Question

我尝试了SLF4J FAQ中的简单示例：

package com.aed.tests.logging;
import org.slf4j.LoggerFactory;

public class TestLogging
{

    public TestLogging()
    {
        // TODO Auto-generated constructor stub
    }

    /**
     * @param args
     */
    public static void main(String[] args)
    {
        String s = "Hello world";
        try
        {
            Integer i = Integer.valueOf(s);
        }
        catch(NumberFormatException e)
        {
            LoggerFactory.getLogger("simplelogger").error("Failed to format {}", s, e);
            LoggerFactory.getLogger("simplelogger").error("Without parametrized string", e);

        }
    }
}

这是输出：

15:33:51,248000000 [SEVERE]simplelogger: Failed to format Hello world 
15:33:51,275000000 [SEVERE]simplelogger: Without parametrized string

我使用java.util.logging作为日志记录实现，使用以下logging.properties

# Properties file which configures the operation of the JDK
# logging facility.

# The system will look for this config file, first using
# a System property specified at startup:
#
# >java -Djava.util.logging.config.file=myLoggingConfigFilePath
#
# If this property is not specified, then the config file is
# retrieved from its default location at:
#
# JDK_HOME/jre/lib/logging.properties

# Global logging properties.
# ------------------------------------------
# The set of handlers to be loaded upon startup.
# Comma-separated list of class names.
# (? LogManager docs say no comma here, but JDK example has comma.)
handlers=java.util.logging.ConsoleHandler

# Default global logging level.
# Loggers and Handlers may override this level
.level=ALL

# Loggers
# ------------------------------------------
# Loggers are usually attached to packages.
# Here, the level for each package is specified.
# The global level is used by default, so levels
# specified here simply act as an override.
# myapp.ui.level=ALL
# myapp.business.level=CONFIG
# myapp.data.level=SEVERE

# Handlers
# -----------------------------------------

# --- ConsoleHandler ---
# Override of global logging level
java.util.logging.ConsoleHandler.level=ALL
java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
# HH:MM:ss,nanosec
 java.util.logging.SimpleFormatter.format=%1$tT,%1$tN [%4$s]%3$s: %5$s %n

我希望看到异常的堆栈跟踪。我在配置中遗漏了什么吗？我可以用SLF4J或jdk日志记录以某种方式启用异常删除跟踪吗？

编辑在“标记为重复”之后。我的问题不是“如何打印堆栈跟踪”，但是如何使用SLF4J的示例本身完成打印堆栈跟踪的工作，我仍然没有打印出堆栈跟踪。正如我所说，我使用log4j作为实现而不是java.util.logging打印出堆栈跟踪。所以这确实是java.util.logging配置错误的问题，当我发现时我给出了答案。

Answer 1

这确实是为日志记录正确配置格式化程序的问题。

作为manual says，throwable是方法格式的第6个参数。所以我在logging.properties中添加了%6$s格式：

java.util.logging.SimpleFormatter.format=%1$tT,%1$tN [%4$s]%3$s: %5$s %6$s %n

这是输出，显示堆栈跟踪：

17:29:33,314000000 [SEVERE]simplelogger: Failed to format Hello world 
java.lang.NumberFormatException: For input string: "Hello world"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:492)
    at java.lang.Integer.valueOf(Integer.java:582)
    at com.aed.tests.logging.TestLogging.main(TestLogging.java:15)

17:29:33,344000000 [SEVERE]simplelogger: Without parametrized string 
java.lang.NumberFormatException: For input string: "Hello world"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Integer.parseInt(Integer.java:492)
    at java.lang.Integer.valueOf(Integer.java:582)
    at com.aed.tests.logging.TestLogging.main(TestLogging.java:15)

Answer 2

java.lang.Exception.toString()不返回堆栈跟踪信息。来自documentation：

返回此throwable的简短描述

请参阅How can I convert a stack trace to a string?，然后记录您获得的String。

为什么没有登录异常堆栈跟踪？

2 个答案: