JPA, Mysql Blob returns data too long

It all depends on the column type used for the picture column. Depending on your needs, use a:

• TINYBLOB: maximum length of 255 bytes
• BLOB: maximum length of 65,535 bytes
• MEDIUMBLOB: maximum length of 16,777,215 bytes
• LONGBLOB: maximum length of 4,294,967,295 bytes

Note that if you generate your table from the JPA annotations, you can “control” the type MySQL will use by specifying the length attribute of the Column, for example:

@Lob @Basic(fetch = FetchType.LAZY)
@Column(length=100000)
private byte[] picture;

Depending on the length, you’ll get:

       0 < length <=      255  -->  `TINYBLOB`
     255 < length <=    65535  -->  `BLOB`
   65535 < length <= 16777215  -->  `MEDIUMBLOB`
16777215 < length <=    2³¹-1  -->  `LONGBLOB`