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Re: [gef-dev] ClassNotFoundException when using XMLEncoder to save model under doSaveAs method
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Hey thanks for the reply. it solved the problem, but i bump into another. The XMLEncoder only coded 3 lines of XML codes. Which i find shouldn't be as all the information required to bring back the data is not stored, hence might be impossible to persist data. Any suggestion?
Agape,
Joshua
--- Áõ½¨·å <liu-jf@xxxxxxxxxxx> wrote:
> You can add the following expression:
>
> Thread.currentThread().setContextClassLoader(getClass().getClassLoader());
> before using the nofouned class
>
>
>
> ----- Original Message -----
> From: <agape85@xxxxxxxxxxxxxx>
> To: <gef-dev@xxxxxxxxxxx>
> Sent: Friday, March 04, 2005 9:45 AM
> Subject: [gef-dev] ClassNotFoundException when using XMLEncoder to
> save model under doSaveAs method
>
>
> > Hi all,
> >
> > I have been trying to use XMLEncoder to save my model/diagram
> view. But no matter what i did i kept hitting ClassNotFound
> Exception. Below is the codes written for doSaveAs method.
> >
> > -----------------------------------------------------------
> > public void doSaveAs() {
> > try {
> > System.out.println("Got here with object "+diagram);
> > XMLHandler handleXML = new XMLHandler();
> > handleXML.WriteToXML("Testing.xml",diagram);
> > } catch(Throwable th) {
> > th.printStackTrace();
> > }
> > System.out.println("Exiting here with object "+diagram);
> > }
> > -----------------------------------------------------------
> >
> > And below is the codes written for WriteToXML
> > -----------------------------------------------------------
> > public boolean WriteToXML(String fileName, Object object)
> > {
> > boolean result = false;
> > try
> > {
> > System.out.println("Step 1");
> > XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(new
> FileOutputStream(fileName)));
> > System.out.println("Step 2");
> > encoder.writeObject(object);
> > System.out.println("Step 3");
> > encoder.close();
> > System.out.println("Step 4");
> > result = true;
> > }
> > catch (FileNotFoundException e)
> > {
> > e.printStackTrace();
> > }
> > return result;
> > }
> > -----------------------------------------------------------
> >
> > And below is the error message that i encountered.
> > -----------------------------------------------------------
> > Got here with object
> com.bonevich.simplegef.model.view.DiagramView@1c1c92b
> > Step 1
> > Step 2
> > java.lang.ClassNotFoundException:
> com.bonevich.simplegef.model.view.DiagramView
> > Continuing ...
> > java.lang.Exception: XMLEncoder: discarding statement
> XMLEncoder.writeObject(DiagramView);
> > Continuing ...
> > Step 3
> > Step 4
> > Exiting here with object
> com.bonevich.simplegef.model.view.DiagramView@1c1c92b
> > -----------------------------------------------------------
> >
> > Hopes that someone might be able to tell me if i am doing this
> wrong or is there something that i am missing which leads to the
> error.
> >
> > Attached is .java of XMLHandler and SimpleGefEditor.
> >
> > By the way i am editing on someone else's code which can be found
> here http://eclipsewiki.editme.com/GefExamplesForEclipse3
> >
> > Agape,
> > Joshua
>
>
> --------------------------------------------------------------------------------
>
>
> >
> > /*
> > * Created on Feb 18, 2005
> > *
> > * TODO To change the template for this generated file go to
> > * Window - Preferences - Java - Code Style - Code Templates
> > */
> > package com.bonevich.simplegef;
> > import java.beans.*;
> > import java.io.*;
> >
> >
> > public class XMLHandler {
> >
> > public boolean WriteToXML(String fileName, Object object)
> > {
> > boolean result = false;
> > try
> > {
> > System.out.println("Step 1");
> > XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(new
> FileOutputStream(fileName)));
> > System.out.println("Step 2");
> > encoder.writeObject(object);
> > System.out.println("Step 3");
> > encoder.close();
> > System.out.println("Step 4");
> > result = true;
> > }
> > catch (FileNotFoundException e)
> > {
> > e.printStackTrace();
> > }
> > return result;
> > }
> >
> > public Object ReadFromXML(String fileName)
> > {
> > Object decoded = null;
> > try
> > {
> > XMLDecoder decoder = new XMLDecoder(new BufferedInputStream(new
> FileInputStream(fileName)));
> > decoded = decoder.readObject();
> > decoder.close();
> > }
> > catch (FileNotFoundException e)
> > {
> > e.printStackTrace();
> > }
> > return decoded;
> > }
> > }
>
>
> --------------------------------------------------------------------------------
>
>
> >
> > /*
> > * Created on Jun 20, 2004
> > */
> > package com.bonevich.simplegef.editors;
> >
> > import java.beans.XMLEncoder;
> > import java.io.BufferedOutputStream;
> > import java.io.ByteArrayInputStream;
> > import java.io.ByteArrayOutputStream;
> > import java.io.FileNotFoundException;
> > import java.io.FileOutputStream;
> >
> > import org.eclipse.core.resources.IFile;
> > import org.eclipse.core.resources.IWorkspace;
> > import org.eclipse.core.resources.ResourcesPlugin;
> > import org.eclipse.core.runtime.CoreException;
> > import org.eclipse.core.runtime.IPath;
> > import org.eclipse.core.runtime.IProgressMonitor;
> > import org.eclipse.draw2d.FigureCanvas;
> > import org.eclipse.gef.ContextMenuProvider;
> > import org.eclipse.gef.DefaultEditDomain;
> > import org.eclipse.gef.EditPart;
> > import org.eclipse.gef.EditPartViewer;
> > import org.eclipse.gef.GraphicalViewer;
> > import org.eclipse.gef.KeyHandler;
> > import org.eclipse.gef.KeyStroke;
> > import org.eclipse.gef.Tool;
> > import org.eclipse.gef.editparts.ScalableFreeformRootEditPart;
> > import org.eclipse.gef.palette.ConnectionCreationToolEntry;
> > import org.eclipse.gef.palette.CreationToolEntry;
> > import org.eclipse.gef.palette.MarqueeToolEntry;
> > import org.eclipse.gef.palette.PaletteEntry;
> > import org.eclipse.gef.palette.PaletteGroup;
> > import org.eclipse.gef.palette.PaletteRoot;
> > import org.eclipse.gef.palette.PanningSelectionToolEntry;
> > import org.eclipse.gef.palette.ToolEntry;
> > import org.eclipse.gef.requests.SimpleFactory;
> > import org.eclipse.gef.tools.ConnectionCreationTool;
> > import org.eclipse.gef.ui.actions.ActionRegistry;
> > import org.eclipse.gef.ui.actions.DirectEditAction;
> > import org.eclipse.gef.ui.actions.GEFActionConstants;
> > import org.eclipse.gef.ui.parts.GraphicalEditorWithPalette;
> > import org.eclipse.gef.ui.parts.GraphicalViewerKeyHandler;
> > import org.eclipse.jface.action.IAction;
> > import org.eclipse.jface.dialogs.ProgressMonitorDialog;
> > import org.eclipse.swt.SWT;
> > import org.eclipse.ui.IEditorInput;
> > import org.eclipse.ui.IFileEditorInput;
> > import org.eclipse.ui.IWorkbenchPart;
> > import org.eclipse.ui.actions.ActionFactory;
> > import org.eclipse.ui.actions.WorkspaceModifyOperation;
> > import org.eclipse.ui.dialogs.SaveAsDialog;
> > import org.eclipse.ui.part.FileEditorInput;
> >
> > import com.bonevich.simplegef.SimpleGefPlugin;
> > import com.bonevich.simplegef.XMLHandler;
> > import com.bonevich.simplegef.actions.PropertiesAction;
> > import com.bonevich.simplegef.model.impl.DiagramImpl;
> > import com.bonevich.simplegef.model.view.ConnectionView;
> > import com.bonevich.simplegef.model.view.DiagramView;
> > import com.bonevich.simplegef.model.view.PartView;
> > import com.bonevich.simplegef.parts.SimpleGefEditPartFactory;
> >
> > /**
> > * @author jbonevic
> > * @version $Id: SimpleGefEditor.java,v 1.6 2004/09/30 22:51:45
> jbonevic Exp $
> > */
> > public class SimpleGefEditor extends GraphicalEditorWithPalette {
> > DiagramView diagram;
> > private KeyHandler sharedKeyHandler;
> >
> > public SimpleGefEditor() {
> > super();
> > setEditDomain(new DefaultEditDomain(this));
> > }
> >
> > /**
> > * @see
> org.eclipse.gef.ui.parts.GraphicalEditorWithPalette#getPaletteRoot()
> > */
> > protected PaletteRoot getPaletteRoot() {
> > PaletteRoot root = new PaletteRoot();
> > PaletteGroup group = new PaletteGroup("Tools");
> > root.add(group);
> >
> > ToolEntry tool = new PanningSelectionToolEntry();
> > group.add(tool);
> > root.setDefaultEntry(tool);
> >
> > tool = new MarqueeToolEntry();
> > group.add(tool);
> >
> > PaletteEntry entry = new CreationToolEntry(
> > "Part",
> > "Add a new part to the diagram",
> > new SimpleFactory(PartView.class),
> >
> SimpleGefPlugin.getDefault().getImageDescriptor("icons/part.gif"),
> > SimpleGefPlugin.getDefault().getImageDescriptor("icons/part.gif")
> > );
> > group.add(entry);
> >
> > entry = new ConnectionCreationToolEntry(
> > "Connection",
> > "Add a new connection between parts",
> > new SimpleFactory(ConnectionView.class),
> >
> SimpleGefPlugin.getDefault().getImageDescriptor("icons/connection.gif"),
> >
> SimpleGefPlugin.getDefault().getImageDescriptor("icons/connection.gif")
> > )
> > {
> > /**
> > * @see
> org.eclipse.gef.palette.ConnectionCreationToolEntry#createTool()
> > */
> > public Tool createTool() {
> > ConnectionCreationTool connectionTool = (ConnectionCreationTool)
> super.createTool();
> > connectionTool.setUnloadWhenFinished(true);
> > return connectionTool;
> > }
> > };
> > group.add(entry);
> >
> > return root;
> > }
> >
> > /**
> > * @see
> org.eclipse.gef.ui.parts.GraphicalEditor#initializeGraphicalViewer()
> > */
> > protected void initializeGraphicalViewer() {
> > EditPartViewer viewer = getGraphicalViewer();
> > diagram = new DiagramView();
> > viewer.setContents(diagram);
> > }
> >
> > /**
> > * @see
> org.eclipse.gef.ui.parts.GraphicalEditor#configureGraphicalViewer()
> > */
> > protected void configureGraphicalViewer() {
> > super.configureGraphicalViewer();
> > GraphicalViewer viewer = getGraphicalViewer();
> >
> > ScalableFreeformRootEditPart rootPart = new
> ScalableFreeformRootEditPart();
> > viewer.setRootEditPart(rootPart);
> > viewer.setEditPartFactory(new SimpleGefEditPartFactory());
> >
> > ((FigureCanvas)
> viewer.getControl()).setScrollBarVisibility(FigureCanvas.ALWAYS);
> >
> > getGraphicalViewer().setKeyHandler(
> > new
> GraphicalViewerKeyHandler(viewer).setParent(getCommonKeyHandler())
> > );
> > ContextMenuProvider provider =
> > new SimpleGefContextMenuProvider(viewer, getActionRegistry());
> > viewer.setContextMenu(provider);
> > getSite().registerContextMenu(
> > "com.bonevich.simplegef.editors.contextmenu", //$NON-NLS-1$
> > provider,
> > viewer
> > );
> > }
> >
> > /**
> > * @see org.eclipse.gef.ui.parts.GraphicalEditor#createActions()
> > */
> > protected void createActions() {
> > super.createActions();
> > ActionRegistry registry = getActionRegistry();
> > IAction action = new DirectEditAction((IWorkbenchPart) this);
> > registry.registerAction(action);
> > getSelectionActions().add(action.getId());
> >
> > action = new PropertiesAction(this);
> > registry.registerAction(action);
> > getSelectionActions().add(action.getId());
> > }
> >
> > /**
> > * @return
> > */
> > protected KeyHandler getCommonKeyHandler() {
> > if (sharedKeyHandler == null) {
> > sharedKeyHandler = new KeyHandler();
> > sharedKeyHandler.put(
> > KeyStroke.getPressed(SWT.DEL, 127, 0),
> > getActionRegistry().getAction(ActionFactory.DELETE)
> > );
> > sharedKeyHandler.put(
> > KeyStroke.getPressed(SWT.F2, 0),
> > getActionRegistry().getAction(GEFActionConstants.DIRECT_EDIT)
> > );
> > }
> > return sharedKeyHandler;
> > }
> >
> > /**
> > * @see
> org.eclipse.ui.ISaveablePart#doSave(org.eclipse.core.runtime.IProgressMonitor)
> > */
> > public void doSave(IProgressMonitor monitor) {
> >
> > }
> > /**
> > * @see org.eclipse.ui.ISaveablePart#doSaveAs()
> > */
> > public void doSaveAs() {
> > try {
> > System.out.println("Got here with object "+diagram);
> > XMLHandler handleXML = new XMLHandler();
> > handleXML.WriteToXML("Testing.xml",diagram);
> > } catch(Throwable th) {
> > th.printStackTrace();
> > }
> > System.out.println("Exiting here with object "+diagram);
> > }
> >
> > /**
> > * @see org.eclipse.ui.ISaveablePart#isDirty()
> > */
> > public boolean isDirty() {
> > return getCommandStack().isDirty();
> > }
> >
> > /**
> > * @see org.eclipse.ui.ISaveablePart#isSaveAsAllowed()
> > */
> > public boolean isSaveAsAllowed() {
> > return true;
> > }
> >
> > /*
> > protected void setInput(IEditorInput input)
> > {
> > System.out.println("hmm....");
> > }
> > */
> > }
> >
> _______________________________________________
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