覆盖 Maven 捆绑包插件中的需求功能

Question

我的问题类似于这个问题，但是我使用Maven bundle插件来实现相同的最终结果。

我正在构建一个包含persistence.xml文件的捆绑包，我发现maven-bundle-plugin在清单中自动生成以下标头：

Require-Capability:osgi.service;effective:=active;objectClass=javax.persistence.spi.PersistenceProvider;javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl,
Require-Capability: osgi.extender;osgi.extender=aries.jpa, 
Require-Capability: osgi.service;effective:=active;objectClass=javax.sql.DataSource;filter:="(osgi.jndi.service.name=jdbc/test)"

这本身并不是一个问题，但是我使用的是Karaf，我想在我自己的一个功能中部署这个和其他捆绑包以及Karaf功能。当我这样做时，它失败了，因为OSGi无法实现＜code＞OSGi.service；有效：=有效；objectClass=javax.persistence.spi.PersistenceProvider；persistence.provider=org.apache.openjpa.persistency。PersistenceProviderImpl即使我指定同时安装＜code＞openjpa

为了构建我的捆绑包，我尝试了以下Maven插件配置：

<plugin>
    <groupId>org.apache.felix</groupId>
    <artifactId>maven-bundle-plugin</artifactId>
    <version>3.3.0</version>
    <extensions>true</extensions>
    <configuration>
        <instructions>
            <Export-Package>com.example
            </Export-Package>
            <Include-Resource>
                        META-INF/persistence.xml=${project.build.directory}/classes/META-INF/persistence.xml,
                        {maven-resources}
            </Include-Resource>
            <Meta-Persistence>META-INF/persistence.xml</Meta-Persistence>
            <Require-Capability>
                        osgi.service;resolution:=optional;objectClass=javax.persistence.spi.PersistenceProvider;javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl,
                        osgi.extender;resolution:=optional;osgi.extender=aries.jpa,
                        osgi.service;resolution:=optional;objectClass=javax.sql.DataSource;filter:="(osgi.jndi.service.name=jdbc/test)"
            </Require-Capability>
        </instructions>
    </configuration>
</plugin>

但是，我得到了与上述链接问题相同的问题，即清单中的重复要求。

我还从上面问题的链接中看到，对bnd进行了更改（bnd问题#1364），但这似乎只适用于注释？是否有方法配置Maven插件以防止重复的需求？

我的示例代码可在 GitHub（karaf_features 分支）上找到：https://github.com/jtkb/jpatest/tree/feature/karaf_features

它由3个模块组成，但只有2个模块是这个问题感兴趣的，< code>simple和< code>simple-datasource

< code>simple是“持久性单元”，包含< code>persistence.xml。它也是“笨拙的”(然而是真实的需求)<代码>

simple-datasource为持久性单元提供数据源，并包含一个Karaf功能，用于安装简单，简单数据源捆绑包和所有必需的第三方捆绑包（通过Karaf功能）。功能 XML 包含：

<feature name="simple-datasource" description="simple-datasource" version="1.0.0.SNAPSHOT">
    <feature version="4.1.1">jdbc</feature>
    <feature version="2.6.0">jpa</feature>
    <feature version="2.4.1">openjpa</feature>
    <feature version="1.0.1">pax-jdbc-mariadb</feature>
    <bundle>mvn:com.javatechnics.jpa/simple-datasource/1.0.0-SNAPSHOT</bundle>
    <bundle>mvn:com.javatechnics.jpa/simple/1.0.0-SNAPSHOT</bundle>
</feature>

因此，在Karaf中安装我的功能时会出现以下错误：

执行命令时出错：无法解析根：缺少要求[root]osgi。身份奥斯基。identity=简单数据源；类型=卡拉夫。特色version=“[1.0.0.快照，1.0-0.快照]”；过滤器：＝“(

[原因:无法解析simple-data source/1 . 0 . 0 . snapshot:缺少要求[simple-data source/1 . 0 . 0 . snapshot]OSGi . identity；OSGi . identity = com . Java technics . JPA . simple；type = osgi.bundle版本="[1.0.0 .快照，1.0.0 .快照]"；解决方案:=强制

[原因：无法解决com.javatechnics.jpa.simple/1.0.0.SNAPSHOT：缺少需求[com.javatechnics.jpa.simple/1.0.0.SNAPSHOT]osgi.service；ObjectClass=javax.persistence.spi.PersistenceProvider；javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl；有效：=活动]]

对我来说，这个错误几乎感觉像是一个循环引用问题，但我看不出是怎么回事。

检查< code>simple包的头:

simple (59)
-----------
Bnd-LastModified = 1513115007378
Build-Jdk = 1.8.0_144
Built-By = kerry
Created-By = Apache Maven Bundle Plugin
Manifest-Version = 1.0
Meta-Persistence = META-INF/persistence.xml
Tool = Bnd-3.2.0.201605172007

Bundle-Blueprint = OSGI-INF/blueprint/blueprint.xml
Bundle-ManifestVersion = 2
Bundle-Name = simple
Bundle-SymbolicName = com.javatechnics.jpa.simple
Bundle-Version = 1.0.0.SNAPSHOT

Export-Service = 
com.javatechnics.jpa.dao.BookServiceDao;ServiceManager=Blueprint;name=
BookServiceDao
Provide-Capability = 
osgi.service;effective:=active;objectClass=javax.persistence.EntityManagerFactory;osgi.unit.name=test,
osgi.service;effective:=active;objectClass=org.apache.aries.jpa.template.JpaTemplate;osgi.unit.name=test,
osgi.service;effective:=active;objectClass=javax.persistence.EntityManager;osgi.unit.name=test,
osgi.service;effective:=active;objectClass=org.apache.aries.jpa.supplier.EmSupplier;osgi.unit.name=test
Require-Capability = 
osgi.service;effective:=active;javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl;objectClass=javax.persistence.spi.PersistenceProvider,
osgi.extender;osgi.extender=aries.jpa,
 osgi.service;effective:=active;filter:=(osgi.jndi.service.name=jdbc/test);objectClass=javax.sql.DataSource,
osgi.ee;filter:=(&(osgi.ee=JavaSE)(version=1.5))

Export-Package = 
com.javatechnics.jpa;uses:="com.javatechnics.jpa.dao,javax.persistence";version=1.0.0,
com.javatechnics.jpa.dao;uses:=com.javatechnics.jpa;version=1.0.0
Import-Package = 
com.javatechnics.jpa,
com.javatechnics.jpa.dao,
javax.persistence;version="[1.1,2)",
org.osgi.service.blueprint;version="[1.0.0,2.0.0)"

Answer 1

如果您知道某个包(姑且称之为< code>xyz)提供了< code>PersistenceProvider服务，那么您可以编写一个额外的包来完成这项工作:

Require-Bundle: xyz; bundle-version="[...)"
Provide-Capability: osgi.service;
    objectClass=javax.persistence.spi.PersistenceProvider;
    javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl;
    effective:=active

这实质上是用一种功能来增强捆绑包 xyz，该功能将解决捆绑包中的要求，但代价是添加了一个原本无用的捆绑包。

这仍然是一种变通方法，但比从捆绑包中删除真正的需求要好。