Hi,
We're having a lot of trouble getting the JDBCAppender to write to our
PostgreSQL database. There's probably a configuration error somewhere, but
we haven't been able to find it. And I have been searching and trying for
several days now, with no progress at all.
Even though we specify a connection URL in the JDNI source (see below), it
always ends with the JDBCAppender complaining that:
java.sql.SQLException: Cannot create JDBC driver of class '' for
connect URL 'null'
The Appender should write the data to our database at server "foobar",
database "logging-tst". Using the same credentials in SquirrelSQL, with
the same JDBC driver, I can connect to that database and query the table
specified in the log4j.xml (schema: "logging", table: "usage"; names being
case-insensitive).
Any pointers would be appreciated.
Environment:
- Centos 7
- Apache Tomcat 8.5.32
- log4j-2.11
We created a servlet HTTP filter into a JAR, compiled against:
WEB-INF/lib:
log4j-api-2.11.0.jar log4j-core-2.11.0.jar
servlet-api.jar
This servlet put()'s certain fields into the ThreadContext, which we then
attempt to access through %X{...} in the log4j2.xml, appending those
fields as a
row to an existing table in our database.
We had this set-up working previously with log4j-1.something in an MS SQL
'05
DB, all on Windows 2003 server (which we are migrating away from due to
performance issues).
Files within the web application:
WEB-INF/lib/
log4j-1.2-api-2.11.0.jar log4j-api-2.11.0.jar
log4j-core-2.11.0.jar log4j-jcl-2.11.0.jar log4j-jul-2.11.0.jar
log4j-slf4j-impl-2.11.0.jar log4j-web-2.11.0.jar
postgresql-jdbc.jar
META-INF/context.xml:
---------------------
<?xml version="1.0" encoding="utf-8"?>
<context>
<resource
name="jdbc/loggingtst"
auth="Container"
type="javax.sql.DataSource"
username="*****"
password="*****"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://foobar:5432/logging-tst"
maxTotal="20"
maxIdle="10"
/>
</context>
WEB-INF/classes/log4j2.xml:
---------------------------
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
...
<Appenders>
...
<JDBC name="DBAppender" tableName="logging.usage">
<DataSource jndiName="java:/comp/env/jdbc/loggingtst"/>
<Column name="servername" pattern="%X{servername}"/>
<Column name="fex" pattern="%X{focexec}"/>
<Column name="parameters" pattern="%X{parameters}"/>
<Column name="username" pattern="%X{username}"/>
<Column name="duration" pattern="%X{duration}"/>
<Column name="user_agent" pattern="%X{user-agent}"/>
</JDBC>
</Appenders>
<Loggers>
...
<Logger name="LogFilter" level="info" additivity="false">
<AppenderRef ref="DBAppender"/>
</Logger>
<Root level="error">
<AppenderRef ref="sysout" />
</Root>
</Loggers>
</Configuration>
WEB-INF/web.xml:
----------------
...
<resource-ref>
<description>PostgreSQL logging table</description>
<res-ref-name>jdbc/loggingtst</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
...
With this, catalina.out contains:
2019-12-09 17:38:16,460 localhost-startStop-1 ERROR JdbcDatabaseManager
JdbcManager{name=FexAppender, bufferSize=0, tableName=logging.usage,
columnConfigs=[{ name=servername, layout=%X{servername}, literal=null,
timestamp=false }, { name=fex, layout=%X{focexec}, literal=null,
timestamp=false }, { name=parameters, layout=%X{parameters}, literal=null,
timestamp=false }, { name=username, layout=%X{username}, literal=null,
timestamp=false }, { name=duration, layout=%X{duration}, literal=null,
timestamp=false }, { name=user_agent, layout=%X{user-agent}, literal=null,
timestamp=false }], columnMappings=[]} Could not perform database startup
operations: java.sql.SQLException: Cannot create JDBC driver of class ''
for connect URL 'null' java.sql.SQLException: Cannot create JDBC driver of
class '' for connect URL 'null'
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2186)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createDataSource(BasicDataSource.java:2066)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1525)
at
org.apache.logging.log4j.core.appender.db.jdbc.DataSourceConnectionSource.getConnection(DataSourceConnectionSource.java:51)
at
org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.startupInternal(JdbcDatabaseManager.java:85)
at
org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.startup(AbstractDatabaseManager.java:81)
at
org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.start(AbstractDatabaseAppender.java:106)
at
org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:265)
at
org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:547)
at
org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:263)
at
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:240)
at
org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:158)
at
org.apache.logging.log4j.web.Log4jWebInitializerImpl.initializeNonJndi(Log4jWebInitializerImpl.java:168)
at
org.apache.logging.log4j.web.Log4jWebInitializerImpl.start(Log4jWebInitializerImpl.java:110)
at
org.apache.logging.log4j.web.Log4jServletContainerInitializer.onStartup(Log4jServletContainerInitializer.java:57)
at
org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5245)
at
org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at
org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:754)
at
org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:730)
at
org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at
org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:629)
at
org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1839)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
at org.postgresql.Driver.parseURL(Driver.java:551)
at org.postgresql.Driver.acceptsURL(Driver.java:472)
at java.sql.DriverManager.getDriver(DriverManager.java:299)
at
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.createConnectionFactory(BasicDataSource.java:2171)
... 26 more
(Ignore below company statement)
Alban Hertroys
D: +31 (0)53 4 888 888 | T: +31 (0)53 4888 888 | E:
alban.hertr...@apollovredestein.com
Apollo Vredestein B.V.| Ir. E.L.C. Schiffstraat 370, 7547 RD Enschede, The
Netherlands
Chamber of Commerce number: 34223268
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