在Java应用程序中捕获RuntimeExceptions并通过电子邮件发送它们

问题描述

我正在使用类似这样的命令在Linux服务器上启动我的应用程序

I'm starting my app on Linux server with a command like this

/usr/local/bin/jsvc \
    -home /usr/local/jdk1.8.0_111 \
    -cp /opt/myapp/myapp.jar:/opt/myapp/lib/* \
    -user myappuser \
    -outfile /opt/myapp/out.log \
    -errfile /opt/myapp/error.log \
    -pidfile /opt/myapp/myapp.pid \
    com.example.MyApp

我正在使用log4j登录我的应用，并且它具有log4j.properties中描述的自己的配置，该配置位于myapp.jar内部.

I'm using log4j for logging in my app and it has own configuration described in log4j.properties which is located inside myapp.jar.

我希望能够捕获应用程序中发生的任何异常并通过电子邮件将其发送给我.为此，我已经在log4j.properties中配置了org.apache.log4j.net.SMTPAppender.

I want to be able to catch any exception which happens in the app and to send it to me via email. I have configured org.apache.log4j.net.SMTPAppender in log4j.properties for that purpose.

但是，当前RuntimeException(例如NullPointerException)只是打印到stderr，而jsvc会重定向到error.log，而无需应用log4j格式设置模式.

But currently RuntimeException, like NullPointerException are just printed to stderr which jsvc redirects to error.log without applying log4j formatting pattern.

是否有可能或应该在没有jsvc包装程序的情况下运行该应用程序

Is it possible or should I run the app without jsvc wrapper like

nohup java -jar /opt/myapp/myapp.jar &

还是有更好的解决方案?

or is there better solution?

推荐答案

正在回答自己.只需将默认 UncaughtExceptionHandler 设置为代码入口点的开头

Answering myself. Just set default UncaughtExceptionHandler at the beginning of your code entry point

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class App {

    private static final Logger logger = LoggerFactory.getLogger(App.class);

    public static void main(String[] args) {
        Thread.setDefaultUncaughtExceptionHandler((t, e) -> logger.error(null, e));
    }

}

log4j.properties

# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=/opt/myapp/myapp.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1} - %m%n

# SMTP
log4j.appender.email=org.apache.log4j.net.SMTPAppender
log4j.appender.email.SMTPHost=yoursmtp.example.com
[email protected]
log4j.appender.email.SMTPPassword=yourpassword
[email protected]
[email protected]
log4j.appender.email.Subject=An error has happened
log4j.appender.email.BufferSize=1
log4j.appender.email.layout=org.apache.log4j.PatternLayout
log4j.appender.email.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %c{1}:%L - %m%n
log4j.appender.email.Threshold = ERROR

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