Tech Trek: A Software Engineer's Guide to Code and Beyond

chkconfig command is used to setup, view, or change services that are configured to start automatically during the system startup. chkconfig has five distinct functions: adding new services for management, removing services from management, listing the current startup information for services, changing the startup information for services, and checking the startup state of a particular service. chkconfig --list [ name ] chkconfig --add name chkconfig --del name chkconfig [ --level levels ] name < on | off | reset > chkconfig [ --level levels ] name   OPTIONS --level levels Specifies the run levels an operation should pertain to. It is given as a string of numbers from 0 to 7. For example, --level 35 specifies runlevels 3 and 5. --add name This option adds a new service for management by chkconfig . --del name The service is removed from chkconfig management. --list name This option lists all of the services which chkconfig...

Jetty : Jetty is an open source servlet container, which means it serves Java-based web content such as servlets and JSPs. Jetty is written in Java and its API is available as a set of JARs. Developers can instantiate a Jetty container as an object, instantly adding network and web connectivity to a stand-alone Java app. Jetty has a slogan, "Don't deploy your application in Jetty, deploy Jetty in your application." What this means is that as an alternative to bundling your application as a standard WAR to be deployed in Jetty, Jetty is designed to be a software component that can be instantiated and used in a Java program just like any POJO . Put another way, running Jetty in embedded mode means putting an HTTP module into your application, rather than putting your application into an HTTP server.  To embed a Jetty server, the following steps are typical: Create the server Add/Configure Connectors Add/Configure Handlers Add/Configure...

To find out jetty thread pool size programmatically : ThreadPool tp = (ThreadPool) server.getThreadPool(); if(tp instanceof QueuedThreadPool) { QueuedThreadPool qtp = (QueuedThreadPool) tp; int minThreads = qtp.getMinThreads(); int maxThreads = qtp.getMaxThreads(); LOG.info("minThreads : " + minThreads + "\t maxThreads :" + maxThreads) }

package com.demo.memoryheap; import java.lang.management.ManagementFactory; /**  * @author abdul  *  */ public class FreeMemoryUsingMxBean {     /**      * @param args      */     public static void main(String[] args) {         com.sun.management.OperatingSystemMXBean mxbean = (com.sun.management.OperatingSystemMXBean) ManagementFactory.getOperatingSystemMXBean();                 System.out.println("Total Memory in MB: " + mxbean.getTotalPhysicalMemorySize()/(1024*1024));                 System.out.println("Free Memory in MB: " + mxbean.getFreePhysicalMemorySize()/(1024*1024));     } } Note : If you get access restriction error while working on Eclipse , check this : Access Restriction issue

Its work for me : Go to the Build Path settings in the project properties. Remove the JRE System Library Add it back; Select "Add Library" and select the JRE System Library. The default worked for me

/**  *  */ package convert.stream.to.string; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; /**  * @author abdul  *  */ public class StreamToString {     /**      * @param args      */     public static void main(String[] args) {         StreamToString streamToString = new StreamToString();               //intilize an InputStream         InputStream is = new ByteArrayInputStream("file content:\nData1\nData2".getBytes());               /*          * Call the method to convert the stream to string          */  ...

[root@localhost ]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 5.2 (Tikanga) For others: Slackware: /etc/slackware-version Mandrake: /etc/mandrake-release Red Hat: /etc/redhat-release Fedora: /etc/fedora-release