处理某些 PDF 时提示缺少 Bouncy Castle 类
麻烦作者大大在打包程序时 将 bcprov-jdk15on.jar 一起打包进 classpath，或使用 shadow/fat jar 方式合并依赖
报错信息如下
java.lang.NoClassDefFoundError: org/bouncycastle/asn1/ASN1OctetString
at com.itextpdf.text.pdf.PdfEncryption.<init>(PdfEncryption.java:147)
at com.itextpdf.text.pdf.PdfReader.readDecryptedDocObj(PdfReader.java:1063)
at com.itextpdf.text.pdf.PdfReader.readDocObj(PdfReader.java:1469)
at com.itextpdf.text.pdf.PdfReader.readPdf(PdfReader.java:751)
at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:198)
at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:236)
at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:224)
at com.itextpdf.text.pdf.PdfReader.<init>(PdfReader.java:214)
at com.company.utils.PdfUtils.getPdfInfo(PdfUtils.java:38)
at com.company.imposition.ImpositionModifyMergePdf2.run(ImpositionModifyMergePdf2.java:57)
at com.company.imposition.ImpositionInstance.work(ImpositionInstance.java:171)
at com.company.imposition.ImpositionInstance.impositionByPath(ImpositionInstance.java:35)
at com.company.Main.main(Main.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.exe4j.runtime.LauncherEngine.launch(Unknown Source)
at com.exe4j.runtime.WinLauncher.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.bouncycastle.asn1.ASN1OctetString
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 19 more
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