I am building a custom arcMap Addin button which onclick event tells info about selected features.

Following is my java class ---

public class Break extends Button {

 * Called when the button is clicked.
 * @exception java.io.IOException if there are interop problems.
 * @exception com.esri.arcgis.interop.AutomationException if the component throws an ArcObjects exception.
public void onClick() throws IOException, AutomationException {
    // TODO Auto-generated method stub

    MapBean mapBean = new MapBean();
        IMap map = mapBean.getMap();
        ISelection selection = map.getFeatureSelection();
        IEnumFeature enumFeature = (IEnumFeature)selection;
        IFeature feature = enumFeature.next();
        while (feature != null){
            System.out.println("FEATURE ID: " + feature.getOID());
            feature = enumFeature.next();
    catch (Exception e){

I implimented the button on ArcMap but nothing seems to work onclick event , might be its not getting the ArcMap at all.Could anybody tell how to resolve this issue.

Thanks in advance////


@Andrew Rohne is correct, you first need to get reference to the application then the mxdoc within your click event method. Here is an example below (in vb.net though):

Public Shared gApp As IApplication
Public Shared gMxDoc As IMxDocument

 Protected Overrides Sub OnClick()
            gApp = CType(Hook, IApplication)
            gMxDoc = CType(My.ArcMap.Application.Document, IMxDocument)

            'your logic here

            My.ArcMap.Application.CurrentTool = Nothing

        Catch ex As Exception
            MessageBox.Show("Caught an unspecified error in the calling code: " & vbCrLf & ex.ToString)
        End Try
 Emd Sub

Do you have:

public void init(IApplication app) throws IOException, AutomationException {
    this.app = app;

In your class?

You would need to have an application object in the class:

public class Break extends Button {
    private IApplication app; //<~ Add this too
    public void onClick() throws IOException, AutomationException {

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