Bugs item #799730, was opened at 2003-09-03 21:16
Message generated for change (Tracker Item Submitted) made by Item Submitter
You can respond by visiting:
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Category: JBossServer
Group: v4.0
Status: Open
Resolution: None
Priority: 5
Submitted By: Craig Munday (cmunday)
Assigned to: Nobody/Anonymous (nobody)
Summary: JDBC Driver being registered twice.
Initial Comment:
Windows 2000
JDK 1.4.2
JBOSS 4.0DR2
I am currently writing a JDBC Driver and have noticed
that JBoss does not initialise the driver class the first
time an attempt to load it is made - hence the static
initialiser is not called. My driver contains the
recommended initialiser and should be compliant:
public class MyDriver implements java.sql.Driver
{
static
{
java.sql.DriverManager.registerDriver(new MyDriver
());
}
. . .
}
The method having the problem is:
protected void checkDriver(final String url) throws
ResourceException
when it attempts to load the driver class with the
following code:
//try to load the class... this should register with
DriverManager.
Class clazz = Thread.currentThread
().getContextClassLoader().loadClass(driverClass);
It appears that the ClassLoader.loadClass() method does
not initialize the driver class which means the static
initialiser will not be invoked.
The specification states that the driver class should be
loaded with the Class.forName(...) method which WILL
initialise the class (and invoke the Driver's static
initialiser).
The code following the call to loadClass() will load the
driver twice because the first attempt (described above)
will not succeed.
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