Graggle at 23:26, 21 April 2026

2026-04-21T23:26:22Z

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	[[Category:Jobs]]		[[Category:Jobs]]
	==J2EE/Java Interview Questions==		==J2EE/Java Interview Questions==

Receive at 03:08, 20 April 2007

2007-04-20T03:08:59Z

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			[[Category:Jobs]]
	==J2EE/Java Interview Questions==		==J2EE/Java Interview Questions==

Fatwa at 10:35, 8 March 2006

2006-03-08T10:35:22Z

← Older revision		Revision as of 10:35, 8 March 2006
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	==Interview Questions==		==J2EE/Java Interview Questions==

			Back to [[Interview Questions]]

	===JDBC===		===JDBC===

Fatwa at 10:33, 8 March 2006

2006-03-08T10:33:40Z

New page

==Interview Questions==

===JDBC===
* What is connection pooling? Why is it used?
* How would you ensure a connection is always freed?
* Write a small piece of pseudo-code to show how you'd open a connection, handle a commit/ rollback, and close the connection.

===JSP===
* Explain what a JSP is, and talk about the life cycle of a JSP from code to deployment?
* What's the difference between forwarding on to a different page with HttpRequest.forward(url) and HttpResponse.sendRedirect(url);
* Talk about the differences between different scopes of variables in jsp, e.g. session, page, application scope.
* If there was a problem with login sessions timing out too early, where would you look to see the setting?

===XML===
* What are the differences between the SAX and the DOM models for parsing. What are their advantages/disadvantages?
* Given this DTD

<!DOCTYPE NEWSPAPER [

<!ELEMENT NEWSPAPER (ARTICLE+)>
<!ELEMENT ARTICLE (HEADLINE,BODY)>
<!ELEMENT HEADLINE (#PCDATA)>
<!ELEMENT BODY (#PCDATA)>

<!ATTLIST ARTICLE AUTHOR CDATA #REQUIRED>
<!ATTLIST ARTICLE EDITOR CDATA #IMPLIED>

]>

Write out two short bits of XML that would validate based on this DTD.

* Given an exception like this, what would be your thoughts on where to look for the problem?

com.ibm.wcm.xml.sax.SAXParseException: The value of attribute "conditions" must not contain the '<' character.
at com.ibm.wcm.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1196)
at com.ibm.wcm.apache.xerces.framework.XMLDocumentScanner.reportFatalXMLError(XMLDocumentScanner.java:654)
at com.ibm.wcm.apache.xerces.framework.XMLDocumentScanner.scanAttValue(XMLDocumentScanner.java(Compiled Code))
at com.ibm.wcm.apache.xerces.framework.XMLDocumentScanner.scanElement(XMLDocumentScanner.java(Compiled Code))
at com.ibm.wcm.apache.xerces.framework.XMLDocumentScanner$ContentDispatcher.dispatch(XMLDocumentScanner.java(Compiled Code))
at com.ibm.wcm.apache.xerces.framework.XMLDocumentScanner.parseSome(XMLDocumentScanner.java:381)
at com.ibm.wcm.apache.xerces.framework.XMLParser.parse(XMLParser.java:1081)
at com.ibm.wcm.apache.xerces.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:195)
at com.ibm.wcm.common.XMLDocumentProcessor.stringToNode(Unknown Source)
at com.ibm.wca.MassLoader.ErrorReporter.ErrorProcessor.createRecordNode(Unknown Source)
at com.ibm.wca.MassLoader.ErrorReporter.ErrorProcessor.addError(UnknownSource)
at com.ibm.wca.MassLoader.ErrorReporter.DefaultErrorReporter.processErrorEvent(Unknown Source)
at com.ibm.wca.MassLoader.ErrorReporter.DefaultErrorReporter.event(Unknown Source)
at com.ibm.wca.MassLoader.Events.MassLoaderEventHandler.notifyListners(Unknown Source)(Compiled Code)
at com.ibm.wca.MassLoader.Writer.JDBCWriter$WriteWorker.processFailure(Unknown Source)
at com.ibm.wca.MassLoader.Writer.JDBCWriter$WriteWorker.run(Unknown Source)(Compiled Code)
Error in MassLoading, please check logs for details.

===Java===

*Explain the ideas behind java.lang.Thread and java.lang.Runnable, and the run() and start() methods.

*Write some pseudo code to show the rough idea of the java.util.Observer / java.util.Observable classes and/or the general Observer/Observable pattern?

*How would you list the contents of a jar file?

*What would this class print out if you ran it?

public class test
{

public Integer i;

public static void main(String[] args)
{
test t = new test();

System.out.println(" 1: " + t.stringEq() );

String str = "hello 123 there";
trim(str);
System.out.println(" 2: " + str );

Integer sq = t.square(t.i);
System.out.println(" 3: " + sq );
}

public boolean stringEq()
{
return "abc" == "abc";
}

private static void trim(String str)
{
// remove white space
str.replaceAll("\\s", "");
// remove non-letters
str.replaceAll("\\W", "");
}

private Integer square(Integer i )
{
return new Integer(i.intValue() * i.intValue());
}
}

===EJB===
* What are the different types of EJB?

* Draw a diagram showing how EJB usage works, in terms of the different objects which are created and used when you call remote methods on an EJB.

Java - Revision history

Graggle at 23:26, 21 April 2026

Receive at 03:08, 20 April 2007

Fatwa at 10:35, 8 March 2006

Fatwa at 10:33, 8 March 2006