Re: NPE in parser->getDOMImplementation() with CNI

[Andrew Haley <aph at redhat dot com>]

Mark Wielaard wrote:
> On Sun, 2009-06-21 at 16:46 +0100, Andrew Haley wrote:
>> Sam Ruby wrote:
>>> I'm trying to develop a JAXP implementation using CNI, but I get a
>>> NullPointerException when I try to get a DOMImplementation.  I've
>>> attached a small script (tested on Ubuntu 9.04) which demonstrates the
>>> problem.
>>>
>>> Any help would be appreciated.
>> Congratulations on this excellent test case.  Next time I want to tell
>> people how to do it right, I'll point them at your posting.
>>
>> However, I get
>>
>>  $ sh ~/testdomimpl.sh
>> gnu.xml.dom.DomDocumentBuilderFactory@160ecdad
>> gnu.xml.dom.DomDocumentBuilder@15ffbc45
>> gnu.xml.dom.DomImpl@15ef0ee5
>>
>> gnu.xml.dom.DomDocumentBuilderFactory@2df0bea7
>> gnu.xml.dom.DomDocumentBuilder@2de03d5f
>> gnu.xml.dom.DomImpl@2dd0bfdf
>>  $ gcj --version
>> gcj (GCC) 4.4.0 20090307 (Red Hat 4.4.0-0.23)
> 
> I get the same with that version of gcj.
> But on an older gcj installation:
> gcj (Debian 4.3.2-2) 4.3.2
> 
> gnu.xml.dom.DomDocumentBuilderFactory@6992f029
> gnu.xml.dom.DomDocumentBuilder@647a3539
> gnu.xml.dom.DomImpl@64826fa9
> 
> gnu.xml.dom.DomDocumentBuilderFactory@17d5dffb
> gnu.xml.dom.DomDocumentBuilder@12bcf52b
> java.lang.NullPointerException
>    at java.io.PrintStream.println(PrintStream.java:473)
> 
> That is somewhat strange since that method seems fine:
>   public void println (Object obj)
>   {
>     print(obj == null ? "null" : obj.toString(), true);
>   }
> 
> So maybe just upgrading to a newer Fedora and gcc 4.4 will be the
> solution, although I don't completely get what goes wrong on the old
> install.

I have no problem with 4.3 either.  I think this may be an install
problem or some sort of library path problem.

If you can point me to a failure I can debug I'll have a look.

Andrew.