Olingo OData2.0 for Android-依赖于javax.xml.stream.xmlinputFactory

Question

我试图在Android中使用Apache Olingo OData2.0实现一个OData V2客户机。

E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.my.app.appname, PID: 2521
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.conurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
java.util.conurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/xml/stream/XMLInputFactory;
at org.apache.olingo.odata2.core.commons.XmlHelper.createStreamReader(XmlHelper.java:41)
org.apache.olingo.odata2.core.edm.provider.EdmxProvider.parse(EdmxProvider.java:50)
org.apache.olingo.odata2.core.ep.ProviderFacadeImpl.readMetadata(ProviderFacadeImpl.java:224)
org.apache.olingo.odata2.api.ep.EntityProvider.readMetadata(EntityProvider.java:844)
at connectivity.MyClass.doInBackground(MyClass.java:153)
at connectivity.MyClass.doInBackground(MyClass.java:38)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237) <4 more...>
Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.xml.stream.XMLInputFactory" on path: DexPathList[[zip file "/data/app/com.my.app.appname-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469) <12 more...>
Suppressed: java.lang.ClassNotFoundException: javax.xml.stream.XmlInputFactory
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.findClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 13 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

Answer 1

您必须自己重新打包javax.xml.Stream类，因为Android不支持XML。Olingo V4有一个特殊的android打包客户端，用于V4 dowload页面:http://Olingo.apache.org/doc/odata4/download.html

Olingo V2没有这个特性，因为在创建V2库时，主要关注的是服务器端的实现。这就是为什么在客户端缺少很多便利性的原因。