Re: PooledConnection#connectUsingDriver, Thread.currentThread().getContextClassLoader() is null

2019-07-25 Thread Thomas Meyer 
Am 25. Juli 2019 08:07:18 MESZ schrieb Clemens Wyss DEV :
>Note: I have moved this "issue" over to the tomcat-dev mailinglist ...
>
>-Ursprüngliche Nachricht-
>Von: Clemens Wyss DEV  
>Gesendet: Mittwoch, 24. Juli 2019 11:07
>An: 'Tomcat Users List' 
>Betreff: PooledConnection#connectUsingDriver,
>Thread.currentThread().getContextClassLoader() is null
>
>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: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: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
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>-
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>>

Hi,

Is the driver part of the web app or installed in tomcat's lib directory?

Does the error happen after startup of tomcat or after running for some time?

With kind regards
Thomas
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AW: PooledConnection#connectUsingDriver, Thread.currentThread().getContextClassLoader() is null

2019-07-25 Thread Clemens Wyss DEV 
Note: I have moved this "issue" over to the tomcat-dev mailinglist ...

-Ursprüngliche Nachricht-
Von: Clemens Wyss DEV  
Gesendet: Mittwoch, 24. Juli 2019 11:07
An: 'Tomcat Users List' 
Betreff: PooledConnection#connectUsingDriver, 
Thread.currentThread().getContextClassLoader() is null

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: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: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
B�CB��[��X��ܚX�KK[XZ[
�\�\��][��X��ܚX�P�X�]
�\X�K�ܙ�B��܈Y][ۘ[��[X[��K[XZ[
�\�\��Z[�X�]
�\X�K�ܙ�B�

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To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
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PooledConnection#connectUsingDriver, Thread.currentThread().getContextClassLoader() is null

2019-07-24 Thread Clemens Wyss DEV 
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: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: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