After upgrading to Java 7 update 71 JVM doesen't allow to run signed applets

How to reproduce:
- delete all 32-bit Java in Control Panel
- delete contents of c:\%USER%\AppData\LocalLow\Sun\
- install http://java.sun.com/update/1.7.0/jinstall-7u71-windows-i586.cab
- go to site https://www.sod.pfron.org.pl/ - URL, site contains signed aplets and SSL
You will get
" javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target "
Exception.
On previous version of java (update 51, update 67) everythings works fine.
But there are some differences between versions:
java 51 contains c:\%HOME%\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs
java 67 doesn't contains c:\%HOME%\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs but works
java 71 doesn't contains c:\%HOME%\AppData\LocalLow\Sun\Java\Deployment\security\trusted.certs and don't work

With Java 7u11 Oracle increased the default security level to help reduce the of recently discovered exploits getting past the security sandbox.
That said, I seem to recall from a few years ago that any untrusted component delivered to the client might cause the entire application to be treated as untrusted (as it should), and this may be the case here.
Although license issues may prevent you from doing this, I have found that unpacking and then repacking-and-resigning (with your own key) all 3rd party JARs can get around this, but only you can decide whether this is (a) legal and (b) advisable in the first place.

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