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Solutions on the web20371

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  • via GitHub by todoubaba
    , 1 year ago
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  • Stack trace

    • java.lang.NullPointerException: null at java.util.Collections.sort([na:1.8.0_60] at[vaadin-server-7.6.8.jar:7.6.8] at$PiggybackListener.containerItemSetChange([vaadin-server-7.6.8.jar:7.6.8] at[vaadin-server-7.6.8.jar:7.6.8] at[vaadin-server-7.6.8.jar:7.6.8] at[vaadin-server-7.6.8.jar:7.6.8] at[vaadin-server-7.6.8.jar:7.6.8] at com.xinra.listaide.frontend.EstablishRelationWindow.lambda$3([classes/:na] at java.lang.Iterable.forEach([na:1.8.0_60] at com.xinra.listaide.frontend.EstablishRelationWindow.buildChildrenTree([classes/:na]

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