https://bz.apache.org/bugzilla/show_bug.cgi?id=68436
Bug ID: 68436
Summary: Hide "Not loading a JDBC driver as driverClassName
property is null" warning
Product: Tomcat 10
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ------
Unnecessary warning fills up the webapp logging file, this happens every time a
db pool creates a new connection and no classname is given.
>> Not loading a JDBC driver as driverClassName property is null.
Using the same webapp for mysqljar and mariadbjar system may use a
configuration without driverClassName field. Destination tomcat may provide
both or one of jdbc jar files without a webapp developer knowledge.
What is an empty driverClassName="" attribute was given then it's an explicit
choice and Tomcat did not need to write a warning log?
See source code:
https://github.com/apache/tomcat/blob/ed8cc4f3beddbdc7d9634cc287660322804007fd/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/PooledConnection.java#L292
if (poolProperties.getDriverClassName()==null) {
//rely on DriverManager
log.warn("Not loading a JDBC driver as driverClassName property is null.");
} else {...
See contextxml db connection example:
<!-- use mariajdbc if found then mysqljdbc -->
<Resource name="jdbc/mydb" auth="Container" type="javax.sql.DataSource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
initialSize="2" maxActive="300" maxIdle="10" maxWait="30000"
username="myuser" password="mypwd"
url="jdbc:mysql://127.0.0.1:3306/mydb?permitMysqlScheme&useUnicode=true&characterEncoding=utf8"
validationQuery="SELECT 1" validationInterval="6000"
validationQueryTimeout="10"
rollbackOnReturn="true" removeAbandoned="true" removeAbandonedTimeout="14400"
logAbandoned="false"
testOnBorrow="true" maxAge="300000" timeBetweenEvictionRunsMillis="60000"
defaultTransactionIsolation="READ_COMMITTED"
/>
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