System Programming

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Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.

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object aid

when i try to add object aid uml plugin worked on one laptop

other laptop
when i gave the name

Name as Object Aid UML Explorer
Location http://objectaid.com/update/current

from eclipse-->help->install new softwares


getting below error

Unable to read repository at http://objectaid.com/update/current/content.xml.
Unable to read repository at http://objectaid.com/update/current/content.xml.
Malformed reply from SOCKS server


please advise
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Cloud Class® Course: Python 3 Fundamentals
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when we go to eclipse market place vs when we go
install new software option under eclise-->help

please advise
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1 Comment
objectaid ul plugin now working

i went to eclipse -->help--->install new software

then i put url
http://www.objectaid.net/update
it brings windwo with saying
Add Repository
with 3 text boxes
Name
Location
not sure what to give above text boxes
after some times says
it says coulld find
http://www.objectaid.net/update

please advise
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4 Comments
eclipse keplan through help market place i installed glassfih tools

i also downloaded the glass fish 5 from
https://javaee.github.io/glassfish/download

when go to file new server add glassfish locations says only 4 and 3.1 versions of glassfish supported
i tried to search internet to get glasfish 4 or 4.1 etc but could not find

can you please advise where i have to go to get it

please advise
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1 Comment
Hi All,

I am looking for a free open source POS system with no licensing which i can customise myself and use.

Anyone has any recommendations?
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1 Comment
Hi Experts,
I have this question after solving the following..
https://www.experts-exchange.com/questions/29108803/Script-to-read-all-files-of-specific-folder.html#acceptAnswerByMember
In that question I got a script how to count all records of files in one folder.
However now I need to know from that count how many are under one specific category.
Therefore I thought the best way would be to concatenate all files into one, just ignoring the headers.
And from there I will link to MS Access and get the results from a query.
Anyone has either a script for that or another way to accomplish the task?
Thanks in advance.
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6 Comments
Hi Experts,
I am looking for a script that will read all files of a specific folder (.txt,.csv) and count how many records they're in total.
all files have fields header, however some files only contains the header and should not be count.
Thanks in advance.
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6 Comments
what are differences between

stateless
stateful
singleton
mdb enterprise java beans.

when to use which one

any practical examples on them to see differences.

any links, resources, videos?
please advise
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3 Comments
tail -f logfile.log


what is the meaning of above command.

i see logs rolling too fast.

is there is a way i can slow it down to see clearly slowly

any god tips, links, resources on how to debug production logs efficiently just using putty without any fancy costly tools?

please advise
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5 Comments
what is the best tool to do profiling for c++ multi threaded server daemon on Linux?

Complied program with -pg and the tried with gprof/gmon.out. Couldn't find call graph as per functions mentioned in my program. It has shown all low level api's call graph like string internals, memory allocations..etc.

Can someone suggest how to get call graph from gmon.out for multi threaded server daemon.

Any other tool(s)?
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2 Comments
Cloud Class® Course: Microsoft Windows 7 Basic
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This introductory course to Windows 7 environment will teach you about working with the Windows operating system. You will learn about basic functions including start menu; the desktop; managing files, folders, and libraries.

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hi,



I am not clear on producer extends vs consumer super​ for generics



usually in ejb jms mdb world

if some one says consumer means who consumes messages which producer puts in queue right



But here concept seems reverse

producer extends

can read but cannot add
 consumer super​​
can add but cannot read to list?


please advise
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1 Comment
why String is an Object but Collection<String> is not a Collection<Object> with respect to unbounded wildcards of java generics

Please advise
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2 Comments
Hi Experts,
I am looking for an Access file that was used about a month ago, however cant remember the name and since there were more recent files used, I cannot get to see them from under Access recent files list..
Is there any way I can get a list of all my Access files used in past month, along with date last opened?
Files can be either on the server or on local C drive.
Thanks in advance
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5 Comments
Hi Experts,
I created today a new task from task scheduler wizard and its not working.
Dont even see that listed under all other tasks!!
However under C:\Windows\System32\Tasks I see it.
How can I troubleshoot this?
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13 Comments
Hi, using the following article, I am unable build a basic expert system using Microsoft Excel (2010/2013/2016) to answer 3 questions and then produce or display report.  I reviewed a couple of articles online using Microsoft excel but not having much luck.  I am not sure if excel is appropriate.  The goal is to open a spreadsheet, answer the questions (like an survey), and view the results.  When finished click close or exit the spreadsheet.

Article URL: https://www.wkastudio.com/Tutorials/Creating%20expert%20system%20from%20rules%20stored%20in%20spreadsheets_Wine%20Selection.pdf

Reference
Question 1: What is your Major?
Response ID1: Math
Response ID2: Technology
Response ID3: English

Question 2: What is is your Grade level?
Response ID Q1: Freshman
Response ID Q2: Sophomore
Response ID Q3: Junior
Response ID Q3: Senior

NOTE: Question #3 is asked if one of the following responses is selected: Sophomore, Junior, or Senior.  If Freshman is selected then the class report is ran.

Question 3:Have you completed your general education English 1&2, Math 1&2, and Science 1&2 level courses?
Response ID Q1: Yes
Response ID Q2: No

---End of Questions---

Class report is generated

Please share any articles and suggestions.
0
5 Comments
Hi Experts,
Looking for a script that gives me all large files created on the server in the past 10 days..
should return file name, date created, size of file, user created.
Thanks in advance.
0
24 Comments
Hi Experts,
2 strange things suddenly happening to my PC's
1- The task manager got disabled
2- when I type in something then right click to select that work for spelling, it loses the selection.
Any reason behind these..?
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21 Comments
I have been trying to follow the videos and extract data from an HTML file and I was able to do so on my system. BUT when I try to use the same code/module to extract data from the html file from my Friend's system it shows me an "error 91: object variable or with block not set" at line 2 and sometime even at line 1. Basically it is not reading the html document on a different system. The HTMLButton1  when tried in debug.print show nothing
Dim file As String
Dim IE As New SHDocVw.InternetExplorerMedium
Dim HTMLDoc As MSHTML.HTMLDocument
Dim HTMLButton1


file = "C:\temp\HTML\page1.html"

IE.Visible = False
IE.navigate file 'line 1
Do While IE.Busy = True
Loop

Set HTMLDoc = IE.Document
Set HTMLButton1 = HTMLDoc.elementFromPoint(338, 462)


array_objects(index).date = HTMLButton1.innerText 'line2


IE.Quit
Set IE = Nothing

Open in new window
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1 Comment
I am getting below error


[INFO] Scanning for projects...
Some problems were encountered while processing the POMs:
[FATAL] Non-resolvable parent POM for com.example.howtodoinjava:spring-boot-soap-service:0.0.1-SNAPSHOT: Failure to find org.springframework.boot:spring-boot-starter-parent:pom:2.0.0.M4 in http://111.2.222.111:8081/archiva/repository/internal was cached in the local repository, resolution will not be reattempted until the update interval of archiva has elapsed or updates are forced and 'parent.relativePath' points at no local POM @ line 14, column 10
 @
The build could not read 1 project -> [Help 1]
 
  The project com.example.howtodoinjava:spring-boot-soap-service:0.0.1-SNAPSHOT (C:\Users\gmy\tes\spring boot_webservices_soap_rest\spring-boot-soap-service\pom.xml) has 1 error
    Non-resolvable parent POM for com.example.howtodoinjava:spring-boot-soap-service:0.0.1-SNAPSHOT: Failure to find org.springframework.boot:spring-boot-starter-parent:pom:2.0.0.M4 in http://111.2.222.111:8081/archiva/repository/internal was cached in the local repository, resolution will not be reattempted until the update interval of archiva has elapsed or updates are forced and 'parent.relativePath' points at no local POM @ line 14, column 10 -> [Help 2]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

…
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2 Comments
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spring boot security

how SimplePasswordValidationCallbackHandler dfferent from other implementatons like
SpringCertificateValidationCallbackHandler

SpringDigestPasswordValidationCallbackHandler


what is meaning of call back handler

Please advise
0
2 Comments
hi,
while working with the SOAP web service i gave below as request from wizdler.

<Envelope xmlns="http://schemas.xmlsoap.org/soap/envelope/">
   
   
    <Body>
        <GetCourseDetailsRequest xmlns="http://xyz.com/courses">
            <id>123</id>
        </GetCourseDetailsRequest>
    </Body>
</Envelope>

i am getting below response when i click go button with POST method selected from drop down

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <SOAP-ENV:Fault>
            <faultcode>SOAP-ENV:Client</faultcode>
            <faultstring xml:lang="en">com.sun.xml.wss.XWSSecurityException: Message does not conform to configured policy [ AuthenticationTokenPolicy(S) ]:  No Security Header found; nested exception is com.sun.xml.wss.XWSSecurityException: com.sun.xml.wss.XWSSecurityException: Message does not conform to configured policy [ AuthenticationTokenPolicy(S) ]:  No Security Header found</faultstring>
        </SOAP-ENV:Fault>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>


can you please advise how to resolve this
whizler1.png
0
4 Comments
while executing spring boot soap example keep getting error like below

Description:

The Tomcat connector configured to listen on port 8081 failed to start. The port may already be in use or the connector may be misconfigured.

Action:

Verify the connector's configuration, identify and stop any process that's listening on port 8081, or configure this application to listen on another port.


I tried 8080 as well in application.properties even that did not work


how to find what ports are free on my windows 10 laptop to use that ?

please advise
0
5 Comments
what are differences between project explorer and package explorer in eclipse.

how to open package explorer by default when opening eclipse

Please advise
0
2 Comments
Are SOAP web services are state-full

I read REST ones are stateless

https://www.tutorialspoint.com/restful/restful_statelessness.htm

Please advise
0
2 Comments
Hi Experts,
Wondering why are my programs not always listed under start/my programs?!
I was looking for a program installed there about a month ago, and was listed there under my programs as well..
Today when I was looking for it, it was nowhere to be found!!
And I had forgotten the name of it..
Luckily I had this program installed in another pc where it was still being listed..
Once I got the name, I was able to type in and it opened.
But why all this hide and seek?!
0
11 Comments

System Programming

40K

Solutions

24

Content

i
The collection of articles, videos, and posts on this topic.

19K

Contributors

Kernel and system programming is the process of creating the software necessary for a computer or device to function and operate other programs. Some operating systems (such as Microsoft Windows) are proprietary, but others, such as the various Linux distributions, are open source.

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