Java Utililty Methods File to Byte Array

FileInputStream fin = null;
byte arr[] = new byte[(int) file.length()];
try {
    fin = new FileInputStream(file);
    fin.read(arr);
} catch (IOException e) {
    throw new RuntimeException(e.getMessage(), e);
} finally {
...

ByteArrayOutputStream fileBytes = new ByteArrayOutputStream((int) file.length());
InputStream fileIn = new FileInputStream(file);
try {
    byte buffer[] = new byte[1024];
    int length;
    while ((length = fileIn.read(buffer)) > 0) {
        fileBytes.write(buffer, 0, length);
} finally {
    fileIn.close();
return fileBytes.toByteArray();

FileInputStream fin = new FileInputStream(path);
byte[] buffer = new byte[(int) fin.getChannel().size()];
try {
    if (fin.read(buffer) == -1) {
        throw new IOException("File " + path.getAbsolutePath() + " is empty");
} finally {
    fin.close();
...

FileInputStream fIn = null;
try {
    fIn = new FileInputStream(source);
    byte[] bytes = new byte[(int) source.length()];
    int read = 0;
    while (read < bytes.length) {
        int thisRead = fIn.read(bytes, read, bytes.length - read);
        if (thisRead == -1) {
...

return streamToBytes(new FileInputStream(f));

if (aFile == null)
    return null;
if (!aFile.exists())
    return null;
if (!aFile.canRead())
    return null;
if (aFile.isDirectory())
    return null;
...

long length = archiveFile.length();
int lengthFinalSize = 0;
if (length > Integer.MAX_VALUE) {
    throw new IllegalStateException("Capacity is over !");
} else {
    lengthFinalSize = (int) length;
FileInputStream fis = new FileInputStream(archiveFile);
...

InputStream is = null;
try {
    is = new FileInputStream(contentFile);
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    byte[] buf = new byte[BUFFER_SIZE];
    int read;
    while ((read = is.read(buf)) > 0) {
        os.write(buf, 0, read);
...

FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] result = getBytes(fis);
fis.close();
return result;

byte[] b = new byte[(int) f.length()];
FileInputStream fis;
try {
    fis = new FileInputStream(f);
} catch (FileNotFoundException e) {
    e.printStackTrace();
    return null;
try {
    fis.read(b);
    return b;
} catch (IOException e) {
    e.printStackTrace();
} finally {
    try {
        fis.close();
    } catch (IOException e) {
        e.printStackTrace();
return null;