JDBC 7.1.2 compilation failed

After ./configure --with-java compilation (gmake) for 7.1.2 on RH 7.1
box failed with this error:

    [javac]
/tmp/postgresql-7.1.2/src/interfaces/jdbc/example/blobtest.java:189:
Class example.Blob not found in type declaration.
    [javac]             Blob b = rs.getBlob("a");
    [javac]             ^
    [javac]
/tmp/postgresql-7.1.2/src/interfaces/jdbc/example/blobtest.java:189:
Method getBlob(java.lang.String) not found in interface
java.sql.ResultSet.
    [javac]             Blob b = rs.getBlob("a");
    [javac]                                ^
    [javac] 2 errors

Thanks for reading this.

    Regards,
       lwd.