Question

我的问题与this one类似，但我使用Maven捆绑插件来实现相同的最终结果。

我正在构建一个包含persistence.xml文件的包，我发现maven-bundle-plugin会自动在清单中生成以下标题：

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)"

这本身不是问题，但是我使用的是Karaf，我想在我自己的一个功能中部署这个以及其他捆绑和Karaf功能。当我这样做时，它失败了，因为OSGi无法满足功能osgi.service;effective:=active;objectClass=javax.persistence.spi.PersistenceProvider;javax.persistence.provider=org.apache.openjpa.persistence.PersistenceProviderImpl，即使我指定同时安装openjpa功能。我发现通过将effective:=active更改为resolution:=optional

，我可以解决此问题

要构建我的软件包，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>

但是我遇到了与上述链接问题相同的问题，即清单中的重复要求。

我还从上述问题的链接中看到对bnd进行了更改（bnd issue＃1364），但这似乎仅适用于注释？有没有办法配置Maven插件以防止重复的要求？

更新＃1

我的示例代码可以在GitHub（karaf_features分支）获得： https://github.com/jtkb/jpatest/tree/feature/karaf_features

它由3个模块组成，但此问题只有2个，simple和simple-datasource

simple是'持久单元'并包含persistence.xml。它也是生成“笨拙”（但真正的要求）<Require-Capability>标题的包。

simple-datasource为持久性单元提供数据源，并包含一个Karaf功能来安装simple，simple-datasource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>

所以在Karaf中安装我的功能我收到此错误：

执行命令时出错：无法解析root：缺少需求[root] osgi.identity; osgi.identity =简单的数据源;键入= karaf.feature;版本= “[1.0.0.SNAPSHOT，1.0.0.SNAPSHOT]”; filter：=“（＆amp;（osgi.identity = simple-datasource）（type = karaf.feature）（version＆gt; = 1.0.0.SNAPSHOT）（version＆lt; = 1.0.0.SNAPSHOT））”

[由：无法解析simple-datasource / 1.0.0.SNAPSHOT：缺少需求[simple-datasource / 1.0.0.SNAPSHOT] osgi.identity; osgi.identity = com.javatechnics.jpa.simple;键入= osgi.bundle;版本= “[1.0.0.SNAPSHOT，1.0.0.SNAPSHOT]”;分辨率：=强制性

[由：无法解决com.javatechnics.jpa.simple / 1.0.0.SNAPSHOT：缺少要求[com.javatechnics.jpa.simple / 1.0.0.SNAPSHOT] osgi.service;的objectClass = javax.persistence.spi.PersistenceProvider; javax.persistence.provider = org.apache.openjpa.persistence.PersistenceProviderImpl;有效：=活性]]

对我来说这个错误几乎就像一个循环引用问题，但我看不出如何。

检查simple捆绑的标头：

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

如果您知道该捆绑包，我们称之为xyz，提供PersistenceProvider服务，那么您可以编写另一个捆绑包来执行此操作：

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

这实质上增加了捆绑xyz的功能，该功能将解决捆绑中的需求，但代价是添加一个无用的捆绑包。

这仍然是一种解决方法，但比从捆绑包中删除实际要求更好。

覆盖Maven-Bundle-Plugin

更新＃1

1 个答案: