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java.lang.NullPointerException: 	at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.calculateFontSize(PDAppearance.java:558)	at org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.setAppearanceValue(PDAppearance.java:303)	at org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.setValue(PDVariableText.java:131)	at org.apache.jsp.index_jsp._jspService(index_jsp.java:91)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:111)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)