I have installed the JAD plugin for eclipse. I just downloaded the jar and put it in eclipse plugin folder and then downloaded the executable files from here.

After extracting the zip file, I see now jad.exe and double clicked it. I am not sure if any thing wrong in the installation step, but in eclipse I see jadeclispe in eclipse editor.

When I open a class file, I see the following error

java.io.IOException: Cannot run program "jad" (in directory "C:\Users\sgudla
.net.sf.jadclipse\1341954004841"): CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(Unknown Source)
    at java.lang.Runtime.exec(Unknown Source)
    at net.sf.jadclipse.JadDecompiler.decompile(JadDecompiler.java:160)
    at net.sf.jadclipse.JadDecompiler.decompileFromArchive(JadDecompiler.java:217)
    at net.sf.jadclipse.JadclipseSourceMapper.findSource(JadclipseSourceMapper.java:150)
    at net.sf.jadclipse.JadclipseSourceMapper.findSource(JadclipseSourceMapper.java:83)
    at net.sf.jadclipse.JadclipseClassFileEditor.doOpenBuffer(JadclipseClassFileEditor.java:87)
    at net.sf.jadclipse.JadclipseClassFileEditor.doSetInput(JadclipseClassFileEditor.java:45)
    at net.sf.jadclipse.JadclipseActionBarContributor.setActiveEditor(JadclipseActionBarContributor.java:87)
    at org.eclipse.ui.internal.EditorActionBars.partChanged(EditorActionBars.java:343)
    at org.eclipse.ui.internal.WorkbenchPage$3.run(WorkbenchPage.java:635)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.runtime.Platform.run(Platform.java:888)
    at org.eclipse.ui.internal.WorkbenchPage.activatePart(WorkbenchPage.java:624)
    at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3533)
    at org.eclipse.ui.internal.WorkbenchPage.internalActivate(WorkbenchPage.java:617)
    at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:589)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2875)
    at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2768)
    at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2760)
    at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2711)
    at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2707)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2691)
    at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2682)
    at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:378)
    at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:178)
    at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:229)
    at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:208)
    at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:274)
    at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:250)
    at org.eclipse.jdt.internal.ui.navigator.OpenAndExpand.run(OpenAndExpand.java:49)
    at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:221)
    at org.eclipse.ui.navigator.CommonNavigatorManager$3.open(CommonNavigatorManager.java:185)
    at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
    at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:845)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49)
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
    at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:843)
    at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1131)
    at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:462)
    at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1235)
    at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
    at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
    at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4066)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3657)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2629)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2593)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2427)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:670)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:663)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:115)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1383)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.(Unknown Source)
    at java.lang.ProcessImpl.start(Unknown Source)
    ... 71 more

Can some one tell what is missing here to make it work?

How to install JAD for use with Eclipse (in Windows)

1. Download the executable (.exe) from here: http://www.softpedia.com/get/Programming/Debuggers-Decompilers-Dissasemblers/JAD.shtml

   Save the file (the README too, it has good instructions) somewhere in the file system, for example in C:\Program Files\JadDecompiler\

2. Download the JAD Eclipse plugin (.jar) from http://sourceforge.net/projects/jadclipse/

3. Copy the downloaded jar file to the plugins folder of Eclipse, for example C:\dev\eclipse\plugins

4. Restart Eclipse (for the plugin to take effect)

5. In Eclipse, Click Window –> Preferences –> Java –> Jadclipse and enter for example:

Done.

Now you’ll be able to see any source that is attached but in compressed (jar) format.