How to change default port number in my eclipse

MyEclipse -> Windows->Preferences, Follow below screenshot

Multi threading example using Java

Multi Threading example in java

It is very common requirement to implement multi threading in large scale applications to improve the throughput of response,

Below screenshot demonstrates how to crate a thread, and process the given List of values

Below java class demonstrates, how to perform multi threading.

How to use VarArgs in Java

Variable Arguments(Varargs) :  varargs allows a method to accept zero or more arguments, No need to specify how many number of arguments will be passed to a method.

Syntax : access_specifier return_type method_name(data_type... variable_name){}

Below example demonstrate two methods with varargs.

Hello World Application using Struts 2.1

- Create a Java Project & Add Struts Capabilities to the project.

- Develop index.jsp as shown below, Ensure form action value will be used in struts.xml

- Ensure web.xml should be as shown below

- Define welcome.jsp with whatever you want to display.

- Develop a Customer.java POJO class as shown below, Ensure this should have a method called execute() , Struts framework will invoke execute() method internally.. This method can return any string value based on functional requirement.

- Modify struts.xml as shown below
  - Configure action element as shown below
  -  Add as many result elements as you want based on execute() method return values.. If execute() method returns "success" , "failure" depends on two conditions, then define two result elements as shown below.

- Run this application , Right click on project, Run As ->MyEclipse Server Application

- By default, it will launch index.jsp

- By clicking on 'Submit' button , this will invoke form action and navigate to based on execute() method return value.

Hello World Example With Spring Framework

- Create a Java Project in My Eclipse, Add 'Spring3.1' Capabilities, By right clicking on Project->MyEclipse->Project Facets(Capabilities)->Spriing Facet
This will load required libraries in the class path.

- Create a Customer POJO as shown below, with  one parameterized constructor and to data members

- Update applicationContext.xml as shown below by configuring the bean details.

- Write a simple Test class as shown below, Right click on this class and run as java application

- You should see below output by running above class

Deployment issue while deploying from Jdeveloper to Weblogic Console : Deployer:149140

Deployment issue while deploying from Jdeveloper to Weblogic Console : Deployer:149140


If you encounter below deployment issue while deploying from Jdev to Weblogic console,

Ensure you activated the changes in weblogic console.

[12:03:14 PM] [Deployer:149140]The task cannot be processed further until the current edit session is activated. When this occurs, task processing will continue. The user can exit the deployer tool without affecting the task.

How to Convert org.apache.myfaces.trinidad.model.UploadedFile to java.io.File

Convert org.apache.myfaces.trinidad.model.UploadedFile to java.io.File

// assume that you have the UploadedFile object named uploadFile

InputStreamReader reader = new InputStreamReader(uploadFile.getInputStream());

int partition = 1024;

int position = 0;

int length = 0;

char[] buffer = new char[partition];

FileWriter fstream = new FileWriter("test.tmp");

do{

    length = reader.read(buffer, position, partition)

    fstream.write(buffer, position, length);

}while(length > 0);

File file = new File("test.tmp");

    /**
     * Read the attached file content as a byte[] and convert to Datahandler
     * @param valueChangeEvent
     */
    public void onFileUpload(ValueChangeEvent valueChangeEvent) {
        String methodName = "onFileUpload(ValueChangeEvent)";
        _logger.entering(CLAZZ_NAME, methodName);
        try {
            UploadedFile file = (UploadedFile)valueChangeEvent.getNewValue();
            byte[] byteArray=org.apache.commons.io.IOUtils.toByteArray(file.getInputStream());
            DataHandler dataHandler = new DataHandler(byteArray,"application/octet-stream");

        } catch (Exception b64de) {
            _logger.logp(Level.SEVERE, CLAZZ_NAME, methodName,
                         " Exception Occured", b64de);

            b64de.printStackTrace();
        }
        _logger.exiting(CLAZZ_NAME, methodName);
    }