0
我已经在Spring配置中定义了一个数据源。log4j2 JDBCAppender with spring
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/db" />
<property name="username" value="root" />
<property name="password" value="password" />
</bean>
对于LOG4J2 JDBCAppender，我知道我们需要获得数据源：
<JDBC name="databaseAppender" tableName="error_log">
<ConnectionFactory class="net.example.db"
method="getDatabaseConnection" />
<Column name="EVENT_DATE" isEventTimestamp="true" />
<Column name="LEVEL" pattern="%level" />
<Column name="LOGGER" pattern="%logger" />
<Column name="MESSAGE" pattern="%message" />
<Column name="THROWABLE" pattern="%ex{full}" />
</JDBC>
我已经添加了封装成组件扫描：
<context:component-scan base-package="com.test,net.example.db" />
而在添加注释作为组件的类ConnectionFactory
import java.sql.Connection;
import javax.sql.DataSource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
public class ConnectionFactory {
@Autowired
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
public Connection getDatabaseConnection() throws Exception {
return dataSource.getConnection();
}
}
不过，我得到空当调用getDatabaseConnection（）
2017-01-14 14:17:24,579 localhost-startStop-1 ERROR JdbcDatabaseManager jdbcManager{ description=databaseAppender, bufferSize=0, connectionSource=factory{ public static java.sql.Connection net.example.db.ConnectionFactory.getDatabaseConnection() }, tableName=error_log, columns=[ { name=EVENT_DATE, layout=null, literal=null, timestamp=true }, { name=LEVEL, layout=%level, literal=null, timestamp=false }, { name=LOGGER, layout=%logger, literal=null, timestamp=false }, { name=MESSAGE, layout=%message, literal=null, timestamp=false }, { name=THROWABLE, layout=%ex{full}, literal=null, timestamp=false } ] } Could not perform database startup operations: java.sql.SQLException: Failed to obtain connection from factory method. java.sql.SQLException: Failed to obtain connection from factory method.
at org.apache.logging.log4j.core.appender.db.jdbc.FactoryMethodConnectionSource$1.getConnection(FactoryMethodConnectionSource.java:107)
at org.apache.logging.log4j.core.appender.db.jdbc.FactoryMethodConnectionSource.getConnection(FactoryMethodConnectionSource.java:53)
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.startupInternal(JdbcDatabaseManager.java:60)
at org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.startup(AbstractDatabaseManager.java:65)
at org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.start(AbstractDatabaseAppender.java:89)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:255)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:530)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:258)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:239)
at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:158)
at org.apache.logging.log4j.web.Log4jWebInitializerImpl.initializeNonJndi(Log4jWebInitializerImpl.java:168)
at org.apache.logging.log4j.web.Log4jWebInitializerImpl.start(Log4jWebInitializerImpl.java:110)
at org.apache.logging.log4j.web.Log4jServletContainerInitializer.onStartup(Log4jServletContainerInitializer.java:57)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5604)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.apache.logging.log4j.core.appender.db.jdbc.FactoryMethodConnectionSource$1.getConnection(FactoryMethodConnectionSource.java:105)
... 20 more
我怀疑是否bean的数据源尚未建立时LOGJ2调用getDatabaseConnection（）。请让我知道是什么原因和解决方案。
为什么不？是的，你可以提供连接工厂类是组件扫描的一部分，并创建它的一个bean。 – Barath
嗨，Barath，请在帖子中看到我的更新。我已经实现了你提到的要点，但是我得到了dataSource的空值。 – user2051823
ConnectionFactory的软件包名称是什么。确保它是组件扫描基础软件包的一部分 – Barath