Example usage for java.beans Beans instantiate

Introduction

In this page you can find the example usage for java.beans Beans instantiate.

Prototype

public static Object instantiate(ClassLoader cls, String beanName) throws IOException, ClassNotFoundException 

Source Link

Document

Instantiate a JavaBean.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    Main bean = (Main) Beans.instantiate(ClassLoader.getSystemClassLoader(), "Main");
    System.out.println("The Bean = " + bean);
}

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From source file:Main.java

public static void main(String[] argv) throws Exception {

    MyBean bean = (MyBean) Beans.instantiate(ClassLoader.getSystemClassLoader(), "MyBean");

}

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From source file:MainClass.java

public MainClass(String name) {
    super("Revived Beans!");
    try {/*www .jav  a 2  s. c o m*/
        Object bean = Beans.instantiate(getClass().getClassLoader(), name);

        if (Beans.isInstanceOf(bean, JComponent.class)) {
            JComponent comp = (JComponent) Beans.getInstanceOf(bean, JComponent.class);
            getContentPane().add("Center", comp);
        } else {
            System.out.println("Bean is not a Component...");
        }
    } catch (java.io.IOException e1) {
        System.out.println("Error loading the serialized object");
    } catch (ClassNotFoundException e2) {
        System.out.println("Can't find the class that goes with the object");
    }
}

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From source file:org.fudgemsg.mapping.JavaBeanBuilder.java

@SuppressWarnings("unchecked")
private T newBeanObject() throws IllegalArgumentException, InstantiationException, IllegalAccessException,
        InvocationTargetException, IOException, ClassNotFoundException {
    if (getConstructor() != null) {
        return getConstructor().newInstance();
    } else {/*from  w w  w.  ja  v  a2 s  .  com*/
        // Warning: the Beans.instantiate method below was about 5 times slower in the perf tests
        return (T) Beans.instantiate(getClass().getClassLoader(), getBeanName());
    }
}

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From source file:org.toryt.util_I.beanfinder.InstantiatingFqcnBeanFinder.java

public final Object findFor(_Argument_ argument) throws BeanFinderConfigurationException, NoBeanFoundException {
    assert argument != null;
    String fqcn = fqcn(argument); // throws NoBeanFoundException
    _LOG.debug("  trying to instantiate class with FQCN " + fqcn + " with default constructor");
    Object bean = null;/*from   w w w  .  ja  v a2  s  . com*/
    try {
        bean = Beans.instantiate(null, fqcn);
        assert bean != null;
        if (!(getBeanType().isInstance(bean))) {
            ClassCastException ccExc = new ClassCastException(
                    bean + " cannot be cast to type " + getBeanType());
            logInstantiationProblem1(argument, fqcn, ccExc);
        }
        _LOG.debug("Created bean for argument " + argument + " from class " + fqcn);
    } catch (IOException ioExc) {
        logInstantiationProblem1(argument, fqcn, ioExc); // throws exception
    } catch (NullPointerException npExc) {
        // undocumented; if fqcn is null
        logInstantiationProblem2(argument, fqcn, npExc); // throws exception
    } catch (ClassNotFoundException cnfExc) {
        logInstantiationProblem2(argument, fqcn, cnfExc);
    }
    /* it is weird that we cannot get other exceptions here, according to the Beans.instantiate
     * Javadoc: how about exceptions in the constructor, having no default constructor, etc.
     * Solution is found in source code of the instantiate method: such exceptions
     * are all recast to ClassCastException.
     */
    assert bean != null;
    return bean;
}

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From source file:org.toryt_II.testobject.DefaultTofPlFactory.java

/**
 * @pre forClass != null;/*from w  ww.j  a  va  2s .  c  o m*/
 * @pre getCachedTofPl(forClass) == null;
 */
private <_ForClass_> TestObjectFactoryPriorityList<_ForClass_> getTofPlFromSystemProperty(
        Class<_ForClass_> forClass) {
    assert forClass != null;
    assert getCachedTofPl(forClass) == null;
    assert forClass == null;
    _LOG.debug("trying to instantiate TOF PL for class " + forClass.getName() + " via FQCN in system property");
    Properties properties = System.getProperties();
    String key = SYSTEM_PROPERTY_KEY_PREFIX + forClass.getName();
    _LOG.debug("  system property key: \"" + key + "\"");
    String tofPlFqcn = properties.getProperty(key);
    _LOG.debug("  value of system property: \"" + tofPlFqcn + "\"");
    _LOG.debug("  trying to instantiate class with FQCN " + tofPlFqcn + " with default constructor");
    try {
        @SuppressWarnings("unchecked")
        TestObjectFactoryPriorityList<_ForClass_> result = (TestObjectFactoryPriorityList<_ForClass_>) Beans
                .instantiate(null, tofPlFqcn);
        // runtime cannot check against generic type instantiation
        _LOG.info("Created TOF PL for class " + forClass + " from class " + tofPlFqcn
                + " (value of system property " + key + ")");
        addCachedTofPl(forClass, result);
        return result;
    } catch (AlreadyHasTofPlForClassException e) {
        assert false : "AlreadyHasTofPlForClassException should not happen: " + e;
    } catch (IOException ioExc) {
        logTofPlFromSystemPropertyInstantiationProblem(forClass, tofPlFqcn, key, ioExc);
    } catch (ClassNotFoundException cnfExc) {
        logTofPlFromSystemPropertyInstantiationProblem(forClass, tofPlFqcn, key, cnfExc);
    } catch (ClassCastException ccExc) {
        logTofPlFromSystemPropertyInstantiationProblem(forClass, tofPlFqcn, key, ccExc);
    }
    return null; // keep compiler happy
}

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From source file:poke.server.managers.ElectionManager.java

private Election createElection() {
    if (election == null) {
        synchronized (syncPt) {
            // new election
            String clazz = ElectionManager.conf.getElectionImplementation();

            // if an election instance already existed, this would
            // override the current election
            try {
                election = (Election) Beans.instantiate(this.getClass().getClassLoader(), clazz);
                election.setNodeId(conf.getNodeId());
                election.setListener(this);

                // this sucks - bad coding here! should use configuration
                // properties
                if (election instanceof FloodMaxElection) {
                    logger.warn("Node " + conf.getNodeId() + " setting max hops to arbitrary value (5)");
                    ((FloodMaxElection) election).setMaxHops(4);
                }// w  w w.j a v  a 2 s.  co m

            } catch (Exception e) {
                logger.error("Failed to create " + clazz, e);
            }
        }
    }

    return election;

}

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