Question

我正在尝试搜索项目中的索引。当我用中搜索时 searchText： 学期：＆＃34; S1 / 2016＆＃34; AND状态：验证AND emp_id＆gt; 0 ，我得到了正确的结果。

当我用中搜索时 searchText： 学期：＆＃34; S1 / 2016＆＃34; AND状态：验证AND emp_id＆gt; 500 ，我收到以下异常

java.lang.NegativeArraySizeException
    at com.google.appengine.api.search.dev.GenericScorer.search(GenericScorer.java:196)
    at com.google.appengine.api.search.dev.LocalSearchService.searchForApp(LocalSearchService.java:584)
    at com.google.appengine.api.search.dev.LocalSearchService.search(LocalSearchService.java:534)
    at sun.reflect.GeneratedMethodAccessor93.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.callInternal(ApiProxyLocalImpl.java:541)
    at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:484)
    at com.google.appengine.tools.development.ApiProxyLocalImpl$AsyncApiCall.call(ApiProxyLocalImpl.java:461)
    at java.util.concurrent.Executors$PrivilegedCallable$1.run(Executors.java:493)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.concurrent.Executors$PrivilegedCallable.call(Executors.java:490)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

以下是执行搜索的代码：

public Results<ScoredDocument> retrieveDocuments(String searchText) {
    if (searchText.length() > 2000) {
        throw new InternalException(new Exception("Error - Too long query !!"),
        BaseValidationMessages.SEARCH_STRING_EXCEEDS_LIMIT);
    }
    QueryOptions options =QueryOptions.newBuilder().setOffset(0).setLimit(2)
                                        .setSortOptions(createSortOptions("emp_id", "asc")).build();
    Query query = Query.newBuilder().setOptions(options).build(searchText);
    IndexSpec indexSpec = IndexSpec.newBuilder().setName("Beneficiaries").build();
    Index index = SearchServiceFactory.getSearchService().getIndex(indexSpec);
    return index.search(query);
}

Answer 1

如果传递给索引搜索的偏移超出可用结果计数的范围，则Google Appengine会抛出NegativeArraySizeException。

对于例如，考虑搜索索引中有50个文档可用于给定的搜索查询文本，如果搜索查询选项中设置的偏移量大于50，则在执行搜索时会抛出NegativeArraySizeException。

QueryOptions options = QueryOptions.newBuilder().setOffset(**51**)

因此，在设置偏移之前，请确保使用之前的结果可以获得偏移的文档。

第一次查询：

QueryOptions options = QueryOptions.newBuilder().setOffset(0).setLimit(50);
IndexSpec indexSpec = IndexSpec.newBuilder().setName("Beneficiaries").build();
Index index = SearchServiceFactory.getSearchService().getIndex(indexSpec);
Results<ScoredDocument>results = index.search(query);

如果从上面的查询返回的结果等于50，则搜索Next Set;

QueryOptions options = QueryOptions.newBuilder().setOffset(**51**)

如果返回的结果小于50，那么我们可以假设，没有更多的结果可用于搜索偏移＆gt; 50，然后我们可以停止进一步搜索。

GoogleAppEngine：GenericScorer.search会抛出NegativeArraySizeException

1 个答案: