android - 在 google app engine datastore 中保存 android 应用程序数据时出现异常

标签 android google-app-engine jdo

下面提到的方法是我的实体端点类中的一个方法:- 

@ApiMethod(name = "insertEventEntity")
public EventEntity insertEventEntity(EventEntity eventEntity) {

    PersistenceManagerFactory pmfInstance =
            JDOHelper.getPersistenceManagerFactory("transactions-optional");

    PersistenceManager pm = pmfInstance.getPersistenceManager();


    Logger log = Logger.getLogger(EventEntityEndpoint.class.getName());

    log.info("pm="+pm);

    EventEntity event = new EventEntity("First", "First", "18/7/2015", "6:00", "18/7/2015", "7:00");

    try
    {
        pm.makePersistent(event);

        log.info("event="+event);
    }
    finally
    {
        pm.close();
    }

    return event
}

下面提到的代码是调用上述方法的代码:- 

@Override
protected String doInBackground(Void... params)
{

    EventEntityApi.Builder builder = new EventEntityApi.Builder(AndroidHttp.newCompatibleTransport(), new AndroidJsonFactory(), null).setRootUrl("https://minote-997.appspot.com/_ah/api/");
                // end of optional local run code

    EventEntity eventEntity = new EventEntity();

    EventEntityApi eventApi = builder.build();

    try
    {
        System.out.println("inserting events");

        EventEntityApi.InsertEventEntity insertEventEntity = eventApi.insertEventEntity(eventEntity);

        insertEventEntity.execute();

        System.out.println("inserting events1");
    }
    catch(IOException exception)
    {
        System.out.println("IoException ="+exception.getStackTrace());
    }
    return "Success";
}

上面提到的方法 insertEventEntity() 被调用，但我在谷歌开发者控制台 -> 监控 -> 日志中收到一些错误日志。完整的异常堆栈跟踪如下:- 

I 13:22:12.038 org.datanucleus.PersistenceConfiguration setProperty: Property datanucleus.appengine.singletonPMFForName unknown - will be ignored
I 13:22:12.039 org.datanucleus.PersistenceConfiguration setProperty: Property datanucleus.appengine.autoCreateDatastoreTxns unknown - will be ignored
I 13:22:12.040 org.datanucleus.PersistenceConfiguration setProperty: Property datanucleus.appengine.datastoreReadConsistency unknown - will be ignored
I 13:22:13.337 org.datanucleus.api.jdo.NucleusJDOHelper getJDOExceptionForNucleusException: Exception thrown
  There is no available StoreManager of type "appengine". Make sure that you have put the relevant DataNucleus store plugin in your CLASSPATH and if defining a connection via JNDI or DataSource you also need to provide persistence property "datanucleus.storeManagerType"
  org.datanucleus.exceptions.NucleusUserException: There is no available StoreManager of type "appengine". Make sure that you have put the relevant DataNucleus store plugin in your CLASSPATH and if defining a connection via JNDI or DataSource you also need to provide persistence property "datanucleus.storeManagerType"
    at org.datanucleus.NucleusContext.createStoreManagerForProperties(NucleusContext.java:506)
    at org.datanucleus.NucleusContext.initialise(NucleusContext.java:288)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:660)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:326)
    at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:195)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:167)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:164)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:125)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:45)
    at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)
    at com.google.apphosting.runtime.security.shared.intercept.java.security.AccessController_.doPrivileged(AccessController_.java:63)
    at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)
    at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1166)
    at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
    at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1093)
    at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:919)
    at com.gp.app.minote.backend.entities.EventEntityEndpoint.insertEventEntity(EventEntityEndpoint.java:59)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:167)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:164)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:125)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:45)
    at com.google.api.server.spi.SystemService.invokeServiceMethod(SystemService.java:359)
    at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:160)
    at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:59)
    at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:49)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:257)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:482)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:437)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:444)
    at com.google.tracing.CurrentContext.runInContext(CurrentContext.java:230)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:308)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:300)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:441)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:234)
    at java.lang.Thread.run(Thread.java:745)

我还在 android studio 中附加了我的外部库的图像:-

External libraries required for google app engine data store and jdo

另请在/webapp/WEB-INF/classes/META-INF 文件夹中找到附加的 jdoconfig.xml 文件:- 

<?xml version="1.0" encoding="utf-8"?>
<jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/jdoconfig">

    <persistence-manager-factory name="transactions-optional">
        <property name="javax.jdo.PersistenceManagerFactoryClass"
            value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"/>
        <property name="javax.jdo.option.ConnectionURL" value="appengine"/>
        <property name="javax.jdo.option.NontransactionalRead" value="true"/>
        <property name="javax.jdo.option.NontransactionalWrite" value="true"/>
        <property name="javax.jdo.option.RetainValues" value="true"/>
        <property name="datanucleus.appengine.autoCreateDatastoreTxns" value="true"/>
        <property name="datanucleus.appengine.singletonPMFForName" value="true"/>
        <property name="datanucleus.appengine.datastoreReadConsistency" value="EVENTUAL" />
    </persistence-manager-factory>
</jdoconfig>

我正在使用 android studio 作为 IDE 进行开发。上面附加的代码 fragment 来 self 的 android 应用程序。我正在使用 google app engine 数据存储作为我的应用程序的后端，并且为了实体持久性我正在使用 JDO 框架。

请提出上述异常(堆栈跟踪)的可能原因。

最佳答案

正如 Neil Stockton 指出的那样，您的错误消息是明确的。您的 CLASSPATH 中没有“datanucleus-appengine”jar。

关于android - 在 google app engine datastore 中保存 android 应用程序数据时出现异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31521346/

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