java - OSGi:缺少要求 osgi.wiring.package

Question

我编写了一个包含 5 个模块的项目。我使用 maven 在 intellij IDEA 中创建它们，然后向所有模块添加“OSGi”框架支持。我使用 maven-bundle-plugin 来配置导出包和导入包。但是当我运行它时，总是出现错误:

org.osgi.framework.BundleException: Unable to resolve org.gxkl.launcher [12]  (R 12.0): missing requirement [org.gxkl.launcher [12](R 12.0)]    osgi.wiring.package; (osgi.wiring.package=org.gxkl.server).

启动器模块包含Bundle-Activator，org.gxkl.server包位于服务模块中。我使用类似的pom来配置模块，但只有服务模块出错。启动器中的pom文件如下:

<?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">
<parent>
    <artifactId>${parent.artifactId}</artifactId>
    <groupId>${parent.groupId}</groupId>
    <version>${parent.version}</version>
</parent>
<modelVersion>${model.version}</modelVersion>

<artifactId>launcher</artifactId>

<packaging>bundle</packaging>

<dependencies>
    ...
    <dependency>
        <groupId>${project.groupId}</groupId>
        <artifactId>service</artifactId>
        <version>${project.version}</version>
    </dependency>
    ...
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-source-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
        </plugin>

        <plugin>
            <groupId>org.apache.felix</groupId>
            <artifactId>maven-bundle-plugin</artifactId>
            <extensions>true</extensions>
            <configuration>
                <instructions>
                    <Bundle-Activator>org.gxkl.Starter</Bundle-Activator>
                    <Export-Package>
                        org.gxkl
                    </Export-Package>
                    <Import-Package>
                    <!--some packages in other modules. They work fine-->
                        ...
                        org.gxkl.server <!--packge in service modules. It doesn't work fine-->
                    </Import-Package>
                </instructions>
            </configuration>
        </plugin>
    </plugins>
</build>

服务中的pom文件如下:

<?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">
<parent>
    <artifactId>${parent.artifactId}</artifactId>
    <groupId>${parent.groupId}</groupId>
    <version>${parent.version}</version>
</parent>
<modelVersion>${model.version}</modelVersion>

<artifactId>service</artifactId>

<packaging>bundle</packaging>

<description>...</description>

<dependencies>
    ...
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-source-plugin</artifactId>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
        </plugin>

        <plugin>
            <groupId>org.apache.felix</groupId>
            <artifactId>maven-bundle-plugin</artifactId>
            <extensions>true</extensions>
            <configuration>
                <instructions>
                    <Export-Package>
                        org.gxkl.server,
                        ...
                    </Export-Package>
                    <Import-Package>
                        ...
                    </Import-Package>
                </instructions>
            </configuration>
        </plugin>
    </plugins>
</build>

Answer 1

该错误消息意味着 bundle launcher进口包org.gxkl.server但框架中没有导出该包的bundle。

顺便说一句，您可以删除 <Import-Package> POM 中的部分。不需要它们。