Create Eclipse bundle and use it in RCP app

Provided that we already prepared RCP app for multiproject build, we can now create Eclipse bundle and use it in RCP app.

1. Create folder "tutorials/MyBundle", create file "build.gradle" in it, insert code:

apply plugin: 'java'
apply plugin: 'eclipse-bundle'

2. Create folder "tutorials/MyBundle/src/main/java/mybundle", create file "HelloWorld.java" in it, insert code:

package mybundle;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.swt.widgets.Shell;

public class HelloWorld {

  public static void showMessageDialog(Shell shell) {
    MessageDialog.openQuestion(shell, "Information", "Hello, world!");
  }
}

3. Edit file "tutorials/settings.gradle", insert code:

include 'MyBundle'

so that there are two includes - "MyRcpApp" and "MyBundle".

4. Edit file "tutorials/MyRcpApp/build.gradle", insert code:

dependencies {
  compile project(':MyBundle')
}

5. Edit file "tutorials/MyRcpApp/src/main/java/myrcpapp/View.java", replace content with:

package myrcpapp;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.ui.part.ViewPart;

public class View extends ViewPart {

  @Override
  public void createPartControl(final Composite parent) {
    parent.setLayout(new RowLayout());
    Button btnShowDialog = new Button(parent, SWT.PUSH);
    btnShowDialog.setText("Show dialog");
    btnShowDialog.addSelectionListener(new SelectionAdapter() {
      @Override
      public void widgetSelected(SelectionEvent event) {
        mybundle.HelloWorld.showMessageDialog(parent.getShell());
      }
    });
  }

  @Override
  public void setFocus() {
  }
}

6. Invoke on command line in "tutorials" folder:

gradle build

CHECK: folder "tutorials/MyBundle/build/libs" contains file "MyBundle-1.0.0.0.jar", which is proper OSGi bundle with automatically generated manifest.

CHECK: Each product in "tutorials/MyRcpApp/build/output" contains "MyBundle" and "MyRcpApp" bundles in "plugins" subfolder and in "configuration/config.ini".

CHECK: The product matching your OS/architecture is runnable. Upon run, it shows window with title "Hello, RCP" and with button "Show dialog". When you click the button, the program shows modal dialog with text "Hello, world!".

The example code corresponding to this page is located in tutorialExamples/RcpApp-4.

Now we can move on to add splash to RCP app.