Thread: Problems with PrintWriter

Hello all,

This is my first time posting on the forums, but I'm sure I will be a regular poster pretty soon as I'm very much involved in Java Programming now.

I'm new to Java, but not new to programming, so I was a bit suprised when I had this issue. I have also googled the problem and had a lot of hits, but nothing that has solved the issue.

I'm trying to write to a text file, some lines of data. Its for an email conversion program. I'm using Rational Application Developer for WebSphere. When I run the code, the text file is empty. Here is the code:

try {
 
			PrintWriter out
			   = new PrintWriter(new BufferedWriter(new FileWriter(strFileName)));
 
		      EmailItem emailItem = emailConv.convertStreamToEmailItem
		      (
		    		  new FileInputStream("test.dxl"), 
		    		  "test", 
		    		  ".\\");
 
 
		      out.println("FROM: " + emailItem.getFrom());
 
		      out.println("TO: " + emailItem.getTo());
 
		      out.println("CC: " + emailItem.getCc());
 
		      out.println("BCC: " + emailItem.getBcc());
 
		      out.println("SUBJECT: " + emailItem.getSubject());
 
		      out.println("BODY: ### " + emailItem.getBodyHtml() + "###");
 
		      out.close();
 
} catch (Exception e) {
 
			e.toString();
		    e.printStackTrace();
 
 
		}

I have tried not using bufferwriter, I have also tried flushing, although close() does do a flush anyway, I'm completely at a loss, whatever I do, nothing is written to the text file.

Any idea's? Thanks in advance,

Darren

Maybe if the PrintWriter were defined outside the try block it would work.

EmailItem emailItem = emailConv.convertStreamToEmailItem
(
new FileInputStream("test.dxl"),
"test",
".\\");
I've never heard of passing a new FileInputStream as a parameter.

However, I think it's where you put the PrintWriter that's the problem.

Thanks very much for your response.

Here is the new code, outside of the try block, unfortunately, same problem. The file is created, but nothing inside of it.

As far as the fileinputstream being a parameter, this is an IBM specific call, that I can't control

public void Convert(String strFileName) throws IOException
	{
		emailConv = new EmailConverterService();
 
		PrintWriter out
		   = new PrintWriter(new BufferedWriter(new FileWriter(strFileName)));
 
		try {
 
 
 
		      EmailItem emailItem = emailConv.convertStreamToEmailItem
		      (
		    		  new FileInputStream("test.dxl"), 
		    		  "test", 
		    		  ".\\");
 
 
		      out.println("FROM: " + emailItem.getFrom());
 
		      out.println("TO: " + emailItem.getTo());
 
		      out.println("CC: " + emailItem.getCc());
 
		      out.println("BCC: " + emailItem.getBcc());
 
		      out.println("SUBJECT: " + emailItem.getSubject());
 
		      out.println("BODY: ### " + emailItem.getBodyHtml() + "###");
 
 
		} catch (Exception e) {
 
			e.toString();
		    e.printStackTrace();
 
 
		}
 
		out.close();

Thanks again for your help so far.

Darren

Any exceptions being thrown?

I'm not sure if this has anything to do with it, I assumed it was to do with the environment. I can't run the code inside of RAD, I have to build a runnable JAR, if I do run it inside of RAD, I get the following error:

Exception in thread "main" java.lang.UnsatisfiedLinkError: MSGConverter (Not found in java.library.path)
	at java.lang.ClassLoader.loadLibraryWithPath(ClassLoader.java:1008)
	at java.lang.ClassLoader.loadLibraryWithClassLoader(ClassLoader.java:972)
	at java.lang.System.loadLibrary(System.java:470)
	at com.ibm.icm.edc.emailconv.exch.MSGReader.<clinit>(MSGReader.java:24)
	at java.lang.J9VMInternals.initializeImpl(Native Method)
	at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
	at com.ibm.icm.edc.emailconv.exch.MSGHandler.convertMSGtoEmailItem(MSGHandler.java:311)
	at com.ibm.icm.edc.emailconv.EmailConverterService.parseEmailContent(EmailConverterService.java:902)
	at com.ibm.icm.edc.emailconv.EmailConverterService.convertStreamToEmailItem(EmailConverterService.java:230)
	at com.ibm.icm.edc.emailconv.EmailConverterService.convertStreamToEmailItem(EmailConverterService.java:131)
	at neocol.converter.ConverterService.Convert(ConverterService.java:24)
	at neocol.converter.TestConvert.main(TestConvert.java:14)

And I have no idea why! The fact that the file is created and the temp files are created, suggests that everything is running ok?

Is there a way to get the stacktrace from a runnable jar?

Originally Posted by dbridle

And I have no idea why! The fact that the file is created and the temp files are created, suggests that everything is running ok?

Nope...your file is first created, then the exception is thrown before anything is written. Not sure what you mean by 'run inside of rad',

Originally Posted by javapenguin

Maybe if the PrintWriter were defined outside the try block it would work.

EmailItem emailItem = emailConv.convertStreamToEmailItem
(
new FileInputStream("test.dxl"),
"test",
".\\");
I've never heard of passing a new FileInputStream as a parameter.

However, I think it's where you put the PrintWriter that's the problem.

Are you just guessing? This is helpful to nobody.

Originally Posted by copeg

Nope...your file is first created, then the exception is thrown before anything is written. Not sure what you mean by 'run inside of rad',

Hi Copeg,

What I mean is, im in side of Rational Application Developer, and run it, so that I can see exceptions, system.out messages, console etc. I get the linker error there. If I export it as a runnable JAR, the program runs.

Furthermore, I have no idea where the MSGConvert portion has come from, it does not seem to be anywhere in my code and there are no classes of the same name.

A system.out.println call, I assume this can only be read while in debug mode, as a runnable JAR, is there a way to retrieve those messages?

Thanks

Darren

Originally Posted by dbridle

A system.out.println call, I assume this can only be read while in debug mode, as a runnable JAR, is there a way to retrieve those messages?

Run the jar from the command line :

java -jar yourjarhere.jar

This should allow you to see exceptions and println statements. My initial guess is that you are missing a library somewhere on your classpath, in both environments...you suggest 'it runs' as a jar, but since you cannot see exceptions as you run the jar you do not know if it runs correctly

It does look like an issue with the path.

Here is the result of the java -jar:

29-Oct-2010 15:40:09 com.ibm.icm.edc.emailconv.EmailConverterService loadProps
INFO: Unable to load configuration settings. JNI logging will use the default se
tting.
29-Oct-2010 15:40:09 com.ibm.icm.edc.emailconv.EmailConverterService loadProps
INFO: Unable to load configuration settings. JNI logging will use the default se
tting.
Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoa
der.java:58)
Caused by: java.lang.UnsatisfiedLinkError: no MSGConverter in java.library.path
        at java.lang.ClassLoader.loadLibrary(Unknown Source)
        at java.lang.Runtime.loadLibrary0(Unknown Source)
        at java.lang.System.loadLibrary(Unknown Source)
        at com.ibm.icm.edc.emailconv.exch.MSGReader.<clinit>(MSGReader.java:24)
        at com.ibm.icm.edc.emailconv.exch.MSGHandler.convertMSGtoEmailItem(MSGHa
ndler.java:311)
        at com.ibm.icm.edc.emailconv.EmailConverterService.parseEmailContent(Ema
ilConverterService.java:902)
        at com.ibm.icm.edc.emailconv.EmailConverterService.convertStreamToEmailI
tem(EmailConverterService.java:230)
        at com.ibm.icm.edc.emailconv.EmailConverterService.convertStreamToEmailI
tem(EmailConverterService.java:131)
        at neocol.converter.ConverterService.Convert(ConverterService.java:24)
        at neocol.converter.TestConvert.main(TestConvert.java:14)
        ... 5 more

In my workspace, I have added 3 jar files, that contain the classes I need for the project. They are in the build path and the editor picks up the methods and properties just fine. So what am I missing?

Thanks again!

Darren

Solved!

The issue was the file I was reading in had 0 bytes in it. For some reason this was masked in a link error *boggle*. Anyway, thanks for everybodies help!

I'm not sure how to change this thread to solved?