Steps to reproduce:

- Create a Class diagram
- Put a Class element to the diagram and name it 'MyClass'
- Go to the source of the class
- Add 'java.util.List' import into the source
  -------------------------------------------------------------
  import java.util.List;

  public class MyClass {
    public MyClass() {
    }
  }
  -------------------------------------------------------------
- Add 'List list' attribute into the source

  -------------------------------------------------------------
  import java.util.List;

  public class MyClass {
    List list;
    
    public MyClass() {
    }
  }
  -------------------------------------------------------------

  Set/get methods are generated with 'ArrayList' type instead of 'List' type

  -------------------------------------------------------------
  import java.util.List;

  public class MyClass {
    List list;
    
    public MyClass() {
    }

    public ArrayList getList() {
        return list;
    }

    public void setList(ArrayList val) {
        this.list = val;
    }
  }
  -------------------------------------------------------------
  The java project is not compiled:

Compiling 1 source file to JavaApplication\build\classes
JavaApplication\src\MyClass.java:10: cannot find symbol
symbol  : class ArrayList
location: class MyClass
    public ArrayList getList() {
JavaApplication\src\MyClass.java:14: cannot find symbol
symbol  : class ArrayList
location: class MyClass
    public void setList(ArrayList val) {
2 errors
BUILD FAILED (total time: 1 second)