FULL PRODUCT VERSION :
java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java Hotspot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing)

A DESCRIPTION OF THE PROBLEM :
Whenever a keystore is creating using the indirection of a builder and no inputstream or file is given, then the method call getKeyStore on the builder object will result in a ClassCastException. The latter stems from a typo in the source file KeyStoreSpi.java (starting from line 365):

ProtectionParameter protection = param.getProtectionParameter();
char[] password;
if (protection instanceof PasswordProtection) {
password = ((PasswordProtection)param).getPassword();
} else if (protection instanceof CallbackHandlerProtection) {
CallbackHandler handler =
((CallbackHandlerProtection)param).getCallbackHandler();

Instead of casting the variable param here it should be the variable protection.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Construct a keystore object using the indirection of a builder only specifying the keystore type and protection parameters using the method

KeyStore.Builder.newInstance(String, Provider, ProtectionParameter);

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The load operation loads the keystore without throwing an unrelated exception.
ACTUAL -
The load operation throws a ClassCastException.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.ClassCastException:
java.security.KeyStore$SimpleLoadStoreParameter
         at java.security.KeyStoreSpi.engineLoad(KeyStoreSpi.java:368)
         at java.security.KeyStore.load(KeyStore.java:1180)
         at java.security.KeyStore$Builder$2$1.run(KeyStore.java:1598)
         at java.security.AccessController.doPrivileged(Native Method)
         at java.security.KeyStore$Builder$2.getKeyStore(KeyStore.java:1607)
         at Test.main(Test.java:8)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class Test {
    public static void main(String[] args) {
        KeyStore.Builder builder = KeyStore.Builder.newInstance(keyStoreType,
            null, new PasswordDialog());
        KeyStore store = builder.getKeyStore();
    }
}
...
class PasswordDialog extends KeyStore.PasswordProtection {
    public PasswordDialog() {
        super(null);
    }
    
    public char[] getPassword() {
        return new char[]{'t', 'e', 's', 't'};
    }
}
---------- END SOURCE ----------