old_contents: /**
   * @license
   * Copyright 2020 The FOAM Authors. All Rights Reserved.
   * http://www.apache.org/licenses/LICENSE-2.0
   */
  foam.CLASS({
    package: 'foam.core',
    name: 'ValidationException',
    javaExtends: 'RuntimeException',
    implements: ['foam.core.Exception'],
  
    properties: [
      {
        class: 'Object',
        of: 'foam.core.PropertyInfo',
        name: 'propertyInfo'
      },
      {
        class: 'String',
        name: 'propName'
      },
      {
        class: 'String',
        name: 'errorMessage'
      }
    ],
  
    axioms: [
      {
        name: 'javaExtras',
        buildJavaClass: function(cls) {
          cls.extras.push(foam.java.Code.create({
          data: `
      public ValidationException(String message) {
        super(message);
      }
  
      public ValidationException(String message, Exception cause) {
        super(message, cause);
      }
              `
            }));
          }
        }
      ]
  });
  
new_contents: /**
   * @license
   * Copyright 2020 The FOAM Authors. All Rights Reserved.
   * http://www.apache.org/licenses/LICENSE-2.0
   */
  foam.CLASS({
    package: 'foam.core',
    name: 'ValidationException',
    javaExtends: 'RuntimeException',
    implements: ['foam.core.Exception'],
  
    javaImports:[
      'java.lang.Exception'
    ],
  
    properties: [
      {
        class: 'Object',
        of: 'foam.core.PropertyInfo',
        name: 'propertyInfo'
      },
      {
        class: 'String',
        name: 'propName'
      },
      {
        class: 'String',
        name: 'errorMessage'
      }
    ],
  
    axioms: [
      {
        name: 'javaExtras',
        buildJavaClass: function(cls) {
          cls.extras.push(foam.java.Code.create({
          data: `
      public ValidationException(String message) {
        super(message);
      }
  
      public ValidationException(String message, Exception cause) {
        super(message, cause);
      }
              `
            }));
          }
        }
      ]
  });
  
subject: add missing import