Jul 212014
 
 Posted by on July 21, 2014 at 6:22 pm Application Servers, Java App Servers, Oracle/BEA WebLogic Tagged with: , ,  No Responses »

While doing load testing on application hosted in weblogic server with OHS as front end we saw after sometime of load test we use to see frequent “Failure of server Apache Bridge” errors from OHS when we checked in the ohs access logs we saw entries like below

127.0.0.1 – - [21/Jul/2014:08:08:16 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:08:48 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:09:20 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:09:52 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:10:24 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:10:56 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:11:28 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:12:00 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:12:32 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:13:04 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:13:36 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:14:08 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:14:40 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:15:12 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:15:44 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:16:16 -0500] “HEAD /index.html HTTP/1.1″ 503 -
127.0.0.1 – - [21/Jul/2014:08:16:48 -0500] “HEAD /index.html HTTP/1.1″ 503 -

 
Continue reading “Frequent Failure of server Apache Bridge Error in OHS | Weblogic” »

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Jul 082014
 
 Posted by on July 8, 2014 at 7:07 pm FAQ, Java, JVM Tuning, Must Know's, Performance Tagged with: , , ,  No Responses »

The highest level divisions of the JVM memory are the most well known areas, such as heap and non heap. The heap area is used to store the objects instantiated from the classes, which means when an object is created from the constructor of the class it is allocated in heap memory.

Heap memory

The heap memory is subdivided into three areas as follows:
The Eden generation: This area is also known as the new generation. It is the area of memory used to, as its name already states, create new objects, except very ones. This area is constantly swept by a type of GC, the GC minor, which eliminates the short-lived objects that are the majority of the objects created. To scale this particular area of the heap memory, it is necessary to use the -XX:NewSize and -XX:MaxNewSize parameters. Continue reading “Understanding Heap And Non Heap Memory In HotSpot JDK” »

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Jul 082014
 
 Posted by on July 8, 2014 at 6:29 pm Application Servers, Java App Servers, Jboss Tagged with: , , ,  No Responses »

WildFly has several configuration options and ways to deploy applications. For both administrators and developers, the CLI and management console offer several options. Here we have used the standalone mode of wildfly for the same. Here we will discuss about two types of deployment techniques

 

  1. Standalone mode
  2. Domain mode

 

Standalone mode:

Deploying Through CLI

Installation of applications using the CLI provides advantages of owning a single command-line interface that allows us to run installation scripts for specific scenarios. You can manage the status of the deployment of a single server or all servers that make up the domain.
Continue reading “Steps To Deploy WAR file to Jboss WildFly using CLI and Management Console” »

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Jul 072014
 
 Posted by on July 7, 2014 at 6:16 am Application Servers, FAQ, Java App Servers, Jboss Tagged with: ,  No Responses »

As we know Wildfly formerly known as JBoss AS is now making waves in new rising servers with awesome features and functionalities. Recently Wildfly team has released the brand new wildfly 8.1.0 Final version packed with lots of features and enhancements. You can download the latest wildfly versions from link here.

Before jumping into the deep we shall know the basic structure of wildfly and its functionalities and files used for what to have a good grasp on the new server. So here we will discuss about the directory structure and their functionalities and configuration files used.

Below is the sample structure of Wildfly 8.1.0.CR1

JBoss Wildfly folder structure

JBoss Wildfly folder structure


Continue reading “JBoss Wildfly Directory structure, configuration files and their functions explained” »

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Jun 292014
 

Apache has released its latest tomcat 8 with Java 7 support which include this enhancements as mentioned in Tomcat 8 change logs.

Below are few key changes from Tomcat 7.x to Tomcat 8.x

- Apache Tomcat 8.0.x requires Java 7 or later. Apache Tomcat 7.0.x required Java 6.

- Apache Tomcat 8 supports the Java Servlet 3.1, JavaServer Pages 2.3, Java Unified Expression Language 3.0 and Java WebSocket 1.0 specifications.

- Servlet 3.1 API

- The default HTTP and AJP connector implementation has switched from the Java blocking IO implementation (BIO) to the Java non-blocking IO implementation (NIO)

- The Aliases, VirtualLoader, VirtualDirContext, JAR resources and external repositories features that all provided a way to add resources to a web application have been replaced with a single framework rather than each being implemented separately.

- Tomcat 8 embeds a packaged renamed version of Commons DBCP 2.x. There are a number of notable changes between Commons DBCP 1.x and Commons DBCP 2.x

- When starting Tomcat with the jpda option to enable remote debugging, Tomcat 8 listens on localhost:8000 by default. Earlier versions listened on *:8000.
Continue reading “How to install Tomcat 8 from ZIP file in Windows 7” »

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Jun 292014
 
 Posted by on June 29, 2014 at 11:25 am bash, Shell Scripting, Tutorials Tagged with: ,  No Responses »

Shell scripting can be leveraged to accomplish very critical tasks. If you are a administrator then in your day to day tasks you can use small shell scripts to automate few of your daily tasks and save time and energy. Here we had a requirement of reading a log file entries for error messages from a perticular time to time as we wanted to check for any new error entries in log file.

 
Continue reading “Shell Script to retrieve only recently added records from a file” »

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Jun 282014
 
 Posted by on June 28, 2014 at 4:15 pm Database, MS SQL Server Tagged with: , , , ,  No Responses »

You can install all the SQL Server 2012 services by following the installation wizards launched from the Installation Center. Some of the services and features that can be installed using Installation Center include Database Services, Integration Services (SSIS), Analysis Services (SSAS), Reporting Services (SSRS), Master Data Services (MDS), and Data Quality Services (DQS). Additionally, management and development tools such as SQL Server Management Studio (SSMS) and SQL Server Data Tools (formerly BIDS) can be installed through Installation Center. Additional settings and configurations may be necessary after the core installation process completes.
Continue reading “Steps to Install SQL Server Using GUI, Command line and Powershell” »

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