Example usage for java.lang Class getDeclaredField

Introduction

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

Prototype

@CallerSensitive
public Field getDeclaredField(String name) throws NoSuchFieldException, SecurityException 

Source Link

Document

Returns a Field object that reflects the specified declared field of the class or interface represented by this Class object.

Usage

From source file:com.gigaspaces.internal.utils.ClassLoaderCleaner.java

private static void clearReferencesThreadLocals(ClassLoader classLoader) {
    Thread[] threads = getThreads();

    try {//from  w  w w  .ja va2  s. c o m
        // Make the fields in the Thread class that store ThreadLocals
        // accessible
        Field threadLocalsField = Thread.class.getDeclaredField("threadLocals");
        threadLocalsField.setAccessible(true);
        Field inheritableThreadLocalsField = Thread.class.getDeclaredField("inheritableThreadLocals");
        inheritableThreadLocalsField.setAccessible(true);
        // Make the underlying array of ThreadLoad.ThreadLocalMap.Entry objects
        // accessible
        Class<?> tlmClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");
        Field tableField = tlmClass.getDeclaredField("table");
        tableField.setAccessible(true);

        for (int i = 0; i < threads.length; i++) {
            Object threadLocalMap;
            if (threads[i] != null) {
                // Clear the first map
                threadLocalMap = threadLocalsField.get(threads[i]);
                clearThreadLocalMap(threadLocalMap, tableField, classLoader);
                // Clear the second map
                threadLocalMap = inheritableThreadLocalsField.get(threads[i]);
                clearThreadLocalMap(threadLocalMap, tableField, classLoader);
            }
        }
    } catch (Exception e) {
        logger.log(Level.WARNING, "Failed to clear ThreadLocal references", e);
    }
}

---

From source file:org.jfree.graphics2d.svg.SVGHints.java

private static RenderingHints.Key fetchKey(String className, String fieldName) {
    Class<?> hintsClass;
    try {//from ww  w. ja  va  2s . c  om
        hintsClass = Class.forName(className);
        Field f = hintsClass.getDeclaredField(fieldName);
        return (RenderingHints.Key) f.get(null);
    } catch (ClassNotFoundException e) {
        return null;
    } catch (NoSuchFieldException ex) {
        return null;
    } catch (SecurityException ex) {
        return null;
    } catch (IllegalArgumentException ex) {
        return null;
    } catch (IllegalAccessException ex) {
        return null;
    }
}

---

From source file:com.github.dozermapper.core.classmap.ClassMapBuilder.java

private static boolean requireMapping(Mapping mapping, Class<?> clazz, String fieldName, String pairName) {
    try {//w  ww  .  jav  a 2  s  . com
        return !mapping.optional() || (mapping.optional()
                && clazz.getDeclaredField(pairName.isEmpty() ? fieldName : pairName) != null);
    } catch (NoSuchFieldException e) {
        return false;
    }
}

---

From source file:com.bosscs.spark.commons.utils.Utils.java

/**
 * @param object/*from  w w w. j a v a  2  s.  co m*/
 * @param fieldName
 * @param fieldValue
 * @return if the operation has been correct.
 */
public static boolean setFieldWithReflection(Object object, String fieldName, Object fieldValue) {
    Class<?> clazz = object.getClass();
    while (clazz != null) {
        try {
            Field field = clazz.getDeclaredField(fieldName);
            field.setAccessible(true);
            field.set(object, fieldValue);
            return true;
        } catch (NoSuchFieldException e) {
            clazz = clazz.getSuperclass();
        } catch (Exception e) {
            throw new IllegalStateException(e);
        }
    }
    return false;
}

---

From source file:de.ailis.xadrian.utils.SwingUtils.java

/**
 * Sets the application name. There is no API for this (See
 * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6528430) so this
 * method uses reflection to do this. This may fail if the Java
 * implementation is changed but any exception here will be ignored.
 * //from   w  ww.  j  a  va 2 s  .c o m
 * The application name is currently only used for X11 desktops and only
 * important for some window managers like Gnome Shell.
 * 
 * @param appName
 *            The application name to set.
 */
public static void setAppName(final String appName) {
    final Toolkit toolkit = Toolkit.getDefaultToolkit();
    final Class<?> cls = toolkit.getClass();

    try {
        // When X11 toolkit is used then set the awtAppClassName field
        if (cls.getName().equals("sun.awt.X11.XToolkit")) {
            final Field field = cls.getDeclaredField("awtAppClassName");
            field.setAccessible(true);
            field.set(toolkit, appName);
        }
    } catch (final Exception e) {
        LOG.warn("Unable to set application name: " + e, e);
    }
}

---

From source file:com.gigaspaces.internal.utils.ClassLoaderCleaner.java

/**
 * This depends on the internals of the Sun JVM so it does everything by reflection.
 *//* w  ww.  ja  v  a  2  s.  co  m*/
private static void clearReferencesRmiTargets(ClassLoader classLoader) {
    try {
        // Need access to the ccl field of sun.rmi.transport.Target
        Class<?> objectTargetClass = Class.forName("sun.rmi.transport.Target");
        Field cclField = objectTargetClass.getDeclaredField("ccl");
        cclField.setAccessible(true);

        // Clear the objTable map
        Class<?> objectTableClass = Class.forName("sun.rmi.transport.ObjectTable");
        Field objTableField = objectTableClass.getDeclaredField("objTable");
        objTableField.setAccessible(true);
        Object objTable = objTableField.get(null);
        if (objTable == null) {
            return;
        }

        // Iterate over the values in the table
        if (objTable instanceof Map<?, ?>) {
            Iterator<?> iter = ((Map<?, ?>) objTable).values().iterator();
            while (iter.hasNext()) {
                Object obj = iter.next();
                Object cclObject = cclField.get(obj);
                if (classLoader == cclObject) {
                    iter.remove();
                }
            }
        }

        // Clear the implTable map
        Field implTableField = objectTableClass.getDeclaredField("implTable");
        implTableField.setAccessible(true);
        Object implTable = implTableField.get(null);
        if (implTable == null) {
            return;
        }

        // Iterate over the values in the table
        if (implTable instanceof Map<?, ?>) {
            Iterator<?> iter = ((Map<?, ?>) implTable).values().iterator();
            while (iter.hasNext()) {
                Object obj = iter.next();
                Object cclObject = cclField.get(obj);
                if (classLoader == cclObject) {
                    iter.remove();
                }
            }
        }
    } catch (Exception e) {
        logger.log(Level.WARNING,
                "Failed to clear context class loader referenced from sun.rmi.transport.Target ", e);
    }
}

---

From source file:com.google.code.siren4j.util.ReflectionUtils.java

public static Field findField(Class<?> clazz, String fieldName) throws NoSuchFieldException {
    Field field = null;//from   w w w . jav a2s.  co m
    try {
        field = clazz.getDeclaredField(fieldName);
    } catch (NoSuchFieldException e) {

    }
    if (field == null) {
        Class<?> superClazz = clazz.getSuperclass();
        if (superClazz != null) {
            field = findField(superClazz, fieldName);
        }
        if (field == null) {
            throw new NoSuchFieldException("Field: " + fieldName);
        } else {
            return field;
        }
    } else {
        return field;
    }
}

---

From source file:net.kamhon.ieagle.util.VoUtil.java

/**
 * To trim object String field/*from w  w w. ja va2s.c  om*/
 * 
 * @param all
 *            default is false. true means toTrim all String field, false toTrim the fields have
 *            net.kamhon.ieagle.vo.core.annotation.ToTrim.
 * 
 * @param objects
 */
public static void toTrimProperties(boolean all, Object... objects) {
    for (Object object : objects) {
        if (object == null) {
            continue;
        }

        // getter for String field only
        Map<String, Method> getterMap = new HashMap<String, Method>();
        // setter for String field only
        Map<String, Method> setterMap = new HashMap<String, Method>();

        Class<?> clazz = object.getClass();

        Method[] methods = clazz.getMethods();

        for (Method method : methods) {
            if (method.getName().startsWith("get") && method.getParameterTypes().length == 0
                    && method.getReturnType().equals(String.class)) {

                // if method name is getXxx
                String fieldName = method.getName().substring(3);
                fieldName = fieldName.substring(0, 1).toLowerCase() + fieldName.substring(1);

                getterMap.put(fieldName, method);
            } else if (method.getName().startsWith("set") && method.getParameterTypes().length == 1
                    && method.getParameterTypes()[0] == String.class
                    && method.getReturnType().equals(void.class)) {
                // log.debug("setter = " + method.getName());

                // if method name is setXxx
                String fieldName = method.getName().substring(3);
                fieldName = fieldName.substring(0, 1).toLowerCase() + fieldName.substring(1);

                setterMap.put(fieldName, method);
            }
        }

        // if the key exists in both getter & setter
        for (String key : getterMap.keySet()) {
            if (setterMap.containsKey(key)) {
                try {
                    Method getterMethod = getterMap.get(key);
                    Method setterMethod = setterMap.get(key);

                    // if not all, check on Field
                    if (!all) {
                        Field field = null;

                        Class<?> tmpClazz = clazz;
                        // looping up to superclass to get decleared field
                        do {
                            try {
                                field = tmpClazz.getDeclaredField(key);
                            } catch (Exception ex) {
                                // do nothing
                            }

                            if (field != null) {
                                break;
                            }

                            tmpClazz = tmpClazz.getSuperclass();
                        } while (tmpClazz != null);

                        ToTrim toTrim = field.getAnnotation(ToTrim.class);
                        if (toTrim == null || toTrim.trim() == false) {
                            continue;
                        }
                    }

                    String value = (String) getterMethod.invoke(object, new Object[] {});

                    if (StringUtils.isNotBlank(value))
                        setterMethod.invoke(object, value.trim());

                } catch (Exception ex) {
                    // log.error("Getter Setter for " + key + " has error ", ex);
                }
            }
        }
    }
}

---

From source file:eu.vital.vitalcep.restApp.cepRESTApi.CEPICO.java

public static int getPid(Process process) {
    try {//from w ww. j  a  va2s.  c  o m
        Class<?> cProcessImpl = process.getClass();
        java.lang.reflect.Field fPid = cProcessImpl.getDeclaredField("pid");
        if (!fPid.isAccessible()) {
            fPid.setAccessible(true);
        }
        return fPid.getInt(process);
    } catch (NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) {
        return -1;
    }
}

---

From source file:org.uimafit.factory.ConfigurationParameterFactory.java

/**
 * This method provides a convenient way to generate a configuration parameter name for a member
 * variable that is annotated with {@link org.uimafit.descriptor.ConfigurationParameter} and no
 * name is provided in the annotation./*from   w  w w  .j  a v  a2 s. c o  m*/
 */
public static String createConfigurationParameterName(Class<?> clazz, String fieldName)
        throws IllegalArgumentException {
    try {
        return ConfigurationParameterFactory.getConfigurationParameterName(clazz.getDeclaredField(fieldName));
    } catch (NoSuchFieldException e) {
        throw new IllegalArgumentException(e);
    }
}

---

• «
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20
• 21
• 22
• 23
• 24
• 25
• 26
• 27
• 28
• 29
• 30
• 31
• 32
• 33
• 34
• 35
• 36
• 37
• 38
• 39
• 40
• 41
• 42
• 43
• 44
• 45
• 46
• 47
• 48
• 49
• 50
• »