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java.lang.NullPointerException at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.calculateFontSize( at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.setAppearanceValue( at org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.setValue( at org.apache.jsp.index_jsp._jspService( at org.apache.jasper.runtime.HttpJspBase.service( at javax.servlet.http.HttpServlet.service(