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Код


package testkeystore;

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.security.*;
import java.security.cert.CertificateFactory;
import java.util.Enumeration;
import javax.crypto.KeyGenerator;
import java.security.cert.*;
import javax.crypto.SecretKey;

public class Main {

    public Main() {
    }
    public static void main(String[] args) {
        try {
 // Загружаем KeyStore. Нет проблем.
            java.security.KeyStore ks = java.security.KeyStore.getInstance(KeyStore.getDefaultType());
            FileInputStream fis = new FileInputStream("ClientKeyStore");
            ks.load( fis, "clientpassword".toCharArray());
            fis.close();
 // Генерируем секретный ключ для DES алгоритма. Нет проблем.           
            KeyGenerator kg = KeyGenerator.getInstance("DES");
            SecretKey kp = kg.generateKey();
            
            KeyStore.SecretKeyEntry myEntry = new KeyStore.SecretKeyEntry(kp);
            KeyStore.ProtectionParameter password =
                    new KeyStore.PasswordProtection("clientkeypassword".toCharArray());
// Пытаемся сохранить ключ, не выходит :-(
             ks.setEntry("secretKeyAlias", myEntry, password);

//          store away the keystore
            java.io.FileOutputStream fos = new java.io.FileOutputStream("newKeyStoreName.txt");
            ks.store(fos, "clientpassword".toCharArray());
            fos.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        
    }
    
}

Код


java.security.KeyStoreException: Cannot store non-PrivateKeys
        at sun.security.provider.JavaKeyStore.engineSetKeyEntry(Unknown Source)
        at java.security.KeyStoreSpi.engineSetEntry(Unknown Source)
        at java.security.KeyStore.setEntry(Unknown Source)
        at testkeystore.Main.main(Main.java:53)