hequn8128 commented on a change in pull request #7370: [FLINK-11161]Unable to 
import java packages in scala-shell
URL: https://github.com/apache/flink/pull/7370#discussion_r244248189
 
 

 ##########
 File path: 
flink-scala-shell/src/test/scala/org/apache/flink/api/scala/ScalaShellITCase.scala
 ##########
 @@ -362,6 +362,83 @@ class ScalaShellITCase extends TestLogger {
     Assert.assertFalse(output.contains("ERROR"))
     Assert.assertFalse(output.contains("Exception"))
   }
+
+  @Test
+  def testImportJavaCollection(): Unit = {
+    val input = """
+      import java.util.List
+      val jul: List[Int] = new java.util.ArrayList[Int]()
+      jul.add(2)
+      jul.add(4)
+      jul.add(6)
+      jul.add(8)
+      jul.add(10)
+      val str = "the java list size is: " + jul.size
+    """.stripMargin
+
+    val output = processInShell(input)
+
+    Assert.assertTrue(output.contains("the java list size is: 5"))
+    Assert.assertFalse(output.contains("failed"))
 
 Review comment:
   Ignore case when comparing for these assertFalse so that more abnormal cases 
can be checked. For example, you can call `toLowerCase`. 

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