[slf4j-dev] [JIRA] Updates for SLF4J-550: JPMS 下 java.lang.ClassLoader#getResource 工作差异

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SLF4J / SLF4J-550 
JPMS 下 java.lang.ClassLoader#getResource 工作差异

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琉璃 created this issue on 26/May/22 7:57 PM
Summary:              JSPM 下 java.lang.ClassLoader#getResource 工作差异
Issue Type:           Story
Affects Versions:     2.0.0-alpha7
Assignee:             SLF4J developers list
Attachments:          2022-05-27_01-55-40.jpg
Components:           slf4j-simple
Created:              26/May/22 7:57 PM
Environment:
  版本 Windows 11 专业版
  版本 21H2
  安装日期 ‎2021-‎10-‎15
  操作系统版本 22000.675
  
  java 17 2021-09-14 LTS
  Java(TM) SE Runtime Environment (build 17+35-LTS-2724)
  Java HotSpot(TM) 64-Bit Server VM (build 17+35-LTS-2724, mixed mode, sharing)
  
   
  
  Apache Maven 3.8.4 (9b656c72d54e5bacbed989b64718c159fe39b537)
  Maven home: C:\usr\tool\apache-maven-3.8.4
  Java version: 17, vendor: Oracle Corporation, runtime: C:\usr\lib\jdk-17
  Default locale: zh_CN, platform encoding: GBK
  OS name: "windows 10", version: "10.0", arch: "amd64", family: "windows"
  
   
  
  <dependency>
   <groupId>org.slf4j</groupId>
   <artifactId>slf4j-api</artifactId>
   <version>2.0.0-alpha7</version>
  </dependency>
  
   
Priority:             Major
Reporter:             琉璃
Description:
  有如下简单测试代码:
  
  There are the following simple test codes:
  
   
  {code:java}
  package cn.test.resources;
  
  import java.net.URL;
  
  public class Main {
      public static void main(String[] args) {
          URL resource = Main.class.getClassLoader().getResource("");
          System.out.println(resource.getFile());
      }
  }
  {code}
   
  
   
  
  这是一个 maven 项目, 只有这一个文件, pom 文件仅包含 `slf4j-api` 的依赖.
  
  如果不添加 `module-info.java` 文件, 在我的计算机上, 上述代码输出: 
  
  {color:#c1c7d0}/C:/test/testJpmsResource/target/classes/{color}
  
  如果添加了 `module-info.java` 文件, 即使没有声明 `requires org.slf4j` 我会得到下面的结果:
  
  {color:#c1c7d0}file:/C:/usr/data/maven/org/slf4j/slf4j-api/2.0.0-alpha7/slf4j-api-2.0.0-alpha7.jar!/META-INF/versions/9/{color}
  
   
  
  This is a maven project. There is only one file. The POM file only contains the dependencies of 'slf4j API' 
  If you don't add ` module info Java file, on my computer, the above code output:
  
  {color:#c1c7d0}/C:/test/testJpmsResource/target/classes/{color}
  
  If you add ` module info Java file, even if it does not declare 'requires org Slf4j ` I will get the following results:
  
  {color:#c1c7d0}file:/C:/usr/data/maven/org/slf4j/slf4j-api/2.0.0-alpha7/slf4j-api-2.0.0-alpha7.jar!/META-INF/versions/9/{color}
  
   
  
   
  ----
  差异大概发生在 `jdk.internal.loader.BuiltinClassLoader#findMiscResource` ,  我的疑问是 是什么造成这种差异? , slf4j 的 `META-INF/versions/*` 的文件为什么会在这里返回? 
  
   
  
  The difference probably occurs in `jdk.internal.loader.BuiltinClassLoader#findMiscResource`, my question is:
  - What makes this difference?
  - why does slf4j's' meta-inf / versions / * 'file return here?
  
   

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 Issue deleted
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Ceki Gülcü has deleted this issue on 26/May/22 8:05 PM


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