Reproduction:
Step 0:
http://minecraft.gamepedia.com/Minecraft_Wiki
9.line: "Minecraft Classic is available to play for free. "

Step1:
"available to play" link activate --> https://minecraft.net/classic/play

Step 2:
in the Browser appear attachment_1,

Step 3: enable, and run
Step 4: enable, and run

Step 5: game freezes , see attachment_2

While java consol showing the folowing

Java Plug-in 10.45.2.18
Using JRE version 1.7.0_45-b18 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Admin
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to <n>
----------------------------------------------------
Missing Application-Name: manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Permissions manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Codebase manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Application-Name: manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Permissions manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Codebase manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Application-Name: manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Permissions manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Codebase manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lwjgl_util_applet.jar?v=15
Missing Application-Name: manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
Missing Permissions manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
Missing Codebase manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
Missing Application-Name: manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
Missing Permissions manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
Missing Codebase manifest attribute for: https://s3.amazonaws.com/MinecraftDownload/classic/lzma.jar?v=15
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.lwjgl.util.applet.AppletLoader$3.getPermissions(AppletLoader.java:713)
at java.security.SecureClassLoader.getProtectionDomain(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:755)
at org.lwjgl.util.applet.AppletLoader.run(AppletLoader.java:644)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.plugin2.applet.Plugin2ClassLoader.loadAllowedCodebases(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.getPermissions(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getPermissions(Unknown Source)
... 18 more
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.lwjgl.util.applet.AppletLoader$3.getPermissions(AppletLoader.java:713)
at java.security.SecureClassLoader.getProtectionDomain(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.mojang.minecraft.MinecraftApplet.init(Unknown Source)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:766)
at org.lwjgl.util.applet.AppletLoader.run(AppletLoader.java:644)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.plugin2.applet.Plugin2ClassLoader.loadAllowedCodebases(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.getPermissions(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getPermissions(Unknown Source)
... 19 more
Fatal error occured (8): access denied ("java.awt.AWTPermission" "createRobot")
java.security.AccessControlException: access denied ("java.awt.AWTPermission" "createRobot")
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at sun.plugin2.applet.AWTAppletSecurityManager.checkPermission(Unknown Source)
at java.awt.Robot.checkRobotAllowed(Unknown Source)
at java.awt.Robot.init(Unknown Source)
at java.awt.Robot.<init>(Unknown Source)
at com.mojang.minecraft.l.<init>(Unknown Source)
at com.mojang.minecraft.MinecraftApplet.init(Unknown Source)
at org.lwjgl.util.applet.AppletLoader.switchApplet(AppletLoader.java:766)
at org.lwjgl.util.applet.AppletLoader.run(AppletLoader.java:644)
at java.lang.Thread.run(Unknown Source)