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Editorial Team
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Asked: 2026-06-14T18:12:43+00:00

I would like to return java.util.List val cacheManager = mock(classOf[CacheManager]) val cache = mock(classOf[Cache])

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I would like to return java.util.List 

  val cacheManager = mock(classOf[CacheManager])
  val cache = mock(classOf[Cache])

  when(cacheManager.getCache(anyString)).thenReturn(cache)
  when(cache.getKeys.asInstanceOf[List[String]]).thenReturn(List("some_key"))

It compiles, but throws:

  java.lang.NullPointerException
  at net.sf.ehcache.Cache.checkStatus(Cache.java:2722)
  at net.sf.ehcache.Cache.getKeys(Cache.java:1912)
  at (last line of code)

How can I fix it? I tried a couple of ways, but without a success.

Method signature:

     public final java.util.List getKeys() throws java.lang.IllegalStateException, net.sf.ehcache.CacheException { /* compiled code */ }
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1 Answer

  1. Editorial Team

    PowerMock, an extension to Mockito and other, however can mock final methods. http://code.google.com/p/powermock/wiki/MockFinal

    Also when referring to java.util.List you probably want to use the full name and not just List, which normally is scala.collection.immutable.List.

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