NoClassDefFoundError：无法初始化类 sun.awt.X11FontManager

Question

当我们从 Oracle JDK-8 迁移到 Open JDK-11 时，Apache POI excel 生成有问题

已经试过了 -Djava.awt.headless=true

org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoClassDefFoundError: Could not initialize class sun.awt.X11FontManager
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1053)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:901)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)```

Answer 1

如果您使用的是 openjdk 的 docker ' slim images'，则该图像不再包含包 'fontconfig' 和 'libfreetype6'。

查看openjdk:11-slim的docker文件和openjdk:8-slim的docker文件的区别。

您可以选择另一个 docker 映像（例如openjdk:11-windowsservercore），也可以自己在 docker 文件中安装软件包：

RUN apt-get update; apt-get install -y fontconfig libfreetype6