I am facing a strange problem and I cannot find the reason. I have a
calling method, processOrder() in a plain java file in which I am doing
this.
public Order processOrder()

When should one use exceptions and when should one just return null/false?
My virtual filesystem will return exceptions when trying to open a file
that is not readable or does not exist.
Should I not just return false when trying to open a nonexistent file?

I'm trying to serialize a simple tree structure - the TreeModel behind
a JTree - but the results aren't what I hoped for (essentially, I'm
getting my default object state, rather than the state I serialized).
Does anyone have any useful pointers? There are no exceptions thrown,

We have an issue with our web application.  It's a Struts/Tiles/DAO app
spread on multiple Sun ONE web servers and one Sun ONE app server.
When a user clicks one tile's JSP "too long" (IE left nav) they receive
the session data as though they were another user.

I am trying to parse an XML document using SAX (xerces) but keep getting
org.xml.sax.SAXParseException: The encoding "windows-1252" is not supported.
How do I get the parser to either ignore the encoding or support it.
Thanks

What are custom class loaders for?
I know of these uses:
1. dealing with hot switching class code.
2. dealing with code generated on the fly.

I have a servlet
example: http://xyz.com/abc/DummyServlet/
I want to map all the requests that come on http://xyz.com/ from  some
specific IPs to http://xyz.com/abc/DummyServlet/ (ITS NOT REDIRECT,

I've got a string, containing a base64-coded PublicKey in PKCS1-format.
My goal is, to parse this string and create a PublicKey-object out of
it. But how to do this?
-----BEGIN RSA PUBLIC KEY-----

I have a java applet that makes calles via JNI to a C++ DLL.
This aplet is signed for both SUN and MS JVMs.
The DLL is packed inside the JAR file and downloaded onto the user's
harddrive into the user.home directory, then loaded.

I tried the following code in java:
/************************/
int i=0;
int[] arr={10,20,30};

I want to do is the following from a java program:
-Launch internet explorer (or any browser if possible) at:
http://myURL
-Pass POST parameters at myURL.

I have a search jsp that uses the <html:errors/> tag to display an
error if no search results were found.  Also on the page is a Clear
button to clear the search fields through javascript.  My question is
this:  Is there any way to clear the error message of "No results

Tomcat port for http is 8080. What is the Tomcat port for https? Is
that true we can set this in server.xml? If so, where to set the port
for https in server.xml?
Thanks a lot!

I have submitted a serious bug on JDK 1.5.0_05.  The command line
parser is hosed.  Ant does not work. Anything with quotes or
backslashes may stop working.   I am retreating to 1.5.0_04.

I've got a document generated with iText containing a PdfPTable, that
sometimes becomes so large that it will be split on two pages.
I want to avoid this by dividing the table in two columns within the
page. i.e. from this...: