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Servlet: Slow transfer of serialized data over network

Posted on 2007-03-21
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Last Modified: 2013-11-24
Hi,

I wish to save the data from my Applet to the server through Servlet.
I am serializing the vector data over the network and sending through URLConnection.
But the readObject() method on the remote servlet is very slow in reading the data.
It takes over 4 minutes for the same.
However on the local machine, similar method just takes 2-3 seconds.

Can someone please help me so that my serialized data transfer to Servlet is fast.
I intend to do the job in not more than few seconds.
Thanks in advance.

Best regards,
Rahul
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Question by:rahul_asanikar
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Expert Comment

by:Mayank S
ID: 18769171
What is the data that you are storing in the Vector? Try using an ArrayList instead though I doubt if it will affect serialization/ deserialization speed.
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by:Ajay-Singh
ID: 18769293
Use BufferedInputStream to read the data.
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by:Kuldeepchaturvedi
ID: 18777926
what kind of data it is? if its all primitive types ( string, integer etc).. you might be able to send them thru on plain HTTP protocol
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Author Comment

by:rahul_asanikar
ID: 18785381
I am having an ImageIcon object (the image to be saved on server) and a String (image name) in the vector.
Unfortunately, ArrayList and BufferedInputStream don't seem to help much.
Guess if it vector data is compressed, the amount of data to be transferred would decrease.
Do give your opinion in this regard or any other options available.
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by:Ajay-Singh
ID: 18785422
Did you try BufferedInputStream?
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by:Mayank S
ID: 18785666
What objects are you passing in the Vector?
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Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 

Author Comment

by:rahul_asanikar
ID: 18788666
I tried BufferedInputStream to read the serialized data on servlet, but could not find any benefit.
The data in my vector is an image (ImageIcon object) and a String (the image name).
The image is supposed to be saved on the server with the given name through servlet.
The image save time has become a performance bottleneck!!
So the problem needs to be quickly solved.
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Ajay-Singh earned 63 total points
ID: 18788706
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Expert Comment

by:Mayank S
ID: 18788838
Try serializing the object to bytes and sending the byte[] array in chunks using a BufferedOutputStream and read on the other end using BufferedInputStream - similar to what Ajay had said earlier.
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by:Mayank S
ID: 18788840
Also, if there are users waiting for this operation to be completed before they can do something else, maybe do this in another thread.
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Author Comment

by:rahul_asanikar
ID: 18832881
My Applet gives security exception when tried to implement XMLEncoder.
Basically, the security policies of the Applet prevents the operation.

Just wish to add that my ImageIcon object is derived from an Image object that is created on the fly.
The image is created based on what the user draws using the Applet.
Hence, would prefer to wait for the image save in the same thread as the user should not be allowed to update the image contents during the process.

Please let me know if any other solution would help me save the image on server in just few seconds.
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by:Mayank S
Mayank S earned 62 total points
ID: 19047263
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