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Investigating the HashDoS issue

Nearly one month ago I have written some thoughts on how the HashDoS problem presented at the 28C3 or other code defects could perhaps be fixed temporarily without interaction of vendors. Now it’s time to deeper investigate the complexity attack and have at look at the sources. I quitely assume that java.util.HashMap and java.util.Hashtable are the most common used data ...

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State Does Not Belong In The Code

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What is “state” in your web application? It’s the data that gets stored (regardless of the destination – memory, database, file-system). The application itself must not store any state in the code. This means your classes should only have fields with objects that are also stateless. In other words – you should not store anything in your services, DAOs or ...

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Spring Thread Pool Services

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Thread Pools are very important to execute synchronous & asynchronous processes. This article shows how to develop and monitor Thread Pool Services by using Spring. Creating Thread Pool has been explained via two alternative methods. Used Technologies : JDK 1.6.0_21 Spring 3.0.5 Maven 3.0.2 STEP 1 : CREATE MAVEN PROJECT A maven project is created as below. (It can be ...

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Tomcat & IntelliJ – Deploy war files outside webapps folder

At present I am working on developing an Android application that needs to be supported by a slew of REST services hosted in the cloud. I chose Google App Engine based on its support for Java, Groovy and most importantly Spring. I developed a Spring MVC based REST application and used ContentNegotiatingViewResolver to negotiate content based on request URL extensions. ...

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Google Appengine Staging Server Howto

Out of the box, Google’s App Engine supports versioned deployments. You can switch back and forth between revisions very easily, which is a great feature for properly testing an application before going live. There is one major problem: All versions of the application share the same datastore. So if you’re migrating your data you run a serious risk of influencing ...

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Spring MVC – Flash Attributes

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Latest Spring Framework incarnation (3.1) brought interesting feature called Flash Attributes. It is remedy for the problem mentioned a long time ago, in one of my posts: Spring MVC – Session Attributes handling. This problem can be described in few words: if we want to pass the attributes via redirect between two controllers, we cannot use request attributes (they will ...

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Set up a Java EE 6 development environment

This tutorial explains in short how to set-up a typical environment to develop Java EE 6 based applications. There is no prerequesite to this tutorial other then a working Windows XP client with sufficient CPU power and memory. During the tutorial we will need to install the following components: Java 6 JDK Update 26 Eclipse IDE for Java EE Developers ...

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Implementing Active Record Pattern with Spring AOP

During class design we should take decisions about the assignment of responsibilities that will have every class. If we have chosen well, systems tend to be easier to understand, maintain and extend. Almost all of our projects have a persistence layer, either relational database, document stores, or simply XML files. And typically you will use DAO pattern to implement abstract ...

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