Java Class Loader getProjectClassLoader(IJavaProject javaProject, ClassLoader parentClassLoader)

Description

Creates a ClassLoader using the project's build path.

License

Open Source License

Parameter

Parameter	Description
javaProject	the Java project.
parentClassLoader	the parent class loader, may be null.

Exception

Parameter	Description
Exception	if something goes wrong.

Return

a new ClassLoader based on the project's build path.

Declaration

public static ClassLoader getProjectClassLoader(IJavaProject javaProject, ClassLoader parentClassLoader)
        throws Exception 

Method Source Code

//package com.java2s;
/******************************************************************************
 * Copyright (c) 2015 Red Hat, Inc. and others. 
 * All rights reserved. This program and the accompanying materials are 
 * made available under the terms of the Eclipse Public License v1.0 which 
 * accompanies this distribution, and is available at 
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: JBoss by Red Hat - Initial implementation.
 *****************************************************************************/

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.resources.IProject;

import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.runtime.IPath;

import org.eclipse.jdt.core.IClasspathEntry;

import org.eclipse.jdt.core.IJavaProject;

import org.eclipse.jdt.core.JavaCore;

public class Main {
    /**//from  w  ww. j ava2 s .  c  o m
     * Creates a ClassLoader using the project's build path.
     *
     * @param javaProject the Java project.
     * @param parentClassLoader the parent class loader, may be null.
     *
     * @return a new ClassLoader based on the project's build path.
     *
     * @throws Exception if something goes wrong.
     */
    public static ClassLoader getProjectClassLoader(IJavaProject javaProject, ClassLoader parentClassLoader)
            throws Exception {
        IProject project = javaProject.getProject();
        IWorkspaceRoot root = project.getWorkspace().getRoot();
        List<URL> urls = new ArrayList<>();
        urls.add(
                new File(project.getLocation() + "/" + javaProject.getOutputLocation().removeFirstSegments(1) + "/") //$NON-NLS-2$
                        .toURI().toURL());
        for (IClasspathEntry classpathEntry : javaProject.getResolvedClasspath(true)) {
            if (classpathEntry.getEntryKind() == IClasspathEntry.CPE_PROJECT) {
                IPath projectPath = classpathEntry.getPath();
                IProject otherProject = root.getProject(projectPath.segment(0));
                IJavaProject otherJavaProject = JavaCore.create(otherProject);
                urls.add(new File(otherProject.getLocation() + "/" //$NON-NLS-1$
                        + otherJavaProject.getOutputLocation().removeFirstSegments(1) + "/").toURI().toURL()); //$NON-NLS-1$
            } else if (classpathEntry.getEntryKind() == IClasspathEntry.CPE_LIBRARY) {
                urls.add(new File(classpathEntry.getPath().toOSString()).toURI().toURL());
            }
        }
        if (parentClassLoader == null) {
            return new URLClassLoader(urls.toArray(new URL[urls.size()]));
        }
        return new URLClassLoader(urls.toArray(new URL[urls.size()]), parentClassLoader);
    }
}

Related

1. getLoadingDir(Class clazz)
2. getManifest(ClassLoader cl, String extension)
3. getPackageFolder(String packageName, ClassLoader classLoader)
4. getParentClassLoader()
5. getProjectClassLoader(IJavaProject javaProject)
6. getStreamForPath(ClassLoader loader, String path)
7. getToolsClassLoader()
8. isBizServicesLocatorXmlLoaded(File f, ClassLoader classLoader)
9. load(Class serviceClass, ClassLoader loader)