BeanItemContainer equivalent in vaadin 14

Allan16 · September 4, 2019, 12:36pm

I am upgrading an old system from an earlier version of vaadin to vaadin 14. In the previous version, I used BeanItemContainer with Beans to populate a grid and export reports to Jasper Reports based on the filtered input.

What is the current replacement for BeanItemContainer in the current version?

BeanItemContainer<SampleBean> sample_container=new BeanItemContainer<SampleBean>(SampleBean.class);
	for(int i=0; i<rows; i++)
		{
						 SampleBean data=new SampleBean();
							data.setName("Allan") //bean fields setters and getters
							data.setEmail("allan@vaadin.com") //bean fields setters and getters
	    }
						 sample_container.add(data) //add the bean to the container
						 
						 //then set the container as the datasource for the grid

ollit.1 · September 4, 2019, 2:16pm

You can use a java.util.ArrayList<SampleBean>.

    List<SampleBean> sample_container=new ArrayList<SampleBean>();
	for(int i=0; i<rows; i++)
		{
						 SampleBean data=new SampleBean();
							data.setName("Allan") //bean fields setters and getters
							data.setEmail("allan@vaadin.com") //bean fields setters and getters
						 sample_container.add(data) //add the bean to the container
		}

    Grid<SampleBean> grid = new Grid<>(SampleBean.class);
    grid.setItems(sample_container);

Aviprash · October 16, 2020, 3:05pm

Example:

final List<Customer> lister = new ArrayList<>();
	grid3.setColumns("safdc", "as", "fas", "asdf",
                   "asf", "awef", "asf", "aasdf");
	grid3.setItems(lister);

This resulting in invalid json error on Vaadin!
Grid or table cannot add more than 10 rows!

Any solution for this?

ollit.1 · October 19, 2020, 7:00am

If you’re calling grid.setColumns with String parameters,
a) You need to use the Grid constructor that uses a Bean class parameter. In your case, it must be constructed with Grid<Customer> grid3 = new Grid<>(Customer.class) instead of new Grid<>().
b) The parameter values need to match the Property names in your Bean class. In your case Customer should have methods like getSafdc(), getAs(), getFas() and so on.

Aviprash · October 19, 2020, 8:28am

Olli tietavainen Thank you for the reply.

public static final Grid<Customer> grid3 = new Grid<>(Customer.class);
	
	final List<Customer> lister = new ArrayList<>();
	grid3.setColumns("safdc", "as", "fas", "asdf",
                   "asf", "awef", "asf", "aasdf");
	grid3.setItems(lister);
	
	getSafdc(), getAs(), getFas()

It was the same as you said… i get the same error INVALID JSON and some random repeated code of grid items.

ollit.1 · October 19, 2020, 11:01am

You should reduce that to a minimal reproducible example - it’s not easy to say anything about that code as it is.

ollit.1 · October 19, 2020, 11:50am

That’s not what I meant by a minimal reproducible example. StackOverflow has some guidelines here: https://stackoverflow.com/help/minimal-reproducible-example
This page is also a good read: http://sscce.org/

Your example code contains things that are not necessary (anything related to REST access, authentication, etc.) and it’s missing important relevant pieces (the Customer class).

Aviprash · October 19, 2020, 12:26pm

import javax.validation.constraints.*;
public class Customer implements Cloneable{

	    private String parmCompanyID;
	    
	    private String parmName;
	    
	    private String parmAddress;
	    
	    private String parmCustomerAccount;
	    
	    private String parmEmail;
	    
	    private String parmLanguage;
   
	    public Customer() {}

	    public Customer(String parmCompanyID, String parmName, String parmAddress,
	    		String parmCustomerAccount, String parmEmail, String parmLanguage) {
      super();
    
      this.parmCompanyID = parmCompanyID;
      this.parmName = parmName;
      this.parmAddress = parmAddress;
      this.parmCustomerAccount = parmCustomerAccount;
      this.parmEmail = parmEmail;
      this.parmLanguage = parmLanguage;
  }

	    public String getParmCompanyID() {
	        return parmCompanyID;
	    }

	    public void setParmCompanyID(String parmCompanyID) {
	        this.parmCompanyID = parmCompanyID;
	    }

	    public String getParmName() {
	        return parmName;
	    }

	    public void setParmName(String parmName) {
	        this.parmName = parmName;
	    }
	    
	    public String getParmAddress() {
	        return parmAddress;
	    }

	    public void setParmAddress(String parmAddress) {
	        this.parmAddress = parmAddress;
	    }
	    
	    public String getParmCustomerAccount() {
	        return parmCustomerAccount;
	    }

	    public void setParmCustomerAccount(String parmCustomerAccount) {
	        this.parmCustomerAccount = parmCustomerAccount;
	    }
	    
	  
	    public String getParmEmail() {
	        return parmEmail;
	    }
	
	    public void setParmEmail(String parmEmail) {
	        this.parmEmail = parmEmail;
	    }
	    
	    public String getParmLanguage() {
	        return parmLanguage;
	    }

	    public void setParmLanguage(String parmLanguage) {
	        this.parmLanguage = parmLanguage;
	    }	  
}

public class CustomerAccount extends VerticalLayout {
	
		final List<Customer> lister = new ArrayList<>();
		public static final Grid<Customer> grid3 = new Grid<>(Customer.class);
		 
    public CustomerAccount() {   
       getRes("**some string**");   
	        grid3.setColumns("parmCustomerAccount", "parmName", "parmAddress", "parmCompanyID",
                   "parmEmail", "parmLanguage", "parmCustomerAccount1", "emailid1");  
	        add(grid3);
  }
    public void getRes(String cid)   
	{
    	 HibernateUtil.truncate();
         String wsURL = "http://aedfwfwfwefsome link .svc?wsdl";        
         URL url = null;
         URLConnection connection = null;
         HttpURLConnection httpConn = null;
         String responseString = null;
         String outputString="";
         OutputStream out = null;
         InputStreamReader isr = null;
         BufferedReader in = null;
         String user = "***";
 		String password = "*******";
 		String authString = user + ":" + password;
 		System.out.println("auth string: " + authString);
 		byte[] authEncBytes = Base64.getEncoder().encode(authString.getBytes());
 		String authStringEnc = new String(authEncBytes);
 		System.out.println("Base64 encoded auth string: " + authStringEnc);	    
		
         String xmlInput =";yukjnfxergedgdbdb some xml 
                  </soapenv:Body> </soapenv:Envelope>aedhbrfthrh";
         try
         {	
         	if(wsURL.contains(" "))
         		wsURL = wsURL.replace(" ", "%20");
             url = new URL(wsURL);
             connection = url.openConnection();
             httpConn = (HttpURLConnection) connection;
             httpConn.setRequestProperty("Authorization", "Basic " + authStringEnc);
  
             byte[] buffer = new byte[xmlInput.length()]
;
             buffer = xmlInput.getBytes();
  
             String SOAPAction = "http://tempuri.org/GEICustomerService/getCustomer";
          
             httpConn.setRequestProperty("Content-Length", String
                      .valueOf(buffer.length));
             
             httpConn.setRequestProperty("Content-Type",
                     "text/xml; charset=utf-8");
                           
             httpConn.setRequestProperty("SOAPAction", SOAPAction);
             
             httpConn.setRequestMethod("POST");
             
             httpConn.setDoOutput(true);
             
             httpConn.setDoInput(true);
             
             out = httpConn.getOutputStream();
             out.write(buffer);
             out.close(); 
              
             // Read the customer details response
             isr = new InputStreamReader(httpConn.getInputStream());
             in = new BufferedReader(isr);
              
             while ((responseString = in.readLine()) != null) 
             {
                 outputString = outputString + responseString;
             }
          
             DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
             DocumentBuilder db = dbf.newDocumentBuilder();
              InputSource is = new InputSource(new StringReader(outputString));
              
              Document document = db.parse(is);
			  
           NodeList nodeLst = document.getElementsByTagName("b:GEICustomerDataContract");
           NodeList parmAddress1 = document.getElementsByTagName("b:parmAddress");
           NodeList parmAddress2 = document.getElementsByTagName("b:parmCompanyID");
           NodeList parmAddress3 = document.getElementsByTagName("b:parmCustomerAccount");
           NodeList parmAddress4 = document.getElementsByTagName("b:parmEmail");
           NodeList parmAddress5 = document.getElementsByTagName("b:parmLanguage");
           NodeList parmAddress6 = document.getElementsByTagName("b:parmName");
  
         	for (nodenum1 = 0; nodenum1 < 20; nodenum1++){
                     	  
           String webServiceResponse = nodeLst.item(nodenum1).getTextContent();
           String webServiceResponse1 = parmAddress3.item(nodenum1).getTextContent();
           String webServiceResponse2 = parmAddress6.item(nodenum1).getTextContent();
           String webServiceResponse3 = parmAddress1.item(nodenum1).getTextContent();
           String webServiceResponse4 = parmAddress2.item(nodenum1).getTextContent();
           String webServiceResponse5 = parmAddress4.item(nodenum1).getTextContent();
           String webServiceResponse6 = parmAddress5.item(nodenum1).getTextContent();                          
           
          lister.add(new Customer(webServiceResponse4, webServiceResponse2, webServiceResponse3, 
        		  webServiceResponse1, webServiceResponse5, webServiceResponse6));   

         }
         System.out.println(l1);  
       
      grid1.setItems(lister);
         
          } 
         catch (Exception e)         
         {
             e.printStackTrace();
         }
    }
}

for (nodenum1 = 0; nodenum1 < 10; nodenum1++) It WORKS fine for 10 rows in grid and if it is for (nodenum1 = 0; nodenum1 < 20; nodenum1++) doesnt work and shows invalid json!!

ollit.1 · October 19, 2020, 12:35pm

I’m sorry to be so pedantic about this, but that’s still not a reproducible code example (and it’s not minimal, either).