java.lang.NullPointerException: This exception has no message.

Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Samebug tips

Do you know how to solve this issue? Write a tip to help other users and build your expert profile.

Solutions on the web

java.lang.NullPointerException:
at org.datacleaner.components.group.GrouperTransformer.getOutputDataStreams(GrouperTransformer.java:167)
at org.datacleaner.job.builder.AbstractComponentBuilder.getOutputDataStreams(AbstractComponentBuilder.java:940)
at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.addNodes(JobGraphNodeBuilder.java:322)
at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraphInternal(JobGraphNodeBuilder.java:106)
at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraphInternal(JobGraphNodeBuilder.java:86)
at org.datacleaner.widgets.visualization.JobGraphNodeBuilder.buildGraph(JobGraphNodeBuilder.java:79)
at org.datacleaner.widgets.visualization.JobGraph.refresh(JobGraph.java:148)
at org.datacleaner.windows.AnalysisJobBuilderWindowImpl$WindowTransformerChangeListener.onConfigurationChanged(AnalysisJobBuilderWindowImpl.java:207)
at org.datacleaner.windows.AnalysisJobBuilderWindowImpl$WindowTransformerChangeListener.onConfigurationChanged(AnalysisJobBuilderWindowImpl.java:179)
at org.datacleaner.job.builder.TransformerComponentBuilder.onConfigurationChanged(TransformerComponentBuilder.java:295)
at org.datacleaner.job.builder.AbstractComponentBuilder.setConfiguredProperty(AbstractComponentBuilder.java:331)
at org.datacleaner.widgets.properties.MinimalPropertyWidget.fireValueChanged(MinimalPropertyWidget.java:144)
at org.datacleaner.widgets.properties.MinimalPropertyWidget.fireValueChanged(MinimalPropertyWidget.java:73)
at org.datacleaner.widgets.properties.MultipleInputColumnsPropertyWidget$1.onItemSelected(MultipleInputColumnsPropertyWidget.java:89)
at org.datacleaner.widgets.properties.MultipleInputColumnsPropertyWidget$1.onItemSelected(MultipleInputColumnsPropertyWidget.java:83)
at org.datacleaner.widgets.DCCheckBox.notifyListeners(DCCheckBox.java:151)
at org.datacleaner.widgets.DCCheckBox.notifyListeners(DCCheckBox.java:145)
at org.datacleaner.widgets.DCCheckBox.itemStateChanged(DCCheckBox.java:80)
at javax.swing.AbstractButton.fireItemStateChanged(AbstractButton.java:2050)
at javax.swing.AbstractButton$Handler.itemStateChanged(AbstractButton.java:2355)
at javax.swing.DefaultButtonModel.fireItemStateChanged(DefaultButtonModel.java:455)
at javax.swing.JToggleButton$ToggleButtonModel.setSelected(JToggleButton.java:272)
at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:289)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
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)

Users with the same issue

You are the first who have seen this exception. Write a tip to help other users and build your expert profile.

Write tip

Know the solutions? Share your knowledge to help other developers to debug faster.