### Question:
JCEHandler { public byte[] encryptData(byte[] data, Key key) throws JCEHandlerException { return doCryptStuff(data, key, Cipher.ENCRYPT_MODE); } JCEHandler(String jceProviderClassName);  JCEHandler(Provider provider); Key generateDESKey(short keyLength); byte[] encryptDESKey(short keyLength, Key clearDESKey, Key encryptingKey); Key decryptDESKey(short keyLength, byte[] encryptedDESKey, Key encryptingKey, boolean checkParity); byte[] encryptData(byte[] data, Key key); byte[] decryptData(byte[] encryptedData, Key key); byte[] encryptDataCBC(byte[] data, Key key, byte[] iv); byte[] decryptDataCBC(byte[] encryptedData, Key key, byte[] iv); byte[] generateMAC(byte[] data, Key kd, String macAlgorithm);  }### Answer:
@Test public void testEncryptDataThrowsNullPointerException() throws Throwable { byte[] data = new byte[1]; try { new JCEHandler((Provider) null).encryptData(data, null); fail("Expected NullPointerException to be thrown"); } catch (NullPointerException ex) { if (isJavaVersionAtMost(JAVA_14)) { assertNull(ex.getMessage(), "ex.getMessage()"); } else { assertEquals("Cannot invoke \"java.security.Key.getAlgorithm()\" because \"key\" is null", ex.getMessage(), "ex.getMessage()"); } } }