Learn Grid

Local에서 개발할때나, Contatiner환경이 아닌 경우에 발생하는 이슈중 하나. 즉 Docker환경의 톰캣에서 나는 오류.

sheet.autoSizeColumn(i);

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.ss.util.SheetUtil.getColumnWidth(SheetUtil.java:250)
        at org.apache.poi.ss.util.SheetUtil.getColumnWidth(SheetUtil.java:235)
        at org.apache.poi.xssf.usermodel.XSSFSheet.autoSizeColumn(XSSFSheet.java:549)
        at org.apache.poi.xssf.usermodel.XSSFSheet.autoSizeColumn(XSSFSheet.java:531)

현시점의 tomcat:8-jre8-alpine베이스에서 발생함.

Tomcat Image를 빌드할때 문제되는 라이브러리를 추가해줘야함.

RUN apk update && apk add --no-cache fontconfig ttf-dejavu

FROM tomcat:8-jre8-alpine
RUN rm -rf /usr/local/tomcat/webapps/ROOT
RUN rm -rf /usr/local/tomcat/webapps/docs
RUN rm -rf /usr/local/tomcat/webapps/examples
RUN rm -rf /usr/local/tomcat/webapps/host-manager
RUN rm -rf /usr/local/tomcat/webapps/manager
COPY context.xml /usr/local/tomcat/conf/context.xml
COPY server.xml /usr/local/tomcat/conf/server.xml
RUN apk update && apk add --no-cache fontconfig ttf-dejavu
COPY myapp.war /usr/local/tomcat/webapps/ROOT.war
EXPOSE 8080
CMD ["catalina.sh", "run"]