Example usage for java.lang NullPointerException NullPointerException

Introduction

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

Prototype

public NullPointerException(String s)

Source Link

Document

Constructs a NullPointerException with the specified detail message.

Usage

From source file:Main.java

/**
 * Converts a class name to a JLS style class name.
 *
 * @param className  the class name/* ww  w .  j ava2 s .  c  o m*/
 * @return the converted name
 */
private static String toCanonicalName(String className) {
    className = deleteWhitespace(className);
    if (className == null) {
        throw new NullPointerException("className must not be null.");
    } else if (className.endsWith("[]")) {
        StringBuilder classNameBuffer = new StringBuilder();
        while (className.endsWith("[]")) {
            className = className.substring(0, className.length() - 2);
            classNameBuffer.append("[");
        }
        String abbreviation = abbreviationMap.get(className);
        if (abbreviation != null) {
            classNameBuffer.append(abbreviation);
        } else {
            classNameBuffer.append("L").append(className).append(";");
        }
        className = classNameBuffer.toString();
    }
    return className;
}

From source file:br.bireme.mlts.utils.Document2JSON.java

public static String getString(final Document doc) {
    if (doc == null) {
        throw new NullPointerException("doc");
    }// w ww . j av  a2s.c  o m
    return getJSON(getMap(doc)).toJSONString();
}

From source file:Main.java

/**
 * Get a list of all threads in a thread group.  An empty
 * array is returned if there are no threads in the group.
 *
 * @param   group   the thread group to list
 * @return      an array of threads//from w w  w .  jav a2 s . c om
 * @throws   NullPointerException
 *          if the group is null
 */
public static Thread[] getGroupThreads(final ThreadGroup group) {
    if (group == null)
        throw new NullPointerException("Null group");
    int nAlloc = group.activeCount();
    int n = 0;
    Thread[] threads = null;
    do {
        nAlloc *= 2;
        threads = new Thread[nAlloc];
        n = group.enumerate(threads, false);
    } while (n == nAlloc);
    return threads.clone();
}

From source file:Main.java

/**
 * Get a list of all threads in a thread group.  An empty
 * array is returned if there are no threads in the group.
 *
 * @param   group   the thread group to list
 * @return      an array of threads/*from   ww  w  .  ja  v a  2  s  . c  om*/
 * @throws   NullPointerException
 *          if the group is null
 */
public static Thread[] getGroupThreads(final ThreadGroup group) {
    if (group == null)
        throw new NullPointerException("Null group");
    int nAlloc = group.activeCount();
    int n = 0;
    Thread[] threads = null;
    do {
        nAlloc *= 2;
        threads = new Thread[nAlloc];
        n = group.enumerate(threads, false);
    } while (n == nAlloc);
    return java.util.Arrays.copyOf(threads, n);
}

From source file:Main.java

/**
 * Reads exactly 'byteCount' bytes from 'in' (into 'dst' at offset 'offset'), and throws
 * EOFException if insufficient bytes are available.
 *
 * Used to implement {@link java.io.DataInputStream#readFully(byte[], int, int)}.
 *///  w  w w .ja  v  a2  s .c  o m
public static void readFully(InputStream in, byte[] dst, int offset, int byteCount) throws IOException {
    if (byteCount == 0) {
        return;
    }
    if (in == null) {
        throw new NullPointerException("in == null");
    }
    if (dst == null) {
        throw new NullPointerException("dst == null");
    }
    checkOffsetAndCount(dst.length, offset, byteCount);
    while (byteCount > 0) {
        int bytesRead = in.read(dst, offset, byteCount);
        if (bytesRead < 0) {
            throw new EOFException();
        }
        offset += bytesRead;
        byteCount -= bytesRead;
    }
}

From source file:edu.cornell.mannlib.vitro.webapp.filestorage.model.ImageInfo.java

/**
 * If this Individual has a main image and a thumbnail, return their info.
 * Otherwise, return null./*from w  w  w . ja v a 2s .co m*/
 */
public static ImageInfo instanceFromEntityUri(WebappDaoFactory webappDaoFactory, Individual entity) {
    if (webappDaoFactory == null) {
        throw new NullPointerException("webappDaoFactory may not be null.");
    }

    if (entity == null) {
        return null;
    }

    IndividualDao individualDao = webappDaoFactory.getIndividualDao();

    String mainImageUri = entity.getMainImageUri();
    if (mainImageUri == null) {
        log.debug("Entity '" + entity.getURI() + "' had no associated main image.");
        return null;
    } else {
        log.debug("Entity '" + entity.getURI() + "' had associated main image: '" + mainImageUri + "'");
    }

    Individual mainFile = individualDao.getIndividualByURI(mainImageUri);
    if (mainFile == null) {
        log.error("Entity '" + entity.getURI() + "' has a main image URI that does not refer to an "
                + "individual: mainImageURI=" + mainImageUri);
        return null;
    }

    Individual thumbFile = mainFile.getRelatedIndividual(VitroVocabulary.FS_THUMBNAIL_IMAGE);
    if (thumbFile == null) {
        log.warn("Main image file '" + mainImageUri + "' had no associated thumbnail.");
        return null;
    } else {
        log.debug("Main image file '" + mainImageUri + "' had associated thumbnail: '" + thumbFile.getURI()
                + "'");
    }

    FileInfo mainInfo = FileInfo.instanceFromSurrogateUri(webappDaoFactory, mainFile.getURI());
    if (mainInfo == null) {
        log.error("Entity '" + entity.getURI() + "' has a mainImage that is not a File "
                + "surrogate: mainImageURI=" + mainImageUri);
        return null;
    }

    FileInfo thumbInfo = FileInfo.instanceFromSurrogateUri(webappDaoFactory, thumbFile.getURI());
    if (thumbInfo == null) {
        log.error("Entity '" + entity.getURI() + "' has a mainImage with a thumbnail that is not a File "
                + "surrogate: mainImageURI=" + mainImageUri + ", thumbnailURI=" + thumbFile.getURI());
        return null;
    }

    return new ImageInfo(mainInfo, thumbInfo);
}

From source file:Main.java

/**
 * This method returns the owner document of a particular node.
 * This method is necessary because it <I>always</I> returns a
 * {@link Document}. {@link Node#getOwnerDocument} returns <CODE>null</CODE>
 * if the {@link Node} is a {@link Document}.
 *
 * @param node//w  w  w  .  j  a va 2 s .com
 * @return the owner document of the node
 */
public static Document getOwnerDocument(Node node) {
    if (node.getNodeType() == Node.DOCUMENT_NODE) {
        return (Document) node;
    }
    try {
        return node.getOwnerDocument();
    } catch (NullPointerException npe) {
        throw new NullPointerException(npe.getMessage());
    }
}

From source file:com.github.wnameless.factorextractor.FactorExtractor.java

/**
 * Returns a Map{@literal <String, Object>} which is extracted from annotated
 * methods of input objects.//from  w  w w .j a v a2s.co  m
 * 
 * @param objects
 *          an array of objects
 * @return a Map{@literal <String, Object>}
 */
public static Map<String, Object> extract(Object... objects) {
    for (Object o : objects) {
        if (o == null)
            throw new NullPointerException("Null object is not allowed");
    }

    Map<String, Object> factors = new HashMap<String, Object>();
    for (Object o : objects) {
        Class<?> testClass = o.getClass();
        for (Method m : testClass.getMethods()) {
            Factor factor = AnnotationUtils.findAnnotation(m, Factor.class);
            if (factor != null) {
                try {
                    factors.put(factor.value(), m.invoke(o));
                } catch (InvocationTargetException wrappedExc) {
                    Throwable exc = wrappedExc.getCause();
                    Logger.getLogger(FactorExtractor.class.getName()).log(Level.SEVERE, m + " failed: " + exc,
                            wrappedExc);
                } catch (Exception exc) {
                    Logger.getLogger(FactorExtractor.class.getName()).log(Level.SEVERE,
                            "INVALID @Factor: " + m + exc, exc);
                }
            }
        }
    }

    return factors;
}

From source file:com.nabla.wapp.server.general.Assert.java

/**
 * Test if object is not null//from w  ww  .j ava  2s. c o  m
 * @param ref - object to test
 * @param message - exception message
 * @throws NullPointerException if object is null
 */
public static <T> void notNull(final T ref, final String message) throws NullPointerException {
    if (log.isDebugEnabled()) {
        if (ref == null)
            throw new NullPointerException(message);
    }
}

From source file:org.bigmouth.nvwa.network.http.utils.HttpUtils.java

public static HttpResponse post(HttpRequest request) throws UnexpectStatusCodeException, HttpException {
    if (null == request) {
        throw new NullPointerException("request");
    }// ww w.java 2s .  c  om
    request.setMethod(Method.POST);
    return access(request);
}