Unable to create a JDBC driver using custom class loader
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Key: DBCP-333
URL: https://issues.apache.org/jira/browse/DBCP-333
Project: Commons Dbcp
Issue Type: Bug
Affects Versions: 1.3
Reporter: Krasimir Nedkov
Hello,
I'm unable to instantiate my JDBC driver using a custom class loader:
BasicDataSource ds = new BasicDataSource();
String connectURL =
"jdbc:mysql://"+config.getHost()+"/"+config.getDatabaseName();
ds.setDriverClassName(MySQLStore.MYSQL_DRIVER);
ds.setDriverClassLoader(config.getClass().getClassLoader());
.....
Having a look at the
org.apache.commons.dbcp.BasicDataSource.createConnectionFactory() method
implementation, I found that the class loader is actually ignored. In the first
part of the method there is an attempt to load the class that seems to pass
successfully, but the loaded class is not assigned to the driverFromCCL
variable:
if (driverClassLoader == null) {
Class.forName(driverClassName);
} else {
Class.forName(driverClassName, true, driverClassLoader);
}
Then in the second part of the method driverFromCCL is still null and instead
of instantiating the driver directly, DriverManager.getDriver(url) is called,
which fails:
if (driverFromCCL == null) {
driver = DriverManager.getDriver(url);
} else {
// Usage of DriverManager is not possible, as it does not
// respect the ContextClassLoader
driver = (Driver) driverFromCCL.newInstance();
if (!driver.acceptsURL(url)) {
throw new SQLException("No suitable driver", "08001");
}
}
Kind regards,
Krasimir
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