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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I have used Octopus Deploy but never Jenkins.

What are some big differences?

Thanks
0
A program calls some open source programs.  Can the calling program and all the open source programs be installed in the server?  The reason I ask this is because If all the programs are single threaded and a user can call the open source programs independently of the call made by the main program that runs in the server, there may be collisions.  Is there any issue I should be aware of for a situation like that?
0
Hello. I have a <asp:CheckBoxList> with 4 ListItems.  I would like to know how I can tell which if any of those checkboxes are checked.  To be more specific I would like to know if the other box is checked and if so a panel should stay visible.  So far this is what I have:

<asp:CheckBoxList ID="cblEduAssistPlans" runat="server" SelectedIndexChanged="cblEduAssistPlans_SelectedIndexChanged" AutoPostBack="true">
                       <asp:ListItem>Individualized education program (IEP)</asp:ListItem>
                       <asp:ListItem>Individualized Family Service Plan (IFSP)</asp:ListItem>
                       <asp:ListItem>504 Plan</asp:ListItem>
                       <asp:ListItem>Other</asp:ListItem>
                   </asp:CheckBoxList>

right now, when the other box is checked the panel displays (which is what I want).  But if I check on anything else it disappears.  The user should be able to check multiple boxes. But if Other is one of the checked boxes a panel should be visible. If Other is not checked or unchecked the the panel should disappear.  Here is the code that is supposed to run when other is checked.

Protected Sub cblEduAssistPlans_SelectedIndexChanged(sender As Object, e As EventArgs)
        If (cblEduAssistPlans.SelectedValue = "Other") Then
            pnlEduAssistPlans.Visible = True
        End If
    End Sub
0
Hi

Delphi 10.1 Berlin
I have written an app to monitor a folder (new files, delete files) and it does not work in some cases.
- locally it works
- if i start the application on PC1, monitor a folder on the server, add a file in that folder on PC1 it works
- if I add a file to that folder but on the server (not PC1) it does not work (but on some networks this also works!). If I have open the file explorer on PC1 I can see the added file some ms later - but my app doesn't show it.
My code
procedure TForm31.FormCreate(Sender: TObject);
var
    isf : IShellFolder;
    Eaten, attr : DWord;
    pidl : pItemIDList;
begin
  snh := TShellNotifyHandler.Create(self);
  snh.OnShellNotify := ShellNotifyHandler1;
  snh.ShellMsg := WM_User+100;
  snh.Events := [seDelete, seRenameItem, seCreate];
  snh.Recursive := true;
  SHGetDesktopFolder(isf);
  isf.ParseDisplayName(self.Handle, nil, PWideChar(ExtractFilePath(ParamStr(0))), Eaten, pidl, attr);
  label1.Caption := ExtractFilePath(ParamStr(0));
  snhHandle := snh.RegisterPIDL(self.Handle,pidl);
end;

procedure TForm31.ShellNotifyHandler1(Sender: TObject; LEvent: TShellEvent;
  pidl1, pidl2: PItemIDList);
var
    SRec: TSearchRec;
    Res : integer;
begin
  ListBox1.Clear;
  Res := FindFirst(IncludeTrailingPathDelimiter(ExtractFilePath(ParamStr(0)))+'*.*', faAnyFile, SRec);
  while Res = 0 do
  begin
    if (SRec.Name <> '.') and (SRec.Name <> '..') then
      ListBox1.Items.Add(SRec.Name);
    Res := FindNext(SRec);
  end;
  

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0
Hi,

I imported one project as existing maven project. I am seeing below error while adding tomcat 8 as runtime

An internal error occurred during: "Updating workspace".
assertion failed: Mismatched begin/endOperation


While resolving below errror by going to properties
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

please advise
0
hi,
how to see options in advanced rest client options missing in latest version.
latest AvancedRestClient Launched From StartMenu looks quite different as attached.
i am not able to see actual response as well but just able to see response header alone

please advise
AdvanceRestClientOptions.png
latestAvancedRestClientLaunchedFromS.png
latestAvancedRestClientLaunchedFromS.png
0
hi,

when i  try to missing junit to build path showing 2 options. i wonder why it shows same option 2 times. please advise
JUNitBuildPAth.png
0
while opening team explored in eclipse mars getting below error

Plug-in "com.microsoft.tfs.client.common.ui" was unable to instantiate class "com.microsoft.tfs.client.common.ui.views.TeamExplorerView".


how to resolve this.

Please advise
0
Hi,

i wrote my web application with web.xml as below

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
<welcome-file-list>
    <welcome-file>simple.jsp</welcome-file>
</welcome-file-list>
	<security-constraint>
		<web-resource-collection>
			<web-resource-name>MyResources</web-resource-name>
			<url-pattern>/*</url-pattern>
		</web-resource-collection>
		<auth-constraint>
			<role-name>myuserrole</role-name>
		</auth-constraint>
	</security-constraint>
	<login-config>
		<auth-method>BASIC</auth-method>
		<realm-name>FILE</realm-name>
	<!-- 	<form-login-config>
			<form-login-page>/login.jsp</form-login-page>
			<form-error-page>/error.jsp</form-error-page>
		</form-login-config> -->
	</login-config>
</web-app>

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i added role and username and password to tomcat-users.xml as below

<?xml version="1.0" encoding="UTF-8"?>
<!--
  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
  the License.  You may obtain a copy of the 

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0
I got below error
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
i checked below which has tomcat 8 already.

Project → Properties → Target Runtimes → *Apache Tomcat worked for me. There is no Target Runtimes under Facets (I'm on Eclipse v4.4 (Luna)).

i just has to remove and add again to  resolve this error.

i wonder why i have to remove and re add to resolve. this does not make sense to me. please advise
0
hi,

I am trying below example

http://briansjavablog.blogspot.com/2012/09/spring-jms-tutorial-with-activemq.html

i fired 100 messages as decribed in tutorial and exepcted them to be consumed with message on console.

Intead i am gettign below error


SEVERE: Could not refresh JMS Connection for destination 'jmsReceiveJndi' - retrying using FixedBackOff{interval=5000, currentAttempts=21, maxAttempts=unlimited}. Cause: Cannot send, channel has already failed: tcp://127.0.0.1:8161

under meta-inf context.xml is as below

<?xml version="1.0" encoding="UTF-8"?>
<Context>

   <!--
               Active MQ Connection Factory manages pooled connections
               to the ActiveMQ broker. Tomcat will connect with the
               broker using a TCP connection on port 61616 - this is the
               default port for ActiveMQ
   -->
   <Resource name="jms/mqConnectionFactory"
                     auth="Container"
                     type="org.apache.activemq.ActiveMQConnectionFactory"
                     description="JMS Connection Factory"
               factory="org.apache.activemq.jndi.JNDIReferenceFactory"
               brokerURL="tcp://localhost:8161" />

   <!--
               This is a reference to the first Queue we defined
               earlier in the ActiveMQ admin console
   -->
   <Resource name="jms/testQueueOne"
                     auth="Container"
                     type="org.apache.activemq.command.ActiveMQQueue"
               factory="org.apache.activemq.jndi.JNDIReferenceFactory"
               physicalName="TestQueueOne"/>

   <!--
               This is a reference to …
0
while trying below example

i did all stepas given
http://www.javanbeyond.com/activemq/tomcat-spring-activemq/

when i execute i do not see 3 mesages there

Example Execution:

Start ActiveMQ and login as admin/admin and click on “Queues” tab.
Start Tomcat and deploy the application. You should see three listeners listening to “firstQueue”.

what is difference between
 tcp://127.x.y.z:8161
 tcp://localhost:8161
 http://localhost:8161

which one i have to use.

my active mq running on my own windows laptop locally?
when to use http wen to use ftp?
when to use local host when to use ip like number 127.x.y.z...
please advise
0
hi,

I am looking for good sample example on below area
JMS API Durable subscriber example
can you please point me to some end to end example on this using active mq.

Please advise
0
hi,

can i open two instances of eclipse mars both pointing to same tomcat 8 pointing ?
is that is ok or do i get any error like port conflict or something else?
please advise
0
hi,

within eclipse i have tomcat 8 running. I want to know what location that tomcat running from on my local windows laptop C drive as i happened to have many tomcats in my c drive under different directories
0
hi am geting this error after running the antivirus am not even able to start my pc in safe mode mode am in window 10 The application was unable to start correctly 0xc0000005 am in window 10
0
Hi,
i am working on below example
https://howtodoinjava.com/jms/jms-publish-subscribe-message-example/

i wrote my publisher as below

package pubSub;    
 
import javax.naming.Context;
import javax.naming.InitialContext;                                                                          
import javax.jms.Topic;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.TopicPublisher;

import java.util.Properties;

import javax.jms.DeliveryMode;
import javax.jms.TopicSession;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
                                                                            
public class Publisher
{
    public static void main(String[] args) throws Exception
    {
    	// Obtain a JNDI connection
    	Properties env = new Properties();
    	env.put(Context.INITIAL_CONTEXT_FACTORY,“org.apache.activemq.jndi.ActiveMQInitialContextFactory”);
    	env.put(Context.PROVIDER_URL, “http://localhost:8161”);
    	//env.put(Context.SECURITY_PRINCIPAL, “weblogic”);
    	//env.put(Context.SECURITY_CREDENTIALS, “weblogic”);

    	InitialContext ctx = new InitialContext(env);
       // get the initial context
       InitialContext ctx = new InitialContext();
                                                                           
       // lookup the topic object
       Topic topic = (Topic) ctx.lookup("topic/topic0");
                                                                           
       // 

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0
hi,
my project has different environment related property files like int, sT, PT, Prod etc to call various service (like email service, validate service etc)

using maven build command from command prompt or eclipse how to pass environment like integraion for example


pom.xml has filter entry i heard which does check like this
any good links, examples on this
please advise
0
Hi Experts

Could you explain how was the mainframes programs strategy to deal with low hardware resouces, decades ago, when developing banking applications like checking accounts, legal accounting, etc. a typical area with huge amount of data.

I guess there was one computer designated to treat each big agency data and then one other only to sumarize. Am I right?
Could you give details, mainly if you lived this situation?

Thanks in advance!
0
hi,

I have configured eclipse with tomcat 8

i modified my tomcat-users.xml by doing cntr+shift+R and searching on tomcat-users.xml

i added below entry as i am getting tomcat username and password screen when i run rest web services 139 query parameter example from annotation
when i give tomcat , tomcat getting anauthorized error


<tomcat-users>
  <user name="admin" password="admin" roles="admin-gui,manager-gui" />
</tomcat-users>


after addin above when i restart getting below
eror
Could not load the Tomcat server configuration at /Servers/Tomcat v8.0 Server at localhost-config. The configuration may be corrupt or incomplete



How to solve:

Close Eclipse
Copy all files from TOMCAT_7_HOME/conf to WORKSPACE_FOLDER/Servers/Tomcat v7.0 Server at localhost-config
Start Eclipse
Expand the Servers project, click on the Tomcat 7 project and hit F5
Start Tomcat from Eclipse

to folow above steps how to where is my tomcat conf directory or where the tomcat directory is ?
is there is a way in eclipse you can see properties etc to find it?
how to know my server is tomcat 8 or tomcat 8.5 etc

how to solve this error
please advise
0
Hi,
How to resolve this?

18c.png
0
Hi,

I am reading about nested loop here
http://study.com/academy/lesson/nested-for-loops-in-java.html

for (int i = 1; i <= 5; i++) {
 for (int j = 1; j <= i; j++) {
 }
}


Think of a nested loop as a race track within a race track. When you begin each lap on the main oval, you veer into another track inside the original (the nested track/loop). You may go around any number of times within the smaller track before looping around the main one. Then it starts over again until you've done the required number of laps on the main track. In all, you may go around a thousand times, or many more!



what it means by race track within a race track not able to visualize this image or picture
what it means by each lap on main oval and veer to another track inside original track??

please advise
0
hi,
 let us say i give some random number like 81349 on console i should see output as by ascending order of each digit in each line how to achieve that as well

     1
    3 3
   4 4 4
 8 8 8 8
9 9 9 9 9

how to to achive this
please advise
0
Hi,

i am going through below link

http://www.summa.com/blog/2009/05/19/top-10-not-so-popular-eclipse-shortcuts

eclipse what is difference between control1 and control 2 when to use which one?

please advise
0
I just bought a golf cart  that has a pro link monitor. Is it possible to reprogram for the gps when the golf course doesn't have the system. I basically just want the gps.
0

System Programming

40K

Solutions

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.