rest webservice response problem when returning list

[Suzzane Pinto]

hi...
i am trying to create restful webservice jaxrs to retrieve multiple images as base64 string from database and give response to android httpclient
i can succesfuly retrieve the base 64 strings..but while response iam getting exception
my resource file is

@GET
    @Path("/getimage")

    @Produces({MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.WILDCARD})
    @Consumes({MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.WILDCARD})
    public Response getImage()
        
  {
 
        //String imaged = personParams.getFirst(IMAGE);
       
 
        //System.out.println("Storing posted " + imaged);
        //decodedBytes = Base64.decode(imaged.getBytes());
     //decodedBytes = Base64.decode(imaged.getBytes());    
        //ByteArrayInputStream bais = new ByteArrayInputStream(decodedBytes);
        //System.out.println("byte array" + decodedBytes);
        try   
        {  
     	   
           Class.forName("com.mysql.jdbc.Driver");
           String url="jdbc:mysql://**.**.**.**/mylogin";
           String username="***";
           String password="****";
        
         Connection  connection = DriverManager.getConnection(
         		url,username,password);
                 
         System.out.println("connected");        
        //String query = "insert into master(username,address,myimage) values(?,?,?)";
         String query = "SELECT myimage FROM master where username='sanjana'";
         Statement st = connection.createStatement();
         ResultSet rs = st.executeQuery(query);
        
       // int i=0;
         while (rs.next())
        {
         	 imm=rs.getString("myimage");
         	
         	 list.add(imm);
         	                        
        } 
       
         System.out.println("the image retrieved is"+list);  
        

  
     
     
        }     
        catch (Exception e)   
        {     
           System.out.println(e.getMessage());    
        } 
       
 
 
        
        return Response.ok(list).build();
 
    }

whiler giving response it gives error as follows

Mar 20, 2012 11:39:39 AM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: A message body writer for Java class java.util.ArrayList, and Java type class java.util.ArrayList, and MIME media type image/gif was not found
Mar 20, 2012 11:39:39 AM com.sun.jersey.spi.container.ContainerResponse write
SEVERE: The registered message body writers compatible with the MIME media type are:
image/* ->
  com.sun.jersey.core.impl.provider.entity.RenderedImageProvider
*/* ->
  com.sun.jersey.core.impl.provider.entity.FormProvider
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
  com.sun.jersey.core.impl.provider.entity.FileProvider
  com.sun.jersey.core.impl.provider.entity.InputStreamProvider
  com.sun.jersey.core.impl.provider.entity.DataSourceProvider
  com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
  com.sun.jersey.core.impl.provider.entity.DocumentProvider
  com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider
  com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider
  com.sun.jersey.server.impl.template.ViewableMessageBodyWriter
  com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy

Mar 20, 2012 11:39:39 AM com.sun.jersey.spi.container.ContainerResponse logException
SEVERE: Mapped exception to response: 500 (Internal Server Error)
javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.ArrayList, and Java type class java.util.ArrayList, and MIME media type image/gif was not found
	at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285)
	at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1451)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363)
	at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353)
	at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
	at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class java.util.ArrayList, and Java type class java.util.ArrayList, and MIME media type image/gif was not found
	... 20 more

iam new to rest webservice..any help or suggestion would be greatly appreciated...i need to get the response as the same list to which i have added the base64 images.

thanks in advance.

[William Brogden]

If you want to return base64 Strings why this annotation?

 @Produces({MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.WILDCARD}) 

Bill

[Suzzane Pinto]

ok i got it....thankyou
but nw im facing problem while returning a list of base64 strings.my code is

@GET
    @Path("/getimage")
   
  
    @Consumes({MediaType.APPLICATION_XML, MediaType.TEXT_XML, MediaType.WILDCARD})
    public Response  getImage()
        
  {
    	
        

        //String imaged = personParams.getFirst(IMAGE);
       
 
        //System.out.println("Storing posted " + imaged);
        //decodedBytes = Base64.decode(imaged.getBytes());
     //decodedBytes = Base64.decode(imaged.getBytes());    
        //ByteArrayInputStream bais = new ByteArrayInputStream(decodedBytes);
        //System.out.println("byte array" + decodedBytes);
        try   
        {  
     	   
           Class.forName("com.mysql.jdbc.Driver");
           String url="jdbc:mysql://******/mylogin";
           String username="***";
           String password="****";
        
         Connection  connection = DriverManager.getConnection(
         		url,username,password);
                 
         System.out.println("connected");        
        //String query = "insert into master(username,address,myimage) values(?,?,?)";
         String query = "SELECT * FROM master where username='xyz'";
         Statement st = connection.createStatement();
         ResultSet rs = st.executeQuery(query);
        
       // int i=0;
         while (rs.next())
        {
         	 imm=rs.getString("myimage");
         	 i=rs.getInt(1);
         
         
         	//decodedBytes = Base64.decode(imm.getBytes());
         
         	ImageRetrieve im=new ImageRetrieve(imm);
         	list.add(im);
         	System.out.println("the image in string"+i);
         	
         	                            
        } 
         
     	System.out.println("the image in string"+list);
    	
     //System.out.println("the image in byte[]"+list1);
  
        }     
        catch (Exception e)   
        {     
           System.out.println(e.getMessage());    
        } 
        
        
        
       
       
        GenericEntity entity = new GenericEntity<List<ImageRetrieve>>(list) {};
        return Response.ok(entity).build();
  
 
      
        
 
    }

i want to return a list of base64 strings to android client is my approach correct of adding in list..?
please suggest..