Generally this exception happen while having some encrypted character which where used for URL parameter encryption.

Exception in thread "main" javax.crypto.IllegalBlockSizeException: Input length must be multiple of 16 when decrypting with padded cipher
	at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:936)
	at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:847)
	at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)
	at javax.crypto.Cipher.doFinal(Cipher.java:2165)
	at security.EncryptionDecryptionURLParam.main(EncryptionDecryptionURLParam.java:51)

Solution :

Use below line of statements. Follow example below for more detail.

Not Use :

 byte[] decryptedPassword = cipher.doFinal(decodeStr.getBytes());

Use:

byte[] base64decodedTokenArr = Base64.decodeBase64(decodeStr.getBytes());
byte[] decryptedPassword = cipher.doFinal(base64decodedTokenArr);

Example :

• JAVA Encryption and Decryption of URL Parameter

Issues Solution

For more other JAVA/JDBC issues solution follow link JAVA/JDBC Issues.