Plugin Error java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument not found

We are creating a plugin over pdf. In Java, our code is working as expected but as soon as we put the jar file in Appian, we are getting the error

Caused by: java.lang.ClassNotFoundException: org.apache.pdfbox.pdmodel.PDDocument not found by com.obwwx.pdf [80]

We are certain that we are adding the library,

Can you please guide us over the root cause and possible fix?

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