Question

我的类LoggerInitializer具有方法：

public static void initLogger() {
    try {
        LogManager
                .getLogManager()
                .readConfiguration(
                Service.class.getResourceAsStream("/logging.properties"));
    } catch (IOException e) {
        System.err.println("Could not setup logger configuration: " + e.toString());
    }
}

当我在具有方法

的类中开始测试时

@BeforeClass
public static void initEnvironment() {
    LoggerInitializer.initLogger();
}

遇到错误

java.lang.NullPointerException
    at java.util.Properties$LineReader.readLine(Properties.java:434)
    at java.util.Properties.load0(Properties.java:353)
    at java.util.Properties.load(Properties.java:341)
    at java.util.logging.LogManager.readConfiguration(LogManager.java:1409)
    at com.netcracker.edu.inventory.LoggerInitializer.initLogger(LoggerInitializer.java:23)
    at com.netcracker.edu.inventory.model.impl.BatteryTest.initEnvironment(BatteryTest.java:18)
    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:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

这些错误的原因可能是什么？如何解决此问题？

Answer 1

您的文件位于com包中，因此应该为

Service.class.getResourceAsStream("/com/logging.properties")

更改该文件或将该文件移到更高一级。此外，应将它（不是必须的，但是一种很好的做法）放置在资源目录中，这样它就不会与源代码混合在一起（但是在生成的jar中效果是相同的）。

Answer 2

在src / resource文件夹中

在名称为 Log4j.properties 的文件中粘贴以下代码。

# DEFAULT FILE OUTPUT IS IN USER'S HOME DIRECTORY.
log4j.rootLogger=DEBUG, Appender1,Appender2
log4j.appender.Appender1=org.apache.log4j.ConsoleAppender
log4j.appender.Appender1.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender1.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n
log4j.appender.Appender2=org.apache.log4j.FileAppender
log4j.appender.Appender2.File=log.txt
log4j.appender.Appender2.layout=org.apache.log4j.PatternLayout
log4j.appender.Appender2.layout.ConversionPattern=%-7p %d [%t] %c %x - %m%n

为log4j添加依赖项

<dependency>
  <groupId>log4j</groupId> 
  <artifactId>log4j</artifactId> 
  <version>1.2.17</version> 
</dependency>

将其导入您的班级

import org.apache.log4j.Logger;

在您的班级中创建记录器

Logger logger = Logger.getLogger(className.class);
logger.info("Http Image is converted into Byte Array");

从属性文件配置记录器

2 个答案: