我一直在寻找一种工具，该工具能够向您显示未使用的依赖性。我很快偶然发现了Maven命令mvn dependency:analyze。这样做的问题是，它经常检测到"未使用的"依赖关系，如果丢失，则构建失败。
这是一个优化项目的示例：
$ 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:ProjectsLogfileToolMaLogfileTooltargetclasses
[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:ProjectsLogfileToolMaLogfileToolsrctestresources
[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的二手包是：
lombok.AccessLevel
lombok.Data
lombok.Getter
lombok.Setter
通过从我的POM中删除Lombok，我通过buildig the Project
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
，没有log4j-extras，我通过运行项目
会出现以下错误log4j:ERROR Could not instantiate class [org.apache.log4j.rolling.RollingFileAppender].
java.lang.ClassNotFoundException: org.apache.log4j.rolling.RollingFileAppender
我的项目都使用了log4j和Lombok。您有一个想法如何解决此问题或从何而来？
预先感谢您
我也一直遇到了伦波克项目已被dependency:analyze标记为未使用的声明依赖项的问题。Lombok Project完成了大部分魔术编译时间，因此，大多数注释在编译后都会删除。这就是为什么Maven的依赖分析仪不认识它的原因。以及为什么它也无法检测使用SPI加载的依赖项。
我们已经通过明确告诉依赖项分析仪插件来忽略伦波克项目来解决此问题。这可以使用<usedDependency>配置选项或更细粒度的<ignoreUnusedDeclaredDependency>这样完成：
<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>
ps涉及范围：Lombok是一个编译时间依赖性，但不必在运行时（或最终进入LIB文件夹）上的类路径。provided的依赖关系指出，应存在jar以进行编译，但是在运行时，它有望由运行时环境（例如，您运行的容器）提供。由于运行时不需要Lombok，因此当您的运行时不提供LOMBOK时不会有任何问题，与您对Maven依赖声明的期望相反。