NullPointerException bei Lucene-Appengine SegmentIndexInput readByte Methode

Question

Ich bekomme die folgenden Fehler Trace von Lucene ausgeführt. Ich schließe das Code-Segment ein, das den Fehler ausgelöst hat. Das spezifische Projekt/Stecker ist Lucene for Appengine

CODE

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(); 
     } 
     } 
    } 

ERROR

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) 

Hier ist meine appengine-web.xml Datei und auch the modified RamUsageEstimator as suggested Ich bin mit

<?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

Blick auf den Code SegmentIndexInput Hunk ist Null.

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

im Code von GaeDirectory sucht die null ist, weil Segment keine großen Stücke erstellt hat. Bevor Sie das neue Verzeichnis verwenden, sollten Sie createOutput(String name) oder touchFile(StringName) anrufen, so dass ein Segment mit mindestens einem Hunk erstellt wird.