OSGI：maven wrapped bundle如果尝试访问另一个包装的bundle，则会抛出java.lang.ClassNotFoundException

问题描述 投票：2回答：1

由于以下依赖项不是OSGI准备好，我将它们包装如下：

  <bundle>wrap:mvn:com.google.maps/google-maps-services/0.9.2</bundle>
  <bundle>wrap:mvn:com.squareup.okhttp3/okhttp/3.13.1</bundle>

好像我的第一个捆绑包无法访问第二个捆绑包，虽然我将其包含在我的导入中，如下所示：

<Import-Package>okhttp3,*</import-Package>

我正进入（状态 ：

Caused by: java.lang.NoClassDefFoundError: okhttp3/Authenticator
    at com.google.maps.GeoApiContext$Builder.<init>(GeoApiContext.java:318)
    at com.elavon.nabsd.creditsafe.beans.GooglePlacesAPIContext.<clinit>(GooglePlacesAPIContext.java:11)
    at com.elavon.nabsd.creditsafe.beans.AddressParser.getAddress(AddressParser.java:35)
    at com.elavon.nabsd.creditsafe.beans.AddressParser.dummyResponse(AddressParser.java:76)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:408)
    at org.apache.camel.component.bean.MethodInfo$1.doProceed(MethodInfo.java:279)
    at org.apache.camel.component.bean.MethodInfo$1.proceed(MethodInfo.java:252)
    ... 13 more
Caused by: java.lang.ClassNotFoundException: okhttp3.Authenticator not found by wrap_mvn_com.google.maps_google-maps-services_0.9.2 [1180]
    at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1556)
    at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:77)
    at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1993)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 24 more

表现

Manifest-Version: 1.0
Bnd-LastModified: 1552097042208
Build-Jdk: 1.8.0_181
Built-By: c041356
Bundle-Blueprint: OSGI-INF/blueprint/address-parser-blueprint.xml
Bundle-Description: XXX
Bundle-DocURL: XXX
Bundle-ManifestVersion: 2
Bundle-Name: XXX
Bundle-SymbolicName: address-parser
Bundle-Vendor: XXX
Bundle-Version: 1.0.24
Created-By: Apache Maven Bundle Plugin
DynamicImport-Package: *
Export-package: com.squareup.okhttp3,okhttp3
Import-Package: okhttp3,com.fasterxml.jackson.annotation,com.google.maps
 ,com.google.maps.errors,com.google.maps.model,org.apache.camel.componen
 t.jasypt,org.jasypt.encryption.pbe.config,org.osgi.service.blueprint;ve
 rsion="[1.0.0,2.0.0)",org.slf4j,org.apache.camel.component.http4,org.ap
 ache.camel.component.jackson,com.squareup.okhttp3
Require-Capability: osgi.ee;filter:="(&(osgi.ee=JavaSE)(version=1.8))"
Tool: Bnd-3.0.0.201509101326

wrap_mvn_com.squareup.okhttp3_okhttp_3.13.1 (1202)
--------------------------------------------------
Originally-Created-By = Apache Maven 3.6.0
Created-By = 1.8.0_181 (Oracle Corporation)
Manifest-Version = 1.0
Bnd-LastModified = 1552095323499
Generated-By-Ops4j-Pax-From = wrap:mvn:com.squareup.okhttp3/okhttp/3.13.1
Build-Jdk = 1.8.0_162
Built-By = jwilson
Automatic-Module-Name = okhttp3
Tool = Bnd-2.3.0.201405100607

Bundle-ManifestVersion = 2
Bundle-SymbolicName = wrap_mvn_com.squareup.okhttp3_okhttp_3.13.1
Bundle-Version = 0
Bundle-Name = wrap_mvn_com.squareup.okhttp3_okhttp_3.13.1

Require-Capability =
        osgi.ee;filter:=(&(osgi.ee=JavaSE)(version=1.8))

Export-Package =
        okhttp3;uses:="javax.annotation,javax.net,javax.net.ssl,okio",
        okhttp3.internal;uses:="javax.annotation,javax.net.ssl,okhttp3,okhttp3.internal.cache,okhttp3.internal.connection,okhttp3.internal.http,okhttp3.internal.http2,okio",
        okhttp3.internal.annotations;uses:="javax.annotation,javax.annotation.meta",
        okhttp3.internal.cache;uses:="javax.annotation,okhttp3,okhttp3.internal.io,okio",
        okhttp3.internal.cache2,
        okhttp3.internal.connection;uses:="javax.annotation,javax.net.ssl,okhttp3,okhttp3.internal.http,okhttp3.internal.http2,okhttp3.internal.ws",
        okhttp3.internal.duplex,
        okhttp3.internal.http;uses:="javax.annotation,okhttp3,okhttp3.internal.connection,okio",
        okhttp3.internal.http1;uses:="okhttp3,okhttp3.internal.connection,okhttp3.internal.http,okio",
        okhttp3.internal.http2;uses:="okhttp3,okhttp3.internal.connection,okhttp3.internal.http,okio",
        okhttp3.internal.io;uses:=okio,
        okhttp3.internal.platform;uses:="javax.annotation,javax.net.ssl,okhttp3,okhttp3.internal.tls",
        okhttp3.internal.proxy,
        okhttp3.internal.publicsuffix,
        okhttp3.internal.tls;uses:=javax.net.ssl,
        okhttp3.internal.ws;uses:="javax.annotation,okhttp3,okio"
Import-Package =
        android.os;resolution:=optional,
        android.util;resolution:=optional,
        javax.annotation;resolution:=optional,
        javax.annotation.meta;resolution:=optional,
        javax.net;resolution:=optional,
        javax.net.ssl;resolution:=optional,
        javax.security.auth.x500;resolution:=optional,
        okio;resolution:=optional,

wrap_mvn_com.google.maps_google-maps-services_0.9.2 (1180)
----------------------------------------------------------
Created-By = 1.8.0_181 (Oracle Corporation)
Manifest-Version = 1.0
Bnd-LastModified = 1552091296783
Generated-By-Ops4j-Pax-From = wrap:mvn:com.google.maps/google-maps-services/0.9.2
Tool = Bnd-2.3.0.201405100607

Bundle-ManifestVersion = 2
Bundle-SymbolicName = wrap_mvn_com.google.maps_google-maps-services_0.9.2
Bundle-Version = 0
Bundle-Name = wrap_mvn_com.google.maps_google-maps-services_0.9.2

Require-Capability =
        osgi.ee;filter:=(&(osgi.ee=JavaSE)(version=1.8))

Export-Package =
        com.google.maps;uses:="com.google.gson,com.google.maps.errors,com.google.maps.internal,com.google.maps.model,okhttp3",
        com.google.maps.errors,
        com.google.maps.internal;uses:="com.google.appengine.api.urlfetch,com.google.gson,com.google.gson.stream,com.google.maps,com.google.maps.errors,com.google.maps.model,okhttp3",
        com.google.maps.internal.ratelimiter,
        com.google.maps.model;uses:=com.google.maps.internal
Import-Package =
        com.google.appengine.api.urlfetch;resolution:=optional,
        com.google.gson;resolution:=optional,
        com.google.gson.stream;resolution:=optional,
        javax.crypto;resolution:=optional,
        javax.crypto.spec;resolution:=optional,
        okhttp3;resolution:=optional,
        okio;resolution:=optional,
        org.slf4j;resolution:=optional
osgi apache-karaf apache-felix osgi-bundle jbossfuse
1个回答
1
投票

包装捆绑包将自动发现的包依赖关系称为“可选”，因为在使用捆绑包提供的特定功能时，无法可靠地判断是否实际需要某个特定包。

因此，在捆绑解析时存在其他捆绑包及其导出的包确定了哪些包实际上对已解析的包裹捆绑包的已创建的类加载器可见。

在您的情况下，包“okhttp3”导出的包在解析包“google-maps”时搜索解压缩可用包时不可用。

这反过来意味着你需要确保：

  1. 解析捆绑“google-maps”时解析器可以看到“okhttp3”包
  2. 确保所需的包导入不是“可选的”

虽然第一个选项可能看起来更容易，但第二个选项更可靠，更灵活。

wrap: protocol支持覆盖生成的OSGi标头，以便您可以根据需要指定详细信息。在我们的例子中，它将是：

<bundle>wrap:mvn:com.google.maps/google-maps-services/0.9.2$overwrite=merge&amp;Import-Package=okhttp3,okio,*;resolution:=optional</bundle>

（未经测试，仅基于文档）

注意

在使用wrap协议之前，请查看所需的库是否已被其他项目OSGi所支持。一个非常好的开始是看看Apache ServiceMix项目提供的Bundles（它提供了一个okhttp3 Bundle）：

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