報文

java.lang.NullPointerException: nullat 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.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)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 org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:273)at org.apache.poi.xssf.streaming.AutoSizeColumnTracker.<init>(AutoSizeColumnTracker.java:117)at org.apache.poi.xssf.streaming.SXSSFSheet.<init>(SXSSFSheet.java:82)at org.apache.poi.xssf.streaming.SXSSFWorkbook.createAndRegisterSXSSFSheet(SXSSFWorkbook.java:684)at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:705)at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:88)at com.alibaba.excel.util.WorkBookUtil.createSheet(WorkBookUtil.java:86)at com.alibaba.excel.context.WriteContextImpl.createSheet(WriteContextImpl.java:223)at com.alibaba.excel.context.WriteContextImpl.initSheet(WriteContextImpl.java:203)at com.alibaba.excel.context.WriteContextImpl.currentSheet(WriteContextImpl.java:135)at com.alibaba.excel.write.ExcelBuilderImpl.addContent(ExcelBuilderImpl.java:54)at com.alibaba.excel.ExcelWriter.write(ExcelWriter.java:73)at com.alibaba.excel.ExcelWriter.write(ExcelWriter.java:50)at com.alibaba.excel.write.builder.ExcelWriterSheetBuilder.doWrite(ExcelWriterSheetBuilder.java:62)at com.zhjs.service.adminApi.impl.OrdersServiceImpl.getOrdersByTimeDownload(OrdersServiceImpl.java:856)at com.zhjs.service.adminApi.impl.OrdersServiceImpl$$FastClassBySpringCGLIB$$38a1f102.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy.invokeMethod(CglibAopProxy.java:386)at org.springframework.aop.framework.CglibAopProxy.access$000(CglibAopProxy.java:85)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:704)at com.zhjs.service.adminApi.impl.OrdersServiceImpl$$EnhancerBySpringCGLIB$$c27489a.getOrdersByTimeDownload(<generated>)at com.zhjs.controller.adminApi.OrdersController.getOrdersByTimeDownload(OrdersController.java:135)at com.zhjs.controller.adminApi.OrdersController$$FastClassBySpringCGLIB$$c39ae25c.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708)at com.zhjs.controller.adminApi.OrdersController$$EnhancerBySpringCGLIB$$9ed1605c.getOrdersByTimeDownload(<generated>)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1071)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:964)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:779)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

在本地測試沒問題，部署到Docker就導出報錯。
原因：這是一個典型的 Java AWT / 字體渲染相關的異常，原因跟 服務器環境（無圖形環境）下使用自動列寬計算 相關。
找了很多資料，有很多方法，而我也嘗試了很多，最終解決更換了jdk。之前使用的是openjdk:8-jdk-alpine,換成了支持有字體的openjdk:oraclelinux8，然后重新打包部署就可以正常導出了。