphicsEnvironment
      at java.lang.Class.forName0(Native Method)
      at java.lang.Class.forName(Class.java:169)
      at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(GraphicsEnvironment.java:68)
      at java.awt.image.BufferedImage.createGraphics(BufferedImage.java:1135)
      at org.jrobin.graph.ImageWorker.resize(Unknown Source)
      at org.jrobin.graph.ImageWorker.<init>(Unknown Source)
      at org.jrobin.graph.RrdGraph.<init>(Unknown Source)
      at net.bull.javamelody.JRobin.graph(JRobin.java:217)
      at net.bull.javamelody.MonitoringController.doGraph(MonitoringController.java:342)
      at net.bull.javamelody.MonitoringController.doReport(MonitoringController.java:168)
      at net.bull.javamelody.MonitoringController.doActionIfNeededAndReport(MonitoringController.java:141)
      at net.bull.javamelody.MonitoringFilter.doMonitoring(MonitoringFilter.java:340)
      at net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:170)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
      at java.lang.Thread.run(Thread.java:619)`
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