Spring Boot Different ways to start an application
Spring Boot - Different ways to start an application
Posts by Year
2020
Tracing PWA new content refresh event
I was using this wrapper around PWA(Progress Web Apps) APIs register-service-worker and was wondering how does it detect when there is a new build and the pa...
2019
2018
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Back to Top ↑2016
Re read inputstream in java
Sometimes in java you get an inputstream, you need to process it the first time to process the data then you need it again to output the contents. To do thi...
Set the base url for jsp
Sometimes when you’re working on jsp pages and you need to set a base url for all pages, and this value needs to be available for use, then use the followin...
How to install gradle and use gradle for jenkins
If you use jenkins and you have a project that uses gradle, how do you create a task that builds the project and deploy the artifact to tomcat? For this exa...
How to generate certificate for apache2
If you need to setup ssl (‘https’) connections to your apache2 webserver then use the following steps. sudo mkdir /etc/apache2/ssl sudo openssl req -x509...
How to add gcm messaging to your app
If you tried the gcm playground and it does not work then try gcm quickstart tutorial. git clone https://github.com/googlesamples/google-services.git You ...
Basic Maven Commands Part 3
use jetty to run program To use the Jetty Plugin just add the following in your pom.xml: <project> ... <build> <plugins> &l...
Adding search to your blog
How to add search to blog goto www.google.com/cse google custom search engine add your website do verification, put google html onto your website, c...
Basic Maven Commands Part 2
Here are some basic maven commands for setting up your project: JavaWebapp mvn archetype:generate -DarchetypeArtifactId=maven-archetype-webapp -DgroupId=co...
Installing libav on Ubuntu 14.04 Trusty
Requirement: Got a video that was encoded using HEVC, couldn’t play it on my device so have to convert it to mpeg4. The tool ffmpeg was replaced in previous...
Java 6 7 8 features
Java SE 6 Support for web services JSR 224 - Java API for XML-Based Web Services (JAX-WS) 2.0 Support for scripting languages JSR 223 - Scripting for the J...
Java Template pattern
The Template pattern formalizes the idea of defining an algorithm in a class, but leaving some of the details to be implemented in subclasses. Reasons for ...
Java Observer pattern
Observer pattern - one subject many observers, state changes in the subject must be notified to all observers. Observers first register with the subject, on...
Java Encapsulation Inheritance Polymorphism
What is encapsulation? Encapsulation can be used to hide implementation details but it can also be used to separate your application into logical parts. Fin...
Java Overriding vs Overloading
Method overloading, is when method with same name co-exists in same class but they must have different method signature. Method overloading is done via ...
Java String StringBuffer StringBuilder
String is immutable StringBuffer and StringBuilder is mutable StringBuffer is synchronized thread safe. StringBuilder is not thread safe but operation is fa...
Basic Maven Commands
maven commands to run program mvn exec:java -Dexec.mainClass="com.example.Main" maven commands to run program with args mvn exec:java -Dexec.mainClass="c...
Key changes in Java 8
Here are some new features inside Java 8 Lambda expressions - provides the ability to pass code as data to methods ... public static void main(String[] a...
How to build owncloud android version
To build owncloud android you need a JDK and the Android SDK Start the SDK Manager and make sure to install the API 19 and API 23 platform and the SDK Buil...
Move custom owncloud installation to repository
Been using custom installation of ownCloud since it first came out. But now see that they have Ubuntu repos installation option so moving custom installatio...
Create project site for github repo
If you want to create github project sites follow the instructions as Github Pages. Create your project repository. Add files to repository Push cha...
AngularJS project to call RESTful service part 2
Using ang-starter to create sample AngularJS app. The structure is easily understandable and is using a later version of angular. Modified the js/Controlle...
Add comments and analytics to github blog
After investigating different comment system Comment System Comparison decided to use Disqus. To use apply for account then setup website, use the website ...
AngularJS project to call RESTful service
Trying to modify an angularjs dashboard app angular-material-dashboard to use the RESTful ContactService. This is a node.js program so requirements are: N...
Change github blog to jekyll bootstrap
Trying out Jekyll Bootstrap because it contains comments, categories and other utilities such as analytics. Came across some problems with this plugin, it ...
Using Spring Framework Inside Google App Engine
Trying to port spring project to run on google app engine came across some stumbling blocks. The following is a list of things that didn’t worked and one tha...
Spring Framework ViewResolver
My spring project needed to have two access points http://localhost:8080/springwebapp/ and http://localhost:8080/springwebapp/contact/jsonlist.json one for w...
Openshift project
In order to support my android project I needed a backend. Chose openshift because it is free, have login capabilities and can run jboss. First go through th...
Android studio - Android project
Starting an android project to call some webservices. Using android studio 2.0. Android studio will install the android sdk for you but if you have already a...
Github does not support pygments
If you are blogging using github and are using syntax highlighting then watch out for this. Github does not support pygments anymore. You will get this emai...
Blogger to Jekyll
I wanted to see if it was possible to import blogger posts into github blog. Found this tool that makes it simple to do so: jekyll-import Instructions: i...
Intrusion Detection Software for ubuntu 12.04
This post is a guide on how to install ‘snort’ and Intrusion Detection Software for ubuntu 12.04.Install snort: sudo apt-get install snortMak...
2015
Jekyll Syntax Highlighting Example Part 2
The page.title is included in the layout template. To check out how to do syntax highlighting see the source for this file RAW. This is an example of synta...
Jekyll Syntax Highlighting Example Part 1
The page.title is included in the layout template. This is an example of syntax highlighting. Github does not support rouge so have to change to Pygments. ...
2014
Code formatter for blogspot
Three solutions1. Use online code formatter http://codeformatter.blogspot.tw/ copy code to there translate then copy the results into code formatter.2. Use j...
2013
Maven dependency management
Maven dependency management Scenario: jar file from repository not in the format you want. <pre style="background-color: #eeeeee; border: 1px dashed rgb(1...
2012
Good websites open source java
infoqredbooksstackoverfloww3schoolshttp://java-source.net/
2011
Spring webservices part 2 jax-ws example
This is a simple example of webservices using jax-ws spring component.It is a contact application that allows you to store your addresses.The webservice retr...
Spring webservices example part 1
This is a blog on how I implemented webservices using the spring framework.In part 1 we setup a simple spring web application. A simple contactapplication wh...
Constant Improvement
Must have constant improvement.Go over each topic.Create examples for each topic.Doesn’t matter if it takes time, that is what improvement means.
2010
Batch programming getting the date
How to get the date in bat? Windows XP.for /f “tokens=1-4 delims=/ “ %%a in (‘date /t’) do (set year=%%a& set month=%%b& set day=%%c& set weekd...
2009
How to move files in itunes
change directory in preferencesgoto file -> consolidate library to move files
How to link wireless to nas
How to link wireless to nas?What are the different ways to connect wireless router to nas securely?use vpn? or just configure passwords?Things done:setup web...
The things a company must have’s
Must have:basic encryption and decryption algorithms utils available for company to use.study md5, des and encryption providers.
Bad way of doing things
Things NOT to do:how not to do thingsdon’t just do, confirm the requirements in writing before implementing.reduce the risk of customers saying i didn’t ask ...
Java toolkit
If you want to use the image manipulation toolkit included with the JDK.when using this in eclipse:Image image = Toolkit.getDefaultToolkit().getImage(“tray.g...
Hide show zip files in windows xp explorer
Tool tip for windowsHide: ‘regsvr32 /u zipfldr.dll’Show again: ‘regsvr32 zipfldr.dll’
Setting up netbeans 6.7.1
<ul><li>install jdk 1.6.0_13</li><li>install netbeans 6.7.1 with java web capabilities and install glassfish to /sun/AppServer</li...
What is web 2.0
web 1.0 people just put their static information on the webweb 1.5 some interactivity mainly online shoppingweb 2.0 is all about interactivity and communicat...
OOP composition vs inheritance
favour composition over inheritance. even though you have common code in the base class and child classes uses those methods it is better to move those com...
Apache httpd configuration
Alias /pds /packaging/sun/pds <directory packaging="" pds="" sun=""> Options Indexes Order allow,deny Allow from all </directory> Make changes ...
Java checksum data inputstream / data outputstream
Hi All I am looking for a java package that will help me in checking a stream of data.This will be used on the network and will probably do the checking on ...
Java pattern matching
case insensitive search for a string Properties properties = System.getProperties(); properties.list(System.out); String osname = (String)pr...
Unix solaris commands
Use prstat to see the Processes and CPU loadUse vmstat 2 2 to indicate the free memoryUse iostat to see internal disksUse netstat to see network infoUse mpst...
The Template Method
use template method when you need a base class to contain a certain behaviour with some base algorithms while having the subclasses implement those other b...
Patterns delegation
use delegation when you need an object to contain behaviour of two other objects containing the same methods.some object pretending to be another object but...
Patterns abstract factory
use abstract factory if you need platform independence, for example if you have an api that creates buttons and you need to modify the library so that you ...
Apache virtualhost mod_proxy example
How to setup a virtualhost in Apache for example same ip apache 80 port -> tomcat 8080 port (use reverse proxy) apache 19080 port -> tomcat 9080 port(...
Jboss mdb example
This is an example on writing a Message Driven Bean in JBossif you decide to use jboss as your application servercomponents usedjboss-4.0.5.GAeclipse 3.2xdo...
Programming struts redirect howto
struts redirect howto different web contextswebappA sendredirect to webappBString url = response.encodeRedirectURL(“urlwithparameters”);System.out.println(“...
Tomcat sharing data across different contexts
for tomcatadd crossContext=”true” to server.xml for the web applications context:<pre><Context docBase=”C:/eclipse/workspace/WebAppA/WebContent” p...
Apache httpd reverse proxy howto
apache httpd reverse proxy settings howtoLoadModule proxy_module modules/mod_proxy.soLoadModule proxy_ajp_module modules/mod_proxy_ajp.soLoadModule proxy_ba...
Programming struts tags usage
struts tags usageusing arraylist and mapsdefine in your action<pre>List urlName = new ArrayList();for (Iterator i = st.iterator(); i.hasNext();) {Str...
Tooltips eclipse change java project to dynamic web project
close projectopen .project fileadd<nature>org.eclipse.wst.common.project.facet.core.nature</nature>open projectright click project -> proper...
Programming servlets saving objects to application scope
saving to application scoperequest.getSession().getServletContext().setAttribute(“applicationmap”, map);retrieving from application scopeMap smap = (Map)r...
Programming form base ldap authentication and authorization
using tomcat to connect to ldapedit server.xml<Realm className=”org.apache.catalina.realm.JNDIRealm”debug=”99”connectionName=”cn=root”connectionPassword=...
Programming java form base authentication
add security-constraint, login-config, security-role into web.xml<security-constraint> <display-name>securityconstraint</display-name...
Programming hibernate annotations example
Hibernate annotations - hibernate without the mapping filesnote: you must use jdk1.5, hibernate 3.2 core and annotationscreate hibernate.cfg.xml<pre st...
Struts invalidate session
Create a struts action - LogoutAction.java<pre style="font-family:arial;font-size:12px;border:1px dashed #CCCCCC;width:99%;height:auto;overflow:auto;back...
Environment setup
Must have a environment setup so that the company can run right.Must have a file server where commonly used files can be stored eg. slide templates.This ca...
Rules for Cleaning logs
Clearing logs or file purging should be done at the systems level and not at the programming or applications level because cleaning logs or deleting files ...
LDAP getting the previous dn
public static String getPreviousDN(String dn) { String retString = null; try { DirContext DirCtx = DriverLocator.getInstance().get...
Recommendations good IT podcasts
http://www.itconversations.com/