when try to get an inexist applet by getAppletContext().getApplet("test1"), an exception is threw
java.lang.NullPointerException
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter$AppletContextImpl.getApplet(Unknown Source)
at AppletContextTest.start(AppletContextTest.java:66)
at com.sun.deploy.uitoolkit.impl.awt.AWTAppletAdapter.start(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Exception result:
getAppletContext().getApplet("test1") should get a value of null in 7 as same as 6u24

Tested build: jdk7 b135-pit and 6u24
http://rehudson.sfbay.sun.com/hudsonws/deploypit/bundles/windows-i586/b255-2011-03-16_50/
http://jre.sfbay.sun.com/java/re/jdk/1.6.0_24/promoted/latest/bundles/windows-i586/
Tested OS: winxp sp3 x86
Tested browser: IE6 (cannot reproduce it on ff3.6)

Steps to reproduce
1) Open the following applet
http://sqeweb.sfbay.sun.com/jsn/users/sheldon/webCases/appletContext/AppletContextTest.html

2) The AppletContextTest.html failed to launch and get the exception in console. To validate, the applet should launch successfuly and get the information, >>>>[getApplet test] Get null successfully.

Attachment is the source code of testcase.