当我们得到java.lang.NoSuchMethodError即使在JAR /类有particualar方法 [英] When do we get java.lang.NoSuchMethodError even when the jar/class has the particualar method

问题描述

我使用iText库，以方便在applet PDF导出。在出口称之为失败，以下错误：

  java.lang.NoSuchMethodError：com.lowagie.text.pdf.PdfPTable.completeRow（）V
 

我打开和iText JAR / PdfPtable.class在JD反编译，并确认这个类completeRow作为公共方法。

有人能解释一下可能出现的情况，当 java.lang.NoSuchMethodError 即使JAR /类有它抛出？

下面是堆栈跟踪;可能不是很有益，因为大多数的调用都是我们的专用。

  

出错导出到CSV文件 - java.lang.NoSuchMethodError：com.lowagie.text.pdf.PdfPTable.completeRow（）V结果
     com.blox.table.action.ExportToCSVAction.actionPerformed（ExportToCSVAction.java:193）结果
     javax.swing.AbstractButton.fireActionPerformed（来源不明）结果
     javax.swing.AbstractButton中的$ Handler.actionPerformed（来源不明）结果
     javax.swing.DefaultButtonModel.fireActionPerformed（来源不明）结果
     javax.swing.DefaultButtonModel.set pressed（来源不明）结果
     javax.swing.plaf.basic.BasicButtonListener.mouseReleased（来源不明）结果
     java.awt.Component.processMouseEvent（来源不明）结果
     javax.swing.JComponent.processMouseEvent（来源不明）结果
     java.awt.Component.processEvent（来源不明）结果
     java.awt.Container.processEvent（来源不明）结果
     java.awt.Component.dispatchEventImpl（来源不明）结果
     java.awt.Container.dispatchEventImpl（来源不明）结果
     java.awt.Component.dispatchEvent（来源不明）结果
     java.awt.LightweightDispatcher.retargetMouseEvent（来源不明）结果
     java.awt.LightweightDispatcher.processMouseEvent（来源不明）结果
     java.awt.LightweightDispatcher.dispatchEvent（来源不明）结果
     java.awt.Container.dispatchEventImpl（来源不明）结果
     java.awt.Window.dispatchEventImpl（来源不明）结果
     java.awt.Component.dispatchEvent（来源不明）结果
     java.awt.EventQueue.dispatchEvent（来源不明）结果
     java.awt.EventDispatchThread.pumpOneEventForFilters（来源不明）结果
     java.awt.EventDispatchThread.pumpEventsForFilter（来源不明）结果
     java.awt.EventDispatchThread.pumpEventsForHierarchy（来源不明）结果
     java.awt.EventDispatchThread.pumpEvents（来源不明）结果
     java.awt.EventDispatchThread.pumpEvents（来源不明）结果
     java.awt.EventDispatchThread.run（来源不明）结果
  com.lowagie.text.pdf.PdfPTable.completeRow（）V结果
     com.blox.table.view.GridTableModel $ PdfExportWriter.writeNewLine（GridTableModel.java:7259）结果
     com.blox.table.view.GridTableModel.buildExportData（GridTableModel.java:3111）结果
     com.blox.table.view.GridTableModel.export（GridTableModel.java:2541）结果
     com.blox.table.view.GridTable.export（GridTable.java:1318）结果
     com.blox.table.action.ExportToCSVAction.exportToFile（ExportToCSVAction.java:248）结果
     com.blox.table.action.ExportToCSVAction.access $ 1（ExportToCSVAction.java:245）结果
     com.blox.table.action.ExportToCSVAction $ Worker.exportToCSVFile（ExportToCSVAction.java:111）结果
     sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）结果
     sun.reflect.NativeMethodAccessorImpl.invoke（来源不明）结果
     sun.reflect.DelegatingMethodAccessorImpl.invoke（来源不明）结果
     java.lang.reflect.Method.invoke（来源不明）结果
     spin.Invocation.evaluate（Invocation.java:175）结果
     spin.off.SpinOffEvaluator $ 1.run（SpinOffEvaluator.java:108）结果
     java.lang.Thread.run（来源不明）

解决方案

我发现第三方罐子一人被捆绑iText库的旧版本

I am using IText library to facilitate pdf export in an applet. During the export call it fails with following error:

java.lang.NoSuchMethodError: com.lowagie.text.pdf.PdfPTable.completeRow()V

I opened the Itext jar/PdfPtable.class in JD Decompiler and confirmed that the class has completeRow as a public method.

Can somebody explain the possible scenarios when a java.lang.NoSuchMethodError is thrown even when jar/class has it?

Here is the stack trace; may not be very helpful as most of the calls are our application specific.

Error while exporting to the CSV file - java.lang.NoSuchMethodError: com.lowagie.text.pdf.PdfPTable.completeRow()V
com.blox.table.action.ExportToCSVAction.actionPerformed(ExportToCSVAction.java:193)
javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
javax.swing.DefaultButtonModel.setPressed(Unknown Source)
javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
java.awt.Component.processMouseEvent(Unknown Source)
javax.swing.JComponent.processMouseEvent(Unknown Source)
java.awt.Component.processEvent(Unknown Source)
java.awt.Container.processEvent(Unknown Source)
java.awt.Component.dispatchEventImpl(Unknown Source)
java.awt.Container.dispatchEventImpl(Unknown Source)
java.awt.Component.dispatchEvent(Unknown Source)
java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
java.awt.Container.dispatchEventImpl(Unknown Source)
java.awt.Window.dispatchEventImpl(Unknown Source)
java.awt.Component.dispatchEvent(Unknown Source)
java.awt.EventQueue.dispatchEvent(Unknown Source)
java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.pumpEvents(Unknown Source)
java.awt.EventDispatchThread.run(Unknown Source)
com.lowagie.text.pdf.PdfPTable.completeRow()V
com.blox.table.view.GridTableModel$PdfExportWriter.writeNewLine(GridTableModel.java:7259)
com.blox.table.view.GridTableModel.buildExportData(GridTableModel.java:3111)
com.blox.table.view.GridTableModel.export(GridTableModel.java:2541)
com.blox.table.view.GridTable.export(GridTable.java:1318)
com.blox.table.action.ExportToCSVAction.exportToFile(ExportToCSVAction.java:248)
com.blox.table.action.ExportToCSVAction.access$1(ExportToCSVAction.java:245)
com.blox.table.action.ExportToCSVAction$Worker.exportToCSVFile(ExportToCSVAction.java:111)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
spin.Invocation.evaluate(Invocation.java:175)
spin.off.SpinOffEvaluator$1.run(SpinOffEvaluator.java:108)
java.lang.Thread.run(Unknown Source)

解决方案

I found out that one of the third party jar was bundling a older version of iText library

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