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Caused by java lang nullpointerexception collection null

) needs to be a String and the getDistance( ) method probably returns null. To prevent the exception you can do something like this: if ( lhs! Since you did not say as yet what to point to Java sets it to null, meaning " I am pointing at nothing". In the second line, the new. Finally, How to pinpoint the exception & cause using Stack Trace · share. of the null object. Reference: http : / / docs. com/ javase/ 8/ docs/ api/ java/ lang/ NullPointerException. Avoid returning null in methods, for example returning empty collections when applicable. You need to initialize a List to not get the NullPointerException. protected List< EventSeat> modelData = new ArrayList< EventSeat> ( ) ;. NullPointerException is thrown when program attempts to use an object reference that has the null value. A Java program to demonstrate that invoking a method. / / on null causes NullPointerException. NullPointerException is thrown when an application is trying to use a reference equal to null.

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  • Video:Java nullpointerexception null

    Caused null lang

    A very good technique is to create methods that return an empty collection, instead of a null value. I don' t understand why you are adding null values to the dataList in readFile method. isEmpty( ) ) { dataList. add( line) ; } } catch ( IOException IOE) { / / IO Exception Handling } catch ( Exception e) { / / General Exception Handling }. list is null as you haven' t initialized it. public RT_ Adapter( Context context, String[ ] title, String[ ] descs, int[ ] icons) { list = new ArrayList< Creator> ( ) ; this. c = context; for ( int i = 0; i < title. length; i+ + ) { list. add( new Creator( title[ i], descs[ i], icons[ i] ) ) ; } }. NullPointerException when accessing lazy loaded collection within DAO method · java multithreading spring. The problem is that the session. get( ) call creates PersistentBag objects for all lazy loaded collections but never sets the content. This only occurs. This will create a returned object null instead of an empty collection in case no collection records are found. NullPointerException is thrown when an application attempts to use an object reference that has the null value.

    list is not complete — there are no rules for preventing NullPointerException entirely in Java, because the standard libraries have to be used, and they can cause NullPointerException s. That' s 10 more than we want, so use collections instead, or explicitly fill the array at initialization with:. The list is not null but the size cannot be determined. The problem was that the collection was read from the DB with ' lazy' on. Hence it was not totally read and so The. size( ) call throws a ' NullPointerException'.