Detecting a symlink in Java

Also you can use isSymbolicLink(Path path) method. It will be more reliable.

java.io.File file = ...;
boolean isSymbolicLink = Files.isSymbolicLink(file.toPath());

Similar examples from Java Doc 'Detecting a Symbolic Link'.

File.getCanonicalPath() resolves symlinks

A canonical pathname is both absolute and unique. The precise definition of canonical form is system-dependent. This method first converts this pathname to absolute form if necessary, as if by invoking the getAbsolutePath() method, and then maps it to its unique form in a system-dependent way. This typically involves removing redundant names such as "." and ".." from the pathname, resolving symbolic links (on UNIX platforms), and converting drive letters to a standard case (on Microsoft Windows platforms).

I assume you can compare the result of getCanonicalPath() and getAbsolutePath().

Update: It appears this question has already been asked - check the answers there