NullPointerException в методе readByte SegmentIndexInput от Lucene-Appengine

Question

Я получаю следующую ошибку трассировки при запуске Lucene. Я включаю сегмент кода, который вызвал ошибку. Конкретный проект / коннектор Lucene для Appengine

КОД

public static void resetAllIndicesUsingDatastore() {
    LOG.info("Inside  resetAllIndicesUsingDatastore ");
    StandardAnalyzer analyzer = new StandardAnalyzer();
    GaeDirectory directory = new GaeDirectory(LuceneWorker.DOGS);// create dog index
    IndexWriterConfig config = GaeLuceneUtil.getIndexWriterConfig(LuceneWorker.LUCENE_VERSION, analyzer);
    IndexWriter writer = null;
    LOG.info("GOING TO TRY ");
    try {
      // delete all elements
      writer = new IndexWriter(directory, config);//LINE 142
      LOG.info("Going to delete all that's there ");
      writer.deleteAll();
      writer.commit();

      // get all dogs from datastore
      List<Dog> dogs = DogDaoImpl.getAll();
      LOG.info("All dogs size is : " + dogs.size());

      for (Dog p : dogs) {
        LuceneIndexDogTaskQueue.indexDog(p.getDogId());
        LOG.info("Dog sent to ask queue for lucene is : " + p.getTitle() + " with id: " + p.getDogId());
      }
      LOG.info("Leaving  resetAllIndicesUsingDatastore with no error ");
    } catch (IOException e) {
      LOG.info("Leaving  resetAllIndicesUsingDatastore with ERROR " + e.getLocalizedMessage() + "   msg:: " + e.getMessage());
      e.printStackTrace();
    } finally {
      if (null != writer) {
        try {
          writer.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }

ОШИБКА

com.google.api.server.spi.SystemService invokeServiceMethod: cause={0}
java.lang.NullPointerException
    at com.googlecode.luceneappengine.SegmentIndexInput.readByte(SegmentIndexInput.java:70)
    at org.apache.lucene.store.BufferedChecksumIndexInput.readByte(BufferedChecksumIndexInput.java:41)
    at org.apache.lucene.store.DataInput.readInt(DataInput.java:98)
    at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:347)
    at org.apache.lucene.index.SegmentInfos$1.doBody(SegmentInfos.java:458)
    at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:913)
    at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:759)
    at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:454)
    at org.apache.lucene.index.IndexWriter.<init>(IndexWriter.java:783)
    at com.company.dogappcloud.taskqueue.lucene.LuceneSearchDog.resetAllIndicesUsingDatastore(LuceneSearchDog.java:142)






//remaining of trace but not as important

at com.company.dogappcloud.dogappApi.findDog(dogappApi.java:968)
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: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$CachedChain.doFilter(ServletHandler.java:1166)
at com.googlecode.objectify.cache.AsyncCacheFilter.doFilter(AsyncCacheFilter.java:58)
at com.googlecode.objectify.ObjectifyFilter.doFilter(ObjectifyFilter.java:48)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler$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 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$RequestHandler.headerComplete(HttpConnection.java:923)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
at com.google.tracing.TraceContext$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 java.lang.Thread.run(Thread.java:745)

Вот мой appengine-web.xml файл, а также я использую модифицированный RamUsageEstimator как предложено

<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
    <application>myApplicationId</application>
    <version>1</version>
    <threadsafe>true</threadsafe>

    <system-properties>
        <property name="java.util.logging.config.file" value="WEB-INF/logging.properties"/>
        <property name="java.util.logging.config.file"
                  value="WEB-INF/java-util-logging.properties"/>
        <property name="os.version" value="1.0.GAE whatever"/>
        <property name="os.arch" value="GAE whatever"/>
    </system-properties>

    <class-loader-config>
        <priority-specifier filename="luceneappengine-2.2.0.jar"/>
    </class-loader-config>
</appengine-web-app>

Answer 1

Глядя на код сегмента SegmentIndexInput является нулевым.

@Override
    public byte readByte() throws IOException {
70     if(hunkPointer >= hunk.bytes.length) {
                    hunkPointer = 0;

Глядя на код GaeDirectory, мы видим, что нулевое значение объясняется тем, что сегмент не имеет созданных блоков Прежде чем использовать новый каталог, вы должны позвонить createOutput(String name) или же touchFile(StringName) так что сегмент с хотя бы одним ломом создан