Tomcat不显示验证码

1.错误出现java.lang.NoClassDefFoundError: sun/awt/X11GraphicsEnvironment异常

异常信息如下：

Caused by: java.lang.NoClassDefFoundError: 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 sun.font.FontManager.initSGEnv(FontManager.java:1094)
at sun.font.FontManager.findFont2D(FontManager.java:1756)
at java.awt.Font.getFont2D(Font.java:452)
at java.awt.Font.canDisplay(Font.java:1835)
at java.awt.Font.canDisplayUpTo(Font.java:1901)
at java.awt.font.TextLayout.singleFont(TextLayout.java:451)
at java.awt.font.TextLayout.(TextLayout.java:509)
at com.ai.mapp.service.table.utils.ReportExportExcel.exportExcel(ReportExportExcel.java:70)
at com.ai.mapp.action.business.ReportDataAction.expReportExcel(ReportDataAction.java:362)
... 56 more

解决方案：

   在tomcat配置文件catalina.sh文件中添加 CATALINA_OPTS="-Djava