Error while creating Java Source in database

Hi All,

I am creating a java source in oracle database using CREATE OR REPLACE JAVA SOURCE NAMED "mergepdf", but getting the below error after executing: alter java source "mergepdf" resolve;

Result from : SELECT * FROM user_errors WHERE name = 'mergepdf'

JAVA CLASS -
ORA-29535: source requires recompilation

JAVA SOURCE-
mergepdf:2: cannot find symbol
symbol  : class PDFDocMerger
location: package oracle.apps.xdo.common.pdf.util
import oracle.apps.xdo.common.pdf.util.PDFDocMerger;
                                       ^
mergepdf:22: cannot find symbol
symbol  : class PDFDocMerger
location: class mergepdf
      PDFDocMerger docMerger = new PDFDocMerger(inputStreams, outputStream);
      ^
mergepdf:22: cannot find symbol
symbol  : class PDFDocMerger
location: class mergepdf
      PDFDocMerger docMerger = new PDFDocMerger(inputStreams, outputStream);