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獲得了在AppEngine上運行的應用程序。一直運行良好2年。今天檢查它，我發現它失敗了。我很長一段時間都沒有碰過這些代碼。OutOfMemoryError：Java堆空間GoogleAppEngine
我得到的錯誤是這樣的：
java.lang.OutOfMemoryError: Java heap space
at com.google.storage.onestore.v3.OnestoreEntity$Property.<init>(OnestoreEntity.java:2849)
at com.google.storage.onestore.v3.OnestoreEntity$EntityProto.addProperty(OnestoreEntity.java:5755)
at com.google.storage.onestore.v3.OnestoreEntity$EntityProto.merge(OnestoreEntity.java:6232)
at com.google.apphosting.api.DatastorePb$QueryResult.merge(DatastorePb.java:13045)
at com.google.appengine.repackaged.com.google.io.protocol.ProtocolMessage.mergeFrom(ProtocolMessage.java:405)
at com.google.appengine.repackaged.com.google.io.protocol.ProtocolMessage.mergeFrom(ProtocolMessage.java:422)
at com.google.appengine.repackaged.com.google.io.protocol.ProtocolMessage.parseFrom(ProtocolMessage.java:534)
at com.google.appengine.api.datastore.DatastoreApiHelper$1.wrap(DatastoreApiHelper.java:90)
at com.google.appengine.api.datastore.DatastoreApiHelper$1.wrap(DatastoreApiHelper.java:83)
at com.google.appengine.api.utils.FutureWrapper.wrapAndCache(FutureWrapper.java:51)
at com.google.appengine.api.utils.FutureWrapper.get(FutureWrapper.java:67)
at com.google.appengine.api.datastore.FutureHelper.getInternal(FutureHelper.java:71)
at com.google.appengine.api.datastore.FutureHelper.quietGet(FutureHelper.java:32)
at com.google.appengine.api.datastore.QueryResultsSourceImpl.loadMoreEntities(QueryResultsSourceImpl.java:69)
at com.google.appengine.api.datastore.QueryResultsSourceImpl.loadMoreEntities(QueryResultsSourceImpl.java:56)
at com.google.appengine.api.datastore.QueryResultIteratorImpl.ensureLoaded(QueryResultIteratorImpl.java:156)
at com.google.appengine.api.datastore.QueryResultIteratorImpl.hasNext(QueryResultIteratorImpl.java:65)
at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator$1.get(RuntimeExceptionWrappingIterator.java:50)
at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator$1.get(RuntimeExceptionWrappingIterator.java:47)
at org.datanucleus.store.appengine.query.QueryExceptionWrappers$1.get(QueryExceptionWrappers.java:51)
at org.datanucleus.store.appengine.query.QueryExceptionWrappers$2.get(QueryExceptionWrappers.java:86)
at org.datanucleus.store.appengine.query.RuntimeExceptionWrappingIterator.hasNext(RuntimeExceptionWrappingIterator.java:105)
at org.datanucleus.store.appengine.query.LazyResult.resolveAll(LazyResult.java:115)
at org.datanucleus.store.appengine.query.LazyResult.size(LazyResult.java:110)
at org.datanucleus.store.appengine.query.StreamingQueryResult.size(StreamingQueryResult.java:130)
at guestbook.ProxyServlet.processRequest(ProxyServlet.java:132)
at guestbook.ProxyServlet.doGet(ProxyServlet.java:288)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:97)
的代碼在我的代理Servlet接入線路132我從數據庫retrived實體的名單。它是這一行「System.out.println（」from db「+ allEventsLst.size（））;」
我的應用程序在我運行本地服務器時起作用。有任何想法嗎？？？
String fromDateStr = shortDf.format(fromDate);
Query query = pm.newQuery(Event.class, "date >= fromDate");
query.declareImports("import java.lang.String");
query.declareParameters("String fromDate");
List<Event> allEventsLst = (List<Event>)query.execute(fromDateStr);
System.out.println("from db "+allEventsLst.size());
Map<String, Event> eventMap = new HashMap<String, Event>();
for (Event e : allEventsLst) {
感謝
您的數據集變得足夠大，不再適合可用內存了嗎？ – 2011-04-06 18:30:16
好的，我的壞。 appEngine版本沒有正確執行日期過濾，因此它正在獲取所有內容，因此內存不足。問題是我將日期保存爲實體中的字符串，並且由於客戶機依賴性，我無法更改它。我怎樣才能得到數據庫的日期大於我獲得日期的實體？ – 2011-04-06 19:41:44
你的日期格式是什麼？如果是ISO格式（yyyy-mm-dd），則可以過濾字符串並獲得預期結果。如果沒有，你運氣不好 - 你必須使用mapreduce來替換你的日期字符串與實際日期。 – 2011-04-07 01:56:56