Patterns in java imageio API

Hello,
Can somebody help me in figuring out 'Patterns' used in creating the javax.imageio API. By patterns I mean the Gang of Four Patterns like singleton, Decorator, Chain of responsibility....
Please tell me if you know of any pattern used in this API.
Thanks a lot for your help,
Ganesh

Dennis,
I am creating a list of patterns used by the imageio API. Yes, this is indeed an assignment. I am not proficient in patterns. Any help in pointing the existing patterns will help me.
Thanks,
Ganesh

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DAO pattern and Java Persistence API

Hi
This is a question for anyone who might be familiar with the standard DAO design pattern and the Java Persistence API (JPA - part of EJB3). I'm new to this technology, so apologies for any terminology aberrations.
I am developing the overall architecture for an enterprise system. I intend to use the DAO pattern as the conceptual basis for all data access - this data will reside in a number of forms (e.g. RDBMS, flat file). In the specific case of the RDBMS, I intend to use JPA. My understanding of JPA is that it does/can support the DAO concept, but I'm struggling to get my head around how the two ideas (can be made to) relate to each other.
For example, the DAO pattern is all about how business objects, data access objects, data transfer objects, data sources, etc relate to each other; JPA is all about entities and persistence units/contexts relate to each other. Further, JPA uses ORM, which is not a DAO concept.
So, to summarise - can DAO and JPA work together and if so how?
Thanks
P.S. Please let me know if you think this topic would be more visible in another forum (e.g. EJB).

Thanks, duffymo, that makes sense. However ... having read through numerous threads in which you voice your opinion of the DAO World According to Sun, I'd be interested to know your thoughts on the following ...
Basically, I'm in the process of proposing an enterprise system architecture, which will use DAO as the primary persistence abstraction, and DAO + JPA in the particular case of persistence to a RDBMS. In doing so, I'd like to illustrate the various elements of the DAO pattern, a la the standard class diagram that relates BusinessObject / DataAccessObject / DataSource / TransferObject (http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html). With reference to this model, I know that you have a view on the concept of TransferObject (aka ValueObject?) - how would you depict the DAO pattern in its most generic form? Or is the concept of a generic DAO pattern compromised by the specific implementation that is used (in this case JPA)?

Java logging API (1.4) -- where's the file?

Where on God's green earth does the log file get written to?
I am doing some very simple code:
import java.util.logging.*;
public class SimpleLogging {
   static Logger jcfeLog = Logger.getLogger("test1");
   static Logger sampleLog = Logger.getLogger("test2");
   public static void main(String [] args)
      jcfeLog.warning("sample warning");
      sampleLog.log(Level.INFO, "sample info entry");
      byte[] moreInfo = new byte[10];
      //fill moreInfo with some binary info
      jcfeLog.log(Level.FINEST, "Some obscure event", new Object[]{moreInfo});
} doesn't get much simpler, plus I am using the default properties file. I get the console output but simply cannot find the log file anywhere on my system. Just for kicks, here is the config entry for the file:
java.util.logging.FileHandler.pattern =%t/java%u.logmy understanding is that it should go to the temp directory?
also, why aren't the specs for the config file listed anywhere, all these %t, %u, etc.....????

The FileHandler API gives the meaning for the % symbols.
http://java.sun.com/j2se/1.4/docs/api/java/util/logging/FileHandler.html
Your pattern indicates that the file should be put in the system's temp directory, with the file name java###.log.
Maybe you should try calling the addHandler method on your Loggers, and add a FileHandler to write the messages to that file.

Java mail api - sending mails to gmail account

Hello
I am using java mail api to send mails.when i send mails to gmail from ids which are not in gmail friends list, most of the mails are going to spam.Ofcourse, some of them go to inbox.I tried in lot of ways to analyse the problem.But nothing could help. Can anyone plzz tell me how to avoid mails going to spam in gmail, using java mail api?
Thank you in advance,
Regards,
Aradhana
Message was edited by:
Aradhana

am using the below code.
Properties props = System.getProperties();
//          Setup mail server
          props.put("mail.smtp.host", smtpHost);
          props.put("mail.smtp.port","25");
          props.put("mail.smtp.auth", isAuth);
     Authenticator auth = new UserAuthenticator();
//          Get session
          Session s = Session.getDefaultInstance(props,auth);
//          Define message
          Message m = new MimeMessage(s);
//          setting message attributes
          try {
               m.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
               InternetAddress f_addr=new InternetAddress(from);
               f_addr.setPersonal(personalName);
               m.setFrom(f_addr);
               m.setSubject(subject);
               m.setSentDate(new Date());
               m.setContent(msg,"text/plain");
               m.saveChanges();
//               send message
               Transport.send(m);
Message was edited by:
Aradhana

Performance issue with Business Objects Java JRC API in CRXI R2 version

A report is developed using java JRC API in CR XI release 2. When I generate the report in the designer, it took less than 5 seconds to display the results in crystal report viewer inside the designer. But in the QA environment, when I generate the same report from the application, it takes almost 1 to 1.5 minutes to display the same results in PDF. I also noticed that if the dataset contains bigger volume of data, then the reports are taking even longer almost 15 to 20 minutes.
While generating the report from the application, I noticed that most of time is taken during the execution of the com.crystaldecisions.report.web.viewer.ReportExportControl Object method as shown in following line of code
exportControl.processHttpRequest(request, response, context, null)
We thought the delay in exporting the report to PDF might be the layout of the report and data conversion to PDF for such a bigger volume of data.
Then we investigated the issue and experimented quickly to generate the same report with same result set data from the application using XML, XSL and converted the output XSL-FO to PDF using Apache FOP (Formatting Objects Processor) implementation. The time taken to export the report to PDF is less than 6 seconds. By doing this experiment, it is proved that the issue is not with conversion of data to PDF but it is the performance problem with Business Objects Java JRC API in CR XI R2.
In this regard, I searched for the above issue in the SAP community Network Forums -> Crystal Reports and Xcelsius -> Java Development -> Crystal Reports. But I did not find any answers or solutions for this kind of issue in the forums.
Any suggestion, hint in this matter is very much appreciated.

Ted, The setReportAppServer problem is resolved. Now I could able to generate the report with hardcoded values in the SQLs in just 6 seconds where as the same report was generated in CRXI R2 in 1 minute 15 seconds as mentioned in the earlier message.
But, our exisiting application passes the parameter values to the SQLs embedded in the report. For some reason the parameters are not being passed to the report and the report displays only the labels without data.
As per the crj 12 samples codes, the code is written as shown below.
1. Created ReportClient Document
2. SetReportAppServer
3. Open the report
4. Getting DatabaseController and switching the database connection at runtime
5. Then setting the parameters as detailed below
ParameteFields parameterFieldController = reportClientDoc.getDataDefController().getParameterFieldController();
parameterFieldController.setCurrentValue("", "paramname",paramvalue);
parameterFieldController.setCurrentValue("", "paramname",paramavalue);
byteArrayInputStream = (ByteArrayInputStream)reportClientDoc.getPrintOutputController().export(ReportExportFormat.PDF);
6. Streaming the report to the browser
Why the parematers are not being passed to the report? Do I need to follow the order of setting these parameters? Did I miss any line of code for setting Params using crj 12?
Any help in this regard would be greatly appreciated.

How can i access gmail's smtp server using java mail api

i m using java mail api to access gmails pop and smtp service to receive and send mail from ur gmail account. I m able to access gmails pop server using the ssl and port 995 , but i can not use its smtp server to which i m connecting using ssl on 465 port. It requires authentication code.
if anybody can help me in this regard i m thnkful to him/her.
thnks in advance.
jogin desai

Here's an example of using SSL + Authentication
http://onesearch.sun.com/search/onesearch/index.jsp?qt=ssl+authentication&subCat=siteforumid%3Ajava43&site=dev&dftab=siteforumid%3Ajava43&chooseCat=javaall&col=developer-forums

How to print a document in reverse order using Java Print API ?

I need to print a document in reverse order using Java Print API (*Reverse Order Printing*)
Does Java Print API supports reverse order printing ?
Thnks.,

deepak_c3 wrote:
Thanks for the info.,
where should the page number n-1-i be returned ?
Which method implementation of Pageable interface should return the page number ?w.r.t. your first question: don't return that number but return page n-1-i when page i is requested; your document will be printed in reverse order. Your class should implement the entire interface and wrap the original Pageable. (for that number n your class can consult the wrapped interface; read the API for the Pageable interface).
kind regards,
Jos

Error while sending mail when using Java Mail API

Hi Experts,
I am trying to execute a webdynpro application which uses the Java Mail API to send emails. The exception that I get on executing the application is :
Sending failed; nested exception is: javax.mail.SendFailedException: Invalid Addresses; nested exception is: javax.mail.SendFailedException: 550 5.7.1 Unable to relay for [email protected]
Can anybody please help me sort out the issue.
Regards
Abdullah

Hi,
Usually one get this error if the SMTP server is configured not to relay mails (a security measure) or the SMTP server need the mail to be sent from a trusted IP or with proper authentication. Some SMTP servers are configured to block junk mails.
Pls check with your mail server administrator.
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Save Attachment from exchange server 2010 from oracle using java mail API

Hello,
I want to read email from microsoft exchangeserver 2010 and save attachement into a folder.I created an Java program to import attachments from a exchange server mailbox using "POP3S".It works fine when run as a java application.But when i put this inside Oracle11g R2 using load java and while executing from a procedure it gives an error at parsing message into Multipart
Error at line : Multipart mp = (Multipart)m.getContent();
Error:
Content-Type: multipart/mixed;
boundary="_002_A0C2E09A..................................."
java.lang.ClassCastException
at mailPop3.checkmail(mailPop3:71)
My Java Class is as follows,
import java.io.*;
import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;
import java.util.Date;
The function i used to check for attachments is given below.
public static boolean hasAttachments(Message m) throws java.io.IOException, MessagingException
Boolean hasAttachments = false;
try
// if it is a plain/html text - no attachements
if (m.isMimeType("text/*"))
return hasAttachments;
else if (m.isMimeType("multipart/alternative"))
return hasAttachments;
else if (m.isMimeType("multipart/*"))
Multipart mp = (Multipart)m.getContent();
if (mp.getCount() > 1)
hasAttachments = true;
return hasAttachments;
catch (Exception e) {
e.printStackTrace();
} finally {
return hasAttachments;
My Java Details as follows
java Version :1.5.0_10
java.vm.specification.version:1.0
java.vm.version :1.5.0_01
java.specification.version:1.5
java.class.version:48.0
Java mail API:javamail-1.4.4
Used Jars:mail.jar
Could someone explain why I am getting this error? What can I do to resolve this error?
Is any other Jar need other than mail.jar?
Any help would be much appreciated.
Regards,
Nisanth

Hai EJP,
Thanks for your reply,
My full java class as follows,
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.Part;
import javax.mail.Multipart;
import javax.mail.internet.MimeMultipart;
import javax.mail.internet.MimeMessage;
public class Newmail
public Newmail()
super();
public static int mailPOP3(String phost,
String pusername,
String ppassword)
Folder inbox =null;
Store store =null;
int result = 1;
try
String host=phost;
final String username=pusername;
final String password=ppassword;
System.out.println("Authenticator");
Authenticator auth=new Authenticator()
protected PasswordAuthentication getPasswordAuthentication()
return new PasswordAuthentication(username, password);
System.out.println("Certificate");
String filename="D:\\Certi\\jssecacerts";
String password2 = "changeit";
System.setProperty("javax.net.ssl.trustStore",filename);
System.setProperty("javax.net.ssl.trustStorePassword",password2);
Properties props = System.getProperties();
System.out.println("host-----"+props);
props.setProperty("mail.pop3s.port", "993");
props.setProperty("mail.pop3s.starttls.enable","true");
props.setProperty("mail.pop3s.ssl.trust", "*");
Session session = Session.getInstance(props,auth);
session.setDebug(true);
store = session.getStore("pop3s");
System.out.println("store------"+store);
store.connect(host,username,password);
System.out.println("Connected...");
inbox = store.getDefaultFolder().getFolder("INBOX");
inbox.open(Folder.READ_ONLY);
Message[] msgs = inbox.getMessages();
System.out.println("msgs.length-----"+msgs.length);
result = 0;
int no_of_messages = msgs.length;
for ( int i=0; i < no_of_messages; i++)
System.out.println("msgs.count-----"+i);
System.out.println("Attachment....>"+msgs.getContentType());
Multipart mp = (Multipart)msgs[i].getContent();
System.out.println("Casting Success" + mp.getContentType());
catch(Exception e)
e.printStackTrace();
finally
try
if(inbox!=null)
inbox.close(false);
if(store!=null)
store.close();
return result;
catch(Exception e)
e.printStackTrace();
return result;
Please check it
Regards,
Nisanth

Java Persistence API and creation of databases

Hi All
I have designed a small address book application which uses a database to store the information. I have used the new Java Persistence API to take care of my transactions and querrys with the database. This works great for one set database which is generated the first time the application runs and is used all the time.
However I would like to make it so that the user can create a new address book (database) with a different name, I am not sure how I would do this using the Java Persistence API. I know the persistence.xml file must be placed in the META-INF directory of the source, so how would I be able manipulate the file or could I place the file somewhere else.
David

I am using the Derby database. I can create a database by passing the create command when I create the entity Manager like so:
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<property name="toplink.jdbc.url" value="jdbc:derby:AddressBook"/>I wonder if I can progamatically set this value so that I have a default database in the persistence.xml and others can then create there own.
David

Read Attachments using Java Mapping API

Hello,
after investigating the Java Mapping API a little deeper I found some very interesting Interfaces "InputAttachments" and "Attachments" which could do exactly what is required:
Reading attachments and convert them into base64 code.
As I am not an experienced Java Programmer howeve, I am note sure how to use those interfaces.
For example there is a method defined in interface "InputAttachments":
Attachment getAttachment(String contentID)
How do I use it? If I use it in a way like "InputAttachments.getAttachment("abc");" then I get the error that it is not a static method. However how do I instantiate "InputAttachments".? As it is an interface I am not sure how to do this.
Any idea how to handle these methods?

Hi,
I am working on the similar. I am able to attach txt files and csv files but have trouble attaching xcel and pdf's. Any input is appreciated. Thanks

(Java Base API / JNI ) in tomcat

Hi All,
(this is a question I asked on the 'C-API' forum but I got no answer. I hope I'll have more success here )
I'm trying to access a database built with the C-API from a tomcat/glassfish server using the Java native API. (I need to read data produced with the C API)
I put the Environment in the application context so all user will share the same instance of the database.
first question: is it a good idea ? What would be the best practice ? can I safely use this application in a multithreaded environment ?
The problem was that the 'System.loadLibrary' method is called each time my application is re-deployed: so an exception was thrown !! (library already loaded) because the server has already loaded the db library in a previous deployment. To solve the problem I put a silent 'try... catch...' around this System.loadLibrary in the source code of com/sleepycat/db/internal/db_javaJNI.java
2nd question: is there a way to avoid this hack ?
Thank you for any answer
Pierre

The JE team does not know the answer to your question, but will see if we can find redirect it to someone who might know.

Issue with JAVA Mail API

Hi
We have a requirement to create a custom e mail. For the same I am trying to use Java Mail API.I am facing an issue with the following code:
session session1 = session.getInstance(properties, null);
System gives an error Sourced file: inline evaluation of: ``Properties props = new Properties(); session session1 = session.getInstance(prop . . . '' : Typed variable declaration : Class: session not found in namespace
Is there some specific API i need to import for session class. Kindly suggest.
Regards
Shobha

Hi Shobha,
I was also facing the same issue from last couple of weeks and just now i have achieved the working functionality.
Please find below working code and replace values as per your serveru2019s configuration.
import com.sap.odp.api.util.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
import java.io.File;
import java.net.*;
// SUBSTITUTE YOUR EMAIL ADDRESSES HERE!!!
String to =<email address>;
String from =<email address>;
// SUBSTITUTE YOUR ISP'S MAIL SERVER HERE!!!
String host = <smtp host name>;
String user = <smtp user name>;
// Create properties, get Session
// Properties props = new Properties();
Properties props = System.getProperties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.host", host);
props.put("mail.debug", "false");
props.put("mail.smtp.auth", "false");
props.put("mail.user",user);
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Message msg = new MimeMessage(d_session);
msg.setFrom(new InternetAddress(from));
InternetAddress[] address = {new InternetAddress(to)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject("Test E-Mail through Java");
msg.setSentDate(new Date());
msg.setText("This is a test of sending a " +
"plain text e-mail through Java.\n" +
"Here is line 2.");
Transport.send(msg);
Deepak!!!

About Java Communication API for Windows

hi
I'm studying Serial Communication in university.
I'd like to know the reason why we can't downlaod Java Communication API for Windows.
I confirmed Comm for Linux and Soralis, but I can't find Comm for Win.
Please tell me the reason if someone know.

For no particular reason Sun stopped supporting the windows version
of that package. I use rxtx which happens to allow for much faster
communication too.
The interface is identical to Sun's version, just the package differs: "gnu.io".
kind regards,
Jos

How to start with Java TV API?

Hi,
I am new to Java TV API and i don't know how to start with it. Can any body suggest me what i would require(Software and hardware) to start coding in Java TV. Is MHP API are required for it if yes then how i can get those APIs??
Thanks in advance
Sajal Mahajan
[email protected]
Message was edited by:
Sajal.Mahajan

OCAP 1.0 and 1.1 specifications are avaible here:
http://opencable.com/specifications/ocap.html
tutorials:
http://interactivetvweb.org
Emulator:
http://xletview.sourceforge.net/

Patterns in java imageio API

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