問題描述

在部署一個驗證碼服務的容器服務時遇到了一個空指標錯誤，錯誤程式碼為：

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.access$000(Font.java:224)
    at java.awt.Font$FontAccessImpl.getFont2D(Font.java:228)
    at sun.font.FontUtilities.getFont2D(FontUtilities.java:180)
    at sun.font.StandardGlyphVector.initFontData(StandardGlyphVector.java:1126)
    at sun.font.StandardGlyphVector.init(StandardGlyphVector.java:1115)
    at sun.font.StandardGlyphVector.<init>(StandardGlyphVector.java:167)
    at java.awt.Font.createGlyphVector(Font.java:2545)
    at nl.captcha.text.renderer.DefaultWordRenderer.render(Unknown Source)
    at nl.captcha.Captcha$Builder.addText(Unknown Source)
    at com.liferay.portal.captcha.simplecaptcha.SimpleCaptchaImpl.getSimpleCaptcha(SimpleCaptchaImpl.java:243)
    at com.liferay.portal.captcha.simplecaptcha.SimpleCaptchaImpl.serveImage(SimpleCaptchaImpl.java:159)
    at com.liferay.portal.captcha.CaptchaImpl.serveImage(CaptchaImpl.java:100)
    at com.liferay.portal.kernel.captcha.CaptchaUtil.serveImage(CaptchaUtil.java:78)
    at com.liferay.portal.captcha.CaptchaPortletAction.serveResource(CaptchaPortletAction.java:42)

在仔細搜尋了一番後，發現github上的一個描述比較相似：

https://github.com/docker-library/openjdk/issues/73

解決方法

經過了解，知道是因為alpine中缺少FontConfiguration，那麼就考慮安裝ttf-dejavu這個軟體。

在http://blog.csdn.net/freewebsys/article/details/53816615找到了解決辦法。

在伺服器適當位置位置建立一個Dockerfile，內容為：

FROM java:8-jre-alpine
# Install cURL
RUN echo -e "https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/main\n\
https://mirror.tuna.tsinghua.edu.cn/alpine/v3.4/community" > /etc/apk/repositories

RUN apk --update add curl bash ttf-dejavu && \
      rm -rf /var/cache/apk/*

重新打包 重新執行後 驗證碼出來了