Java: Import AWS RDS certificate

June 22, 2021 Leave a comment

To establish secure connection between Java application and AWS MySQL RDS instance the ssl/tls certificate needs to be imported in to JVM.

Step #1: Find Java home

Using the following commands you can find the Java home directory

whereis java
ls -l /etc/alternatives/java

Step #2: backup existing cacerts file for future reference

cp $JAVA_HOME/jre/lib/security/cacerrts $JAVA_HOME/jre/lib/security/cacerrts.original

Here are the steps to import RDS certificate into JVM

wget https://s3.amazonaws.com/rds-downloads/rds-ca-2019-root.pem
openssl x509 -outform der -in rds-ca-2019-root.pem -out rds-ca-2019-root.der
keytool -import -alias rds-root -keystore $JAVA_HOME/jre/lib/security/cacerrts -file rds-ca-2019-root.der
wget https://s3.amazonaws.com/rds-downloads/rds-ca-2019-us-west-2.pem
openssl x509 -outform der -in rds-ca-2019-us-west-2.pem -out rds-ca-2019-us-west-2.der
keytool -import -alias rds-intermediate -keystore $JAVA_HOME/jre/lib/security/cacerts -file rds-ca-2019-us-west-2.der

Step #3: Update JDBC url in your Java application

Here is the sample JDBC url with SSL enabled

jdbc:mysql://aws.rds.com/dname?useUnicode=true&characterEncoding=UTF8&verifyServerCertificate=true&useSSL=true&requireSSL=true

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Java vs. JavaScript coding

March 13, 2010 30 Comments

In today’s web programming many Java developers write JavaScript coding hence they tend to follow Java best practice and coding style in JavaScript as well. But there is huge amount of difference in both the coding style and best practices.

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There is no language yet available to replace Java!

January 7, 2010 8 Comments

There is a perception created in the software development industry that Java is out-dated and Ruby, Python, Scala, etc. are going to take over Java’s position. Some “hyper-enthusiasts” are already left Java platform. Sun’s profit model collapse, Applet, Jini, EJB and JSF heavyweight framework failures added fuel to these campaigns. I still believe no language yet available in the market to replace Java. I don’t have to talk why Java is better because it is proven solution for more than a decade but I would like to talk about how false campaigns are created by “hyper-enthusiasts”. It is easy to fall into these false campaigns because as a developer we want new challenges and something new to learn. Read more of this post

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Wicket in OC4J / OracleAS

November 22, 2009 Leave a comment

Recently I tried deploying wicket framework based web application in OC4J container it didn’t work, whereas the same code works well in Tomcat. While googling found a few solution which recommends to use wicket servlet configuration instead of servlet filter to resolve the issue. I did the same but no luck. Then I tried associating a bookmarkable page for the homepage then it works well. Here is the code snippet: Read more of this post

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JRebel – a productive tool for Java developers

November 15, 2009 Leave a comment

Java Rebel – a very useful productive tool
One of my friend told me about JavaRebel. Later I tried with eclipse it worked well. The installation and setups are very simple and easy. It saves a lot of time for enterprise class projects. Now you don’t have to restart Tomcat for each changes. Try out today, enjoy the productivity.
Reference:
http://www.zeroturnaround.com
http://www.zeroturnaround.com/blog/configuring-ide-debugging-with-javarebel/
http://www.zeroturnaround.com/update-site/

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Java – Object XML Mapping

November 11, 2009 4 Comments

Have you written 1000s of buggie lines of code to parse XML? Generating an XML is easy but when it comes to XML parsing/import it is hard. We have to think about many scenarios and deal with many combinations. I use to prefer XPath API for XML import because I can fetch required values as they way/order I want rather than iterating all nodes in DOM structure. XPath is better than DOM coding but is not the best solution. So I started looking for a solution similar to Hibernate for XML to Object translation. Read more of this post

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Single-Sign-On (SSO) in Java Platform using Active Directory

August 29, 2009 76 Comments

Sorry guys it been long time writing in my blog.

Nowadays single-sign-on became a hot selling feature for all desktop and web-based products. In this article I talk about single-sign-on implementation in Java platform with Active Directory server. Since Microsoft Windows has become one of the most common corporate network platforms it is worth integrating with your product. Starting from Windows 2000 Microsoft supports Kerberos protocol. It is unusal that Microsoft support open-standard protocol, but they do in this case; good for us :-) Read more of this post

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GWT an innovative framework

May 19, 2009 1 Comment

After the birth of Struts “framework” became hot buzz word in the software development industry. Now almost all languages, technologies and methodologies have tons of frameworks. Recently I was trying to figure out what is latest in the market and what are the different frameworks are available. Read more of this post

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Handling currency calculations in Java business application

March 29, 2009 8 Comments

Recently I saw a weird floating issue in Java application which made our currency calculation wrong. Can you guess what would be the output of the below code?

System.out.println(38.0 - 26.6);

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Java – Thread’s stack trace dump

March 22, 2009 2 Comments

Recently I was dealing with a deadlock issue. Usually I use eclipse break points to create deadlock situation at the same time find the line/code which causes the deadlock. But this one is bit complex scenario where it is not easy to have break points move line by line to reproduce the deadlock. Read more of this post

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A JSP code to debug class loader issues

March 15, 2009 Leave a comment

Class Loader is one of the complex concept/design to understand in Java programming. On the initial days working with Tomcat and Desktop application there is not much class loading issues. From EJB days class loading became complex by specification and implementation. Seems JavaEE 5 tries to simplify the class loading specification but I don’t know much about that. Read more of this post

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Is UML dead? & What is the future of UML?

March 9, 2009 8 Comments

Once upon a time UML is a hot buzz word in software development industry. If you know what is aggregation, abbreviation, etc. you will get job easily as an architect. Tools like Rational Rose are costly only a few company had that tools. Read more of this post

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Is design pattern teaches how to design an application?

March 8, 2009 Leave a comment

Many of them think that if a person knows design pattern (the theory), he/she can design an application; due to this misunderstanding many stupid questions been asked in interviews about design pattern in a meaningless way. Read more of this post

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JEXL – A simple expression evaluation engine

February 15, 2009 4 Comments

When I was developing a framework looking for a solution very similar to eval() function in JavaScript. Initially I thought of Velocity but somehow I wasn’t convinced with that approach. (Struts2 uses Velocity to externalize the HTML generation to make it customizable). Later I wrote my own parser to evaluate an expression that returns a Boolean value. Recently I found an open source which exactly meets my requirement. I don’t have to talk much about this open source you can find lot more information in their website. I thought it might be useful to others as well.
Reference: http://commons.apache.org/jexl/

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JDBC performance tuning with optimal fetch size

February 1, 2009 36 Comments

Tuning performance using fetch size is an old technique some of you might already be using this configuration; some may know about it but may not have implemented. Recently I have implemented in my current project, would like to share my experience. In a typical production environment database and application will be running on different physical server. Even if you have high-end server class machine the network traffic between application and database server is one of the key factor of your application performance. Read more of this post

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