In a bid to beef up the security of Java applications, all versions of Java from v7 Update 51 will feature an enhanced security model making a user system less vulnerable to external exploits. This new security policy of Java will simply not allow users to run any java-application which is not signed (Unsigned), Self signed (not signed by trusted authority) or have missing permission attributes details in the manifest.

Since, this needs a fix on developers side users are simply blocked away from using Java applications which comes short in any of the above security considerations. I faced a similar issue where Dell's iDRAC 6 Virtual Console Client was denied execution by Java citing "Missing required Permissions manifest attribute in main jar" error. Since, there is no updated version of iDrac 6 Remote Console applet with fixed permissions we need to add an security exception for it as demonstrated below to let it run.

Online eFiling facility of Indian IncomeTax Department utilizes Java to enable core functionality of the website, including upload and signing of eReturns using digital signatures. Unfortunately, due to lack of update to support the most current Java 7 version, a user is shown the error as below when trying to digitally-sign and upload there XML return files. Things get even more mysterious when proper reason for the error is not available, although not without some work the error can be bypassed as instructed next.