java.lang.NullPointerException: null

Stack Overflow | zero_cool | 6 months ago
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    Hashtable getting null for existing key

    Stack Overflow | 6 months ago | zero_cool
    java.lang.NullPointerException: null
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    Play Store Error Report

    GitHub | 2 years ago | rastating
    java.lang.RuntimeException: An error occured while executing doInBackground()
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Root Cause Analysis

  1. java.lang.NullPointerException

    null

    at java.util.Collections.sort()
  2. Java RT
    Collections.sort
    1. java.util.Collections.sort(Collections.java:175)[na:1.8.0_60]
    1 frame
  3. Vaadin
    ContainerHierarchicalWrapper.setParent
    1. com.vaadin.data.util.ContainerHierarchicalWrapper.updateHierarchicalWrapper(ContainerHierarchicalWrapper.java:191)[vaadin-server-7.6.8.jar:7.6.8]
    2. com.vaadin.data.util.ContainerHierarchicalWrapper$PiggybackListener.containerItemSetChange(ContainerHierarchicalWrapper.java:838)[vaadin-server-7.6.8.jar:7.6.8]
    3. com.vaadin.data.util.AbstractContainer.fireItemSetChange(AbstractContainer.java:242)[vaadin-server-7.6.8.jar:7.6.8]
    4. com.vaadin.data.util.AbstractContainer.fireItemSetChange(AbstractContainer.java:228)[vaadin-server-7.6.8.jar:7.6.8]
    5. com.vaadin.data.util.ContainerHierarchicalWrapper.fireItemSetChangeIfAbstractContainer(ContainerHierarchicalWrapper.java:506)[vaadin-server-7.6.8.jar:7.6.8]
    6. com.vaadin.data.util.ContainerHierarchicalWrapper.setParent(ContainerHierarchicalWrapper.java:495)[vaadin-server-7.6.8.jar:7.6.8]
    6 frames
  4. com.xinra.listaide
    EstablishRelationWindow.lambda$3
    1. com.xinra.listaide.frontend.EstablishRelationWindow.lambda$3(EstablishRelationWindow.java:104)[classes/:na]
    1 frame
  5. Java RT
    Iterable.forEach
    1. java.lang.Iterable.forEach(Iterable.java:75)[na:1.8.0_60]
    1 frame
  6. com.xinra.listaide
    EstablishRelationWindow.buildChildrenTree
    1. com.xinra.listaide.frontend.EstablishRelationWindow.buildChildrenTree(EstablishRelationWindow.java:102)[classes/:na]
    1 frame