Using Toolkit.getDefaultToolkit().getImage() within JSP

[Greg Scharlemann]

I am attempting to upload a picture to a webserver and create a
thumbnail from the picture uploaded. The problem comes in when I
attempt to create an Image object from the File object (which is the
location of the uploaded picture)...I get the following error:

java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
at java.awt.Toolkit$2.run(Toolkit.java:712)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:70 3)
at _admin._addpicture__jsp._jspService(/www/mcmanis.scharlemann.com/admin/addpicture.jsp:89)
at com.caucho.jsp.JavaPage.service(JavaPage.java:74)
at com.caucho.jsp.Page.subservice(Page.java:485)
at com.caucho.server.http.FilterChainPage.doFilter(Fi lterChainPage.java:176)
at com.caucho.server.http.Invocation.service(Invocati on.java:278)
at com.caucho.server.http.ServletServer.serviceTop(Se rvletServer.java:847)
at com.caucho.server.http.HttpRequest.handleRequest(H ttpRequest.java:213)
at com.caucho.server.http.HttpRequest.handleConnectio n(HttpRequest.java:158)
at com.caucho.server.TcpConnection.run(TcpConnection. java:140)
at java.lang.Thread.run(Thread.java:536)
Basically here is what happens. I use a multipart/form-data html form
within my html page to upload the picture to the server. I have no
problem doing this. The picture is saved in a temporary location. I
then attempt to create a thumbnail from the picture with the code from
here: http://www.geocities.com/marcoschmid...thumbnail.html

The problem is...whether in a JavaBean...or directly in the JSP
page...the line where I try to create the Image with the Toolkit
throws the NoClassDefFoundError.
Line 87 in addpicture.jsp is:
Image image = Toolkit.getDefaultToolkit().getImage(
file.getCanonicalPath());

where file is the object pointing to the temporary location of the
uploaded picture. If anyone has any idea how to fix/get arround this
problem I would appreciate any help. Thanks

[Neomorph]

On 30 Aug 2003 20:58:00 -0700, gr**@dreamatlantic.com (Greg Scharlemann)
two-finger typed:

I am attempting to upload a picture to a webserver and create a
thumbnail from the picture uploaded. The problem comes in when I
attempt to create an Image object from the File object (which is the
location of the uploaded picture)...I get the following error:

java.lang.NoClassDefFoundError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:130)
at java.awt.Toolkit$2.run(Toolkit.java:712)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:70 3)
at _admin._addpicture__jsp._jspService(/www/mcmanis.scharlemann.com/admin/addpicture.jsp:89)
at com.caucho.jsp.JavaPage.service(JavaPage.java:74)
at com.caucho.jsp.Page.subservice(Page.java:485)
at com.caucho.server.http.FilterChainPage.doFilter(Fi lterChainPage.java:176)
at com.caucho.server.http.Invocation.service(Invocati on.java:278)
at com.caucho.server.http.ServletServer.serviceTop(Se rvletServer.java:847)
at com.caucho.server.http.HttpRequest.handleRequest(H ttpRequest.java:213)
at com.caucho.server.http.HttpRequest.handleConnectio n(HttpRequest.java:158)
at com.caucho.server.TcpConnection.run(TcpConnection. java:140)
at java.lang.Thread.run(Thread.java:536)
Basically here is what happens. I use a multipart/form-data html form
within my html page to upload the picture to the server. I have no
problem doing this. The picture is saved in a temporary location. I
then attempt to create a thumbnail from the picture with the code from
here: http://www.geocities.com/marcoschmid...thumbnail.html

The problem is...whether in a JavaBean...or directly in the JSP
page...the line where I try to create the Image with the Toolkit
throws the NoClassDefFoundError.
Line 87 in addpicture.jsp is:
Image image = Toolkit.getDefaultToolkit().getImage(
file.getCanonicalPath());

where file is the object pointing to the temporary location of the
uploaded picture. If anyone has any idea how to fix/get arround this
problem I would appreciate any help. Thanks

I think the problem here is, that you cannot use the Image subsystem (or
any AWT peering classes) when you are not running within the shell of an
X-Windows system.
So, you may need to have an initialized X-Windows running on the server for
this to work properly.

You could write your own algorithm so read the file, interpret the data and
create the proper data for an output file - all from the bytes you read.

JPEG but is a lot of algorithmic work, and while GIF is easiest to read, it
has a few peculiarities like animation that can make things harder.

Cheers.