classcastexception

A Spark DataFrame contains a column of type Array[Double]. It throw a ClassCastException exception when I try to get it back in a map() function. The following Scala code generate an exception. case class Dummy( x:Array[Double] ) val df = sqlContext.createDataFrame(Seq(Dummy(Array(1,2,3)))) val s = df.map( r => { val arr:Array[Double] = r.getAs[Array[Double]]("x") arr.sum }) s.foreach(println) The exception is java.lang.ClassCastException: scala.collection.mutable.WrappedArray$ofRef cannot be cast to [D at $iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$iwC$$anonfun$1.apply(<console>:24) at $iwC$$iwC$$iwC

I was experiencing occasional exceptions in XPages application: java.lang.ClassCastException: someClass incompatible with someClass. Both mentioned classes are the same, it is class used as session bean. I was not able to google anything covering my problem. Usual explanation for this was change in design elements, not my case. The XPage application become unusable (pages using session bean someClass) since that moment, until restart of http task, or resave of faces-config.xml. In some cases this is related to other exception: com.ibm.jscript.InterpretException: Script interpreter error, line

i'm very confused... I have a class which directly implements an interface: public class Device implements AutocompleteResult {...} Here is proof that I'm looking at the right variables: Object match = ...; log.debug(match.getClass()); // Outputs 'Device' log.debug(match.getClass().getInterfaces()[0]); // Outputs 'AutocompleteResult' Yet when I try to cast an instance of the class to the interface: AutocompleteResult result = (AutocompleteResult) match; I get a ClassCastException! ClassCastException: Device cannot be cast to AutocompleteResult Also, isAssignableFrom returns false and i'm not

I think there must be something subtle going on here that I don't know about. Consider the following: public class Foo<T> { private T[] a = (T[]) new Object[5]; public Foo() { // Add some elements to a } public T[] getA() { return a; } } Suppose that your main method contains the following: Foo<Double> f = new Foo<Double>(); Double[] d = f.getA(); You will get a CastClassException with the message java.lang.Object cannot be cast to java.lang.Double . Can anyone tell me why? My understanding of ClassCastException is that it is thrown when you try to cast an object to a type that cannot be

I'm trying to change a LinearLayout from another class, but when i run this code: public class IRC extends PircBot { ArrayList<String> channels; ArrayList<Integer> userCount; ArrayList<String> topics; LinearLayout channelLayout; Context context; public IRC(Context ctx) { this.setName("xxxx"); channels = new ArrayList<String>(); userCount = new ArrayList<Integer>(); topics = new ArrayList<String>(); context = ctx; channelLayout = (LinearLayout) ((Activity) context).findViewById(R.id.channels); } i get a ClassCastException context is the Main activity that extends Activity passed with a