https://bz.apache.org/bugzilla/show_bug.cgi?id=63612
Bug ID: 63612
Summary: PooledConnection#connectUsingDriver,
Thread.currentThread().getContextClassLoader() is null
Product: Tomcat Modules
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: jdbc-pool
Assignee: dev@tomcat.apache.org
Reporter: clemens...@mysign.ch
Target Milestone: ---
>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?)
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