来自片段的约束与主机冲突

Question

我正在尝试使用Fragment-Host从包B扩展包A的导入。在包B中，我有一行: Fragment-Host：，在包B的Import-Package中，我添加了包A所需的导入

当我尝试使用清单更新包B并启动它时，我得到了错误："Constraints from the fragment conflict with the host“，其中包含包B中存在的所有导入的列表。但是，在检查包A的清单时，如果这些导入不存在于包A中，我不明白为什么这些导入应该冲突

值得一提的是，我在OSGi容器中只运行了两个包的一个版本，并且我已经尝试在更新后重新启动容器。

捆绑包A清单：

Manifest-Version: 1.0
Archiver-Version: Plexus Archiver
Created-By: Apache Maven
Built-By: hudson
Build-Jdk: 1.6.0_20
Export-Package: <list of packages>
Tool: Bnd-0.0.311
Bundle-Name: Logging infrastructure
Bundle-RequiredExecutionEnvironment: JavaSE-1.6
Bundle-Version: 0.7.0
Bundle-ManifestVersion: 2
Bundle-Activator: <activator class>
Bundle-SymbolicName: com.mycomp.bundlea
Import-Package: com.sap.tc.logging,org.apache.commons.logging,org.apac
 he.log4j,org.apache.log4j.helpers,org.apache.log4j.spi,org.apache.log
 4j.xml,org.eclipse.osgi.framework.console;version="1.0",org.osgi.fram
 ework;version="1.5",org.osgi.service.cm;version="1.2",org.osgi.servic
 e.log;version="1.3",org.osgi.util.tracker;version="1.4"
Eclipse-RegisterBuddy: com.sap.org.apache.log4j

捆绑包B清单：

    Manifest-Version: 1.0
Export-Package: org.perf4j;uses:="org.perf4j.chart,org.perf4j.helpers"
 ,org.perf4j.aop;uses:="javax.interceptor,org.apache.commons.jexl,org.
 aspectj.lang,org.aspectj.lang.annotation,org.perf4j",org.perf4j.chart
 ;uses:="org.perf4j,org.perf4j.helpers",org.perf4j.commonslog;uses:="o
 rg.apache.commons.logging,org.perf4j",org.perf4j.commonslog.aop;uses:
 ="org.aspectj.lang.annotation,org.perf4j,org.perf4j.aop,org.perf4j.co
 mmonslog",org.perf4j.helpers;uses:="javax.management,org.perf4j",org.
 perf4j.javalog;uses:="org.perf4j",org.perf4j.javalog.aop;uses:="org.a
 spectj.lang.annotation,org.perf4j,org.perf4j.aop,org.perf4j.javalog",
 org.perf4j.log4j;uses:="javax.management,org.apache.log4j,org.apache.
 log4j.helpers,org.apache.log4j.spi,org.perf4j,org.perf4j.chart,org.pe
 rf4j.helpers",org.perf4j.log4j.aop;uses:="org.aspectj.lang.annotation
 ,org.perf4j,org.perf4j.aop,org.perf4j.log4j",org.perf4j.log4j.servlet
 ;uses:="org.perf4j.chart,org.perf4j.servlet",org.perf4j.servlet;uses:
 ="javax.servlet,javax.servlet.http,org.perf4j.chart",org.perf4j.slf4j
 ;uses:="org.perf4j,org.slf4j",org.perf4j.slf4j.aop;uses:="org.aspectj
 .lang.annotation,org.perf4j,org.perf4j.aop,org.perf4j.slf4j"
Implementation-Title: Perf4J
Implementation-Version: 0.9.13
Built-By: devinea
Specification-Vendor: perf4j.org
Tool: Bundlor 1.0.0.RELEASE
Created-By: Apache Maven
Implementation-Vendor: perf4j.org
Implementation-Vendor-Id: org.perf4j
Build-Jdk: 1.5.0_22
Specification-Title: Perf4J
Import-Package: javax.interceptor,javax.management,javax.servlet,javax
 .servlet.http,org.apache.commons.jexl,org.apache.commons.jexl.context
 ,org.apache.commons.logging,org.apache.log4j,org.apache.log4j.helpers
 ,org.apache.log4j.spi,org.aspectj.lang,org.aspectj.lang.annotation,or
 g.slf4j,org.perf4j.log4j
Specification-Version: 0.9.13
Main-Class: org.perf4j.LogParser
Archiver-Version: Plexus Archiver
Bundle-SymbolicName: org.codehaus.perf4j
Bundle-Version: 0.9.13
Fragment-Host: com.mycomp.bundlea

有什么想法...？

Answer 1

约束冲突很难远程诊断，特别是因为Equinox在其错误消息中提供的信息很少……Felix在这方面做得更好，但它看起来像是使用一些Eclipse特定的扩展头将您绑定到Equinox。

有关一些一般性的提示和对问题的解释，请参阅我前段时间写的以下两篇博客文章：

http://njbartlett.name/2011/09/02/uses-constraints.html

http://njbartlett.name/2011/03/31/uses-constraints-in-felix.html