How to read appended objects from file with ObjectInputStream?
Hi to everyone. I'm new to Java so my question may look really stupid to most of you but I couldn't fined a solution by myself... I wanted to make an application, something like address book that is storing information about different people. So I decided to make a class that will hold the information for each person (for example: nickname, name, e-mail, web address and so on), then using the ObjectOutputStream the information will be save to a file. If I want to add a new record for a new person I'll simply append it to the already existing file. So far so good but soon I discovered that I can not read the appended objects using ObjectInputStream.
What I mean is that if I create new file and then in one session save several objects to it using ObjectOutputStream they all will be read with no problem by ObjectInputStream. But after that if in a new session I append new objects they won't be read. The ObjectInputStream will read the objects from the first session after that IOException will be generated and the reading will stop just before the appended objects from the second session.
The following is just a simple test it's not actual code from the program I was talking about. Instead of objects containing different kind of information I'm using only strings here. To use the program use as arguments in the console "w" to create new file followed by the file name and the strings you want save to the file (as objects). Example: "+w TestFile.obj Thats Just A Test+". Then to read it use "r" (for reading), followed by the file name. Example "+r TestFile.obj+". As a result you'll see that all the strings that are saved in the file can be successfully read back. Then do the same: "+w TestFile.obj Thats Second Test+" and then read again "+r TestFile.obj+". What will happen is that the strings only from the first sessions will be read and the ones from the second session will not.
I am sorry for making this that long but I couldn't explain it more simple. If someone can give me a solution I'll be happy to hear it! ^.^ I'll also be glad if someone propose different approach of the problem! Here is the code:
import java.io.*;
class Fio
public static void main(String[] args)
try
if (args[0].equals("w"))
FileOutputStream fos = new FileOutputStream(args[1], true);
ObjectOutputStream oos = new ObjectOutputStream(fos);
for (int i = 2; i < args.length ; i++)
oos.writeObject(args);
fos.close();
else if (args[0].equals("r"))
FileInputStream fis = new FileInputStream(args[1]);
ObjectInputStream ois = new ObjectInputStream(fis);
for (int i = 0; i < fis.available(); i++)
System.out.println((String)ois.readObject());
fis.close();
else
System.out.println("Wrong args!");
catch (IndexOutOfBoundsException exc)
System.out.println("You must use \"w\" or \"r\" followed by the file name as args!");
catch (IOException exc)
System.out.println("I/O exception appeard!");
catch (ClassNotFoundException exc)
System.out.println("Can not find the needed class");
How to read appended objects from file with ObjectInputStream? The short answer is you can't.
The long answer is you can if you put some work into it. The general outline would be to create a file with a format that will allow the storage of multiple streams within it. If you use a RandomAccessFile, you can create a header containing the length. If you use streams, you'll have to use a block protocol. The reason for this is that I don't think ObjectInputStream is guaranteed to read the same number of bytes ObjectOutputStream writes to it (e.g., it could skip ending padding or such).
Next, you'll need to create an object that can return more InputStream objects, one per stream written to the file.
Not trivial, but that's how you'd do it.
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at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:214)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:306)
at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:385)
at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:745)
at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.ja
va:675)
at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:868)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:684)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.InvalidClassException: net.sf.jasperreports.engine.base.JRBas
eReport; local class incompatible: stream classdesc serialVersionUID = 604, loca
l class serialVersionUID = 606
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:86
... 33 more
Anyone pls help. It's bit urgent. Thanks.I was using iReport v0.5.0 and it uses jasperreports-0.6.7.jar (v0.6.7) of
JasperReports. I compiled and i deployed my application in BEA weblogic server. I got the error listed below. Only after i saw your
response explaining that iReport was the issue, i checked the iReport lib directory and found this version of jasperreport jar.
iReport creates a java source file which is used to a jasper file.
iReport will link in the v0.6.7 version of jasperReports. When you
deploy your web application it will recognize this version through the compiled jasper file and give you the InvalidClassException, even
though you only have one jasperReport jar deployed with your war file.
The way i fixed this problem was to create my web application with the
jasperreport jar comes with iReport.
Thanks for mentioning iReport.
Christopher
Error:
Caused by: java.io.InvalidClassException: net.sf.jasperreports.engine.base.JRBas
eReport; local class incompatible: stream classdesc serialVersionUID = 607, local class serialVersionUID = 10002
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:463)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1521)
... -
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In RWB --> Cache Monitoring --> Integration Server (Java) -> (Search for Value Mapping Groups) in this each item is identified by Value Mapping Group (GroupID, Context, Identifier/Agency, Identifier/Scheme). Either we create Value Mapping Table in ID or replicate value mapping data directly from text file/SAP table etc., in run time cache, data will be identified in this manner.
Now, our requirement is to delete a record the Cache for a particular context. Two operations provided by XI one is 'Delete' and another one is 'DeleteGroup'. When we use either of this, we should know GroupID. Suppose, I replicated some large amount of data from my text file in Runtime Cache. Value Mapping Table is like that IN --> India, US --> USA, AU --> Australia, EG --> Egypt. Now, I am required to write a program to get the input country code from user which is going to delete in the value mapping table like IN/AU.... For this, what logic we should follow in the program is, First we scan the value mapping table and find the record (country code) which is match with the input. Then find the GUID value for this record. Now we use the DeleteGroup Operation and pass this GUID and then delete the record.
So, in essence, how to read the GUID from value mapping context.
Friends, Kindly help me to do this.
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