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bharadwaja kambhammettu

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since Apr 07, 2005
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Recent posts by bharadwaja kambhammettu

Hi everybody,

I purchased a SCJD voucher during Aug 2005 and i did`nt work on the solution till now. I now want to start actively working towards it. Can i still work on the same assignment ? Or do i need to purchase a new voucher ?

Thanx & regards,
Bharadwaja K
hi all,

Without considering the file extension, i am trying to determine the file type by reading the file contents. Is that possible ?

I`ve observed that every .pdf file has "%PDF-1.3" or "%PDF-1.4" etc as the very first chars. If i try removing them, the file `ll still be a .pdf but can not be opened by the Acrobat Reader. I think that `ll help me determine whether a file is a .pdf.

My actual trouble is in reading a ".doc" file. Is there any way, i can read the bytes from a .doc file and determine whether it is actually a .doc file ? Can we identify other MS - Office files also in this manner ?

thanks in advance.
16 years ago
hi all,

I am trying to write a JApplet, which will let me select a directory on the clients machine enabling me to upload all the files in that dir and send them to a servlet.

I tried signing the applet using the "keytool" (actually followed some article from the Sun`s site), attempted to create a Policy file and finally used the "HTMLConverter" to convert the applet.

But the Sun Java Console in Internet Explorer shows a big exception stack trace. It goes like this -- >

------------------------------------------------------------------
Exception in thread "AWT-EventQueue-11" java.security.AccessControlException: access denied (java.util.PropertyPermission user.dir read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at java.io.Win32FileSystem.getUserPath(Unknown Source)
at java.io.Win32FileSystem.resolve(Unknown Source)
at java.io.File.getAbsolutePath(Unknown Source)
at sun.awt.shell.Win32ShellFolder2.<init>(Unknown Source)
at sun.awt.shell.Win32ShellFolder2.listFiles(Unknown Source)
at sun.awt.shell.ShellFolder.listFiles(Unknown Source)
at sun.awt.shell.Win32ShellFolderManager2.get(Unknown Source)
at sun.awt.shell.ShellFolder.get(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI.updateUseShellFolder(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI.installComponents(Unknown Source)
at javax.swing.plaf.basic.BasicFileChooserUI.installUI(Unknown Source)
at javax.swing.plaf.metal.MetalFileChooserUI.installUI(Unknown Source)
at javax.swing.JComponent.setUI(Unknown Source)
at javax.swing.JFileChooser.updateUI(Unknown Source)
at javax.swing.JFileChooser.setup(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at javax.swing.JFileChooser.<init>(Unknown Source)
at FileUploadApplet.actionPerformed(FileUploadApplet.java:105)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
-------------------------------------------------------------------

I actually could`nt figure out certain things right.
-- > Does the policy file created have any relevance to the Browser`s JRE ?(i`ve Java Plug-in 1.5.0_03
Using JRE version 1.5.0_03 Java HotSpot(TM) Client VM)

--> "HTMLConverter" converts the original html containing the <APPLET> into a way that the Java Plug-in for the browser understands. Is this right ?

Incidentally, the applet did`nt run even i used "appletviewer" and it showed the same exception trace.

my policy file goes like this -->

grant codebase "http://localhost:7001/FileUploadApp/~"
{
permission java.io.FilePermission "<<ALLFILES>>","read";
permission java.net.SocketPermission "*","accept,connect,listen,resolve";
permission java.util.PropertyPermission "*","read";
permission java.security.AllPermission;
permission java.lang.RuntimePermission "readFileDescriptor";
};


plz clarify my doubts. Thanks in advance.
16 years ago
hi all,

What is the difference between getContextPath() and getRealPath() in HttpServletRequest ? Can anybody throw some light on this ?
I intend to call them from the JSP implicit object, request.
16 years ago
hi,

I am in a dilemma as to which certification to pursue, either SCWCD or SCBCD.

What makes me ask such a question ???
Actually, as far as i see, there are so many projects (in many companies in India) involving Servlets & JSP`s and little EJB (Stateless Session Beans only). Incidentally, my team decided against EJB`s and choose Hibernate.
Also, many development teams are begining to switch over to some sort of a framework i.e Struts or Java Server Faces etc instead of Servlets & JSP`s alone.

So, can any one guide me as to which certification `ll help me, SCWCD or SCBCD or nothing at all !!!