Question

我有这个架构

    mmsb
    |----pom.xml (packaging : pom) -> declare modules API and Utils
    |----api
    |    |----pom.xml (packaging : pom) -> declare module api-slack / parent project
    |    |----api-slack
    |         |----pom.xml (packaging : pom) -> declare module api-slack-core / parent api
    |         |----api-slack-core
    |              |----pom.xml (packaging : jar) -> java code / parent api-slack
    |----utils
    |    |----pom.xml (packaging : jar) -> java code / parent project / has dependency from api-slack-core
    |

它不起作用

从Maven干净安装说：

    ~/dev/maven-multi-sub-projets ⌚ 11:03:48
    $ mvn clean install -DskipTests

    Picked up JAVA_TOOL_OPTIONS: -javaagent:/usr/share/java/jayatanaag.jar
    [INFO] Scanning for projects...
    [INFO] ------------------------------------------------------------------------
    [INFO] Reactor Build Order:
    [INFO]
    [INFO] mmsb
    [INFO] api
    [INFO] api-slack
    [INFO] api-slack-core
    [INFO] utils
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building mmsb 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO]
    [INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ mmsb ---
    [INFO]
    [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ mmsb ---
    [INFO] Installing /home/mario/dev/maven-multi-sub-projets/pom.xml to /opt/maven/m2repo/fr/app/mmsb/1.0-SNAPSHOT/mmsb-1.0-SNAPSHOT.pom
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building api 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO]
    [INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ api ---
    [INFO]
    [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ api ---
    [INFO] Installing /home/mario/dev/maven-multi-sub-projets/api/pom.xml to /opt/maven/m2repo/fr/app/api/1.0-SNAPSHOT/api-1.0-SNAPSHOT.pom
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building api-slack 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO]
    [INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ api-slack ---
    [INFO]
    [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ api-slack ---
    [INFO] Installing /home/mario/dev/maven-multi-sub-projets/api/api-slack/pom.xml to /opt/maven/m2repo/fr/app/api-slack/1.0-SNAPSHOT/api-slack-1.0-SNAPSHOT.pom
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building api-slack-core 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO]
    [INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ api-slack-core ---
    [INFO] Deleting /home/mario/dev/maven-multi-sub-projets/api/api-slack/api-slack-core/target
    [INFO]
    [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ api-slack-core ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] Copying 0 resource
    [INFO] Copying 0 resource
    [INFO]
    [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ api-slack-core ---
    [INFO] Changes detected - recompiling the module!
    [INFO] Compiling 2 source files to /home/mario/dev/maven-multi-sub-projets/api/api-slack/api-slack-core/target/classes
    [INFO]
    [INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ api-slack-core ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] Copying 0 resource
    [INFO]
    [INFO] --- maven-compiler-plugin:3.1:testCompile (default-testCompile) @ api-slack-core ---
    [INFO] Nothing to compile - all classes are up to date
    [INFO]
    [INFO] --- maven-surefire-plugin:2.18.1:test (default-test) @ api-slack-core ---
    [INFO] Tests are skipped.
    [INFO]
    [INFO] --- maven-jar-plugin:2.6:jar (default-jar) @ api-slack-core ---
    [INFO] Building jar: /home/mario/dev/maven-multi-sub-projets/api/api-slack/api-slack-core/target/api-slack-core-1.0-SNAPSHOT.jar
    [INFO]
    [INFO] --- spring-boot-maven-plugin:1.4.2.RELEASE:repackage (default) @ api-slack-core ---
    [INFO]
    [INFO] --- maven-install-plugin:2.5.2:install (default-install) @ api-slack-core ---
    [INFO] Installing /home/mario/dev/maven-multi-sub-projets/api/api-slack/api-slack-core/target/api-slack-core-1.0-SNAPSHOT.jar to /opt/maven/m2repo/fr/app/api-slack-core/1.0-SNAPSHOT/api-slack-core-1.0-SNAPSHOT.jar
    [INFO] Installing /home/mario/dev/maven-multi-sub-projets/api/api-slack/api-slack-core/pom.xml to /opt/maven/m2repo/fr/app/api-slack-core/1.0-SNAPSHOT/api-slack-core-1.0-SNAPSHOT.pom
    [INFO]
    [INFO] ------------------------------------------------------------------------
    [INFO] Building utils 1.0-SNAPSHOT
    [INFO] ------------------------------------------------------------------------
    [INFO]
    [INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ utils ---
    [INFO] Deleting /home/mario/dev/maven-multi-sub-projets/utils/target
    [INFO]
    [INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ utils ---
    [INFO] Using 'UTF-8' encoding to copy filtered resources.
    [INFO] Copying 0 resource
    [INFO] Copying 0 resource
    [INFO]
    [INFO] --- maven-compiler-plugin:3.1:compile (default-compile) @ utils ---
    [INFO] Changes detected - recompiling the module!
    [INFO] Compiling 1 source file to /home/mario/dev/maven-multi-sub-projets/utils/target/classes
    [INFO] -------------------------------------------------------------
    [ERROR] COMPILATION ERROR :
    [INFO] -------------------------------------------------------------
    [ERROR] /home/mario/dev/maven-multi-sub-projets/utils/src/main/java/fr/app/utils/Application.java:[3,29] package fr.app.api.slack.core does not exist
    [ERROR] /home/mario/dev/maven-multi-sub-projets/utils/src/main/java/fr/app/utils/Application.java:[11,13] cannot find symbol
    symbol:   class SlackService
    location: class fr.app.utils.Application
    [INFO] 2 errors
    [INFO] -------------------------------------------------------------
    [INFO] ------------------------------------------------------------------------
    [INFO] Reactor Summary:
    [INFO]
    [INFO] mmsb ............................................... SUCCESS [  0.213 s]
    [INFO] api ................................................ SUCCESS [  0.005 s]
    [INFO] api-slack .......................................... SUCCESS [  0.004 s]
    [INFO] api-slack-core ..................................... SUCCESS [  1.558 s]
    [INFO] utils .............................................. FAILURE [  0.113 s]
    [INFO] ------------------------------------------------------------------------
    [INFO] BUILD FAILURE
    [INFO] ------------------------------------------------------------------------
    [INFO] Total time: 2.197 s
    [INFO] Finished at: 2016-12-15T11:03:52+01:00
    [INFO] Final Memory: 32M/317M
    [INFO] ------------------------------------------------------------------------
    [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project utils: Compilation failure: Compilation failure:
    [ERROR] /home/mario/dev/maven-multi-sub-projets/utils/src/main/java/fr/app/utils/Application.java:[3,29] package fr.app.api.slack.core does not exist
    [ERROR] /home/mario/dev/maven-multi-sub-projets/utils/src/main/java/fr/app/utils/Application.java:[11,13] cannot find symbol
    [ERROR] symbol:   class SlackService
    [ERROR] location: class fr.app.utils.Application
    [ERROR] -> [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/MojoFailureException
    [ERROR]
    [ERROR] After correcting the problems, you can resume the build with the command
    [ERROR]   mvn <goals> -rf :utils

如何在utils中声明api-slack-core的依赖性？

更新

我在此存储库中上传代码：https://github.com/mmaryo/mmsb

问题是我在fr.app.utils.Application里面导入fr.app.api.slack.core.SlackService

更新2

我发现了问题，我删除了：

        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>

Answer 1

这里很少 -

在父 pom级别（project），为什么还要声明parent？

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
</parent>

也是

<packaging>pom</packaging>

以及为什么你有

<module>api-slack</module>
<module>api-slack-core</module>

如果他们应该在api范围内分层次地 - > api-slack - ＆gt; api-slack-core。作为改进，请在module级别内移出project。

然后在 Api 级别，我怀疑Api目前是否正在使用不正确的父名称构建 -

<parent>
    <groupId>fr.app</groupId>
    <artifactId>vishnou</artifactId> <!-- modified -->
    <version>1.0-SNAPSHOT</version>
</parent>

Api-slack 似乎很好。

Api-slack-core 可以摆脱多余的空白

<dependencies></dependencies>

并指定plugin的版本（除非已在任何父poms中定义）为 -

<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <version>x.y.z</version>
</plugin>

进一步 Utils 可以使用Api-slack-core作为依赖项，也请更改

<groupId>fr.app</groupId>
<artifactId>utils</artifactId> <!--changed-->

总的来说，我建议您按照multi module example的建议来完成guide。

Answer 2

尝试运行// creates a tree from a flat set of hierarchically related data var MiracleGrow = function(treeData, key, parentKey) { var keys = []; treeData.map(function(x){ x.Children = []; keys.push(x[key]); }); var roots = treeData.filter(function(x){return keys.indexOf(x[parentKey])==-1}); var nodes = []; roots.map(function(x){nodes.push(x)}); while(nodes.length > 0) { var node = nodes.pop(); var children = treeData.filter(function(x){return x[parentKey] == node[key]}); children.map(function(x){ node.Children.push(x); nodes.push(x) }); } if (roots.length==1) return roots[0]; return roots; } // demo/test data var treeData = [ {id:9, name:'Led Zep', parent:null}, {id:10, name:'Jimmy', parent:9}, {id:11, name:'Robert', parent:9}, {id:12, name:'John', parent:9}, {id:8, name:'Elec Gtr Strings', parent:5}, {id:1, name:'Rush', parent:null}, {id:2, name:'Alex', parent:1}, {id:3, name:'Geddy', parent:1}, {id:4, name:'Neil', parent:1}, {id:5, name:'Gibson Les Paul', parent:2}, {id:6, name:'Pearl Kit', parent:4}, {id:7, name:'Rickenbacker', parent:3}, {id:100, name:'Santa', parent:99}, {id:101, name:'Elf', parent:100}, ]; var root = MiracleGrow(treeData, "id", "parent") console.log(root)？其中mvn clean install -pl Utils -am是父pom中模块的名称。

Maven Reactor应该自己找出依赖关系 - 你只需要放置依赖关系的GAV（groupid，artifactid，version）。

子多模块的Maven依赖

2 个答案: