Bug #6401: Exception running transform: NullPointer exception found: net.sf.saxon.s9api.SaxonApiException - SaxonC - Saxonica Developer Community

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Bug #6401

closed

Exception running transform: NullPointer exception found: net.sf.saxon.s9api.SaxonApiException

Added by O'Neil Delpratt 7 months ago. Updated 5 months ago.

Status:

Closed

Priority:

Normal

Assignee:

O'Neil Delpratt

Category:

Saxon-C Internals

Start date:

2024-04-24

Due date:

% Done:

100%

Estimated time:

Applies to branch:

Fix Committed on Branch:

Fixed in Maintenance Release:

Found in version:

12.4.2

Fixed in version:

12.5

SaxonC Languages:

SaxonC Platforms:

SaxonC Architecture:

Description

Reported by user in the forum post: https://saxonica.plan.io/boards/4/topics/9646?r=9650#message-9650

I'm getting an NPE when I try setting a filename on the executable:

Python code:

        message_path: str = output_dir.joinpath('xslt-messages.xml').as_posix()
        executable.set_save_xsl_message(True, message_path);
        executable.transform_to_file(xdm_node=document)

Which results in this exception:

[ERROR] Exception running transform: NullPointer exception found: net.sf.saxon.s9api.SaxonApiException
        at net.sf.saxon.option.cpp.Xslt30Processor.transformToFile(Xslt30Processor.java:1585)
Caused by: java.lang.NullPointerException
        at net.sf.saxon.option.cpp.SaxonCMessageListener.<init>(SaxonCMessageListener.java:46)
        at net.sf.saxon.option.cpp.Xslt30Processor.applyXsltTransformerProperties(Xslt30Processor.java:1716)
        at net.sf.saxon.option.cpp.Xslt30Processor.transformToFile(Xslt30Processor.java:1561)

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Updated by O'Neil Delpratt 6 months ago

Status changed from New to In Progress

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Updated by O'Neil Delpratt 6 months ago

The java method createSaxonCMessageListener in the SaxonCMessageListener class has the wrong exceptionHandler. It should be using SaxonCExceptionLongHandler.class instead of SaxonCExceptionCLongPointerHandler.class. This causes us to miss the exception that is thrown.

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Updated by O'Neil Delpratt 6 months ago

With that fixed I think the unerlying problem is URI resolving issue:

Traceback (most recent call last):
  File "/Users/ond1/work/development/git/saxon-dev/saxondev/../misc/example3.py", line 15, in <module>
    executable.set_save_xsl_message(True, message_path)
  File "python_saxon/saxonc.pyx", line 2133, in saxoncee.PyXsltExecutable.set_save_xsl_message
saxoncee.PySaxonApiError: Unable to resolve <xsl_messages/xslt-messages.xml> into a Source. Line number: -1

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