Question

我想使用其中一个示例to launch a FrameworkFactory。我的编译器都拒绝编译......

 Map<String,String> props=new HashMap<String,String>();
 props.put("org.osgi.framework.storage","target/osgi-store");
 props.put("org.osgi.framework.storage.clean","onFirstInit");
 FrameworkFactory factory=ServiceLoader.load(FrameworkFactory.class);
 // Type mismatch: cannot convert from ServiceLoader<FrameworkFactory> to FrameworkFactory

或者vm无法加载工厂......

ServiceLoader<FrameworkFactory> loader = ServiceLoader.load(FrameworkFactory.class);
Iterator<FrameworkFactory> iter = loader.iterator();
FrameworkFactory ff = iter.next(); // there is no "next"

这是我的pom

<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>prices.otemba.org</groupId>
<artifactId>PricesFromOtemba</artifactId>

<version>0.0.1</version>
<packaging>jar</packaging>

<properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>


<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
                <configuration>
                    <fork>true</fork>
                    <executable>C:\Program Files\Java\jdk1.8.0_60\bin\javac.exe</executable>
                </configuration>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencies>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-core-asl</artifactId>
        <version>1.9.13</version>
    </dependency>

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.13</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.5.4</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>1.2.3.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-core</artifactId>
        <version>4.0.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-web</artifactId>
        <version>4.0.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>4.1.6.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-config</artifactId>
        <version>4.0.1.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>info.cukes</groupId>
        <artifactId>cucumber-java</artifactId>
        <version>1.2.2</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>info.cukes</groupId>
        <artifactId>cucumber-junit</artifactId>
        <version>1.2.2</version>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.felix</groupId>
        <artifactId>org.apache.felix.gogo.runtime</artifactId>
        <version>0.16.2</version>
    </dependency>

    <dependency>
        <groupId>org.osgi</groupId>
        <artifactId>org.osgi.core</artifactId>
        <version>4.3.0</version>
    </dependency>

    <dependency>
        <groupId>org.apache.felix</groupId>
        <artifactId>org.osgi.core</artifactId>
        <version>1.4.0</version>
    </dependency>

</dependencies>

如果您对我的pom有一个建议，请随时提供建议。

Answer 1

以下条目：

<dependency>
    <groupId>org.osgi</groupId>
    <artifactId>org.osgi.core</artifactId>
    <version>4.3.0</version>
</dependency>

将OSGi 4.3 API添加到您的项目中（请注意，泛型工作需要4.3.1或更高版本）。这为您提供了FrameworkFactory接口，但没有要查找的服务加载程序的实现。要获得实现，您需要在运行时在类路径上拥有OSGi R4.3（或更高版本）框架。

例如，要添加Apache Felix框架R6实现（与R4.3 API向后兼容），您需要添加：

<dependency>
    <groupId>org.apache.felix</groupId>
    <artifactId>org.apache.felix.framework</artifactId>
    <version>5.0.1</version>
    <!-- You aren't compiling against Felix, just using it at runtime -->
    <scope>runtime</scope>
</dependency>

我还建议删除以下内容：

<dependency>
    <groupId>org.apache.felix</groupId>
    <artifactId>org.osgi.core</artifactId>
    <version>1.4.0</version>
</dependency>

你应该删除它的原因是它是OSGi API jar的旧版本。它不包含FrameworkFactory接口（它早于它），它将与编译路径上的OSGi 4.3 API冲突。

Answer 2

所以我的问题是关于java.util.ServiceLoader

documentation州：＆＃34;它会在您的应用程序的类路径＆＃34;中搜索服务提供商。我构建了这些例子并对该陈述产生了强烈怀疑。这些示例需要在.jar中与META-INF中的子目录进行汇编，并具有服务的完全限定名称。

在这种情况下，它将是实现org.osgi.framework.launch.FrameworkFactory的类的完全限定名称。

所以我检查了我的M2存储库，如果包org.osgi.core有这样的条目。答案是否定的。

结论：我使用的示例不适用于没有为java.util.ServiceLoader准备的包

加载OSGi FrameworkFactory需要什么样的maven依赖

2 个答案: