我正在使用iText来压缩PDF，直到现在它正常工作。
出于生产目的，我使用log4j来记录我的应用程序的错误和信息。
在关闭日志文件时，我看到来自iText XFAWorker的错误（虽然我的展平程序运行正常）。
我还注意到XFAWorker正在使用slf4j进行内部记录。
任何人都可以帮我解决这个错误，这里我附上整个日志。
XFA form element: xfa[0].form[0].Form2_Dtls[0]
Event 'initialize'
org.mozilla.javascript.EcmaError: TypeError: Cannot call method "indexOf" of undefined (js#612)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3687)
at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:3665)
at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:3693)
at org.mozilla.javascript.ScriptRuntime.typeError2(ScriptRuntime.java:3712)
at org.mozilla.javascript.ScriptRuntime.undefCallError(ScriptRuntime.java:3731)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThisHelper(ScriptRuntime.java:2258)
at org.mozilla.javascript.ScriptRuntime.getPropFunctionAndThis(ScriptRuntime.java:2251)
at org.mozilla.javascript.Interpreter.interpretLoop(Interpreter.java:1317)
at script.initializeWithoutCheckForm(js:612)
at script.formInintialize(js:8)
at script(js:4)
at org.mozilla.javascript.Interpreter.interpret(Interpreter.java:815)
at org.mozilla.javascript.InterpretedFunction.call(InterpretedFunction.java:109)
at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:394)
at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3091)
at org.mozilla.javascript.InterpretedFunction.exec(InterpretedFunction.java:120)
at org.mozilla.javascript.Context.evaluateString(Context.java:1079)
at com.itextpdf.tool.xml.xtra.xfa.js.RhinoJsObject.evaluateScript(RhinoJsObject.java:98)
at com.itextpdf.tool.xml.xtra.xfa.js.RhinoJsObject.evaluateScript(RhinoJsObject.java:73)
at com.itextpdf.tool.xml.xtra.xfa.js.JsContainer.execOwnEvent(JsContainer.java:50)
at com.itextpdf.tool.xml.xtra.xfa.js.JsContainer.execEvent(JsContainer.java:42)
at com.itextpdf.tool.xml.xtra.xfa.positioner.Positioner.execEvent(Positioner.java:412)
at com.itextpdf.tool.xml.xtra.xfa.XFAFlattener.placeFormDom(XFAFlattener.java:1158)
at com.itextpdf.tool.xml.xtra.xfa.XFAFlattener.flatten(XFAFlattener.java:897)
at com.itextpdf.tool.xml.xtra.xfa.XFAFlattener.flatten(XFAFlattener.java:444)
at com.itextpdf.tool.xml.xtra.xfa.XFAFlattener.flatten(XFAFlattener.java:312)
at com.itextpdf.tool.xml.xtra.xfa.XFAFlattener.flatten(XFAFlattener.java:282)