Non-serializable field in serializable class (transient keyword)

Question

I have a serializable class that extends Servlet

public class FileDownload extends HttpServlet{
  @SuppressWarnings("compatibility:6754389671327954013")
  private static final long serialVersionUID = 1L;
  private ResultSet rset;
  ......
}

My Question is:

Is the rset object automatically converted as transient at compile- or run-time? or do I have to mark it explicitly as transient? (That is a warning brought up from my IDE JDeveloper).

educational kind o question :) it could be any other type of Object — MaVRoSCy
– MaVRoSCy, Commented Jul 5, 2012 at 14:30

user207421 · Accepted Answer · 2021-03-21 02:35:16Z

2

No, the field is not neglected by serialization - you'll get a java.io.NotSerializableException if you try to serialize an instance of FileDownload. Mark it transient. Btw, what is a ResultSet doing as a field in a Servlet? This is not thread-safe. ResultSets should be local variables only, in any context.

edited Mar 21, 2021 at 2:35

user207421

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answered Jul 5, 2012 at 14:36

Gustav Barkefors

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Comments

UVM · Accepted Answer · 2012-07-05 14:25:21Z

0

You have to call transient your own.But you cannot serialize an object unless it implements Serializable interface.ResultSet is such kind of object.

answered Jul 5, 2012 at 14:25

UVM

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1 Comment

user207421 Over a year ago

First sentence is meaningless. Second is incorrect: ResultSet isn't an object at all, it is an interface.

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