Saxon: java.lang.NullPointerException from Builder.setPrevie

Using Saxon 5.4.1 Java API with Sun JDK 1.2.2 on RedHat Linux 6.0 (with
updates) with default parser, etc.

Trying to right a very simple "identity"Java utilty that reads an XML
file and copies/writes the results on stdout (ie System.out).

(code fragment)-------------------------------------------
...
PreviewManager pm = new PreviewManager();
pm.setPreviewMode( "preview" );
pm.setPreviewElement( new Name( "ROW" ) );
Builder b = new Builder()
b.setPreviewManager( pm )
DocumentInfo docinfo = b.build( new ExtendedInputSource( new File(
filename ) ) );
....

(A) ---------------------------------------------------
IF
    b.setPreviewManager( pm ) has been called
    and
    XML source file filename has no <DOCTYPE .... >
    or souce XML file has a <DOCTYPE ...> but the source is invalid for
the referenced DTD
THEN
    the call to b.build( .... ) above fails with nothing but a
"java.lang.NullPointerException".

(B)---------------------------------------------------
IF
    b.setPreviewManager( pm ) has NOT been called
    and
    XML source file filename has no <DOCTYPE .... >
    or souce XML file has a <DOCTYPE ...> but the source is invalid for
the referenced DTD
THEN
    the call to b.build( .... ) above succeeds BUT no output is produced

    [see post "no DTD, bad DTD generates no error, no output"]

(C)---------------------------------------------------
IF
    b.setPreviewManager( pm ) has been called
    and XML source file has a <DOCTYPE...> and is valid for that DTD
THEN
    the call to b.build(...) succeeds and output is produced.

---------------------------------------------------

If a DTD is always required, then I think situation A should generate an

error not a java.lang.NullPointerException.

If a DTD is not required, then I think situation A should not fail and
both situation A and B should produce output

I am trying to find out if these are bugs or incorrect useage by someone

new to Saxon.

Thanks

R.Parr
Temporal Arts
330 S. Yellowstone Drive, Suite 3
Madison, WI 53705, U.S.A.
608.833.4578
RParr@xxxxxxxxxxxxxxxx




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