Starting with Java SE 7u21, Oracle offers a so-called Server JRE for download. This is a standard .tar.gz archive that you can extract anywhere on your computer. Although the download is called JRE, it contains a “normal” JDK subdirectory (including the javac compiler etc.).
Instructions:
- download the “Server JRE” from Java download site
- extract the .tar.gz
- add the bin subdirectory to your PATH