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    <p>You should look at the API docs for the <code>:+</code> methods you're calling.</p> <p><s>I'm not sure which Scala collection type that <code>java.util.List</code> is being implicitly converted to, but I think the <code>:+</code> method is the same everywhere: <a href="http://www.scala-lang.org/api/current/#scala.collection.Seq" rel="nofollow">http://www.scala-lang.org/api/current/#scala.collection.Seq</a></s></p> <p><code>java.util.List</code> is <a href="http://docs.scala-lang.org/overviews/collections/conversions-between-java-and-scala-collections.html" rel="nofollow">implicitly converted</a> to <a href="http://www.scala-lang.org/api/current/index.html#scala.collection.mutable.Buffer" rel="nofollow"><code>scala.collection.mutable.Buffer</code></a>.</p> <blockquote> <p>A copy of this sequence with an element appended.</p> </blockquote> <p>In other words, <code>:+</code> doesn't modify the collection, so the statement <code>TestResult :+ studentsearch</code> has no effect.</p> <p>You could call the Java collection's method directly: <code>TestResult addAll studentsearch</code>.</p> <p>Although, may I ask, why are you using <code>java.util.List</code> instead of a Scala collection?</p> <p>I should also note, of course, that in Scala just like in Java, starting a variable name with a capital letter is frowned upon heavily. (<code>testResult</code>, not <code>TestResult</code>). It's even more important in Scala because variables and types share the same namespace, unlike in Java.</p>
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    1. POHow to concatenate a list to another list in scala
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    1. USChris Martin
    1. USChris Martin
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      1. VTUpMod
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    1. COwhy i use java.util.list because it's a java -scala interoperable project
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      1. USPrasanth A R
    2. COi change :+ to addAll the error on browser Request processing failed; nested exception is java.lang.UnsupportedOperationException
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      1. USPrasanth A R
    3. COcan you try appendAll
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      1. USVishal John
 

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