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编译错误后的Java类PdfFormFiller

我在编译这个 java 项目时遇到问题https://github.com/nkitsul/pdfformfiller2

mkdir PdfFormFiller
cd PdfFormFiller/
git clone https://github.com/nkitsul/pdfformfiller2.git .
cd lib/
wget https://github.com/itext/itextpdf/releases/download/5.5.0/itext-5.5.0.zip
unzip itext-5.5.0.zip 
cd ..
mkdir bin
javac -cp lib/itextpdf-5.5.0.jar PdfFormFiller.java -d bin/
java -cp ./bin PdfFormFiller.PdfFormFiller

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之后我得到这个：

Exception in thread "main" java.lang.NoClassDefFoundError: com/itextpdf/text/DocumentException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2531)
    at java.lang.Class.getMethod0(Class.java:2774)
    at java.lang.Class.getMethod(Class.java:1663)
    at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494)
    at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)
Caused by: java.lang.ClassNotFoundException: com.itextpdf.text.DocumentException
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 6 more

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我究竟做错了什么？