依赖分析：无用依赖，循环依赖 （dependency:analyze）（一）
1. dependency:analyze
这是 maven-dependency-plugin 插件的goal
https://maven.apache.org/plugins/maven-dependency-plugin/analyze-mojo.html
使用时 mvn clean dependency:analyze
2. 依赖分析
项目示例：
.
│ pom.xml
│
│
├─z-1
│ │ pom.xml
│ │
│ │
│ └─z-11
│ │ pom.xml
│ │
│ │
│ └─src
│ └─main
│ └─java
│ Z11.java
│
└─z-2
│ pom.xml
│
│
├─z-21
│ │ pom.xml
│ │
│ │
│ └─src
│ └─main
│ └─java
│ Z21.java
│
└─z-22
│ pom.xml
│
│
└─src
└─main
└─java
Z22.java
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>cn.zno</groupId> <artifactId>z-test</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>pom</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <modules> <module>z-1</module> <module>z-2</module> </modules> </project>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>cn.zno</groupId> <artifactId>z-test</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>z-1</artifactId> <packaging>pom</packaging> <modules> <module>z-11</module> </modules> </project>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>cn.zno</groupId> <artifactId>z-test</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>z-2</artifactId> <packaging>pom</packaging> <modules> <module>z-21</module> <module>z-22</module> </modules> </project>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>cn.zno</groupId> <artifactId>z-1</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>z-11</artifactId> </project>
public class Z11 { }
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>cn.zno</groupId> <artifactId>z-2</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>z-21</artifactId> <dependencies> <dependency> <groupId>cn.zno</groupId> <artifactId>z-11</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </project>
public class Z21 { }
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>cn.zno</groupId> <artifactId>z-2</artifactId> <version>0.0.1-SNAPSHOT</version> </parent> <artifactId>z-22</artifactId> <dependencies> <dependency> <groupId>cn.zno</groupId> <artifactId>z-21</artifactId> <version>0.0.1-SNAPSHOT</version> </dependency> </dependencies> </project>
public class Z22 { private Z11 z11; private Z21 z21; }
z-test 是base pom ，其下包含两个模块z-1 和 z-2
z-1 包含一个模块 z-11
z-2 包含两个模块z-21 和 z-22
其中z-21 引入了z-11 但在java代码中未使用（UnusedDeclared）
其中z-22 引入了z-21 ，使用了z-11 的代码 （UsedUndeclared）
执行 mvn clean dependency:analyze
D:\e\workspaces\MYWORKSPACE\z-test>mvn clean dependency:analyze [INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] z-test [INFO] z-1 [INFO] z-11 [INFO] z-2 [INFO] z-21 [INFO] z-22 [INFO] [INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder wit h a thread count of 1 [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-test 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-test --- [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-test >>> [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-test <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-test --- [INFO] Skipping pom project [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-1 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-1 --- [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-1 >>> [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-1 <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-1 --- [INFO] Skipping pom project [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-11 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-11 --- [INFO] Deleting D:\e\workspaces\MYWORKSPACE\z-test\z-1\z-11\target [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-11 >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ z-11 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-1\z-11\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ z-11 --- [INFO] Compiling 1 source file to D:\e\workspaces\MYWORKSPACE\z-test\z-1\z-11\target\classes [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ z-11 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-1\z-11\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ z-11 --- [INFO] No sources to compile [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-11 <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-11 --- [INFO] No dependency problems found [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-2 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-2 --- [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-2 >>> [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-2 <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-2 --- [INFO] Skipping pom project [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-21 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-21 --- [INFO] Deleting D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-21\target [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-21 >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ z-21 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-21\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ z-21 --- [INFO] Compiling 1 source file to D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-21\target\classes [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ z-21 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-21\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ z-21 --- [INFO] No sources to compile [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-21 <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-21 --- [WARNING] Unused declared dependencies found: [WARNING] cn.zno:z-11:jar:0.0.1-SNAPSHOT:compile [INFO] [INFO] ------------------------------------------------------------------------ [INFO] Building z-22 0.0.1-SNAPSHOT [INFO] ------------------------------------------------------------------------ [INFO] [INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ z-22 --- [INFO] Deleting D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-22\target [INFO] [INFO] >>> maven-dependency-plugin:2.8:analyze (default-cli) @ z-22 >>> [INFO] [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ z-22 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-22\src\main\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:compile (default-compile) @ z-22 --- [INFO] Compiling 1 source file to D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-22\target\classes [INFO] [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ z-22 --- [INFO] Using 'UTF-8' encoding to copy filtered resources. [INFO] skip non existing resourceDirectory D:\e\workspaces\MYWORKSPACE\z-test\z-2\z-22\src\test\resources [INFO] [INFO] --- maven-compiler-plugin:2.5.1:testCompile (default-testCompile) @ z-22 --- [INFO] No sources to compile [INFO] [INFO] <<< maven-dependency-plugin:2.8:analyze (default-cli) @ z-22 <<< [INFO] [INFO] --- maven-dependency-plugin:2.8:analyze (default-cli) @ z-22 --- [WARNING] Used undeclared dependencies found: [WARNING] cn.zno:z-11:jar:0.0.1-SNAPSHOT:compile [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO] [INFO] z-test ............................................ SUCCESS [ 1.496 s] [INFO] z-1 ............................................... SUCCESS [ 0.011 s] [INFO] z-11 .............................................. SUCCESS [ 1.642 s] [INFO] z-2 ............................................... SUCCESS [ 0.013 s] [INFO] z-21 .............................................. SUCCESS [ 0.116 s] [INFO] z-22 .............................................. SUCCESS [ 0.089 s] [INFO] ------------------------------------------------------------------------ [INFO] BUILD SUCCESS [INFO] ------------------------------------------------------------------------ [INFO] Total time: 3.880 s [INFO] Finished at: 2017-08-29T17:50:30+08:00 [INFO] Final Memory: 19M/260M [INFO] ------------------------------------------------------------------------
两处红字，
第一处 z21 声明了 z11 但是没有使用z11
第二处 z22 通过 z21 的依赖传递 直接使用z11
3. 智能构建顺序
正常顺序
[INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] z-test [INFO] z-1 [INFO] z-11 [INFO] z-2 [INFO] z-21 [INFO] z-22
非正常顺序（类似创建java对象，用到了引用就去找，找到了先建父类，再建子类）
[INFO] Scanning for projects... [INFO] ------------------------------------------------------------------------ [INFO] Reactor Build Order: [INFO] [INFO] z-test [INFO] z-2 [INFO] z-21 [INFO] z-1 [INFO] z-11 [INFO] z-22
NOTE: 非正常的存在隐患，就是不会超出范围（范围内智能调整顺序），一旦范围内不存在所需依赖，同时本地仓库中有没有所需依赖，就会构建失败。
上例中z-11 依赖 z-21 , 父pom 范围包含z-test,z-1,z-2,z-11,z-21,z-22
假如 构建的pom此时换做 z-1 ,（同时清除本地repository） ，则会构建失败
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] z-1
[INFO] z-11
此处内容省略。。。
[ERROR] Failed to execute goal on project z-11: Could not resolve dependencies for project cn.zno:z-11:jar:0.
0.1-SNAPSHOT: Could not find artifact cn.zno:z-21:jar:0.0.1-SNAPSHOT -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/DependencyResolutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :z-11
如何较快速度添加 used undeclared
[WARNING] 这块的格式是固定的，写个小程序，入参是缺失的依赖列表，通过 BufferReader 读取每一行
mvn -fn -o clean dependency:analyze > E://maven.log
当模块特别多的时候，可以指定-fn （构建失败也会继续执行），可以指定 -o （离线）
4. 循环依赖
分析循环依赖之前可以通过 dependency:analyze 去除无用的
[ERROR] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='com.bull.framework:framework-entities:mfoit-latest-SNAPSHOT'}' and 'Vertex{label='com.bull.framework:framework-dmd2-generator:mfoit-latest-SNAPSHOT'}' introduces to cycle in the graph com.bull.framework:framework-dmd2-generator:mfoit-latest-SNAPSHOT --> com.bull.framework:framework-dmd2-vengine:mfoit-latest-SNAPSHOT --> com.bull.framework:framework-entities:mfoit-latest-SNAPSHOT --> com.bull.framework:framework-dmd2-generator:mfoit-latest-SNAPSHOT -> [Help 1]
com.bull.framework:framework-dmd2-generator:mfoit-latest-SNAPSHOT -->
com.bull.framework:framework-dmd2-vengine:mfoit-latest-SNAPSHOT -->
com.bull.framework:framework-entities:mfoit-latest-SNAPSHOT -->
com.bull.framework:framework-dmd2-generator:mfoit-latest-SNAPSHOT ->
