没有模块化的Java 11：作为maven依赖项添加时，包不存在

Question

我有三个非常简单的applilcations。一个是COMMON，我将以安全配置为中心，另一个是ZUUL功能，第三个是EUREKA SERVER。两者都是Spring Boot和Java 11.虽然我使用的是Java 11，但我并不依赖于模块化（据我所知，使用Spring Boot的模块化功能是没有意义的）。

当我在Eclipse中运行所有这三个时，我成功地可以按顺序运行服务器，common和zuul。当我尝试maven构建时，我得到了主题中提到的错误。

直接的解释是“你在zuul classpath中没有共同点”。好吧，据我检查，我确实在zuul classpath中有共同点。我想知道是否有任何额外的配置，因为我使用Java 11但不使用modularaty。

通过说我使用Java 11而不是模块化我的意思是，我有Java 11，但我在三个项目中都没有module-info.java。

检查.m2文件夹并解压缩common.jar我看到该类抱怨。

Zuul项目pom：

<?xml version="1.0" encoding="UTF-8"?>
<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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>zuul</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>zuul</name>
    <description>Zuul project</description>

    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/io.jsonwebtoken/jjwt -->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.1</version>
        </dependency>

        <dependency>
            <groupId>com.test</groupId>
            <artifactId>common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

共同的证据是maven依赖

mvn clean install期间出错：

[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------------------< com.test:zuul >----------------------------
[INFO] Building zuul 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) @ zuul ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ zuul ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 2 source files to C:\_d\WSs\soteste\zuul\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[14,32] package com.test.common.security does not exist
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[21,17] cannot find symbol
  symbol:   class JwtConfig
  location: class com.test.zuul.security.SecurityTokenConfig
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[46,16] cannot find symbol
  symbol:   class JwtConfig
  location: class com.test.zuul.security.SecurityTokenConfig
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[47,23] cannot find symbol
  symbol:   class JwtConfig
  location: class com.test.zuul.security.SecurityTokenConfig
[INFO] 4 errors 
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.778 s
[INFO] Finished at: 2019-03-21T14:23:23-03:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project zuul: Compilation failure: Compilation failure: 
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[14,32] package com.test.common.security does not exist
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[21,17] cannot find symbol
[ERROR]   symbol:   class JwtConfig
[ERROR]   location: class com.test.zuul.security.SecurityTokenConfig
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[46,16] cannot find symbol
[ERROR]   symbol:   class JwtConfig
[ERROR]   location: class com.test.zuul.security.SecurityTokenConfig
[ERROR] /C:/_d/WSs/soteste/zuul/src/main/java/com/test/zuul/security/SecurityTokenConfig.java:[47,23] cannot find symbol
[ERROR]   symbol:   class JwtConfig
[ERROR]   location: class com.test.zuul.security.SecurityTokenConfig
[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

抱怨的是在罐子里

***编辑

普通的pom

<?xml version="1.0" encoding="UTF-8"?>
<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>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.test</groupId>
    <artifactId>common</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>common</name>
    <description>Zuul project</description>

    <properties>
        <java.version>11</java.version>
        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

</project>

Answer 1

那是因为公共项目是一个Spring Boot应用程序（我在生成的jar中看到了BOOT-INF文件夹）。

来自Use a Spring Boot Application as a Dependency文档：

可执行存档不能用作依赖项，因为可执行jar格式打包BOOT-INF / classes中的应用程序类。这意味着当可执行jar用作依赖项时，无法找到它们。

要生成两个工件，一个可以用作依赖项，另一个可执行，必须指定一个分类器。此分类器应用于可执行归档的名称，保留默认归档以用作依赖项。

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <configuration>
                <classifier>exec</classifier>
            </configuration>
        </plugin>
    </plugins>
</build>

这是一个例子：

第一个jar是可依赖的构建，第二个是Spring Boot可执行文件。

Answer 2

Eclipse能够解析当前打开的工作区的Eclipse项目，因为Maven依赖项到其他项目中是Eclipse的一个特色。

如果您在命令行或Eclipse中执行Maven，则离开Eclipse的范围并使用普通的Maven。 Plain Maven（即使是在Eclipse集成的Maven中）也不了解Eclipse项目，它只知道本地和配置的远程存储库中可用的工件。

因此，在您的情况下，正确的方法是首先在您的公共项目上执行mvn install。这将安装到您的本地仓库中，并使其可供Maven使用。

之后，您可以在zuul项目上执行mvn clean install。

没有模块化的Java 11：作为maven依赖项添加时，包不存在

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