How to fix "java.lang.SecurityException: Missing required Permissions manifest attribute in main jar" [Solved]

If you are working Java Web start application using JNLP and suddenly started throwing "java.lang.SecurityException: Missing required Permissions manifest attribute in the main jar", then check whether you have updated the Java or JRE on your machine. From JDK 1.7 update 51, Java has tightened the security further with a number of changes like

1) Block all self-signed and unsigned Java applications and Applets if you have opted for HIGH security in Java Control Panel, which is also the default one.

2) Require a "Permission" attribute for a High-security setting

3) Warning users of missing permission attributes for the medium security settings.

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