如何配置Google AppEngine来处理矢量图形？
如何配置Google AppEngine来处理矢量图形？
提问于 2017-07-14 18:01:07
在带有Java8的AppEngine标准环境中，尝试使用SVG时会出现下一个错误。当我尝试使用POI在像slide.draw(graphics2D)这样的XSLFSlide上绘制SVG或者使用Batik将SVG转换为PNG时，我得到了这个错误。这个问题的出现似乎是因为fontconfig找不到字体。在debian发行版中，它通过安装libfontconfig1来解决。如何在AppEngine上解决？
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:443)
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.canDisplay(Font.java:1980)
at org.apache.poi.sl.draw.DrawTextParagraph.canDisplayUpTo(DrawTextParagraph.java:756)
at org.apache.poi.sl.draw.DrawTextParagraph.getAttributedString(DrawTextParagraph.java:640)
at org.apache.poi.sl.draw.DrawTextParagraph.breakText(DrawTextParagraph.java:248)
at org.apache.poi.sl.draw.DrawTextShape.drawParagraphs(DrawTextShape.java:159)
at org.apache.poi.sl.draw.DrawTextShape.getTextHeight(DrawTextShape.java:220)
at org.apache.poi.sl.draw.DrawTextShape.drawContent(DrawTextShape.java:102)
at org.apache.poi.sl.draw.DrawSimpleShape.draw(DrawSimpleShape.java:93)
at org.apache.poi.sl.draw.DrawSheet.draw(DrawSheet.java:71)
at org.apache.poi.sl.draw.DrawSlide.draw(DrawSlide.java:41)
at org.apache.poi.xslf.usermodel.XSLFSlide.draw(XSLFSlide.java:307)回答 1
Stack Overflow用户
回答已采纳
发布于 2017-11-04 12:01:51
我也遇到过同样的问题，并通过设置"sun.awt.fontconfig"系统属性显式地告诉AppEngine VM要获取特定的字体配置，从而设法解决了这个问题。尝试在源代码的最开始处插入以下代码(在使用任何字体或图形组件之前)：
String fontConfig = System.getProperty("java.home")
+ File.separator + "lib"
+ File.separator + "fontconfig.Prodimage.properties";
if (new File(fontConfig).exists())
System.setProperty("sun.awt.fontconfig", fontConfig);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/45100138
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