Java Utililty Methods Is Symbolic Link

if (file == null) {
    throw new NullPointerException("File must not be null");
File fileInCanonicalDir = null;
if (file.getParent() == null) {
    fileInCanonicalDir = file;
} else {
    File canonicalDir = file.getParentFile().getCanonicalFile();
...

try {
    final File canonicalFile = file.getCanonicalFile();
    final File absoluteFile = file.getAbsoluteFile();
    final File parentFile = file.getParentFile();
    return !canonicalFile.getName().equals(absoluteFile.getName()) ||
            parentFile != null && !parentFile.getCanonicalPath().equals(canonicalFile.getParent());
} catch (IOException e) {
    return true;
...

return !file.getAbsolutePath().equals(file.getCanonicalPath());

try {
    File parent = file.getParentFile();
    String name = file.getName();
    File toTest = parent != null ? new File(parent.getCanonicalPath(), name) : new File(name);
    return !toTest.getAbsolutePath().equals(toTest.getCanonicalPath());
} catch (Exception e) {
    return false;

if (parent == null) {
    File f = new File(name);
    parent = f.getParentFile();
    name = f.getName();
File toTest = new File(parent.getCanonicalPath(), name);
return !toTest.getAbsolutePath().equals(toTest.getCanonicalPath());

if (base == null) {
    throw new NullPointerException("Base file must not be null");
if (curious == null) {
    throw new NullPointerException("Curious file must not be null");
File baseCanonical = base.getCanonicalFile();
File curiousResolved = new File(baseCanonical, curious.getPath());
...

return !file.getAbsolutePath().equals(file.getCanonicalPath());

String baseName = file.getName();
String canonicalPathExceptBaseName = new File(file.getParentFile().getCanonicalFile(), baseName).getPath();
return !file.getCanonicalPath().equals(canonicalPathExceptBaseName);

if (file == null) {
    throw new NullPointerException("File must not be null");
if (isSystemWindows()) {
    return false;
File fileInCanonicalDir = null;
if (file.getParent() == null) {
...

if (file == null) {
    throw new NullPointerException("File must not be null");
if (isSystemWindows()) {
    return false;
File fileInCanonicalDir = null;
if (file.getParent() == null) {
...