Here is a very simple code to reproduce it :

========================
bash-3.00$ cat Test.java
import java.security.*;
import sun.security.pkcs11.SunPKCS11;

public class Test {

    public static void main(String[] args) throws Exception {

            Provider p = new SunPKCS11(args[0]);
            Security.insertProviderAt(p, 1);

   }

}

============= Run with B62 =================

bash-3.00$ /java/re/jdk/7.0/promoted/all/b62/binaries/solaris-sparc/bin/javac Test.java
bash-3.00$ /java/re/jdk/7.0/promoted/all/b62/binaries/solaris-sparc/bin/java -Djava.security.manager Test ecprovider.cfg.bak
Error: Main method not found in class Test, please define the main method as:
   public static void main(String[] args)
Exception in thread "main" java.lang.RuntimeException: Main method not found in Test
        at sun.launcher.LauncherHelper.signatureDiagnostic(LauncherHelper.java:214)
        at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:202)

===============Run with b35======================

bash-3.00$ /java/re/jdk/7.0/promoted/all/b35/binaries/solaris-sparc/bin/javac Test.java
bash-3.00$ /java/re/jdk/7.0/promoted/all/b35/binaries/solaris-sparc/bin/java Test ecprovider.cfg.bak
bash-3.00$ /java/re/jdk/7.0/promoted/all/b35/binaries/solaris-sparc/bin/java -Djava.security.manager Test ecprovider.cfg.bak
Exception in thread "main" java.security.AccessControlException: access denied (java.lang.RuntimePermission accessClassInPackage.sun.security.pkcs11)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:345)
        at java.security.AccessController.checkPermission(AccessController.java:555)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
        at java.lang.SecurityManager.checkPackageAccess(SecurityManager.java:1529)
        at java.lang.ClassLoader$1.run(ClassLoader.java:349)
        at java.lang.ClassLoader$1.run(ClassLoader.java:347)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.lang.ClassLoader.checkPackageAccess(ClassLoader.java:347)
Error: Could not find the main class Test.
Error: A JNI error has occurred, please check your installation and try again

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When running with b62 , and enable java.security.manager , it thrown "Main method not found" RuntimeException , this is not the correct exception.
However , it looks like the behaviour of b35 is correct . this is a regression.