### Question:
PKCS11SignatureToken implements SignatureToken { public List<DSSPrivateKeyEntry> getPrivateKeyEntries() { return signatureTokenConnection.getKeys(); } PKCS11SignatureToken(String pkcs11ModulePath, char[] password, int slotIndex);  PKCS11SignatureToken(String pkcs11ModulePath, PasswordInputCallback passwordCallback, int slotIndex);  PKCS11SignatureToken(String pkcs11ModulePath, char[] password, int slotIndex, String label);  PKCS11SignatureToken(String pkcs11ModulePath, PasswordInputCallback passwordCallback, int slotIndex,
                                String label); List<DSSPrivateKeyEntry> getPrivateKeyEntries(); void usePrivateKeyEntry(DSSPrivateKeyEntry keyEntry); @Override X509Certificate getCertificate(); @Override byte[] sign(DigestAlgorithm digestAlgorithm, byte[] dataToSign);  }### Answer:
@Test public void selectCertificateWithPasswordCallback() throws Exception { PasswordInputCallback passwordCallback = new PrefilledPasswordCallback(new KeyStore.PasswordProtection("22975".toCharArray())); PKCS11SignatureToken signatureToken = new PKCS11SignatureToken(PKCS11SignatureTokenTest.PKCS_11_MODULE_PATH, passwordCallback, 2); List<DSSPrivateKeyEntry> privateKeyEntries = signatureToken.getPrivateKeyEntries(); Assert.assertNotNull(privateKeyEntries); Assert.assertFalse(privateKeyEntries.isEmpty()); this.assertSignatureHash(signatureToken, DigestAlgorithm.SHA256, this.dataToSign, this.expectedSignatureinHex); }