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When you create entities file of the mysql table with JPA, auto increment field 'id' is mapped as follows.     @Id        @GeneratedValue(strategy = GenerationType.IDENTITY)     @Basic(optional = false)     @NotNull     @Column(name = "id")     private Long id; However, Oracle doesn't support auto increment. Hence sequence generator is set up for the field id of table. The respective entity mapping for 'id' should be changed as below.     @Id        @GeneratedValue(strategy = GenerationType.IDENTITY)     @Basic(optional = false)     @NotNull     @Column(name = "id")     private Long id;     @SequenceGenerator(initialValue=1, sequenceName="INVOICE_SEQ",allocationSize=1,name="invoice_seq_name")     @GeneratedValue(generator="invoice_seq_name")

jrxml content <image>                 <reportElement x="5" y="5" width="200" height="90"/>                 <imageExpression class=" java.awt.Image "><![CDATA[$P{logo}]]></imageExpression>             </image> Java Code to convert image from URL into BufferedImage        URL url = new URL("http://localhost/image/image.jpg");         // Read the image ...         InputStream inputStream = url.openStream();         ByteArrayOutputStream baos = new ByteArrayOutputStream();         byte[] buffer = new byte[1024];         int n = 0;         while (-1 != (n = inputStream.read(buffer))) {             baos.write(buffer, 0, n);         }                 baos.flush();         byte[] imageInByte = baos.toByteArray();         baos.close();         // convert byte array back to BufferedImage         InputStream in = new ByteArrayInputStream(imageInByte);         BufferedImage