"No X509TrustManager implementation available");    }     @Override    public void checkServerTrusted(X509Certificate[] chain, String authType,            SSLEngine engine) throws CertificateException {        throw new CertificateException(            "No X509TrustManager implementation available");    }} /* * A wrapper class to turn a X509KeyManager into an X509ExtendedKeyManager */final class AbstractKeyManagerWrapper extends X509ExtendedKeyManager {     private final X509KeyManager km;     AbstractKeyManagerWrapper(X509KeyManager km) {        this.km = km;    }     public String[] getClientAliases(String keyType, Principal[] issuers) {        return km.getClientAliases(keyType, issuers);    }     public String chooseClientAlias(String[] keyType, Principal[] issuers,            Socket socket) {        return km.chooseClientAlias(keyType, issuers, socket);    }     public String[] getServerAliases(String keyType, Principal[] issuers) {        return km.getServerAliases(keyType, issuers);    }     public String chooseServerAlias(String keyType, Principal[] issuers,            Socket socket) {        return km.chooseServerAlias(keyType, issuers, socket);    }     public X509Certificate[] getCertificateChain(String alias) {        return km.getCertificateChain(alias);    }     public PrivateKey getPrivateKey(String alias) {        return km.getPrivateKey(alias);    }     // Inherit chooseEngineClientAlias() and chooseEngineServerAlias() from    // X509ExtendedKeymanager. It defines them to return null;}  // Dummy X509KeyManager implementation, never returns any certificates/keys.// Used if the application did not specify a proper X509TrustManager.final class DummyX509KeyManager extends X509ExtendedKeyManager {     static final X509ExtendedKeyManager INSTANCE = new DummyX509KeyManager();     private DummyX509KeyManager() {        // empty    }     /*     * Get the matching aliases for authenticating the client side of a secure     * socket given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String[] getClientAliases(String keyType, Principal[] issuers) {        return null;    }     /*     * Choose an alias to authenticate the client side of a secure     * socket given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String chooseClientAlias(String[] keyTypes, Principal[] issuers,            Socket socket) {        return null;    }     /*     * Choose an alias to authenticate the client side of an     * engine given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String chooseEngineClientAlias(            String[] keyTypes, Principal[] issuers, SSLEngine engine) {        return null;    }     /*     * Get the matching aliases for authenticating the server side of a secure     * socket given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String[] getServerAliases(String keyType, Principal[] issuers) {        return null;    }     /*     * Choose an alias to authenticate the server side of a secure     * socket given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String chooseServerAlias(String keyType, Principal[] issuers,            Socket socket) {        return null;    }     /*     * Choose an alias to authenticate the server side of an engine     * given the public key type and the list of     * certificate issuer authorities recognized by the peer (if any).     */    public String chooseEngineServerAlias(            String keyType, Principal[] issuers, SSLEngine engine) {        return null;    }     /**     * Returns the certificate chain associated with the given alias.     *     * @param alias the alias name     *     * @return the certificate chain (ordered with the user's certificate first     * and the root certificate authority last)     */    public X509Certificate[] getCertificateChain(String alias) {        return null;    }     /*     * Returns the key associated with the given alias, using the given     * password to recover it.     *     * @param alias the alias name     *     * @return the requested key     */    public PrivateKey getPrivateKey(String alias) {        return null;    }}

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