ClassCastException in webapp, but OK from console
Teaching myself webapps.
Using Tomcat, I am writing a webapp for the small private school where my wife works. It manages the assignment of students to the rotating schedule of art periods during the day, always done by hand up till now (maddening).
One of the things I want to be able to do is not just display database info in the browser, I also want an option for the user to write certain things out to a file and then be able to get the file and print it, like a listing of the current classes and the students assigned. Printing off a web page is not very satisfactory.
I found how to use Java to open and write to a file, so I hope I can make that work. I wrote a simple test class to play with it, and it works from a command line. It creates the file and writes to it just fine. I was delighted.
import java.io.*;
public class OutWrite
public static void write()
try
PrintWriter out = new PrintWriter(
new BufferedWriter(
new FileWriter("c:/word.doc")) );
out.println("This is the big test.");
out.close();
catch (IOException ioe)
System.out.println("ouch");
But it throws a ClassCastException when I tried to add it into the app. I just added it into the init() of one of the first servlets that's called
public void init()
OutWrite.write();
When I click the button that calls that servlet, it now throws the exception:
java.lang.ClassCastException: OutWrite
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:903)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:668)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:416)
at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java:180)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2415)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:223)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:594)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:619)
at java.lang.Thread.run(Thread.java:536)
I hope this is a "rookie" situation where there's just some piece of the puzzle that I don't know about.
Thanks
shok 411:
Yes, I have it in WEB-INF/classes, thanks. That was a learning hurdle I jumped over (with help on this forum) a month ago ....
And I did it first the way you suggested, and then tried it again as a static call.
But I found the problem now -- I'm such a dope. I do this stuff by groping around in the dark, reading online tutorials, buying books, trying things and throwing them out. And I often lose track of what I do.
10 minutes earlier I had tried to just get the button in the app to directly call the OutWrite class. I took the form/action call that previously pointed to an existing servlet and "temporarily" pointed it to OutWrite
<form target="worksheetframe" action="http://felecha:8080/ArtBlocks/servlet/OutWrite">
That got the exception (which I would still like to know why).
Then I thought - hey, put a call to it as just a java class called from that existing servlet already in the app, just stick it into its init() call. Well, I did that, but never went back to correct the action of the button. I just now found it, and sure enough, if the action of the button calls the existing servlet which in turn just makes a static call to OutWrite.write(), bingo! It writes to the file! (the static version works)
But now there's a new problem, and I will have to wait till I get home from work.
It will create and write to the file the first time. If I then delete the file and click the button again, it will not. It will only do it for me if I use the Tomcat Manager "reload" feature and then do it.
What can that mean???
And at some point I have to learn how I can append to the file or overwrite it.
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MessageBox.Show Method (String)
Best Regards,
Linda Li
Linda Li
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Message was edited by: Timothy S CaleThanks Thomas:
I am new to Macs, so I don't know the terminology. I am also new to forums/discussions . . .
I lost the ability to login to my account using the GUI. How that happened I don't really know. But I remember two things when looking at System Preferences for Accounts before the "fall". I had a Network Account Server that was seemingly associated with a company for which I worked in the past, and that there was a check next to "Allow Network Users to Login" (or something close to that.) I deleted the server listed, and unchecked the option to allow Network Users to Login.
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