[aroo]

Hello all,
i am writing an eclipse plugin and have this problem:

i want to load dynamicly a java-file from a existing/open project and create an object from it.

NietzscheClassLoader classLoader = new NietzscheClassLoader(JavaCore.create(Global.getProject()));
			Class class1 = classLoader.findClass("pac.TestFrame");
			try {
				Frame f = (Frame) class1.newInstance();
...

i use the flowing ClassLoader to do this:

package plugin.nietzsche.tools;

import org.eclipse.jdt.core.IClassFile;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.IPackageFragment;
import org.eclipse.jdt.core.IType;
import org.eclipse.jdt.core.JavaModelException;

public class NietzscheClassLoader extends ClassLoader {
	private IJavaProject javaProject;

	public NietzscheClassLoader(IJavaProject project) {
		super();
		if (project == null || !project.exists() || !project.isOpen())
			throw new IllegalArgumentException("Invalid javaProject");
		this.javaProject = project;
	}

	public NietzscheClassLoader(IJavaProject project, ClassLoader classLoader) {
		super(classLoader);
		if (project == null || !project.exists() || !project.isOpen())
			throw new IllegalArgumentException("Invalid javaProject");
		this.javaProject = project;
	}

	@SuppressWarnings("unchecked")
	public Class findClass(String className) {
		IClassFile classFile = null;
		try {
			IType type = javaProject.findType(className);
			final IPackageFragment fragment = type.getPackageFragment();
			String java = className.substring(className.lastIndexOf('.') + 1) + ".class";
			classFile = fragment.getClassFile(java);
			final byte[] buff = classFile.getBytes();
			if (buff != null)
			return defineClass(className, buff, 0, buff.length);
		} catch (JavaModelException e) {
			System.err.println("");
			e.printStackTrace();
		}
		return null;
	}
}

now my problem:
fragment.getClassFile(java); return an *.java path and not the *.class file:

Caused by: org.eclipse.core.internal.resources.ResourceExcept ion: Resource '/test/src/pac/TestFrame.class' does not exist.
at org.eclipse.core.internal.resources.Resource.check Exists(Resource.java:310)
at org.eclipse.core.internal.resources.Resource.check Accessible(Resource.java:193)
at org.eclipse.core.internal.resources.File.getConten ts(File.java:285)
at org.eclipse.jdt.internal.core.util.Util.getResourc eContentsAsByteArray(Util.java:1005)
at org.eclipse.jdt.internal.core.ClassFile.getBytes(C lassFile.java:329)
at plugin.nietzsche.NietzscheClassLoader.findClass(Ni etzscheClassLoader.java:36)
at plugin.nietzsche.editor.NietzscheEditor.createPart Control(NietzscheEditor.java:122)
at org.eclipse.ui.internal.EditorReference.createPart Helper(EditorReference.java:661)
at org.eclipse.ui.internal.EditorReference.createPart (EditorReference.java:426)
at org.eclipse.ui.internal.WorkbenchPartReference.get Part(WorkbenchPartReference.java:592)
at org.eclipse.ui.internal.EditorReference.getEditor( EditorReference.java:263)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEdit orBatched(WorkbenchPage.java:2739)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEdit or(WorkbenchPage.java:2651)
at org.eclipse.ui.internal.WorkbenchPage.access$13(Wo rkbenchPage.java:2643)
at org.eclipse.ui.internal.WorkbenchPage$10.run(Workb enchPage.java:2595)
at org.eclipse.swt.custom.BusyIndicator.showWhile(Bus yIndicator.java:67)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(W orkbenchPage.java:2590)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(W orkbenchPage.java:2574)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(W orkbenchPage.java:2557)
at com.placeworkers.plugin.nietzsche.views.NietzscheV iew$8.run(NietzscheView.java:306)
at org.eclipse.jface.action.Action.runWithEvent(Actio n.java:498)
at org.eclipse.jface.action.ActionContributionItem.ha ndleWidgetSelection(ActionContributionItem.java:54 6)
at org.eclipse.jface.action.ActionContributionItem.ac cess$2(ActionContributionItem.java:490)
at org.eclipse.jface.action.ActionContributionItem$6. handleEvent(ActionContributionItem.java:443)
at org.eclipse.swt.widgets.EventTable.sendEvent(Event Table.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.ja va:938)
at org.eclipse.swt.widgets.Display.runDeferredEvents( Display.java:3682)
at org.eclipse.swt.widgets.Display.readAndDispatch(Di splay.java:3293)
at org.eclipse.ui.internal.Workbench.runEventLoop(Wor kbench.java:2389)
at org.eclipse.ui.internal.Workbench.runUI(Workbench. java:2353)
at org.eclipse.ui.internal.Workbench.access$4(Workben ch.java:2219)
at org.eclipse.ui.internal.Workbench$4.run(Workbench. java:466)
at org.eclipse.core.databinding.observable.Realm.runW ithDefault(Realm.java:289)
at org.eclipse.ui.internal.Workbench.createAndRunWork bench(Workbench.java:461)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Pl atformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplica tion.start(IDEApplication.java:106)
at org.eclipse.equinox.internal.app.EclipseAppHandle. run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.runApplication(EclipseAppLauncher.java: 106)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework( Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.ja va:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:11 73)
at org.eclipse.equinox.launcher.Main.main(Main.java:1 148)


in this project i use the default output folder "project/bin".
Eclipse SDK Version: 3.3.2

thank you.
aroo

PS: sorry for my bad english

[oxygold]

The exception is caused by the TestFrame.class which is closed to generate the IClassFile, if you observe the classFile variable in your NietzscheClassLoader, you will get this TestFrame.class (not open) [in pac [in src [in test]]]
The Class maybe not in used and the class files are all output to a given folder (which could get from the IJavaProject)

If you just want to get the Object of TestFrame.class, here is one way:

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;

import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.launching.JavaRuntime;

public class NietzscheClassLoader extends ClassLoader {
private IJavaProject javaProject;
private static final String PROTOCAL_PREFIX = "file:///";

public NietzscheClassLoader(IJavaProject project) {
super();
if (project == null || !project.exists() || !project.isOpen())
throw new IllegalArgumentException("Invalid javaProject");
this.javaProject = project;
}

public Class findClass(String className) {
try {
String[] classPaths = JavaRuntime.computeDefaultRuntimeClassPath(javaPro ject);
URL[] urls = new URL[classPaths.length];
for (int i = 0; i < classPaths.length; i++)
urls[i] = new URL(PROTOCAL_PREFIX + computeForURLClassLoader(classPaths[i]));
ClassLoader loader = new URLClassLoader(urls);
Class classObject = loader.loadClass(className);
return classObject;

} catch (Exception e) {
e.printStackTrace();
}
return null;
}

private static String computeForURLClassLoader(String classpath) {
if (!classpath.endsWith("/")) {
File file = new File(classpath);
if (file.exists() && file.isDirectory())
classpath = classpath.concat("/");
}
return classpath;
}
}

BTW, I wonder your Class Global's structure,