Home » Author Archives: Adrianos Dadis

Author Archives: Adrianos Dadis

Adrianos Dadis
Adrianos is working as senior software engineer in telcos business domain. Particularly interested in enterprise integration, multi-tier architecture and middleware services. He mainly works with Weblogic, JBoss, Java EE, Spring, Drools, Oracle SOA Suite and various ESBs.

Storm event processor – GC log file per worker

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In the last three months, I am working with a new team building a product for Big Data analytics on Telecom domain. Storm event processor is one of the main frameworks we use and it is really great. You can read more details on its official documentation (which has been improved). Storm uses Workers to do your job, where each ...

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Set WildFly binding address and shutdown using CLI

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It’s very easy to bind WildFly on a hostname/IP just using command line parameters. I have a simple GNU/Linux box that I use it to play with various things, one of them is WildFly. I start WildFly listening on a specific IP using this commands:             $> cd /opt/wildfly/wildfly-8.0.0.Beta1/bin $> ./standalone.sh -c standalone-full.xml -b=192.168.1.10 -bmanagement=192.168.1.10 ...

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Add Apache Camel and Spring as jboss modules in WildFly

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These days I am playing with Wildfly and Apache Camel and Spring. A simple way to communicate between EARs / WARs is using direct-vm component of Camel. There are many ways to achieve this with or without Camel. Camel works like a charm in WildFly without any need for extra configurations. Camel is great!!! In order to avoid pack all ...

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Java heap space, native heap and memory problems

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Recently, I was discussing with a friend, why the Java process uses more memory than the maximum heap that we set when starting the java process. All java objects that code creates are created inside Java heap space, which its size is defined by the -Xmx option. But a java process is consisted by many spaces, not only by the ...

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Invaluable books for an enterprise software engineer

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I am again in the design phase of a very large project. The project context is to provide a new solution for the core services and core integration infrastructure around the prepaid platform on the largest telecommunication organisation in Greece. This is the most intrinsic motivation for me, define the essential architecture, spot the tricky points of requirements and provide ...

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Version control branching strategies

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Almost two years ago we started a new project (related to SOA/BPM infrastructure) on a large telco organization. Project is going very well and run on production since last summer. We develop more and more modules and things going well. Now it’s time to transfer the knowledge to client’s developers. The main things that we have to taught them are ...

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Java Thread at RUNNABLE state is not really running

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Recently, I was doing an analysis/tuning on a Java application server installation in order to identify the bottlenecks and fix them. The most common action in such procedure (tuning) is to retrieve many Thread dumps, when system is on load. Please have in mind that heavy load (for some cases) may have side effects that they may lead us to ...

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JRockit – JRCMD useful commands

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I have been using JRockit since many years 2007. I find it slower than Hotspot, but it has been always better on diagnosis and analysis of problems. Since last summer, I have been working for an international telecommunication systems vendor. We design and implement various products for telecom operators, on top of HP OpenCall Convergent Communication Platform. I am fan ...

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Setup Git server with read/write HTTPS on Debian

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Three months ago we decided to move our projects to Git. I guess you already know the advantages of Git over Subversion, as there are too many discussions for this subject. I will describe here a fast and minimal configuration of how to turn a Debian GNU/Linux box to a Git server that supports read and write actions via HTTP(S). ...

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Beneficial CountDownLatch and tricky java deadlock

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Have you ever used java.util.concurrent.CountDownLatch? It’s a very convenience class to achieve synchronization between two or more threads, where allows one or more threads to wait until a set of operations being performed in other threads completes (check javadoc and this post). CountDownLatch can save your time in suitable cases and you have to be aware of this class. As ...

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