在Google App Engine上，每次启动开发服务器时，我都会收到多个java.lang.reflect.InvocationTargetException。我正在使用Spring MVC 3.0。
我的应用程序工作正常，但我觉得异常减慢了开发服务器的启动时间，我不确定实际服务器上是否也发生异常，并且当GAE启动时减慢启动时间新实例。
输出结果为：
[java] The server is running at http://localhost:8080/
[java] Jan 21, 2010 4:16:52 PM com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue <init>
[java] INFO: Failed to start reference finalizer thread. Reference cleanup will only occur when new references are created.
[java] java.lang.reflect.InvocationTargetException
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[java] at java.lang.reflect.Method.invoke(Method.java:597)
[java] at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:100)
[java] at com.google.appengine.repackaged.com.google.common.base.FinalizableReferenceQueue.<init>(FinalizableReferenceQueue.java:124)
[java] at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools$WeakInterningPool.<clinit>(InterningPools.java:104)
[java] at com.google.appengine.repackaged.com.google.common.labs.misc.InterningPools.newWeakInterningPool(InterningPools.java:48)
[java] at com.google.appengine.repackaged.com.google.io.protocol.ProtocolSupport.<clinit>(ProtocolSupport.java:55)
[java] at com.google.apphosting.api.DatastorePb$Query.<init>(DatastorePb.java:1072)
[java] at com.google.apphosting.api.DatastorePb$Query$1.<init>(DatastorePb.java:2355)
[java] at com.google.apphosting.api.DatastorePb$Query.<clinit>(DatastorePb.java:2355)
[java] at com.google.appengine.api.datastore.QueryTranslator.convertToPb(QueryTranslator.java:28)
[java] at com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.convertToPb(DatastoreServiceImpl.java:382)
[java] at com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.runQuery(DatastoreServiceImpl.java:342)
[java] at com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl.access$100(DatastoreServiceImpl.java:272)
[java] at com.google.appengine.api.datastore.DatastoreServiceImpl$PreparedQueryImpl$1.iterator(DatastoreServiceImpl.java:306)
[java] at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterable.iterator(RuntimeExceptionWrappingIterable.java:42)
[java] at org.datanucleus.store.appengine.query.StreamingQueryResult.<init>(StreamingQueryResult.java:77)
[java] at org.datanucleus.store.appengine.query.DatastoreQuery.newStreamingQueryResultForEntities(DatastoreQuery.java:324)
[java] at org.datanucleus.store.appengine.query.DatastoreQuery.fulfillEntityQuery(DatastoreQuery.java:310)
[java] at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:242)
[java] at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java:84)
[java] at org.datanucleus.store.query.Query.executeQuery(Query.java:1489)
[java] at org.datanucleus.store.query.Query.executeWithArray(Query.java:1371)
[java] at org.datanucleus.store.query.Query.execute(Query.java:1344)
[java] at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:221)
[java] at app.controllers.RootController.Index(RootController.java:30)
编辑：当我的索引页运行简单的SELECT数据存储区查询时，就会发生这种情况。但它仍然只在开发服务器启动后才发生。如果我刷新索引页面或执行其他查询，则不再发生异常。
以下是第一次运行时导致异常的查询。
Query q = pm.newQuery(Question.class);
List<Question> cards = (List<Question>) q.execute();
答案 0 :(得分：1)
实际上，我认为这是一个CAUGHT并处理了异常。如果你看这里：http://www.google.com/codesearch/p?hl=en#YXcrkXezIpQ/trunk/src/com/google/common/base/FinalizableReferenceQueue.java
你会看到仍然在第134行创建了queue。我会再做一些搜索，看看是否还有其他办法可以更好地处理这个问题，但我不知道是不是什么是明确导致你的缓慢。