1、java.lang.NullPointerException编辑
问题现象：
仪表板组件导出Excel后，打开Excel报错：errorCode:500, errorMsg: java.lang.NullPointerException，如下图：
查看FineBI日志%FineBI%/logs/fanruan.log，对应的报错如下：
java.lang.NullPointerException
at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)
at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)
at sun.awt.FontConfiguration.init(FontConfiguration.java:107)
at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:774)
at sun.font.SunFontManager$2.run(SunFontManager.java:431)
at java.security.AccessController.doPrivileged(Native Method)
at sun.font.SunFontManager.<init>(SunFontManager.java:376)
at sun.awt.FcFontManager.<init>(FcFontManager.java:35)
at sun.awt.X11FontManager.<init>(X11FontManager.java:57)
at sun.reflect.GeneratedConstructorAccessor654.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at java.lang.Class.newInstance(Class.java:442)
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 java.awt.Font.getFont2D(Font.java:491)
at java.awt.Font.canDisplayUpTo(Font.java:2060)
at java.awt.font.TextLayout.singleFont(TextLayout.java:470)
at java.awt.font.TextLayout.<init>(TextLayout.java:531)
at com.fr.third.v2.org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:254)
原因分析：
该报错是由于linux系统没有相关font资源导致，需要为系统安装字体管理器；
解决方案：
在linux中执行如下命令安装字体管理：
yum install fontconfig如果使用docker制作基础镜像运行以下命令：
RUN yum -y install fontconfig
RUN fc-cache --force