Hi Joseph,
It would probably be more relevant to report this to Spring since the
code you are referring to is not within Hibernate.
p.s. first time i've seen someone having to decompile opensource classes
to fix things ;)
/max
Hi all.
In debugging a JDBC-related issue with hibernate and
WebLogic I found a file:
org.springframework.jdbc.datasource.DriverManagerDataSource.
There is a part of this file that hurts JDBC concurrency
in multithreaded applications like WebLogic, and I have a
solution. I would like to suggest a better alternative that
would probably be named DriverDataSource.
The problem is that *all* java.sql.DriverManager calls are
class-synchronized. This include getConnection() and some very
simple methods like DriverManager.println() which every driver
may be calling continually at runtime (whether or not there is
a DriverManager log stream). The constructor for SQLException
calls this method.
This means that one slow call to DriverManager.getConnection()
can temporarily block all other JDBC in the whole JVM. In some
cases we have even seen deadlocks where one thread that holds the
DriverManager lock calls another thread that wants to do JDBC.
The solution is to remove all calls to DriverManager.getConnection()
and replace them with a simple call to Driver.connect(). In fact,
this is what the DriverManager itself does, except that for every
getConnection() call, the DriverManager goes through it's list of
every registered driver in the JVM, trying each one with your URL
and properties until it finds one that doesn't throw an exception
and returns a connection. I decompiled and altered the
DriverManagerDataSource to do that, for a customer to try, and I
have attached it to this email as a suggestion for your consideration.
HTH,
Joe Weinstein at BEA
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Max Rydahl Andersen
callto://max.rydahl.andersen
Hibernate
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