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Eclipse Editor Settings

This page describes the noticeable changes made to the default code formatting settings in Eclipse. This is also a chance to review some of these changes and tweak them if necessary. None of these are essential for a pull request, but they all help. They can also be added after the original pull request but before a merge.


  • Line length is 80 characters

  • Use spaces instead of tabs for indentation

  • Use UTF-8 encoding

  • Use unix-style line endings (\n)

Code Conventions

  1. Open Window  Preferences (Windows) or Eclipse  Preferences (Mac)

  2. On the Java  Code Style  Formatter page, import your local copy of VaadinJavaConventions.xml

  3. On the Java  Code Style  Organize Imports page, import your local copy of flow.importorder

  4. On the Editor  Save Actions tab, make sure that in case Format source code is active, the Format edited lines option is selected. Never use the Format all lines option, as that may introduce loads of unnecessary code changes, making code reviews a nightmare.

  5. Go to General  Workspace

    1. Set Text file encoding to UTF-8

    2. Set New text file line delimiter to Unix

  6. Go to XML  XML Files  Editor and ensure the settings are configured as follows:

    • Line width: 72

    • Format comments: true

    • Join lines: true

    • Insert whitespace before closing empty end-tags: true

    • Indent using spaces: true

    • Indentation size: 4

  1. Open Window  Preferences (Windows) or Eclipse  Preferences (Mac)

  2. On the Java  Code Style  Code Templates page, edit the Comments  Files template to add the copyright text:

    Copyright 2000-${currentDate:date('yyyy')} Vaadin Ltd.
    Licensed under the Apache License, Version 2.0 (the "License"); you may not
    use this file except in compliance with the License. You may obtain a copy of
    the License at
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    License for the specific language governing permissions and limitations under
    the License.