java - Attribute value is null while trying to parse XML using dom4j -

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i trying parse xml string using dom4j. when try attribute value of node(element) return null value only.

this file contains xml:

<event xmlns='http://schemas.microsoft.com/win/2004/08/events/event'> <system>     <provider name='outlook'/>     <eventid qualifiers='16384'>63</eventid>     <level>4</level>     <task>0</task>     <keywords>0x80000000000000</keywords>     <timecreated systemtime='2015-07-23t13:45:26.000000000z'/>     <eventrecordid>27487</eventrecordid>     <channel>application</channel>     <computer>eglap0011-pc</computer> </system> <eventdata>     <data>the exchange web service request getappmanifests succeeded. </data> </eventdata> </event>

see below code:

bufferedreader br = null;         try         {             file inputfile = new file("d:\\eventlog\\xml_op.txt");             br = new bufferedreader(new filereader(inputfile));             string line="",con_line="";             int inc =0;             while((line = br.readline())!=null)             {                 con_line+=line;             }             document doc=documenthelper.parsetext(con_line);             element parent_ele = doc.getrootelement();              (iterator i1 = parent_ele.elementiterator("system"); i1.hasnext();)             {                  element sys = (element) i1.next();                                  system.out.println("------------------------------------------------");                  system.out.println("provider--> " + sys.attributevalue("name")); //i got null value here                  system.out.println("eventid--> " + sys.elementtext("eventid"));                  system.out.println("level--> " + sys.elementtext("level"));                  system.out.println("task--> " + sys.elementtext("task"));                  system.out.println("keywords--> " + sys.elementtext("keywords"));                  system.out.println("timecreated--> " + sys.attributevalue("systemtime"));//i got null value here                  system.out.println("eventrecordid--> " + sys.elementtext("eventrecordid"));                  system.out.println("channel--> " + sys.elementtext("channel"));                  system.out.println("computer--> " + sys.elementtext("computer"));                  system.out.println("------------------------------------------------");             }         }         catch(exception e)         {             e.printstacktrace();         }

the output of above code:

------------------------------------------------ provider--> null eventid--> 63 level--> 4 task--> 0 keywords--> 0x80000000000000 timecreated--> null eventrecordid--> 27487 channel--> application computer--> eglap0011-pc ------------------------------------------------

in above output, value of provider , time created null, have searched lot in websites, didn't correct solution problem, please share ideas. in advance,

your current node <system>. elementtext() function searches node, text , prints it, attributevalue() refers current node, have advance target , call there, like:

system.out.println("provider--> " + sys.element("provider").attributevalue("name"));

and

system.out.println("timecreated--> " + sys.element("timecreated").attributevalue("systemtime"));

so, replace in code , give try. yields:

------------------------------------------------ provider--> outlook eventid--> 63 level--> 4 task--> 0 keywords--> 0x80000000000000 timecreated--> 2015-07-23t13:45:26.000000000z eventrecordid--> 27487 channel--> application computer--> eglap0011-pc ------------------------------------------------

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