我在 Pom.xml 中添加了依赖项，但 Maven 没有启动，Maven 构建失败

Question

我需要使用 gson jar 将 POJO 文件保存到 java.为此我在 Pom.xml 中添加了它的依赖项

我的本​​地 m2 存储库中有这个 jar

但是在导入语句中我收到了这个错误

我确实更新了项目并清理了项目，但没有解决问题。

然后我通过添加外部 jar 添加了这个 jar

这样编译错误就解决了

但是当我进行 Maven 安装和 Maven 构建失败时，我得到的错误是：

Gson 的 import 语句出错。

添加更新的 pom.xml

pom.xml

<?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>
        <artifactId>parent</artifactId>
        <groupId>configurator</groupId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../parent-pom/pom.xml</relativePath>
    </parent>

    <groupId>com.csc.fs.accel.browser</groupId>
    <artifactId>com.csc.fs.accel.browser.dictionary.rest</artifactId>
    <packaging>bundle</packaging>

    <name>com.csc.fs.accel.browser.dictionary.rest Blueprint Bundle</name>
    <description>com.csc.fs.accel.browser.dictionary.rest OSGi blueprint bundle project.</description>

    <dependencies>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.csc.fs.accel.browser</groupId>
            <artifactId>com.csc.fs.accel.browser.dictionary.service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>javax.jcr</groupId>
            <artifactId>jcr</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.birt.runtime</groupId>
            <artifactId>org.eclipse.emf.common</artifactId>
        </dependency>

        <dependency>
            <groupId>org.eclipse.birt.runtime</groupId>
            <artifactId>org.eclipse.emf.ecore</artifactId>
        </dependency>

        <dependency>
            <groupId>org.eclipse.birt.runtime</groupId>
            <artifactId>org.eclipse.emf.ecore.xmi</artifactId>
        </dependency>

        <!-- <dependency>
            <groupId>org.emfjson</groupId>
            <artifactId>emfjson-jackson</artifactId>
            <version>0.9.0</version>
        </dependency> -->
      <dependency>
        <groupId>org.eclipselabs</groupId>
            <artifactId>org.eclipselabs.emfjson</artifactId>
            <version>0.8.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.csc.fs</groupId>
            <artifactId>com.csc.fs.storage.service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.csc.fs.pa</groupId>
            <artifactId>com.csc.fs.pa.common.exception</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.csc.fs.pa</groupId>
            <artifactId>com.csc.fs.pa.common.service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.csc.fs.accel</groupId>
            <artifactId>com.csc.fs.accel.etools.datadictionary.model</artifactId>
            <version>2.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.csc.fs.accel</groupId>
            <artifactId>com.csc.fs.accel.etools.common.usability.api</artifactId>
            <version>2.0.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>com.csc.fs.accel</groupId>
            <artifactId>com.csc.fs.accel.etools.common.model</artifactId>
            <version>2.1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.osgi</groupId>
            <artifactId>org.osgi.core</artifactId>
        </dependency>

         <dependency>
                <groupId>org.eclipse.xsd</groupId>
                <artifactId>xsd</artifactId>
                <version>2.2.3</version>
            </dependency>
        <dependency>
            <groupId>org.apache.cxf</groupId>
            <artifactId>cxf-rt-frontend-jaxrs</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>javax.ws.rs-api</artifactId>
        </dependency>

        <dependency>
            <groupId>com.googlecode.json-simple</groupId>
            <artifactId>json-simple</artifactId>
        </dependency>

        <dependency>
                <groupId>com.csc.fs.pa</groupId>
                <artifactId>
                    com.csc.fs.pa.allowedValue.service
                </artifactId>
                <version>0.0.1-SNAPSHOT</version>
            </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.felix</groupId>
                <artifactId>maven-bundle-plugin</artifactId>
                <version>2.3.7</version>
                <extensions>true</extensions>
                <configuration>
                    <instructions>
                        <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
                        <Bundle-Version>${project.version}</Bundle-Version>
                        <Export-Package>com.csc.fs.accel.browser.dictionary.rest*;version=${project.version}</Export-Package>
                    </instructions>
                </configuration>
            </plugin>
        </plugins>
    </build>


    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.csc.fs.accel</groupId>
                <artifactId>
                    com.csc.fs.accel.etools.datadictionary.model
                </artifactId>
                <version>2.0.0-SNAPSHOT</version>
            </dependency>
            <dependency>
                <groupId>com.csc.fs.accel</groupId>
                <artifactId>com.csc.fs.accel.etools.common.usability.api</artifactId>
                <version>2.0.0-SNAPSHOT</version>
            </dependency>
            <dependency>
                <groupId>com.csc.fs.accel</groupId>
                <artifactId>
                    com.csc.fs.accel.etools.common.model
                </artifactId>
                <version>2.1.0-SNAPSHOT</version>
            </dependency>
            <dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.7</version>
</dependency>       
</dependencies>
    </dependencyManagement>

</project>

谁能建议我缺少什么或者我应该如何解决这个错误

Answer 1

您声明了错误的依赖项。应该是

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.7</version>
</dependency>

虽然您的 groupId 是 <groupId>com.google.code.gson.gson</groupId> - 请注意最后的双 .gson。

更新：

因此，当您粘贴 POM 时，我们现在可以看到问题所在。 您在 Dependency Managemet 中而不是在 Dependencies 中给出了依赖项 (gson)。您还必须将它包含在 Dependencies 中。要了解什么是依赖管理，请阅读 mavens doc https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html