NullPointerException while generating

[MuhamedFathy]

null java.lang.NullPointerException
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.getFieldsForJson(JsonDtoGenerator.java:192)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.generateDto(JsonDtoGenerator.java:141)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.addClass(JsonDtoGenerator.java:128)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.generateClassForObject(JsonDtoGenerator.java:277)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.generateDto(JsonDtoGenerator.java:152)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.addClass(JsonDtoGenerator.java:128)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.generateClassForObject(JsonDtoGenerator.java:277)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.generateDto(JsonDtoGenerator.java:152)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.addFieldsToTheClassUnderCaret(JsonDtoGenerator.java:93)
at com.nvinayshetty.DTOnator.FeedParser.JsonDtoGenerator.run(JsonDtoGenerator.java:89)
at com.intellij.openapi.command.WriteCommandAction$Simple.run(WriteCommandAction.java:234)
at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:171)
at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1003)
at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:170)
at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:210)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:149)
at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:119)
at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:212)
at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:168)
at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:151)
at com.nvinayshetty.DTOnator.ActionListener.UserActionListener.onGenerateButtonClick(UserActionListener.java:166)
at com.nvinayshetty.DTOnator.Ui.TabbedInputWindow.onGenerateClickWithValidFeed(TabbedInputWindow.java:146)
at com.nvinayshetty.DTOnator.Ui.JsonInputEditorPane$3.actionPerformed(JsonInputEditorPane.java:113)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6541)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6306)
at java.awt.Container.processEvent(Container.java:2237)
at java.awt.Component.dispatchEventImpl(Component.java:4897)
at java.awt.Container.dispatchEventImpl(Container.java:2295)
at java.awt.Component.dispatchEvent(Component.java:4719)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
at java.awt.Container.dispatchEventImpl(Container.java:2281)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4719)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:737)
at java.awt.EventQueue$4.run(EventQueue.java:735)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:822)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:646)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[fabiojb]

@MuhamedFathy could you post the Json you used to simulate the problem?