如何解决iText 5中HtmlPipelineContext构造函数的非法反射访问问题？

上下文 #

• JDK11
• SpringBoot
• iTextPDF 5.5.13.3
• Ubuntu
• Eclipse

问题场景 #

执行new HtmlPipelineContext(null);、new CssAppliersImpl(new XMLWorkerFontProvider());以及自定义实现CssAppliersImpl（内部包含Map构建逻辑）时，控制台输出以下警告：

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.itextpdf.text.io.ByteBufferRandomAccessSource$1 (file:/home/awieclawski/.m2/repository/com/itextpdf/itextpdf/5.5.13.3/itextpdf-5.5.13.3.jar) to method java.nio.DirectByteBuffer.cleaner()
WARNING: Please consider reporting this to the maintainers of com.itextpdf.text.io.ByteBufferRandomAccessSource$1

同时调试new HtmlPipelineContext(null);时，触发异常：com.sun.jdi.ClassNotLoadedException: Type has not been loaded occurred invoking method.

前置代码 #

创建HtmlPipelineContext实例前的代码如下：

CSSResolver cssResolver = new StyleAttrCSSResolver();
cssResolver.addCss(cssFile);
//     cssFile 由 XMLWorkerHelper.getCSS(getCssStream(path)) 返回
}

解决方案 #

问题出在FontFactoryImp类的第503行，该行调用了静态方法BaseFont.enumerateTTCNames(path);。只需在实例化XMLWorkerFontProvider时传入XMLWorkerFontProvider.DONTLOOKFORFONTS参数，即可解决所有问题：

XMLWorkerFontProvider fontProvider = new XMLWorkerFontProvider(XMLWorkerFontProvider.DONTLOOKFORFONTS); 

修改后执行，上述警告和调试异常均已消失。

内容的提问来源于stack exchange，提问作者Andrzej Więcławski