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jdk 11.0.16.1版本 生成图片验证码会报空指针异常

发布时间 2023-12-29 17:03:23作者: QChan

异常堆栈信息

java.lang.NullPointerException: null
        at java.desktop/sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)
        at java.desktop/sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:225)
        at java.desktop/sun.awt.FontConfiguration.init(FontConfiguration.java:107)
        at java.desktop/sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:719)
        at java.desktop/sun.font.SunFontManager$2.run(SunFontManager.java:379)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.SunFontManager.<init>(SunFontManager.java:324)
        at java.desktop/sun.awt.FcFontManager.<init>(FcFontManager.java:35)
        at java.desktop/sun.awt.X11FontManager.<init>(X11FontManager.java:56)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
        at java.desktop/sun.font.FontManagerFactory$1.run(FontManagerFactory.java:84)
        at java.base/java.security.AccessController.doPrivileged(Native Method)
        at java.desktop/sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
        at java.desktop/java.awt.Font.getFont2D(Font.java:497)
        at java.desktop/java.awt.Font$FontAccessImpl.getFont2D(Font.java:237)
        at java.desktop/sun.font.FontUtilities.getFont2D(FontUtilities.java:158)
        at java.desktop/sun.java2d.SunGraphics2D.checkFontInfo(SunGraphics2D.java:670)
        at java.desktop/sun.java2d.SunGraphics2D.getFontInfo(SunGraphics2D.java:836)
        at java.desktop/sun.java2d.pipe.GlyphListPipe.drawString(GlyphListPipe.java:46)
        at java.desktop/sun.java2d.pipe.ValidatePipe.drawString(ValidatePipe.java:165)
        at java.desktop/sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2934)
。。。省略其它业务代码

11.0.16.1 linux 平台对应源码\java.desktop\sun\awt\FontConfiguration.java。 getVersion() 是private 且不依赖外部参数

  private void readFontConfigFile(File f) {
        /* This is invoked here as readFontConfigFile is only invoked
         * once per VM, and always in a privileged context, thus the
         * directory containing installed fall back fonts is accessed
         * from this context
         */
        getInstalledFallbackFonts(javaLib);

        if (f != null) {
            try {
                FileInputStream in = new FileInputStream(f.getPath());
                if (isProperties) {
                    loadProperties(in);
                } else {
                    loadBinary(in);
                }
                in.close();
                if (FontUtilities.debugFonts()) {
                    logger.config("Read logical font configuration from " + f);
                }
            } catch (IOException e) {
                if (FontUtilities.debugFonts()) {
                    logger.config("Failed to read logical font configuration from " + f);
                }
            }
        }
        String version = getVersion();
        if (!"1".equals(version) && FontUtilities.debugFonts()) {
            logger.config("Unsupported fontconfig version: " + version);
        }
    }

解决： 小版本升级至11.0.20或以上即可