Hi All,
I am actually calling a
servlet from an
applet to generate a PDF report.
I have to pass certain objects from applet to servlet.
The code on my applet is as follows
Vector vec = new Vector();
vec.add("abc");
vec.add("xyz");
String issueReportUrl="http://localhost/sr/servlet/TBQReports";//getTBQReportPath();
StringBuffer sb = new StringBuffer(issueReportUrl);
try {
URL url = getURL(sb.toString());
URLConnection servletConnection = url.openConnection();
if (servletConnection instanceof HttpURLConnection)
{
((HttpURLConnection)servletConnection).setRequestMethod("POST");
}
else
{
System.out.println("this connection is NOT an HttpUrlConnection connection");
return;
}
servletConnection.setDoInput(true);
servletConnection.setDoOutput(true);
servletConnection.setUseCaches (false);
servletConnection.setDefaultUseCaches (false);
servletConnection.setRequestProperty("Content-Type", "application/octet-stream");
OutputStream os= servletConnection.getOutputStream();
ObjectOutputStream out = new ObjectOutputStream(os);
out.writeObject(vec);
out.flush();
out.close();
parentModule.getAppletContext().showDocument(url, "_blank");
} catch (Exception tr) {
Utility.showMsgBox(Utility.findParentFrame(this), "In actionPerformed" + tr.getMessage(), 1)
}
The code in my servlet is as follows
ObjectInputStream inputFromApplet = null;
PrintWriter out = null;
Vector data = null;
try {
// get an input stream from the applet
inputFromApplet = new ObjectInputStream(new BufferedInputStream(request.getInputStream()));
System.out.println("read Object...");
// read the serialized data from applet
Vector o = (Vector)inputFromApplet.readObject();
if(o != null && (o instanceof Vector))
{
data = (Vector) o;
System.out.println("Got Object"+data.get(0));
inputFromApplet.close();
// send back a confirmation message to the applet
out = new PrintWriter(response.getOutputStream());
response.setContentType("text/plain");
out.println("confirmed " + data.get(0));
out.flush();
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
When i run the code, i get the following exception
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream
.java(Compiled Code))
at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputS
tream.java:2671)
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:767
)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:286)
at TBQReports.doPost(TBQReports.java:70)
at TBQReports.doGet(TBQReports.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServl
et.java:417)
at org.apache.catalina.servlets.InvokerServlet.doGet(InvokerServlet.java
:131)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:696)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:198)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:144)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:209)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:595)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:432)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:138)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:595)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:432)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2459)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:132)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:595)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:118)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:593)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:116)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:593)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:432)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:126)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:595)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:432)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:954)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:15
2)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.p
rocessConnection(Http11BaseProtocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFol
lowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
at java.lang.Thread.run(Thread.java:568)
The line number that it is pointing is
inputFromApplet = new ObjectInputStream(new BufferedInputStream(request.getInputStream())); in my servlet.
I tried flush the data, closing the outputStream. But still couldnt figure out its cause.
Please help.
PS:- The same code works if i pass the values as query string.But the data is large hence i want to pass it as an Object.
Thanks,
Regards,
S.R.K.Vivek Raju
