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One way is to sign it with a proper cert
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<blockquote>
 or downgrade your version of Java jre to an older version. 
</blockquote>
Definitely not. That will leave your system vulnerable to malware. Java is right up at the top as a malware vector
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I know that with the older versions : 1.6 , dialogbox does not appear, but i don't want to downgrade. <br />
Application is not supported by us so not possible to sign it.<br />
<br />
Any other suggestion?
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<blockquote>
Application is not supported by us so not possible to sign it.
</blockquote>
That doesn't stop you signing it actually
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Is the Java application on a server you maintain. It may then be possible to modify the application to get it signed. It depends whether the application is part of a jar (Java ARchive) file or just running the java class file.<br />
<br />
Checkout the article below:<br />
<a href="http://stackoverflow.com/questions/908748/how-do-i-sign-a-java-applet-for-use-in-a-browser" rel="ugc">http://stackoverflow.com/questions/908748/how-do-i-sign-a-java-applet-for-use-in-a-browser</a><br />
<br />
All you need is access to a JRE and Jdk and a valid certificate to allow you to sign it.
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application is hosted on server which is not supported by us.
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Well you need to get it taken down, signed and put back up again
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It won't scale well, but you could also look at the policy file approach<br />
<br />
<a href="http://docs.oracle.com/javase/tutorial/security/tour1/index.html" rel="ugc">http://docs.oracle.com/javase/tutorial/security/tour1/index.html</a><br />
<br />
The thing is - there's so much in flux with applets at the moment that the above might not work - so be careful
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<div class="content wysiwyg-content">
when I updated java version from 7.21 to 7.51 I start receiving a dialog box which says &quot;&nbsp;an unsigned application from the location below is requesting permissions to run&quot; with options &quot;Run&quot; or &quot;cancel&quot;. When I click on Run application is started successfully.<br />
Is there any way to remove this dialogbox?<br />
What I have tried till now.<br />
- lower java security settings to medium(it's the lowest level in my version of java)<br />
- add website to security list exceptions in java control panel(security tab)<br />
- add website to trusted sites in IE<br />
-check in IE - advanced -security- allow active content to run..,allow software to run or install ...<br />
Till now I am not able to remove this dialogbox with security warning.<br />
Please for help <br />
<a href="https://filedb.experts-exchange.com/incoming/2014/03_w11/839433/JavaSecurityWarnings.png" target="_blank" title="javasecuritywarning (31 KB)"><img alt="javasecuritywarning" class="file-block lazyload" style="max-width: 611px;" data-src="https://filedb.experts-exchange.com/incoming/2014/03_w11/839433/JavaSecurityWarnings.png" /></a>
</div>
</div>


JavaSecurityWarnings.png

when I updated java version from 7.21 to 7.51 I start receiving a dialog box which says " an unsigned application from the location below is requesting permissions to run" with options "Run" or "cancel". When I click on Run application is started successfully.
Is there any way to remove this dialogbox?
What I have tried till now.
- lower java security settings to medium(it's the lowest level in my version of java)
- add website to security list exceptions in java control panel(security tab)
- add website to trusted sites in IE
-check in IE - advanced -security- allow active content to run..,allow software to run or install ...
Till now I am not able to remove this dialogbox with security warning.
Please for help 


java 1.7 security warning- an unsigned application

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.

Microsoft Legacy OS

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

This topic area includes legacy versions of Windows prior to Windows 2000: Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions including Windows Mobile.