Example usage for java.lang.reflect Constructor newInstance

Introduction

In this page you can find the example usage for java.lang.reflect Constructor newInstance.

Prototype

@CallerSensitive
@ForceInline 
public T newInstance(Object... initargs) throws InstantiationException, IllegalAccessException,
        IllegalArgumentException, InvocationTargetException

Source Link

Document

Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Usage

From source file:org.bremersee.common.spring.autoconfigure.ObjectMapperAutoConfiguration.java

private static AnnotationIntrospector findAnnotationIntrospectorPair() {
    try {//from www.j  a  va  2 s .  c  o m
        LOG.info("Trying to add a pair of annotation introspectors ('"
                + JacksonAnnotationIntrospector.class.getSimpleName() + " + "
                + JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME + ").");
        @SuppressWarnings("unchecked")
        Class<? extends AnnotationIntrospector> cls = (Class<? extends AnnotationIntrospector>) Class
                .forName(JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME);
        Constructor<? extends AnnotationIntrospector> constructor = cls.getConstructor(TypeFactory.class);
        AnnotationIntrospector secondary = constructor.newInstance(TypeFactory.defaultInstance());

        // see http://wiki.fasterxml.com/JacksonJAXBAnnotations
        AnnotationIntrospector primary = new JacksonAnnotationIntrospector();
        AnnotationIntrospectorPair pair = new AnnotationIntrospectorPair(primary, secondary);
        LOG.info("The pair of annotation introspectors ('" // NOSONAR
                + JacksonAnnotationIntrospector.class.getSimpleName() + " + "
                + JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME + ") was successfully added.");
        return pair;

    } catch (ClassNotFoundException e) { // NOSONAR
        LOG.warn("The pair of annotation introspectors ('" + JacksonAnnotationIntrospector.class.getSimpleName()
                + " " + "+ " + JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME + ") wasn't added: "
                + JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME + " was not found.");
    } catch (NoSuchMethodException | InstantiationException | IllegalAccessException | IllegalArgumentException
            | InvocationTargetException e) {
        LOG.warn("The pair of annotation introspectors ('" + JacksonAnnotationIntrospector.class.getSimpleName()
                + " " + "+ " + JAXB_ANNOTATION_INTROSPECTOR_CLASS_NAME + ") wasn't added.", e);
    }
    return null;

}

From source file:com.oltpbenchmark.util.ClassUtil.java

public static <T> T newInstance(Class<T> target_class, Object params[], Class<?> classes[]) {
    //        Class<?> const_params[] = new Class<?>[params.length];
    //        for (int i = 0; i < params.length; i++) {
    //            const_params[i] = params[i].getClass();
    //            System.err.println("[" + i + "] " + params[i] + " " + params[i].getClass());
    //        } // FOR

    Constructor<T> constructor = ClassUtil.getConstructor(target_class, classes);
    T ret = null;/*from  w ww  . ja  v a  2  s . com*/
    try {
        ret = constructor.newInstance(params);
    } catch (Exception ex) {
        throw new RuntimeException("Failed to create new instance of " + target_class.getSimpleName(), ex);
    }
    return (ret);
}

From source file:ezbake.thrift.ThriftUtils.java

@SuppressWarnings("unchecked")
public static <Y extends TServiceClient> Y getClient(Class<Y> clazz, HostAndPort hostAndPort,
        Properties properties) throws NoSuchMethodException, TException, Exception {
    final Constructor<?> constructor = clazz.getConstructor(TProtocol.class);
    final Object ds = constructor.newInstance(getProtocol(hostAndPort, properties));
    return (Y) ds;
}

From source file:ezbake.thrift.ThriftUtils.java

@SuppressWarnings("unchecked")
public static <Y extends TServiceClient> Y getClient(Class<Y> clazz, HostAndPort hostAndPort, String securityId,
        Properties properties) throws NoSuchMethodException, TException, Exception {
    final Constructor<?> constructor = clazz.getConstructor(TProtocol.class);
    final Object ds = constructor.newInstance(getProtocol(hostAndPort, securityId, properties));
    return (Y) ds;
}

From source file:ezbake.thrift.ThriftUtils.java

@SuppressWarnings("unchecked")
public static <Y extends TServiceClient> Y getClient(Class<Y> clazz, HostAndPort hostAndPort, String securityId,
        Properties properties, TTransportFactory transportFactory)
        throws NoSuchMethodException, TException, Exception {
    final Constructor<?> constructor = clazz.getConstructor(TProtocol.class);
    final Object ds = constructor
            .newInstance(getProtocol(hostAndPort, securityId, properties, transportFactory));
    return (Y) ds;
}

From source file:net.lightbody.bmp.proxy.jetty.util.TypeUtil.java

/** Convert String value to instance.
 * @param type The class of the instance, which may be a primitive TYPE field.
 * @param value The value as a string./*w w w.  j  av a 2  s .  c o m*/
 * @return The value as an Object.
 */
public static Object valueOf(Class type, String value) {
    try {
        if (type.equals(java.lang.String.class))
            return value;

        Method m = (Method) class2Value.get(type);
        if (m != null)
            return m.invoke(null, new Object[] { value });

        if (type.equals(java.lang.Character.TYPE) || type.equals(java.lang.Character.class))
            return new Character(value.charAt(0));

        Constructor c = type.getConstructor(stringArg);
        return c.newInstance(new Object[] { value });
    } catch (NoSuchMethodException e) {
        LogSupport.ignore(log, e);
    } catch (IllegalAccessException e) {
        LogSupport.ignore(log, e);
    } catch (InstantiationException e) {
        LogSupport.ignore(log, e);
    } catch (InvocationTargetException e) {
        if (e.getTargetException() instanceof Error)
            throw (Error) (e.getTargetException());
        LogSupport.ignore(log, e);
    }
    return null;
}

From source file:com.expressui.core.util.ReflectionUtil.java

/**
 * Converts object value to given type. Converts primitives to their wrappers.
 * Converts strings to numbers./*  ww w  .jav  a2s  .  c  o m*/
 *
 * @param value value to convert
 * @param type  type to convert to
 * @param <T>   type
 * @return converted value
 * @throws InvocationTargetException
 * @throws IllegalAccessException
 * @throws InstantiationException
 * @throws NoSuchMethodException
 */
public static <T> T convertValue(Object value, Class<T> type) throws InvocationTargetException,
        IllegalAccessException, InstantiationException, NoSuchMethodException {
    Class clazz;
    if (type.isPrimitive()) {
        clazz = ClassUtils.primitiveToWrapper(type);
    } else {
        clazz = type;
    }

    if (null == value || clazz.isAssignableFrom(value.getClass())) {
        return (T) value;
    }

    Constructor<T> constructor = clazz.getConstructor(new Class[] { String.class });

    return constructor.newInstance(value.toString());
}

From source file:com.alibaba.wasp.client.ServerCallable.java

private static RuntimeException unwrapRuntimeException(Throwable t) {
    if (StringUtils.isNotEmpty(t.getMessage())) {
        try {//from   w  w w . j  a  va 2s  .  com
            Class exceptionClass = Class.forName(t.getMessage());
            Constructor cn = exceptionClass.getConstructor(String.class);
            cn.setAccessible(true);
            String firstLine = t.getMessage();

            Object ex = cn.newInstance(firstLine);
            if (ex instanceof RuntimeException) {
                return (RuntimeException) ex;
            }
        } catch (ClassNotFoundException e) {
            //ignore
        } catch (NoSuchMethodException e) {
            //ignore
        } catch (InvocationTargetException e) {
            //ignore
        } catch (InstantiationException e) {
            //ignore
        } catch (IllegalAccessException e) {
            //ignore
        }
    }
    return null;
}

From source file:com.codelanx.codelanxlib.util.exception.Exceptions.java

/**
 * Dynamically constructs a new instance of a {@link RuntimeException}
 * either via a {@link RuntimeException#RuntimeException(String)}
 * constructor or a no-argument constructor
 *
 * @since 0.1.0//  www  .j  a  v a2  s.  c  o  m
 * @version 0.1.0
 *
 * @param <T> The {@link RuntimeException} type
 * @param ex The exception class to instantiate
 * @param message The message to add, {@code null} if there is no message
 * @return The newly constructed {@link RuntimeException}
 */
private static <T extends RuntimeException> T newException(Class<T> ex, String message) {
    if (message != null) {
        try {
            Constructor<T> c = ex.getConstructor(String.class);
            c.setAccessible(true);
            return c.newInstance(message);
        } catch (NoSuchMethodException e) {
            Debugger.print(Level.WARNING, String.format(
                    "Class '%s' does not have a String " + "message constructor! Using default constructor...",
                    ex.getName()));
        } catch (SecurityException | InstantiationException | IllegalAccessException | IllegalArgumentException
                | InvocationTargetException e) {
            Debugger.error(e, "Error creating new exception instance");
        }
    }
    //Now try here if the previous failed or message wasn't null
    try {
        return ex.newInstance();
    } catch (InstantiationException | IllegalAccessException e) {
        Debugger.error(e, "Error creating new exception instance");
    }
    throw new IllegalArgumentException(String.format(
            "Class '%s' does not have the " + "appropriate constructors to be instantiated", ex.getName()));
}

From source file:at.jku.rdfstats.hist.builder.HistogramBuilderFactory.java

private static HistogramBuilder<?> newInstance(Class<? extends HistogramBuilder<?>> clazz, String typeUri,
        int preferredSize, RDFStatsConfiguration conf) throws HistogramBuilderException {
    if (typeUri == null)
        throw new HistogramBuilderException("Type URI cannot be null.");

    try {//from w  w  w  .j  av  a 2s  .c om
        Constructor<? extends HistogramBuilder<?>> constr = clazz
                .getConstructor(new Class[] { RDFStatsConfiguration.class, String.class, int.class });
        HistogramBuilder<?> builder = constr.newInstance(new Object[] { conf, typeUri, preferredSize });
        return builder;
    } catch (NoSuchMethodException e) {
        throw new HistogramBuilderException("Couldn't create histogram builder (datatype URI: " + typeUri
                + "), implementation '" + clazz.getCanonicalName() + "' is invalid.", e);
    } catch (Exception e) {
        throw new HistogramBuilderException("Couldn't create histogram builder (datatype URI: " + typeUri
                + "), please call HistogramBuilderFactory.supports() first to check if a type is supported.",
                e);
    }
}