Question

我编写了这个java代码，使用Graphviz和GEF4框架显示一个简单的图形。重要的是，我也在Eclipse中使用Window Builder。我创建了SWT / JFace Java项目，然后将其转换为Plug-in项目。

import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.SWT;
import org.eclipse.gef4.dot.DotImport;
import org.eclipse.gef4.graph.*;
import org.eclipse.gef4.zest.fx.*;
import org.eclipse.gef4.layout.*;
import org.eclipse.gef4.layout.algorithms.*;


public class Code1 {

  public static void main(String[] args) {
    Display display = Display.getDefault();
    Shell shell = new Shell();
    shell.setSize(450, 300);
    shell.setText("SWT Application");
    shell.setLayout(null);


            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();
        }
    }
  }
}

我有错误：

Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/emf/ecore/resource/ResourceSet
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 program2.Code2.main(Code2.java:24)
Caused by: java.lang.ClassNotFoundException:  org.eclipse.emf.ecore.resource.ResourceSet
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

我发现我需要在Build Path中添加构建路径（带有所需库的jar文件）。所以我补充道。我还添加了所有依赖项。但它仍然无效。你有什么想法，我能错过什么？谢谢你的任何想法！

Answer 1

你应该找到org.eclipse.emf.ecore.resource.ResourceSet lib并将文件jar添加到elipse。

Java中的Graphviz，GEF4和构建路径

1 个答案: