Loading properties file in java

You just have to define Properties variable and then use load method. Load method gets InputStream as a parameter.

Properties properties = new Properties();
properties.load(is);

Linux console tools for measuring performance

We can use following tools:

• top, htop - processes measurement
• df - storage space info
• hdparm - storage performance
• cat /proc/cpuinfo - CPU info
• cat /proc/meminfo - RAM info
• vmstat, dstat - processes, memory, swap, IO, CPU info
• netstat - network info
• mpstat - CPU summary
• iostat - IO info
• iptraf - many metrics

Latency and Responsiveness

These two measurements are important in Web Development.

• Latency - a measure of time delay experienced in a system
• Responsiveness - ability of a functional unit to complete assigned tasks within a given time

Runing ChromeDriver on Linux

I decided to use WebDriver in my project. It is a next version of Selenium library used for tests. I am using Ubuntu system. In my pom.xml I needed only to add one dependency:

<dependency>
  <groupId>org.seleniumhq.selenium</groupId>
  <artifactId>selenium-java</artifactId>
  <version>2.5.0</version>
</dependency>

I have created a simple java code in my main method:

 WebDriver driver = new ChromeDriver();
 driver.get("http://google.pl");
 driver.findElement(By.name("q")).sendKeys("Selenium");
 driver.findElement(By.name("q")).submit();

My program did not manage to connect to Chrome web browser. I needed to download chromedriver from http://code.google.com/p/chromium/downloads/list and add a system property webdriver.chrome.driver with path to this file.

It did work!

CXF - maven plug-in

I was implementing a Webservice client. I used Apache CXF (http://cxf.apache.org/) an open source services framework. It is a natural successor of Axis library.

After some time spent with CFX I can say that it uses Collections over Arrays (that is a big plus). On the other hand it hasn't got as good documentation as I expected. I tried to use maven task for generating java classes from WSDL definition files. When I got an error I had to use wsdl2java from command line to get detailed error message. Also I couldn't find syntax for wsdl2java task. I wished to use more parameters. I spent some time on finding how to do it. Underneath you can see an example to define configuration in pom.xml for wsdl2java operation. You can use more wsdlOption tags for generating classes from more then one WSDL file.

<build>
  <plugins>
   <plugin>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-codegen-plugin</artifactId>
    <version>${cxf.version}</version>
    <executions>
     <execution>
      <id>generate-sources</id>
      <phase>generate-sources</phase>
      <configuration>
       <sourceRoot>${project.build.directory}/generated/cxf</sourceRoot>
       <wsdlOptions>
        <wsdlOption>
         <wsdl>${basedir}/src/main/wsdl/authentication-service.wsdl</wsdl>
         <extraargs>
          <extraarg>-client</extraarg>
          <extraarg>-p</extraarg>
          <extraarg>http://www.alfresco.org/ws/service/authentication/1.0=org.alfresco.ws.service.authentication</extraarg>
         </extraargs>
        </wsdlOption>
       </wsdlOptions>
      </configuration>
      <goals>
       <goal>wsdl2java</goal>
      </goals>
     </execution>
    </executions>
   </plugin>
  </plugins>
 </build>

EJB 3.0 - good summary

Just look here: http://www.oracle.com/technetwork/articles/entarch/ejb-33-094592.html

Java Decompiler for Eclipse - JD-Eclipse

JD-Eclipse is the best Eclipse decompiler I have used.
Here are instructions how to install it:
http://java.decompiler.free.fr/?q=jdeclipse