asked on

Servlet Problem , ObjectInputStream ...

Hi Everybody,

The following doGet method is giving me problems.
If I comment out the statements:
ObjectInputStream input=new ObjectInputStream(request.getInputStream());

and the other code dependant on it, the servlet works.

What might be the problem?

Thanks
Mimo

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
ObjectInputStream input=new ObjectInputStream(request.getInputStream());
/**
* Sets the content type
*/
response.setContentType("text/html");

try {

PrintWriter out = response.getWriter();

out.println("<html ><head><title>Reference Check Results</title></head><body >");
searchParam = (Vector) input.readObject();
tableName= (String) searchParam.get(0);
primaryCol = (String) searchParam.get(1);
primaryKey = (String) searchParam.get(2);
out.println(getRecords(tableName,primaryCol,primaryKey));
out.println("</body></html>");
out.close();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();

}
}

radarsh

What is the error you are getting? If you have any exception, post it's stack trace.

________
radarsh

asaliu

ASKER

22-Mar-2006 21:12:28 org.apache.catalina.core.StandardWrapperValve invoke
WARNING: Servlet.service() for servlet checkServlet threw exception
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2232)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2698)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:750)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:268)
at checkServlet.doGet(checkServlet.java:46)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:362)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)

Mick Barry

looks like it is not an object stream.
If its not an object stream you can't use it with an ObjectInputStream

asaliu

ASKER

This is the method which is calling the servlet in case it helps ...

private void CheckReference(String table,String primaryCol, String primarykey){

try {
Vector vect =new Vector();
vect.add(new String(table));
vect.add(new String(primaryCol));
vect.add(new String(primarykey));
// Initialize URL to call the servlet
URL url=new URL("http://localhost/WebApplication1/checkServlet");
URLConnection servletConnection = url.openConnection();
// Set client caching to false
servletConnection.setUseCaches(false);

// Enable I/O through the connection
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);

ObjectOutputStream output = new ObjectOutputStream(servletConnection.getOutputStream());

// vector to pass search imput {database table, primary key column, name column, primary key)

output.writeObject(vect);

// flush and close the output
output.flush();
output.close();

URL index = new URL("http://localhost/WebApplication1/checkServlet");
new searchPopUp("Reference Check Result", index);
} catch (MalformedURLException ex) {
ex.printStackTrace();
} catch(Exception e) {
// Exception occured during search
e.printStackTrace();
message+="\nProblem during connection with web server\nYou might want to check"+
" your internet connection or if the Web Server / Database in up and running.";

}

}

Mick Barry

> new searchPopUp("Reference Check Result", index);

whats this do?

asaliu

ASKER

This creates a jEditorPane which displays the html result from the servlet,
It uses the servlet address as you've guessed by now.

SOLUTION

Mick Barry

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

asaliu

ASKER

Yes,
Pls see below:

ObjectOutputStream output = new ObjectOutputStream(servletConnection.getOutputStream());

// vector to pass search imput {database table, primary key column, name column, primary key)

output.writeObject(vect);

// flush and close the output
output.flush();
output.close();

Mick Barry

what else is in in searchPopup()'s constructor?

Mayank S

What objects does the Vector contain?

asaliu

ASKER

>what else is in in searchPopup()'s constructor?

public searchPopUp(String title,URL hlpURL) {
super(title);
helpURL = hlpURL;
editorpane = new JEditorPane();
editorpane.setEditable(false);

try {
editorpane.setContentType("text/html");
editorpane.setPage(helpURL);
}
catch (Exception ex) {
ex.printStackTrace();
}

//anonymous inner listener
editorpane.addHyperlinkListener(new HyperlinkListener() {
public void hyperlinkUpdate(HyperlinkEvent ev) {
try {
if (ev.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
editorpane.setPage(ev.getURL());
}
} catch (IOException ex) {
//put message in window
ex.printStackTrace();
}
}
});
getContentPane().add(new JScrollPane(editorpane));
addButtons();
// no need for listener just dispose
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// dynamically set location
calculateLocation();
setVisible(true);
// end constructor
}

>What objects does the Vector contain?
three String objects

Leo Eikelman

Try this,

First "rebuild" the servlet - THEN "rebuild" the applet.

See if that fixes the problem.

cheers,

Leo

asaliu

ASKER

>First "rebuild" the servlet - THEN "rebuild" the applet.
Tried it but it gives the same error stack trace

ASKER CERTIFIED SOLUTION

Leo Eikelman

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

asaliu

ASKER

>I don't think u can set contentType when using input/output
I did suspect that.

I tried this:
got rid of

response.setContentType("text/html");

instead of trying to write html directly I posted back to the GUI requesting the result
a String which builds a html page.

then from the client I changed the jEditorPane which initially had a ulr page set into it.
Now that jEditorPane uses the String to build its html page.

That worked.

Thanks Leo,

Leo Eikelman

No problem at all.

Happy programming.

Leo