Java Utililty Methods Reflection Field Find

Exception e = null;
Class<?> clas = claz;
while (claz != null) {
    for (String name : names) {
        try {
            return clas.getDeclaredField(name);
        } catch (Exception ee) {
            e = ee;
...

do {
    for (Field f : clazz.getDeclaredFields()) {
        if (f.getName().equals(field)) {
            return f;
} while ((clazz = clazz.getSuperclass()) != null);
return null;
...

return Arrays.stream(clazz.getDeclaredFields()).filter(f -> f.getName().equals(field)).findFirst()
        .orElse(null);

int temp = index;
for (Field f : clazz.getDeclaredFields())
    if ((field == null || f.getName().equals(field)) && type.isAssignableFrom(f.getType()) && temp-- <= 0)
        return f;
if (clazz.getSuperclass() != null)
    return findField(clazz.getSuperclass(), field, type, index);
return null;

Class<?> typeBeingSearched = clazz;
while (typeBeingSearched != null && !typeBeingSearched.equals(Object.class)) {
    Field[] fields = typeBeingSearched.getDeclaredFields();
    for (Field field : fields) {
        if (fieldName.equals(field.getName())) {
            return field;
    typeBeingSearched = typeBeingSearched.getSuperclass();
throw new IllegalStateException("Field (" + fieldName + ") could not be found in " + clazz.getName());

for (Field field : clazz.getDeclaredFields()) {
    if (field.getName().equals(fieldName))
        return field;
return null;

Class<?> current = clazz;
do {
    try {
        return current.getDeclaredField(fieldName);
    } catch (Exception e) {
} while ((current = current.getSuperclass()) != null);
throw new NoSuchFieldException(fieldName);
...

Field field = null;
try {
    field = clazz.getDeclaredField(fieldName);
} catch (NoSuchFieldException e) {
if (field == null) {
    Class<?> superClazz = clazz.getSuperclass();
    if (superClazz != null) {
...

if (clazz == null)
    throw new IllegalArgumentException("Null class");
if (fieldName == null)
    throw new IllegalArgumentException("Null field name");
try {
    Class<?> current = clazz;
    while (current != null) {
        try {
...

Field f = null;
try {
    f = clazz.getDeclaredField(fname);
} catch (NoSuchFieldException e) {
if (f == null && isSearchSuperclass) {
    do {
        clazz = clazz.getSuperclass();
...