Q: java

You don't.

Apple has barred Java from running on Macs, leaving companies that rely on Java plug-ins out in the cold.

Apple blocked Java 7 Update 11 by adding it to the banned list in XProtect.

This is the second time in two weeks that Apple has blocked Oracle's code from running on Macs. This time Java is blocked through Apple's XProtect anti-malware feature.

Java has come under fire as the means by which hackers have been able to gain control of computers. In April 2012 more than 600,000 Macs were reported to have been infected with a Flashback Trojan horse that was being installed on people's computers with the help of Java exploits. Then in August Macs were again at risk due to a flaw in Java, this time around, there was good news for Mac users: Thanks to changes Apple has made, most of us were safe from the threat.

Unwilling to leave its customers open to potential threats Apple has apparently decided it's safer to block Java entirely.

Macs running OS X Snow Leopard and beyond are affected.

Just go to safari preferences>security and make sure Java is unclicked.

UPDATE:

Oracle on Friday February 1 released a new version reportedly addressing vulnerabilities seen with the last build.

Apple disabled Java 7 through the OS X XProtect anti-malware system, requiring users to have at least version "1.7.0_10-b19" installed on their Macs. The release dated February 1 carries the designation "1.7.0_13-b20," meeting Apple's requirements.

Oracle "strongly recommends" applying the CPU fixes as soon as possible, saying that the latest Critical Patch Update contains 50 new security fixes across all Jave SE products.

WOW

Apple blocked Java 7 Update 11 by adding it to the banned list in XProtect.

Not the issue, since SL can't run Java 7, What Apple also did was block Java 6's JavaWebComponentVersionMinimum by adding 1.6.0_37-b06-435 in the list. See https://discussions.apple.com/message/21097168?ac_cid=tw123456#21097168 for details on how to restore Java functionality in SL.

Java 7 updated  for 10.7-10.8

Released Feb 1, 2013,  fixes 50+ security flaws
 
http://www.esecurityplanet.com/patches/oracle-responds-to-java-security-flaws-wi th-50-fixes.html

Download and install

 
https://www.java.com/en/download/faq/java_mac.xml
 

For Java versions 6 and below OS X 10.5-10.6 machines

Apple supplies their own version of Java. For Mac OS X 10.6 and below, use the Software Update feature available under the Apple menu to check that you have the most up-to-date version of Java 6 for your Mac.
 
https://www.java.com/en/download/faq/java_6.xml
  

Java SE 6 End of Public Updates
 
After February 2013, Oracle will no longer post updates of Java SE 6 to its public download sites. We highly recommend downloading and installing Java 7.

If your considering upgrading OS X from 10.6.8 to 10.8 via AppStore to run Java 7

Be forewarned no PowerPC based programs or driver software will run any longer.

Check here BEFORE you upgrade OS X!

http://roaringapps.com/apps:table

Alternatives if you must run Java 7

If Apple disabled Java 6 in 10.6, and you can't upgrade OS X to 10.8, then your pretty much done with Java in OS X because Oracle won't issue updates for Java 6 anymore.
 
However you can install Windows 7 and continue to use Java 7+ there until support for Windows 7 ends in 2020.

Windows in BootCamp or Virtual Machine?

If your on 10.6, I very highly recommend the free Virtualbox for the virtual machine software as it gets updates, VMFusion and Parallels have moved on with only 10.7+

Check Software Update...

APPLE-SA-2013-02-01-1 Java for Mac OS X v10.6 Update 12

 

Java for Mac OS X v10.6 Update 12 is now available and addresses the

following:

 

Java

Available for:  Mac OS X v10.6.8, Mac OS X Server v10.6.8

Impact:  Multiple vulnerabilities in Java 1.6.0_37

Description:  Multiple vulnerabilities exist in Java 1.6.0_37, the most serious of which may allow an untrusted Java applet to execute arbitrary code outside the Java sandbox. Visiting a web page containing a maliciously crafted untrusted Java applet may lead to arbitrary code execution with the privileges of the current user.

These issues are addressed by updating to Java version 1.6.0_39.

Further information is available via the Java website at http://www.oracle.com/technetwork/java/javase/releasenotes-136954.html