Question

我一直在寻找一种能够向您显示未使用的家属的工具。我很快就偶然发现了maven命令mvn dependency:analyze。这样做的问题是，它经常会检测到“未使用”的依赖关系，如果丢失则会导致构建失败。

以下是优化项目的示例：

$ mvn dependency:analyze

[INFO] Building LogfileTool 0.1
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) > test-compile @ LogfileTool >>>
[INFO]
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ LogfileTool ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ LogfileTool ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 7 source files to C:\Projects\LogfileToolMa\LogfileTool\target\classes
[INFO]
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ LogfileTool ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory C:\Projects\LogfileToolMa\LogfileTool\src\test\resources
[INFO]
[INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ LogfileTool ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) < test-compile @ LogfileTool <<<
[INFO]
[INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ LogfileTool ---
[WARNING] Unused declared dependencies found:
[WARNING]    log4j:apache-log4j-extras:jar:1.2.17:compile
[WARNING]    org.projectlombok:lombok:jar:1.16.18:provided
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS

Pom.xml中的依赖项

<dependencies>

<!-- Logger -->
<dependency>
  <groupId>log4j</groupId>
  <artifactId>log4j</artifactId>
  <version>1.2.17</version>
</dependency>
<dependency>
  <groupId>log4j</groupId>
  <artifactId>apache-log4j-extras</artifactId>
  <version>1.2.17</version>
</dependency>


<!-- Generating Getter, Setter etc. -->
<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.16.18</version>
  <scope>provided</scope>
</dependency>

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.4</version>
  <type>jar</type>
</dependency>

</dependencies>

Lombok使用的包是：

lombok.AccessLevel
lombok.Data
lombok.Getter
lombok.Setter

通过从我的POM中删除lombok，我通过构建项目获得以下错误

-------------------------------------------------------------
COMPILATION ERROR : 
-------------------------------------------------------------
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[7,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[8,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[9,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[10,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[26,2] cannot find symbol
  symbol: class Data
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[13,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[14,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[15,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[16,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[26,2] cannot find symbol
  symbol: class Data
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[34,4] cannot find symbol
  symbol:   class Getter
  location: class  ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[35,4] cannot find symbol
  symbol:   class Setter
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[35,4] cannot find symbol
  symbol:   class Getter
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[36,4] cannot find symbol
  symbol:   class Setter
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[62,7] cannot find symbol
  symbol:   method setXmlToRead(java.lang.String)
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[63,7] cannot find symbol
  symbol:   method setPathToLogfiles(java.lang.String)
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[63,7] cannot find symbol
  symbol:   method setPathForStorage(java.lang.String)
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[64,7] cannot find symbol
  symbol:   method setPathToLogfile(java.lang.String)
  location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/log_handler/LogfileReader.java:[93,50] cannot find symbol
  symbol:   method getPathToLogfiles()
  location: variable logfileSearchConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/log_handler/LogfileReader.java:[95,100] cannot find symbol
  symbol:   method getXmlToRead()
  location: variable logfileSearchConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/Main.java:[61,51] cannot find symbol
  symbol:   method getPathToLogfile()
  location: variable logfileToolConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/Main.java:[71,52] cannot find symbol
  symbol:   method getPathForStorage()
  location: variable logfileToolConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
22 errors 
-------------------------------------------------------------
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 1.747 s
Finished at: 2017-09-27T10:04:20+02:00
Final Memory: 14M/210M
------------------------------------------------------------------------
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project LogfileTool: Compilation failure: Compilation failure:
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[7,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[8,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[9,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[10,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[26,2] cannot find symbol
symbol: class Data
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[13,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[14,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[15,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[16,14] package lombok does not exist
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[26,2] cannot find symbol
symbol: class Data
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[34,4] cannot find symbol
symbol:   class Getter
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[35,4] cannot find symbol
symbol:   class Setter
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[35,4] cannot find symbol
symbol:   class Getter
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[36,4] cannot find symbol
symbol:   class Setter
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[62,7] cannot find symbol
symbol:   method setXmlToRead(java.lang.String)
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileSearchConfig.java:[63,7] cannot find symbol
symbol:   method setPathToLogfiles(java.lang.String)
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[63,7] cannot find symbol
symbol:   method setPathForStorage(java.lang.String)
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/config_handler/LogfileParseConfig.java:[64,7] cannot find symbol
symbol:   method setPathToLogfile(java.lang.String)
location: class ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/log_handler/LogfileReader.java:[93,50] cannot find symbol
symbol:   method getPathToLogfiles()
location: variable logfileSearchConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/log_handler/LogfileReader.java:[95,100] cannot find symbol
symbol:   method getXmlToRead()
location: variable logfileSearchConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileSearchConfig
ch/glue/logfiletool/logfiletool/Main.java:[61,51] cannot find symbol
symbol:   method getPathToLogfile()
location: variable logfileToolConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
ch/glue/logfiletool/logfiletool/Main.java:[71,52] cannot find symbol
symbol:   method getPathForStorage()
location: variable logfileToolConfig of type ch.glue.logfiletool.logfiletool.config_handler.LogfileParseConfig
-> [Help 1]

To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.

For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

如果没有log4j-extras，我会通过运行Project

获得以下错误

log4j:ERROR Could not instantiate class [org.apache.log4j.rolling.RollingFileAppender].
java.lang.ClassNotFoundException: org.apache.log4j.rolling.RollingFileAppender

log4j和lombok都在我的Project中使用。你有一个想法如何解决这个或来自哪里？

提前谢谢

Answer 1

我也遇到过将项目Lombok标记为dependency:analyze作为Unused声明的依赖项的问题。项目Lombok完成了大部分神奇的编译时间，因此大多数注释在编译后都会被删除。这就是Maven的依赖分析器无法识别它的原因。以及为什么它也无法检测使用SPI加载的依赖项。

我们通过明确告诉Dependency分析器插件忽略Project Lombok来解决这个问题。这可以使用<usedDependency>配置选项或更精细的<ignoreUnusedDeclaredDependency>来完成：

<pluginManagement>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>3.0.2</version>
            <configuration>
                <ignoredUnusedDeclaredDependencies>
                    <ignoredUnusedDeclaredDependency>org.projectlombok:lombok</ignoredUnusedDeclaredDependency>
                </ignoredUnusedDeclaredDependencies>
            </configuration>
        </plugin>
    </plugins>
</pluginManagement>

关于范围的PS：Lombok是一个编译时依赖项，但不需要在运行时在类路径上（或者最终在你的lib文件夹中）。 provided依赖关系声明jar应该存在以进行编译，但是在运行时它应该由运行时环境（例如，运行它的容器）提供。由于在运行时不需要Lombok，因此当运行时不提供Lombok时会出现问题，这与您对Maven依赖声明的期望相反。

mvn依赖关系中的结果不正确：analyze

1 个答案: