在春分环境中，分开的持久性单位和应用于不同的OSGI捆绑包

Question

我已经在一个单独的捆绑包中实现了一个持久单位，包括 meta-inf/persistence.xml 。现在，我想在另一个插件中使用此捆绑包。但是，我无法实例化 entityManagerFactory 。

有关文件的内容，请参见下文。

什么有效

如果我将 meta-inf/persistence.xml 放入应用程序捆绑包中，以下是返回有效的 entityManagerFactory

EntityManagerFactory emf = new PersistenceProvider().createEntityManagerFactory("de.viate.muja.dao.jpa", <properties>);

什么不起作用

上面的行产生 null 如果 persistence.xml 仅在持久性捆绑包中。

eclipselink文档是指使用OSGI服务查找

context.getServiceReferences(EntityManagerFactory.class.getName(), "(osgi.unit.name=de.viate.muja.dao.jpa)");

这也不起作用。

在双子座页面上，有一个类 entityManagerFactoryBuilder 。不知道在OSGI上下文中定义了哪里！？

我该怎么做才能获得有效的服务参考？除了已经进口的那些（见下文）以及其中包括哪些捆绑包（请参见下文）（参见2022-03）？

另外：是否可以从持久性捆绑包中导入 persistence.xml ？

持久性捆绑包-Sustest.mg

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-SymbolicName: de.viate.muja.dao.bundle
Bundle-Version: 1.0.0
DynamicImport-Package: *
Export-Package: de.viate.muja.dao;version="1.0.0";uses:="jakarta.persi
 stence,jakarta.persistence.metamodel,org.eclipse.persistence.descript
 ors.changetracking,org.eclipse.persistence.indirection,org.eclipse.pe
 rsistence.internal.descriptors,org.eclipse.persistence.internal.ident
 itymaps,org.eclipse.persistence.internal.weaving,org.eclipse.persiste
 nce.queries,org.eclipse.persistence.sessions"
Import-Package: jakarta.persistence;resolution:=optional,jakarta.persi
 stence.metamodel;resolution:=optional,java.beans;resolution:=optional
 ,java.lang;resolution:=optional,java.lang.invoke;resolution:=optional
 ,java.util;resolution:=optional,java.util.function;resolution:=option
 al,java.util.stream;resolution:=optional,org.eclipse.persistence.anno
 tations;resolution:=optional,org.eclipse.persistence.descriptors.chan
 getracking;resolution:=optional,org.eclipse.persistence.indirection;r
 esolution:=optional,org.eclipse.persistence.internal.descriptors;reso
 lution:=optional,org.eclipse.persistence.internal.identitymaps;resolu
 tion:=optional,org.eclipse.persistence.internal.jpa;resolution:=optio
 nal,org.eclipse.persistence.internal.weaving;resolution:=optional,org
 .eclipse.persistence.queries;resolution:=optional,org.eclipse.persist
 ence.sessions;resolution:=optional
Meta-Persistence: META-INF/persistence.xml
Require-Capability: osgi.ee;filter:="(&(osgi.ee=JavaSE)(version=17))"

持久束 - persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    <persistence-unit name="de.viate.muja.dao.jpa" transaction-type="RESOURCE_LOCAL">

    <class>[omitted for brevity]</class>

    <shared-cache-mode>NONE</shared-cache-mode>

    <properties>
      <property name="eclipselink.weaving" value="static"/>
    </properties>
  </persistence-unit>
</persistence>

应用程序捆绑包-Sustest.mf

Manifest-Version: 1.0
Bundle-ManifestVersion: 2
Bundle-SymbolicName: de.viate.muja.ui
Bundle-Version: 1.0.0.qualifier
Bundle-RequiredExecutionEnvironment: JavaSE-17
Bundle-ActivationPolicy: lazy
Require-Bundle: org.eclipse.osgi;bundle-version="3.17.200",
 org.osgi.service.jdbc;bundle-version="1.0.1",
 jakarta.persistence-api;bundle-version="3.0.0",
 org.eclipse.persistence.core;bundle-version="3.1.0",
 org.eclipse.persistence.asm;bundle-version="9.1.1",
 org.eclipse.persistence.jpa;bundle-version="3.1.0",
 org.eclipse.persistence.jpa.jpql;bundle-version="3.1.0",
 com.microsoft.sqlserver.mssql-jdbc;bundle-version="10.2.0",
 de.viate.muja.dao.bundle;bundle-version="1.0.0"

Answer 1

看看 aries jpa 实现 osgi jpa服务规范。