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在谷歌应用引擎上使用log4j

log4j google-app-engine java

newbie · 技术社区 · 16 年前

我需要在应用程序中使用log4j,但我不知道如何加载属性。deafult属性文件说我应该把log4j.properties放到/web-inf/classes/folder中,但是在Eclipse中,我看不到这个文件夹,也无法创建它,因为它已经存在了。我也不能向那个文件夹添加任何文件。

以下是我得到的错误:

log4j:WARN No appenders could be found for logger (DataNucleus.ClassLoading).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

那么,如何让Web应用程序加载log4j属性呢?

5 回复 | 直到 16 年前

dgeske 16 年前

SpringSource Tool Suite

OhadR 12 年前

Eclipse with the Google plugin

<system-properties> 
  <property name="java.util.logging.config.file" value="WEB-INF/classes/log4j.properties"/> 
</system-properties>

import org.apache.log4j.Logger; 
... 
Logger logger = Logger.getLogger("com.foo"); 
logger.debug("Yay2!");

log4j.rootLogger=DEBUG, stdout 
log4j.appender.stdout=org.apache.log4j.ConsoleAppender 
log4j.appender.stdout.Target=System.out 
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout 
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %t %c{1}:%M:%L - %m%n

com.google.appengine.archetypes:guestbook-archetype

<dependency> 
<groupId>log4j</groupId> 
<artifactId>log4j</artifactId> 
<version>1.2.16</version> 
</dependency>

<%@ page import="org.apache.log4j.Logger" %> 
... 
<% 
Logger logger = Logger.getLogger("com.foo"); 
logger.debug("Yay2!"); 
%>

mvn clean 
mvn verify 
mvn appengine:devserver

http://localhost:8080/

Rafael Sanches 13 年前

<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener> 
<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/log4j.properties</param-value>
</context-param>

Rafael Sanches 13 年前

public class CustomXmlWebApplicationContext extends XmlWebApplicationContext {
@Override
protected void initBeanDefinitionReader(XmlBeanDefinitionReader beanDefinitionReader) {
    super.initBeanDefinitionReader(beanDefinitionReader);

    try {
        Resource res = beanDefinitionReader.getResourceLoader().getResource("classpath:log4j.properties");
        Properties props = new Properties();
        props.load(res.getInputStream());
        PropertyConfigurator.configure(props);
    }
    catch(Throwable e) {
        e.printStackTrace();
    }
}

naXa stands with Ukraine 11 年前

Logging in the Google AppEngine for Java (GAE/J) with Slf4j, Log4j and JUL

\src\main\webapp\WEB-INF\appengine-web.xml

<!-- Configure java.util.logging -->
<system-properties>
    <property name="java.util.logging.config.file" value="WEB-INF/java-util-logging.properties"/>
</system-properties>

\src\main\webapp\WEB-INF\java-util-logging.properties

.level = ALL

\src\main\resources\log4j.properties

log4j.rootLogger=ALL, stdout
# or a lower log level such as DEBUG, INFO or WARN. 

# Define the destination and format of our logging
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%-5p: %m  at %C.(%F:%L) on %d{ISO8601}%n

Gradle

configurations {
    all*.exclude group: "commons-logging", module: "commons-logging"
}

dependencies {
    // Logging
    compile 'org.slf4j:slf4j-api:1.7.+'
    runtime 'org.slf4j:slf4j-jdk14:1.7.+'
    runtime ('log4j:log4j:1.2.17') {
        exclude group: "com.sun.jdmk", module: "jmxtools"
        exclude group: "com.sun.jmx", module: "jmxri"
        exclude group: "javax.mail", module: "mail"
        exclude group: "javax.jms", module: "jms"
    }    
}

<!-- The definition of the Log4j Configuration -->
<listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>/WEB-INF/log4j.properties</param-value>
</context-param>