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Graphviz - installation of first project [message #1707575]

Mon, 07 September 2015 13:24

ela szmyd

Messages: 1
Registered: September 2015

Junior Member

I wrote this java code to display a simple graph using Graphviz and GEF4 framework. What's important, I am using Window Builder in Eclipse too. I created SWT/JFace Java project, then converted it into Plug-in project.

I added in BuildPaths libraries, then added dependencies in manifest.

import org.eclipse.gef4.dot.*;
import org.eclipse.gef4.graph.Graph;
import org.eclipse.gef4.layout.algorithms.SpringLayoutAlgorithm;
import org.eclipse.gef4.zest.fx.ZestProperties;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class Abc {
	
	public static void main(String[] args) {
		Display display = Display.getDefault();
		Shell shell = new Shell();
		shell.setSize(450, 300);
		shell.setText("SWT Application");
		
		Graph.Builder graph2 = new Graph.Builder().attr(ZestProperties.GRAPH_LAYOUT, new SpringLayoutAlgorithm());
		new DotImport("digraph{1->2}").into(graph2);
		new DotImport("node[label=zested]; 2->3; 2->4").into(graph2);
		new DotImport("edge[style=dashed]; 3->5; 4->6").into(graph2);
		//SpringLayoutAlgorithm SLA= new SpringLayoutAlgorithm(); 
		graph2.build();

		shell.open();
		shell.layout();
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch()) {
				display.sleep();
			}
		}
	}

}

Errors:

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/emf/ecore/EStructuralFeature
	at org.eclipse.gef4.dot.DotImport.load(DotImport.java:81)
	at org.eclipse.gef4.dot.DotImport.loadFrom(DotImport.java:63)
	at org.eclipse.gef4.dot.DotImport.init(DotImport.java:55)
	at org.eclipse.gef4.dot.DotImport.<init>(DotImport.java:46)
	at Abc.main(Abc.java:17)
Caused by: java.lang.ClassNotFoundException: org.eclipse.emf.ecore.EStructuralFeature
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 5 more

Have you got any idea, what could I miss? Thank you for any help!

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Re: Graphviz - installation of first project [message #1707669 is a reply to message #1707575]

Tue, 08 September 2015 12:50

Zoltan Ujhelyi

Messages: 392
Registered: July 2015

Senior Member

Hi,

the DOT feature of GEF4 has multiple external dependencies, including Xtext and EMF. Are they all added to your build path? More specifically, the code you have found seems to require EMF.

Cheers,
Zoltán

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