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https://issues.apache.org/jira/browse/XALANC-636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12471065
 ] 

David Bertoni commented on XALANC-636:
--------------------------------------

This call stack does not make any sense at all, so I suspect GDB is not 
reporting it correctly.  Note that there is an unhandled exception, so the 
solution may just be that you need a try/catch block in your code to handle 
exceptions.

If you want someone to investigate this issue, then you need to provide us with 
a test case we can use to reproduce the problem.  I don't see any actual 
Xalan-C or Xerces-C code in the information you provided.  Please try to 
provide a minimal sample of Xalan-C and Xerces-C code that reproduces the 
problem.

> Null pointer when using XPathEvaluator::selectNodeList
> ------------------------------------------------------
>
>                 Key: XALANC-636
>                 URL: https://issues.apache.org/jira/browse/XALANC-636
>             Project: XalanC
>          Issue Type: Bug
>          Components: XalanC
>    Affects Versions: 1.10
>         Environment: Linux
>            Reporter: fred C
>            Priority: Blocker
>
> Hi,
> I perform a simple test with a simple XML file :
> the code :
> -------------
> //Initialization ConfigurationServer & Loader
> FileConfigLoader fileConfigLoader;
> ConfigurationServer<> configurationServer ;
>                       
> std::wstring file3;
> file3.append(L"PhysicalEnt.xml");
> fileConfigLoader.addRepository(L"/Root/entities.*",file3); 
> configurationServer.setLoader(&fileConfigLoader);
>               
> /* Test 1: ConfigDOMNodeListPtr entitieslist3 = 
> configurationServer.selectNodes(L"/Root/entities/*"); */
> ConfigDOMNodePtr entNode = configurationServer.selectSingleNode 
> (L"/Root/entities");
> ConfigDOMNodeListPtr entitieslist = entNode->selectNodes(L"entity");
> /* Test 2 :ConfigDOMNodeListPtr entitieslist = entNode->selectNodes(L"*"); */
>                                               
> //fill the map                                        
> for (int i=0; i< entitieslist->get_length() ; i++) 
> {
> std::cout <<  " Iteraction : " << i << std::endl;
>       //gathering data for the map key                                
>       ConfigDOMNodePtr structElem  = entitieslist->nextNode();
>       ConfigDOMNodeListPtr structParamsNodes = 
> structElem->selectNodes(L"physicalEntity/entityType/*");
>       unsigned int entityKind         = 
> (ConfigurationServer<>::NodeConverter) structParamsNodes->nextNode();
>       unsigned int domain     = (ConfigurationServer<>::NodeConverter) 
> structParamsNodes->nextNode();
> std::cout <<  " EntityKind : " << entityKind << std::endl;
> }
> The XML file : 
> -------------------
> Fichier 'PhysicalEnt.xml':
> <entities>
>     <entity>
>         <physicalEntity>
>             <entityType>
>                 <entityKind>1</entityKind>
>                 <domain>1</domain>
>                 <countryCode>1</countryCode>
>                 <category>1</category>
>                 <subcategory>1</subcategory>
>                 <specific>1</specific>
>                 <extra>1</extra>
>             </entityType>
>         </physicalEntity>
>     </entity>
>     <entity>
>         <physicalEntity>
>             <entityType>
>                 <entityKind>2</entityKind>
>                 <domain>2</domain>
>                 <countryCode>2</countryCode>
>                 <category>2</category>
>                 <subcategory>2</subcategory>
>                 <specific>2</specific>
>                 <extra>2</extra>
>             </entityType>
>         </physicalEntity>
>     </entity>
> </entities>
> When running this, I have the error :
> ------------------------------------------------
>        ldd CS_test.x.msb05023
>        linux-gate.so.1 =>  (0xffffe000)
>        libACE.so.5 => /usr/lib/libACE.so.5 (0xb7e94000)
>        libxerces-c.so.27 => 
> /home/nhbwb/ghemires/xerces-c-src_2_7_0/lib/libxerces-c.so.27 (0xb7ad3000)
>        libxalan-c.so.110 => 
> /home/nhbwb/ghemires/xml-xalan/c/lib/libxalan-c.so.110 (0xb7645000)
>        libxalanMsg.so.110 => 
> /home/nhbwb/ghemires/xml-xalan/c/lib/libxalanMsg.so.110 (0xb763e000)
>        libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x429fd000)
>        libm.so.6 => /lib/tls/libm.so.6 (0x4270e000)
>        libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x429d3000)
>        libc.so.6 => /lib/tls/libc.so.6 (0x425e2000)
>        librt.so.1 => /lib/tls/librt.so.1 (0x42494000)
>        libdl.so.2 => /lib/libdl.so.2 (0x42733000)
>        libpthread.so.0 => /lib/tls/libpthread.so.0 (0x42814000)
>        /lib/ld-linux.so.2 (0x41dae000)
> (gdb) where
> #0  0xffffe410 in __kernel_vsyscall ()
> #1  0x426097d5 in raise () from /lib/tls/libc.so.6
> #2  0x4260b149 in abort () from /lib/tls/libc.so.6
> #3  0x42a9f1db in __gnu_cxx::__verbose_terminate_handler () from 
> /usr/lib/libstdc++.so.6
> #4  0x42a9cef1 in __cxa_call_unexpected () from /usr/lib/libstdc++.so.6
> #5  0x42a9cf26 in std::terminate () from /usr/lib/libstdc++.so.6
> #6  0x42a9d06f in __cxa_throw () from /usr/lib/libstdc++.so.6
> #7  0xb7c384df in xercesc_2_7::DOMDocumentImpl::createElement () from 
> /home/nhbwb/ghemires/xerces-c-src_2_7_0/lib/libxerces-c.so.27
> #8  0xb77e481f in xalanc_1_10::NodeRefList::operator= () from 
> /home/nhbwb/ghemires/xml-xalan/c/lib/libxalan-c.so.110
> #9  0xb7826184 in xalanc_1_10::XPathEvaluator::selectNodeList () from 
> /home/nhbwb/ghemires/xml-xalan/c/lib/libxalan-c.so.110
> #10 0x0805a624 in ConfigXercesDOMNode::selectNodes (this=0xbffff4b0, [EMAIL 
> PROTECTED])
>    at 
> /usr/lib/gcc/i386-redhat-linux/3.4.4/../../../../include/c++/3.4.4/bits/basic_string.h:418
> #11 0x0804cca8 in main (argc=1, argv=0xbffff5b4) at ../CS_test_main.cpp:37
> I can't fix the problem.
> I rebuild Xalan, but the same.
> Thanks;
> Fred.

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