Java 如何在Docker中运行的Openjdk 8中安装一些默认字体
我有一个基于Java的Docker文件应用程序- 一个问题是DockerFile似乎没有安装任何字体,这导致我的应用程序出现此错误Java 如何在Docker中运行的Openjdk 8中安装一些默认字体,java,docker,Java,Docker,我有一个基于Java的Docker文件应用程序- 一个问题是DockerFile似乎没有安装任何字体,这导致我的应用程序出现此错误 java.lang.NullPointerException at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264) at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)
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.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$1.run(FontManagerFactory.java:83)
at java.security.AccessController.doPrivileged(Native Method)
at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
at java.awt.Font.getFont2D(Font.java:491)
at java.awt.Font.canDisplayUpTo(Font.java:2060)
at java.awt.font.TextLayout.singleFont(TextLayout.java:470)
at java.awt.font.TextLayout.<init>(TextLayout.java:531)
at org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:275)
at org.apache.poi.xssf.streaming.AutoSizeColumnTracker.<init>(AutoSizeColumnTracker.java:117)
at org.apache.poi.xssf.streaming.SXSSFSheet.<init>(SXSSFSheet.java:79)
at org.apache.poi.xssf.streaming.SXSSFWorkbook.createAndRegisterSXSSFSheet(SXSSFWorkbook.java:656)
at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:677)
at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:83)
at com.jthink.songkong.reports.spreadsheet.Worksheet.<init>(Worksheet.java:23)
at com.jthink.songkong.reports.spreadsheet.BasicWorksheet.<init>(BasicWorksheet.java:15)
at com.jthink.songkong.reports.spreadsheet.SpreadsheetReport.<init>(SpreadsheetReport.java:51)
at com.jthink.songkong.reports.fixsongsreport.SpreadsheetReportSection.outputReport(SpreadsheetReportSection.java:82)
at com.jthink.songkong.reports.FixSongsReport.outputSpreadsheet(FixSongsReport.java:1033)
at com.jthink.songkong.reports.FixSongsReportCreator.createReport(FixSongsReportCreator.java:122)
at com.jthink.songkong.analyse.toplevelanalyzer.FixSongsController.start(FixSongsController.java:329)
at com.jthink.songkong.server.callback.ServerFixSongs$Task.run(ServerFixSongs.java:448)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
安装字体
因此,我将字体添加到应用程序下载中,然后添加
CMD fc-cache -rv /opt/songkong/fonts;
到我的DockerFile,但它没有起作用
可能这不是正确的方法,是否有正确的方法。您的包含语义错误。您有两个CMD
命令
:
Dockerfile中只能有一条CMD指令。如果你列出
多个命令,则只有最后一个命令生效
因此,fc cache
命令将不会执行。将CMD
替换为fc cache
之前的RUN
从
我发现fp缓存不作为openjdk:8-jre-alpine发行版的一部分存在
但加入:
RUN apk --no-cache add msttcorefonts-installer fontconfig && \
update-ms-fonts && \
fc-cache -f
在我的DockerFile中,不仅添加了fc缓存
,还安装了一组默认字体
这就是解决Java问题所需要的全部(我还可以删除
fc cache-rv/opt/songkong/font
行),并允许我使用雅加达poi库创建Excel电子表格。我尝试过,但当我构建dockerfile时,它抱怨-Build失败:命令'/bin/sh-c fc cache-rv/opt/songkong/font;'返回一个非零代码:127ok计算出fp cache cmd不可用,但这看起来很有趣,谢谢分享。虽然我也使用openjdk:8-jre-alpine,但它对我不起作用。仍在获取NullPointerException:(
RUN apk --no-cache add msttcorefonts-installer fontconfig && \
update-ms-fonts && \
fc-cache -f