GarciaPL Notes - Java and Others

I used to have a problem while I was developing some application using Django (Python Web Framework). This problem occurs when I received some data from some kind of source using for example JSON notation. When this data contains some custom characters which should be saved in Unicode notation, I received and error like this one :

Few days ago I had pleasure to install on my web server called XAMPP delivered by Apache Friends one of the management tool for PostgreSQL called PhpPgAdmin. I must to say that installation is very easy, all you have to do is to put extracted files of this tool to htdocs folder, edit config located on phpPgAdmin/conf/config.inc.php and just run index.php through your web browser.

Unfortunately in my case there was some issue with connecting to PostgreSQL database. I had message something like "Login disallowed". I spent a lot of time to figure out the right solution, which I am going to share with you.

Just go to file on this path - phpPgAdmin/conf/config.inc.php and just change

$conf['extra_login_security'] = true

$conf['extra_login_security'] = false

In the last days I was working on project which used one of the most powerful Javascript library jQuery in version 1.4.4. Yes, I know this version of jQuery is quite outdated. So, we decided to change it into jQuery 1.6.1. We expected some problems with change of library version, but what we discovered during looking for application errors was the change of handling of attributes and DOM object properties. I mean change function .attr to .prop

Before when we used jQuery 1.4.4 it was :

        
        
        
    
    
        
            Element 0
            Element 1
        
        Get property index
    

        
        
        
    
    
        
            Element 0
            Element 1
        
        Get property index
    

I would like to give you some advice how to solve the problem which brought you here. So, I had a problem with installing on Ubuntu 12.04.3 LTS one of Python module called PyXML which can be used for XML Processing. I would like to give below a very very long description of error which I was faced with during the installation of PyXML.

python2.5 setup.py build
running build
running build_py
running build_ext
building '_xmlplus.parsers.pyexpat' extension
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall 
-Wstrict-prototypes -fPIC -DXML_NS=1 -DXML_DTD=1 -DBYTEORDER=1234 
-DXML_CONTEXT_BYTES=1024 -DHAVE_MEMMOVE=1 -Iextensions/expat/lib 
-I/usr/include/python2.5 -c extensions/pyexpat.c -o 
build/temp.linux-i686-2.5/extensions/pyexpat.o
extensions/pyexpat.c:5:20: error: Python.h: No such file or directory
extensions/pyexpat.c:8:21: error: compile.h: No such file or directory
extensions/pyexpat.c:9:25: error: frameobject.h: No such file or directory
extensions/pyexpat.c:63: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:70: error: expected specifier-qualifier-list before 
‘PyObject_HEAD’
extensions/pyexpat.c:89: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘Xmlparsetype’
extensions/pyexpat.c:98: error: expected specifier-qualifier-list before 
‘PyCodeObject’
extensions/pyexpat.c:108: error: expected ‘)’ before ‘*’ token
extensions/pyexpat.c:123: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘have_handler’:
extensions/pyexpat.c:150: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:150: error: (Each undeclared identifier is reported 
only once
extensions/pyexpat.c:150: error: for each function it appears in.)
extensions/pyexpat.c:150: error: ‘handler’ undeclared (first use in this 
function)
extensions/pyexpat.c:150: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:154: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:201: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:214: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘flag_error’:
extensions/pyexpat.c:248: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:252: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:305: error: expected ‘)’ before ‘*’ token
extensions/pyexpat.c:332: error: expected ‘)’ before ‘*’ token
extensions/pyexpat.c:367: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:419: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘call_character_handler’:
extensions/pyexpat.c:444: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:444: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:445: error: ‘temp’ undeclared (first use in this 
function)
extensions/pyexpat.c:447: warning: implicit declaration of function 
‘PyTuple_New’
extensions/pyexpat.c:455: warning: implicit declaration of function 
‘conv_string_len_to_utf8’
extensions/pyexpat.c:458: warning: implicit declaration of function 
‘Py_DECREF’
extensions/pyexpat.c:462: warning: implicit declaration of function 
‘PyTuple_SET_ITEM’
extensions/pyexpat.c:464: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:465: warning: implicit declaration of function 
‘call_with_frame’
extensions/pyexpat.c:465: warning: implicit declaration of function 
‘getcode’
extensions/pyexpat.c:466: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:468: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘flush_character_buffer’:
extensions/pyexpat.c:482: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:482: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:484: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:484: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:485: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c: In function ‘my_CharacterDataHandler’:
extensions/pyexpat.c:493: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:496: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:496: error: ‘xmlparseobject’ has no member named 
‘buffer_size’
extensions/pyexpat.c:505: error: ‘xmlparseobject’ has no member named 
‘buffer_size’
extensions/pyexpat.c:507: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:510: warning: implicit declaration of function ‘memcpy’
extensions/pyexpat.c:510: warning: incompatible implicit declaration of 
built-in function ‘memcpy’
extensions/pyexpat.c:510: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:510: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:512: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c: In function ‘my_StartElementHandler’:
extensions/pyexpat.c:524: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:524: error: ‘container’ undeclared (first use in 
this function)
extensions/pyexpat.c:524: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:524: warning: left-hand operand of comma expression 
has no effect
extensions/pyexpat.c:524: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:524: warning: left-hand operand of comma expression 
has no effect
extensions/pyexpat.c:532: error: ‘xmlparseobject’ has no member named 
‘specified_attributes’
extensions/pyexpat.c:533: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c:541: error: ‘xmlparseobject’ has no member named 
‘ordered_attributes’
extensions/pyexpat.c:542: warning: implicit declaration of function 
‘PyList_New’
extensions/pyexpat.c:544: warning: implicit declaration of function 
‘PyDict_New’
extensions/pyexpat.c:550: error: ‘n’ undeclared (first use in this function)
extensions/pyexpat.c:550: warning: implicit declaration of function 
‘string_intern’
extensions/pyexpat.c:551: error: ‘v’ undeclared (first use in this function)
extensions/pyexpat.c:557: warning: implicit declaration of function 
‘conv_string_to_utf8’
extensions/pyexpat.c:564: error: ‘xmlparseobject’ has no member named 
‘ordered_attributes’
extensions/pyexpat.c:565: warning: implicit declaration of function 
‘PyList_SET_ITEM’
extensions/pyexpat.c:568: warning: implicit declaration of function 
‘PyDict_SetItem’
extensions/pyexpat.c:579: warning: implicit declaration of function 
‘Py_BuildValue’
extensions/pyexpat.c:585: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:587: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:588: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_EndElementHandler’:
extensions/pyexpat.c:636: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:636: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:636: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:636: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:636: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:636: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_ProcessingInstructionHandler’:
extensions/pyexpat.c:640: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:640: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:640: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:640: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:640: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:640: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:640: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_UnparsedEntityDeclHandler’:
extensions/pyexpat.c:646: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:646: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:646: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:646: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:646: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:646: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_EntityDeclHandler’:
extensions/pyexpat.c:659: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:659: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:659: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:659: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:659: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:659: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_XmlDeclHandler’:
extensions/pyexpat.c:696: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:696: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:696: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:696: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:696: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:696: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:696: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:705: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘my_ElementDeclHandler’:
extensions/pyexpat.c:737: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:737: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:740: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:741: error: ‘modelobj’ undeclared (first use in 
this function)
extensions/pyexpat.c:741: error: ‘nameobj’ undeclared (first use in this 
function)
extensions/pyexpat.c:741: warning: left-hand operand of comma expression 
has no effect
extensions/pyexpat.c:751: warning: implicit declaration of function 
‘conv_content_model’
extensions/pyexpat.c:751: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:769: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:771: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:772: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:780: warning: implicit declaration of function 
‘Py_XDECREF’
extensions/pyexpat.c:781: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c: In function ‘my_AttlistDeclHandler’:
extensions/pyexpat.c:785: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:785: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:785: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:785: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:785: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:785: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:785: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_SkippedEntityHandler’:
extensions/pyexpat.c:798: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:798: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:798: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:798: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:798: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:798: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_NotationDeclHandler’:
extensions/pyexpat.c:806: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:806: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:806: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:806: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:806: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:806: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_StartNamespaceDeclHandler’:
extensions/pyexpat.c:816: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:816: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:816: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:816: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:816: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:816: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_EndNamespaceDeclHandler’:
extensions/pyexpat.c:823: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:823: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:823: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:823: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:823: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:823: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_CommentHandler’:
extensions/pyexpat.c:828: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:828: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:828: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:828: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:828: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:828: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:828: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_StartCdataSectionHandler’:
extensions/pyexpat.c:832: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:832: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:832: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:832: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:832: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:832: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_EndCdataSectionHandler’:
extensions/pyexpat.c:836: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:836: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:836: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:836: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:836: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:836: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_DefaultHandler’:
extensions/pyexpat.c:841: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:841: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:841: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:841: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:841: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:841: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_DefaultHandlerExpandHandler’:
extensions/pyexpat.c:845: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:845: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:845: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:845: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:845: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:845: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_NotStandaloneHandler’:
extensions/pyexpat.c:862: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:862: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:862: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:862: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:862: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:862: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:862: warning: implicit declaration of function 
‘PyInt_AsLong’
extensions/pyexpat.c: In function ‘my_ExternalEntityRefHandler’:
extensions/pyexpat.c:866: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:866: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:866: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:866: error: ‘conv_string_to_utf8’ undeclared (first 
use in this function)
extensions/pyexpat.c:866: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:866: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:866: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_StartDoctypeDeclHandler’:
extensions/pyexpat.c:881: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:881: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:881: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:881: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:881: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:881: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: In function ‘my_EndDoctypeDeclHandler’:
extensions/pyexpat.c:889: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:889: error: ‘args’ undeclared (first use in this 
function)
extensions/pyexpat.c:889: error: ‘rv’ undeclared (first use in this 
function)
extensions/pyexpat.c:889: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c:889: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:889: error: ‘xmlparseobject’ has no member named 
‘in_callback’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:893: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:912: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:930: error: expected declaration specifiers or 
‘...’ before ‘PyObject’
extensions/pyexpat.c: In function ‘readinst’:
extensions/pyexpat.c:932: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:932: error: ‘arg’ undeclared (first use in this 
function)
extensions/pyexpat.c:933: error: ‘bytes’ undeclared (first use in this 
function)
extensions/pyexpat.c:934: error: ‘str’ undeclared (first use in this 
function)
extensions/pyexpat.c:937: warning: implicit declaration of function 
‘PyInt_FromLong’
extensions/pyexpat.c:948: warning: implicit declaration of function 
‘PyObject_CallObject’
extensions/pyexpat.c:948: error: ‘meth’ undeclared (first use in this 
function)
extensions/pyexpat.c:956: warning: implicit declaration of function 
‘PyString_Check’
extensions/pyexpat.c:957: warning: implicit declaration of function 
‘PyErr_Format’
extensions/pyexpat.c:957: error: ‘PyExc_TypeError’ undeclared (first use 
in this function)
extensions/pyexpat.c:962: warning: implicit declaration of function 
‘PyString_GET_SIZE’
extensions/pyexpat.c:964: error: ‘PyExc_ValueError’ undeclared (first 
use in this function)
extensions/pyexpat.c:970: warning: incompatible implicit declaration of 
built-in function ‘memcpy’
extensions/pyexpat.c:970: warning: implicit declaration of function 
‘PyString_AsString’
extensions/pyexpat.c:970: warning: passing argument 2 of ‘memcpy’ makes 
pointer from integer without a cast
extensions/pyexpat.c:970: note: expected ‘const void *’ but argument is 
of type ‘int’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:981: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1044: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1062: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1077: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1108: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1203: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1223: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1242: error: array type has incomplete element type
extensions/pyexpat.c:1243: error: ‘PyCFunction’ undeclared here (not in 
a function)
extensions/pyexpat.c:1243: error: expected ‘}’ before ‘xmlparse_Parse’
extensions/pyexpat.c:1245: error: expected ‘}’ before ‘xmlparse_ParseFile’
extensions/pyexpat.c:1247: error: expected ‘}’ before ‘xmlparse_SetBase’
extensions/pyexpat.c:1249: error: expected ‘}’ before ‘xmlparse_GetBase’
extensions/pyexpat.c:1251: error: expected ‘}’ before 
‘xmlparse_ExternalEntityParserCreate’
extensions/pyexpat.c:1253: error: expected ‘}’ before 
‘xmlparse_SetParamEntityParsing’
extensions/pyexpat.c:1255: error: expected ‘}’ before 
‘xmlparse_GetInputContext’
extensions/pyexpat.c:1258: error: expected ‘}’ before 
‘xmlparse_UseForeignDTD’
extensions/pyexpat.c:1320: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘xmlparse_dealloc’:
extensions/pyexpat.c:1395: warning: implicit declaration of function 
‘PyObject_GC_Fini’
extensions/pyexpat.c:1397: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c:1398: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c:1399: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c:1401: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1402: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:1402: error: ‘temp’ undeclared (first use in this 
function)
extensions/pyexpat.c:1404: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1405: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1408: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1409: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1411: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1412: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1413: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1415: error: ‘xmlparseobject’ has no member named 
‘intern’
extensions/pyexpat.c:1418: warning: implicit declaration of function 
‘PyObject_Del’
extensions/pyexpat.c: In function ‘handlername2int’:
extensions/pyexpat.c:1430: warning: implicit declaration of function 
‘strcmp’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:1437: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1445: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1549: error: expected declaration specifiers or 
‘...’ before ‘PyObject’
extensions/pyexpat.c: In function ‘sethandler’:
extensions/pyexpat.c:1554: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:1554: error: ‘temp’ undeclared (first use in this 
function)
extensions/pyexpat.c:1554: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1556: error: ‘v’ undeclared (first use in this 
function)
extensions/pyexpat.c:1556: error: ‘Py_None’ undeclared (first use in 
this function)
extensions/pyexpat.c:1559: warning: implicit declaration of function 
‘Py_INCREF’
extensions/pyexpat.c:1562: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:1564: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:1571: error: expected declaration specifiers or 
‘...’ before ‘PyObject’
extensions/pyexpat.c: In function ‘xmlparse_setattr’:
extensions/pyexpat.c:1574: error: ‘v’ undeclared (first use in this 
function)
extensions/pyexpat.c:1575: warning: implicit declaration of function 
‘PyErr_SetString’
extensions/pyexpat.c:1575: error: ‘PyExc_RuntimeError’ undeclared (first 
use in this function)
extensions/pyexpat.c:1579: warning: implicit declaration of function 
‘PyObject_IsTrue’
extensions/pyexpat.c:1580: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1581: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1581: error: ‘xmlparseobject’ has no member named 
‘buffer_size’
extensions/pyexpat.c:1582: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1583: warning: implicit declaration of function 
‘PyErr_NoMemory’
extensions/pyexpat.c:1586: error: ‘xmlparseobject’ has no member named 
‘buffer_used’
extensions/pyexpat.c:1589: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1592: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1593: error: ‘xmlparseobject’ has no member named 
‘buffer’
extensions/pyexpat.c:1599: error: ‘xmlparseobject’ has no member named 
‘ns_prefixes’
extensions/pyexpat.c:1601: error: ‘xmlparseobject’ has no member named 
‘ns_prefixes’
extensions/pyexpat.c:1602: error: ‘xmlparseobject’ has no member named 
‘itself’
extensions/pyexpat.c:1602: error: ‘xmlparseobject’ has no member named 
‘ns_prefixes’
extensions/pyexpat.c:1607: error: ‘xmlparseobject’ has no member named 
‘ordered_attributes’
extensions/pyexpat.c:1609: error: ‘xmlparseobject’ has no member named 
‘ordered_attributes’
extensions/pyexpat.c:1615: error: ‘PyExc_ValueError’ undeclared (first 
use in this function)
extensions/pyexpat.c:1623: error: ‘xmlparseobject’ has no member named 
‘returns_unicode’
extensions/pyexpat.c:1628: error: ‘xmlparseobject’ has no member named 
‘specified_attributes’
extensions/pyexpat.c:1630: error: ‘xmlparseobject’ has no member named 
‘specified_attributes’
extensions/pyexpat.c:1642: error: too many arguments to function 
‘sethandler’
extensions/pyexpat.c:1645: error: ‘PyExc_AttributeError’ undeclared 
(first use in this function)
extensions/pyexpat.c: At top level:
extensions/pyexpat.c:1676: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘Xmlparsetype’
extensions/pyexpat.c:1719: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1766: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c:1778: error: array type has incomplete element type
extensions/pyexpat.c:1779: error: expected ‘}’ before ‘pyexpat_ParserCreate’
extensions/pyexpat.c:1781: error: expected ‘}’ before ‘pyexpat_ErrorString’
extensions/pyexpat.c:1797: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or 
‘__attribute__’ before ‘*’ token
extensions/pyexpat.c: In function ‘initpyexpat’:
extensions/pyexpat.c:1835: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:1835: error: ‘m’ undeclared (first use in this 
function)
extensions/pyexpat.c:1835: error: ‘d’ undeclared (first use in this 
function)
extensions/pyexpat.c:1835: warning: left-hand operand of comma 
expression has no effect
extensions/pyexpat.c:1836: error: ‘errmod_name’ undeclared (first use in 
this function)
extensions/pyexpat.c:1836: warning: implicit declaration of function 
‘PyString_FromString’
extensions/pyexpat.c:1837: error: ‘errors_module’ undeclared (first use 
in this function)
extensions/pyexpat.c:1838: error: ‘modelmod_name’ undeclared (first use 
in this function)
extensions/pyexpat.c:1839: error: ‘model_module’ undeclared (first use 
in this function)
extensions/pyexpat.c:1840: error: ‘sys_modules’ undeclared (first use in 
this function)
extensions/pyexpat.c:1848: error: ‘Xmlparsetype’ undeclared (first use 
in this function)
extensions/pyexpat.c:1848: error: ‘PyType_Type’ undeclared (first use in 
this function)
extensions/pyexpat.c:1851: warning: implicit declaration of function 
‘Py_InitModule3’
extensions/pyexpat.c:1855: error: ‘ErrorObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:1856: warning: implicit declaration of function 
‘PyErr_NewException’
extensions/pyexpat.c:1862: warning: implicit declaration of function 
‘PyModule_AddObject’
extensions/pyexpat.c:1866: error: expected expression before ‘)’ token
extensions/pyexpat.c:1868: warning: implicit declaration of function 
‘get_version_string’
extensions/pyexpat.c:1869: warning: implicit declaration of function 
‘PyModule_AddStringConstant’
extensions/pyexpat.c:1889: warning: implicit declaration of function 
‘PySys_GetObject’
extensions/pyexpat.c:1890: warning: implicit declaration of function 
‘PyModule_GetDict’
extensions/pyexpat.c:1891: warning: implicit declaration of function 
‘PyDict_GetItem’
extensions/pyexpat.c:1893: warning: implicit declaration of function 
‘PyModule_New’
extensions/pyexpat.c:1918: error: ‘list’ undeclared (first use in this 
function)
extensions/pyexpat.c:1921: warning: implicit declaration of function 
‘PyErr_Clear’
extensions/pyexpat.c:1926: error: ‘item’ undeclared (first use in this 
function)
extensions/pyexpat.c:1933: warning: implicit declaration of function 
‘PyList_Append’
extensions/pyexpat.c:1996: warning: implicit declaration of function 
‘PyModule_AddIntConstant’
extensions/pyexpat.c: In function ‘clear_handlers’:
extensions/pyexpat.c:2023: error: ‘PyObject’ undeclared (first use in 
this function)
extensions/pyexpat.c:2023: error: ‘temp’ undeclared (first use in this 
function)
extensions/pyexpat.c:2027: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:2029: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:2030: error: ‘xmlparseobject’ has no member named 
‘handlers’
extensions/pyexpat.c:2032: error: ‘xmlparseobject’ has no member named 
‘itself’
error: command 'gcc' failed with exit status 1

sudo apt-get install python-dev

I would like to present a small example of using Data Access Object (DAO) in Spring. This is a kind of component which provides unified interface to communication between application and source of data for instance database or file. Application using DAO does not have to know the way the data is stored or manipulated in database. This component is commonly used in MVC (Model-View-Controller) which allows to separate data access model from business logic and presentation layer. In this example datasource is NoSQL Database MongoDB.

Below I put some example of DAO Entity called SettingsDao and its Implementation called SettingsDaoImpl.

Entity SettingsDAO :

package pl.eventoo.mongodb.dao;

import pl.eventoo.domain.Settings;

/**
 * Interface of credentials settings
 *
 * @author lukasz
 */
public interface SettingsDao {

    /**
     * Interface for save credentials
     *
     * @param settings 
     */
    public void saveSettings(Settings settings);
    
    /**
     * Interface for update credentials
     * 
     * @param settings
     * @return
     */
    public boolean updateSettings(Settings settings);

    /**
     * Interface for read credentials
     *
     * @return
     */
    public Settings readSettings();
}

package pl.eventoo.mongodb.dao;

import com.google.code.morphia.DAO;
import com.google.code.morphia.query.UpdateOperations;
import com.google.code.morphia.query.UpdateResults;
import pl.eventoo.domain.Settings;
import pl.eventoo.mongodb.factory.MongoConnectionManager;

/**
 * Implementation Dao for credentials settings
 *
 * @author lukasz
 */
public class SettingsDaoImpl extends DAO Settings, String implements SettingsDao {

    public SettingsDaoImpl() {
        super(Settings.class, MongoConnectionManager.instance().getDb());
    }

    @Override
    public void saveSettings(Settings settings) {
        save(settings);
    }

    @Override
    public Settings readSettings() {
        return ds.find(Settings.class).get();
    }

    @Override
    public boolean updateSettings(Settings settings) {
        UpdateOperations createUpdateOperations = ds.createUpdateOperations(Settings.class).set("interval_cron", settings.getInterval_cron()).set("time_difference_event", settings.getTime_difference_event());
        UpdateResults update = ds.update(ds.createQuery(Settings.class), createUpdateOperations);
        return update.getHadError();
    }
}

I must say that this one diagram of SQL Joins is one of the most memorizing image about how joins in sql works. Enjoy :)

SQL Joins Explain