Example usage for java.lang ClassNotFoundException ClassNotFoundException

Introduction

In this page you can find the example usage for java.lang ClassNotFoundException ClassNotFoundException.

Prototype

public ClassNotFoundException(String s) 

Source Link

Document

Constructs a ClassNotFoundException with the specified detail message.

Usage

From source file:org.webical.plugin.classloading.PluginClassLoader.java

/**
 * Override of the default method. First tries the parent {@link ClassLoader}
 * (Standard practice) and then our implementation (first the jar registrations and then the class registrations)
 * @see java.lang.ClassLoader#findClass(java.lang.String)
 *///  w ww .j a v a  2s  . co  m
@Override
public Class<?> findClass(String className) throws ClassNotFoundException {
    if (StringUtils.isEmpty(className)) {
        throw new ClassNotFoundException("Cannot load a class without a name: " + className);
    }

    if (definedClassesMap.containsKey(className)) {
        return definedClassesMap.get(className);
    }

    //Try the default ClassLoader (standard practice)
    try {
        if (log.isDebugEnabled()) {
            log.debug("Trying to load class: " + className + " through the default ClassLoader");
        }
        return getParent().loadClass(className);
    } catch (ClassNotFoundException e) {
        if (log.isDebugEnabled()) {
            log.debug("Default ClassLoader could not load class: " + className);
        }
    }

    byte[] classBytes = null;

    //First try the loaded jar files
    if (log.isDebugEnabled()) {
        log.debug("Trying to load class: " + className + " from the registered jar files");
    }
    classBytes = (byte[]) classArrays.get(className);
    if (classBytes != null) {
        if (log.isDebugEnabled())
            log.debug("Class found in jar file");
        Class clazz = defineClass(className, classBytes, 0, classBytes.length, null);
        if (clazz != null) {
            definedClassesMap.put(className, clazz);
        }
        return clazz;
    }

    //Not found, use our implementation
    //Locate and read in the class file
    File classFile = classNameToFileMap.get(className);
    if (classFile == null) {
        log.error("Class does not seem to be registered: " + className);
        throw new ClassNotFoundException("Class does not seem to be registered: " + className);
    }
    if (!classFile.canRead()) {
        log.error("Class does not seem to be readable: " + className + " file: " + classFile.getAbsolutePath());
        throw new ClassNotFoundException(
                "Class does not seem to be readable: " + className + " file: " + classFile.getAbsolutePath());
    }

    FileInputStream classInputStream = null;
    try {
        classInputStream = new FileInputStream(classFile);
        classBytes = getBytesFromFile(classInputStream, classFile.length());
    } catch (FileNotFoundException e) {
        log.error("Class: " + className + " could not be found at registered location: "
                + classFile.getAbsolutePath());
        throw new ClassNotFoundException("Class: " + className + " could not be found at registered location: "
                + classFile.getAbsolutePath());
    } catch (IOException e) {
        log.error("Class: " + className + " could not be read from file " + classFile.getAbsolutePath(), e);
        throw new ClassNotFoundException(
                "Class: " + className + " could not be read from file " + classFile.getAbsolutePath(), e);
    } finally {
        if (classInputStream != null) {
            try {
                classInputStream.close();
            } catch (IOException e) {
                log.error("Could not close FileInputStream for file: " + classFile.getAbsolutePath());
            }
        }
    }

    if (log.isDebugEnabled()) {
        log.debug("Successfully loaded in the bytes for class: " + className);
    }

    //Define and return the class
    try {
        Class clazz = defineClass(className.substring(className.lastIndexOf("/") + 1), classBytes, 0,
                classBytes.length);
        if (clazz != null) {
            definedClassesMap.put(className, clazz);
        }
        return clazz;
    } catch (ClassFormatError e) {
        log.error("Error parsing class file: " + classFile.getAbsolutePath(), e);
        throw new ClassNotFoundException("Error parsing class file: " + classFile.getAbsolutePath(), e);
    }
}

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From source file:com.hurence.logisland.classloading.PluginLoader.java

/**
 * Load a plugin by autoproxying between current caller classloader and plugin own classloader.
 *
 * @param className the name of plugin class to load
 * @param <U>       the return type.
 * @return an instance of the requested plugin
 * @throws ClassNotFoundException//from   w  ww  .  j  a va 2  s .co  m
 * @throws InstantiationException
 * @throws IllegalAccessException
 */
public static <U> U loadPlugin(String className)
        throws ClassNotFoundException, InstantiationException, IllegalAccessException {
    ClassLoader cl = registry.get(className);
    if (cl == null) {
        throw new ClassNotFoundException(
                "Unable to find component with class " + className + ". Please check your classpath");
    }
    ClassLoader thiz = Thread.currentThread().getContextClassLoader();
    Object o;
    try {
        Class<?> cls = cl.loadClass(className);
        Thread.currentThread().setContextClassLoader(cl);
        o = cls.newInstance();
    } finally {
        Thread.currentThread().setContextClassLoader(thiz);
    }
    return (U) PluginProxy.create(o);
}

---

From source file:org.apache.tomcat.util.net.SSLImplementation.java

public static SSLImplementation getInstance(String className) throws ClassNotFoundException {
    if (className == null)
        return getInstance();

    try {//from  w  w  w. j a  v  a  2 s .c om
        // Workaround for the J2SE 1.4.x classloading problem (under Solaris).
        // Class.forName(..) fails without creating class using new.
        // This is an ugly workaround. 
        if (JSSEImplementationClass.equals(className)) {
            return new org.apache.tomcat.util.net.jsse.JSSEImplementation();
        }
        Class clazz = Class.forName(className);
        return (SSLImplementation) clazz.newInstance();
    } catch (Exception e) {
        if (logger.isDebugEnabled())
            logger.debug("Error loading SSL Implementation " + className, e);
        throw new ClassNotFoundException("Error loading SSL Implementation " + className + " :" + e.toString());
    }
}

---

From source file:org.eclipse.ecr.runtime.osgi.OSGiRuntimeActivator.java

public Class<?> loadClass(String bundleName, String className) throws Exception {
    Bundle bundle = getBundle(bundleName);
    if (bundle == null) {
        throw new ClassNotFoundException(
                "No bundle found with name: " + bundleName + ". Unable to load class " + className);
    }//from  w ww.  j  a va  2 s  .c  o  m
    return bundle.loadClass(className);
}

---

From source file:ch.frankel.vaadin.spring.SpringApplicationServlet.java

/**
 * Get the application class from the bean configured in Spring's context.
 * //from   w ww.ja va2 s  .com
 * @see AbstractApplicationServlet#getApplicationClass()
 */
@SuppressWarnings({ "unchecked", "rawtypes" })
@Override
protected Class<? extends Application> getApplicationClass() throws ClassNotFoundException {

    WebApplicationContext wac = WebApplicationContextUtils.getWebApplicationContext(getServletContext());

    if (wac == null) {

        throw new ClassNotFoundException("Cannot get an handle on Spring's context. Is Spring running? "
                + "Check there's an org.springframework.web.context.ContextLoaderListener configured.");
    }

    Object bean = wac.getBean(name);

    if (bean == null) {

        throw new ClassNotFoundException("No application bean found under name " + name);
    }

    return (Class) bean.getClass();
}

---

From source file:com.vaadin.terminal.gwt.server.SpringApplicationOSGiServlet.java

@Override
protected Class<? extends Application> getApplicationClass() throws ClassNotFoundException {
    ApplicationContext springContext = getApplicationContext();

    if (!springContext.containsBean(beanParam)) {

        throw new ClassNotFoundException("No application bean found under name " + beanParam);
    }//from ww  w .j av a  2s.  co m

    return (Class<? extends Application>) springContext.getBean(beanParam).getClass();
}

---

From source file:com.ottogroup.bi.asap.repository.CachedComponentClassLoader.java

/**
 * Loads referenced class:/*from   w w w. j  a  v  a2s . c  om*/
 * <ul>
 *   <li>find in already loaded classes</li>
 *   <li>look it up in previously loaded and thus cached classes</li>
 *   <li>find it in jar files</li>
 *   <li>ask parent class loader</li>
 * </ul>
 * @see java.lang.ClassLoader#loadClass(java.lang.String, boolean)
 */
public Class<?> loadClass(String name) throws ClassNotFoundException {

    synchronized (getClassLoadingLock(name)) {

        // check if class has already been loaded
        Class<?> clazz = findLoadedClass(name);
        if (clazz != null)
            return clazz;

        // check internal cache for already loaded classes
        clazz = cachedClasses.get(name);
        if (clazz != null) {
            return clazz;
        }

        // check if the managed jars contain the class
        if (byteCode.containsKey(name))
            clazz = findClass(name);
        if (clazz != null) {
            return clazz;
        }

        // otherwise hand over the request to the parent class loader
        clazz = super.loadClass(name);
        if (clazz == null)
            throw new ClassNotFoundException("Class '" + name + "' not found");

        return clazz;
    }
}

---

From source file:com.zotoh.maedr.etc.CmdDevice.java

private void cfgDev(String dev) throws Exception {
    JSONObject top = loadConf(getCwd());
    if (!existsDevice(top, dev)) {
        throw new Exception("Unknown device type: " + dev);
    }/*from w w w .j  a v  a 2  s.c  o m*/
    Class<?> z;
    if (DefaultDeviceFactory.getAllDefaultTypes().contains(dev)) {
        z = DefaultDeviceFactory.getDevCZ(dev);
    } else {
        z = getUserDevCZ(top, dev);
    }

    if (z == null) {
        throw new ClassNotFoundException("Class not found for device: " + dev);
    }

    Device d = (Device) z.getConstructor(DeviceManager.class).newInstance(_dummyDevMgr);
    Properties props = new Properties();
    boolean ok = false;

    if (d != null && d.supportsConfigMenu()) {
        ok = d.showConfigMenu(rcb(), props);
    }

    if (!ok) {
        return;
    }

    String id = nsb(props.remove("_id"));
    tstEStrArg("device id", id);
    props.put("type", dev);
    JSONObject obj = new JSONObject(props);
    JSONObject g = getDevs(top);

    if (g.has(id)) {
        throw new Exception("Another device with name \"" + id + "\" is defined already");
    } else {
        g.put(id, obj);
    }

    saveConf(getCwd(), top);
}

---

From source file:org.springframework.data.keyvalue.riak.util.RiakClassLoader.java

@Override
protected Class<?> findClass(String s) throws ClassNotFoundException {
    Class<?> c;//from w  w w  .  j  av a  2 s  .  c  o m
    try {
        c = super.findClass(s);
        if (log.isDebugEnabled()) {
            log.debug(String.format("Found class '%s' locally defined.", s));
        }
    } catch (Throwable t) {
        // Class not defined in this ClassLoader yet
    }

    Set<String> buckets = new LinkedHashSet<String>(this.buckets);
    if (null != defaultBucket) {
        buckets.add(defaultBucket);
    }
    for (String bucket : buckets) {
        if (bucket.indexOf("/") < 0) {
            try {
                if (log.isDebugEnabled()) {
                    log.debug(String.format("Class '%s' not locally defined, trying Riak.", s));
                }
                byte[] buff = riakTemplate.getAsBytes(URLEncoder.encode(bucket, "UTF-8"), s);
                c = defineClass(s, buff, 0, buff.length);
                if (null != c) {
                    return c;
                }
            } catch (ClassFormatError ignored) {
            } catch (UnsupportedEncodingException e) {
                log.error(e.getMessage(), e);
            }
        }
    }

    // Nothing found
    throw new ClassNotFoundException("Class not found: " + s);
}

---

From source file:org.ms123.common.libhelper.FileSystemClassLoader.java

public synchronized Class<?> loadClass(String className, boolean resolve) throws ClassNotFoundException {
    //System.out.println("\tloadClass:"+className);
    Class<?> toReturn = null;
    if (!isValid) {
        //System.out.println("loadClass:isValid:"+this);
        return toReturn;
    }// w w  w.  j a  v  a  2 s .  co m
    if (toReturn == null) {
        toReturn = getAlreadyLoadedClass(className);
    }
    if (loadCustomClassFirst) {
        if (toReturn == null) {
            toReturn = loadCustomClass(className);
        }
        if (toReturn == null) {
            toReturn = loadParentClass(className);
        }
    } else {
        if (toReturn == null) {
            toReturn = loadParentClass(className);
        }
        if (toReturn == null) {
            toReturn = loadCustomClass(className);
        }
    }
    if (toReturn == null) {
        debug("Class not found: " + className);
        throw new ClassNotFoundException(className);
    } else {
        if (resolve) {
            resolveClass(toReturn);
        }
    }
    return toReturn;
}

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