java 使用自定义类加载器配置 org.apache.log4j.ConsoleAppender
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Configure org.apache.log4j.ConsoleAppender with custom classloader
提问by Avner Levy
I have a java class which creates a custom classloader based on javassist class loader on start up and then run the real program class. I'm getting the following error:
我有一个 java 类，它在启动时创建一个基于 javassist 类加载器的自定义类加载器，然后运行真正的程序类。我收到以下错误：
log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a
"org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by
log4j:ERROR [javassist.Loader@6f97b10a] whereas object of type
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by
[java.net.URLClassLoader@5b414a8d].
log4j:ERROR Could not instantiate appender named "stdout".
The problem is related to the fact that one object is created by the original classloader while the other is created by the custom one.
Is there a way to resolve this error?
问题与这样一个事实有关，即一个对象是由原始类加载器创建的，而另一个是由自定义类加载器创建的。
有没有办法解决这个错误？
Thanks in advance,
Avner
提前致谢，
Avner
回答by Sola Yang
Please try to set -Dlog4j.ignoreTCL=true, hope it helps. a simular issue about log4j
请尝试设置 -Dlog4j.ignoreTCL=true，希望对您有所帮助。关于 log4j 的一个类似问题
回答by Tharinda
Add log4j.ignoreTCLin maven tomcat plugin configuration as shown in below
在maven tomcat插件配置中添加log4j.ignoreTCL如下图
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<configuration>
<port>${local.server.port}</port>
<update>true</update>
<systemProperties>
<log4j.configurationFile>${user.dir}\conf\log4j2.xml</log4j.configurationFile>
<log4j.ignoreTCL>true</log4j.ignoreTCL>
<java.util.logging.manager>org.apache.logging.log4j.jul.LogManager</java.util.logging.manager>
</systemProperties>
<contextReloadable>true</contextReloadable>
</configuration>
</plugin>
