Le jeu. 25 juil. 2019 à 07:46, Clemens Wyss DEV <clemens...@mysign.ch> a écrit :
> < mais c'était rapide 😉 > > >+1 > should/can I file a bug? > Guess so, with a small project reproducing it? > > init at bootstrap the pool (initial size) to ensure it is in one tomcat > classloader > how would you achieve this? By setting «initialSize» to «maxSize» in > PoolProperties? > 1 should be sufficient, however tomcat-jdbc (vs dbcp2 for instance) loads it per connection and not once for all the pool ( https://github.com/apache/tomcat/blob/master/modules/jdbc-pool/src/main/java/org/apache/tomcat/jdbc/pool/PooledConnection.java#L196) which is likely 1. Bad for perf but moreover 2. Buggy if the classloader changes between usages of a connection in apps. Loader, driver should be loaded once and potentially the datasource be duplicated per app if needed (driver in the app) IMHO. This would also fix your NPE transitively ;). > ---------------------------------------------------------- > Von: Romain Manni-Bucau <rmannibu...@gmail.com> > Gesendet: Donnerstag, 25. Juli 2019 07:30 > An: Tomcat Developers List <dev@tomcat.apache.org> > Betreff: Re: PooledConnection#connectUsingDriver, > Thread.currentThread().getContextClassLoader() is null > > +1, there is no real other option AFAIK until you init at bootstrap the > pool (initial size) to ensure it is in one tomcat classloader. > > Le jeu. 25 juil. 2019 à 07:08, Clemens Wyss DEV <mailto: > clemens...@mysign.ch> a écrit : > I tried posting this in the tomcat-users-ml, but I guess it rather fits > here: > ---------------------------------------------------------- > Context: > Debian GNU/Linux 9 \n \l > java version 1.8.0_162 > Tomcat 8.5.35 > > From time to time we are facing the follwing exception (call stack): > ... > Caused by: java.sql.SQLException: Unable to load class: > org.mariadb.jdbc.Driver from ClassLoader:http://java.net > .URLClassLoader@4c873330;ClassLoader:null > at > org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:292) > at > org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:212) > at > org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:736) > at > org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:668) > at > org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:198) > at > org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:132) > at org.apache.torque.Torque.getConnection(Torque.java:924) > ... 53 common frames omitted > Caused by: java.lang.ClassNotFoundException: Unable to load class: > org.mariadb.jdbc.Driver from ClassLoader:http://java.net > .URLClassLoader@4c873330;ClassLoader:null > at > org.apache.tomcat.jdbc.pool.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:56) > at > org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:280) > ... 59 common frames omitted > Caused by: java.lang.ClassNotFoundException: Classloader is null > at > org.apache.tomcat.jdbc.pool.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:40) > ... 60 common frames omitted > > According to the code (in PooledConnection# connectUsingDriver) > Thread.currentThread().getContextClassLoader() returns null > > Googling for " Thread.currentThread().getContextClassLoader() is null" the > common demoniator seems to be `getContextClassLoader can be null`. If this > is true there should be > a) a null-check in PooledConnection# connectUsingDriver > b) if null, then there should be a fallback-Classloader (the system class > laoder?) > > WDYT ? > > Or any ideas why the given exception pops up from time to time > > Thx > Clemens > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: mailto:dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: mailto:dev-h...@tomcat.apache.org >
