java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkit异常解决

处理一个老项目时遇到这样的BUG

Message javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkitDescription The server encountered an unexpected condition that prevented it from fulfilling the request.Exceptionorg.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkitorg.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:560)org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:461)org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)javax.servlet.http.HttpServlet.service(HttpServlet.java:729)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)haitong.servlets.security.BlockRequestFilter.doFilter(BlockRequestFilter.java:45)haitong.servlets.utils.DecoratorFilter.doFilter(DecoratorFilter.java:33)haitong.servlets.utils.HashedResourceFilter.doFilter(HashedResourceFilter.java:98)haitong.business.content.jsp.ShortcutFilter.doFilter(ShortcutFilter.java:142)haitong.servlets.utils.compressionFilters.CompressionFilter.doFilter(CompressionFilter.java:134)haitong.servlets.utils.SetEncodingFilter.doFilter(SetEncodingFilter.java:31)

经过多次试验及查阅，终于解决，记录一下，解决办法
在Tomcat/bin/catalina.sh 中加入一句话

JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true"

原因：
对于一个Java服务器来说经常要处理一些图形元素，例如地图的创建或者图形和图表等。这些API基本上总是需要运行一个X-server以便能使用AWT（Abstract Window Toolkit，抽象窗口工具集）。

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java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11.XToolkit异常解决

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