Example usage for java.net URLClassLoader URLClassLoader

Introduction

In this page you can find the example usage for java.net URLClassLoader URLClassLoader.

Prototype

public URLClassLoader(String name, URL[] urls, ClassLoader parent) 

Source Link

Document

Constructs a new named URLClassLoader for the specified URLs.

Usage

From source file:de.micromata.tpsb.doc.renderer.RendererClassUtils.java

public static ClassLoader createClassLoaderFromPath(List<String> pathes) {
    List<URL> urls = new ArrayList<URL>();

    try {//from   www .  ja  v a  2s.  co  m
        for (String path : pathes) {
            File f = new File(path);
            if (f.exists() == false) {
                log.error("tpsbrendercp class path doesn't exist: " + path + " in " + f.getAbsolutePath());
                continue;
            }
            URL url = new File(path).toURI().toURL();
            urls.add(url);
        }
        URLClassLoader cl = new URLClassLoader(urls.toArray(new URL[] {}),
                RendererClassUtils.class.getClassLoader(), null) {
            @Override
            public Class<?> loadClass(String name) throws ClassNotFoundException {
                try {
                    return super.loadClass(name);
                } catch (ClassNotFoundException ex) {
                    throw ex;
                }
            }
        };
        return cl;
    } catch (RuntimeException ex) {
        throw ex;
    } catch (Exception ex) {
        throw new RuntimeException(ex);
    }
}

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From source file:gov.anl.cue.arcane.engine.matrix.MatrixModel.java

/**
 * Run the matrix model.//from w  w  w .j  a va2  s  . co m
 *
 * @return the double
 */
public Double runMatrixModel() {

    // Create a results holder.
    Double results = Double.NaN;

    // Attempt to run the model.
    try {

        // Setup a temporary class loader.
        URL[] urls = new URL[] { new File(Util.TEMP_DIR).toURI().toURL() };
        URLClassLoader classLoader = new URLClassLoader(urls, null, null);

        // Attempt to load the compiled file.
        @SuppressWarnings("rawtypes")
        Constructor constructor = classLoader
                .loadClass(MatrixModel.PACKAGE_NAME + "." + MatrixModel.CONCRETE_CLASS_NAME)
                .getDeclaredConstructor(double.class);
        constructor.setAccessible(true);
        Object object = constructor.newInstance(this.stepSize);

        // Call "matrixFormulation.step(steps)".
        Method method = object.getClass().getSuperclass().getMethod("step", int.class);
        method.invoke(object, this.stepCount);

        // Call matrixFormulation.calculateFitnessValue();
        method = object.getClass().getSuperclass().getMethod("calculateFitnessValue");
        results = (Double) method.invoke(object);

        // Clear the given class loader, which should not be
        // a child of another class loader.
        object = null;
        method = null;
        classLoader.close();
        ResourceBundle.clearCache(classLoader);
        classLoader = null;
        Introspector.flushCaches();
        System.runFinalization();
        System.gc();

        // Catch exceptions.
    } catch (Exception e) {

        // Return the default result.
        results = Double.NaN;

    }

    // Return the results.
    return results;

}

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