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---
title: Installing Add-ons in Eclipse with Ivy
order: 3
layout: page
---
[[addons.eclipse]]
= Installing Add-ons in Eclipse with Ivy
The Vaadin Plugin for Eclipse uses Apache Ivy to resolve dependencies. The
dependencies should be listed in the [filename]#ivy.xml# file in the project
root. The Vaadin Directory allows dowloading add-ons from a Maven repository,
which can be accessed also by Ivy.
You can also use Ivy to resolve dependencies in an Ant script.
. Open the add-on page in Vaadin Directory.
. Select the version. The latest is shown by default, but you can choose another
the version from the dropdown menu in the header of the add-on details page.
. Click the [guilabel]#Maven/Ivy# to display the Ivy dependency declaration, as
illustrated in Figure <<figure.addons.eclipse.ivybutton>>. If the add-on is
available with multiple licenses, you will be prompted to select a license for
the dependency.
+
[[figure.addons.eclipse.ivybutton]]
.Ivy Dependency Declaration
image::img/directory-ivy-dependency.png[]
. Open the [filename]#ivysettings.xml# in your Eclipse project either in the XML
or Ivy Editor (either double-click the file or right-click it and select "Open
With > Ivy Editor").
+
Check that the settings file has the [literal]#++<ibiblio>++# entry given in the
Directory page. It should be, if the file was created by the Vaadin project
wizard in Eclipse. If not, copy it there.
+
----
<chain name="default">
...
<ibiblio name="vaadin-addons"
usepoms="true"
m2compatible="true"
root="http://maven.vaadin.com/vaadin-addons"/>
...
</chain>
----
+
If you get Vaadin addons from another repository, such as the local repository
if you have compiled them yourself, you need to define a resolver for the
repository in the settings file.
. Open the [filename]#ivy.xml# in your Eclipse project and copy the Ivy dependency
to inside the [literal]#++dependencies++# element. It should be as follows:
+
[subs="normal"]
----
<dependencies>
...
<dependency org="**com.vaadin.addon**"
name="**vaadin-charts**"
rev="**1.0.0**"/>
</dependencies>
----
+
You can specify either a fixed version number or a dynamic revision tag, such as
[literal]#++latest.release++#. You can find more information about the
link:http://ant.apache.org/ivy/history/2.1.0/ivyfile/dependency.html[dependency
declarations] in Ivy documentation.
+
If the [filename]#ivy.xml# does not have a [literal]#++<configurations
defaultconfmapping="default->default">++# defined, you also need to have
[literal]#++conf="default->default"++# in the dependency to resolve transient
dependencies correctly.
+
IvyIDE immediately resolves the dependencies when you save the file.
. Compile the add-on widget set
////
, as described in <xref
linkend="addons.compiling.eclipse"/>.
////
by clicking the [guilabel]#Compile Vaadin widgets# button in the toolbar.
+
[[figure.addons.eclipse.toolbar]]
.Compiling Widget Set in Eclipse
image::img/widgetset-compiling-toolbar-hi.png[]
If you experience problems with Ivy, first check all the dependency parameters.
IvyDE can sometimes cause unexpected problems. You can clear the Ivy dependency
cache by right-clicking the project and selecting "Ivy > Clean all caches". To
refresh Ivy configuration, select "Ivy > Refresh". To try resolving again Ivy,
select "Ivy > Resolve".
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