javax.crypto.BadPaddingException: Given final block not properly padded

后台解密 偶尔解密失败  重新调用都是成功的

byte[] encData =  Base64.decodeBase64(encryptedData);
byte[] ivStr = Base64.decodeBase64(iv);
byte[] key =  Base64.decodeBase64(sessionKey);
AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivStr);
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
String dataResult = new  String(cipher.doFinal(encData),"UTF-8");