NullPointerException tại phương thức SegmentIndexInput readByte của Lucene-Appengine

Question

Tôi nhận được dấu vết lỗi sau khi chạy Lucene. Tôi bao gồm đoạn mã đã nhắc lỗi. Dự án/kết nối cụ thể là Lucene for Appengine

MÃ

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(); 
     } 
     } 
    } 

LỖI

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) 

Đây là tập tin appengine-web.xml của tôi và tôi cũng đang sử dụng the modified RamUsageEstimator as suggested

<?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

Nhìn vào mã số SegmentIndexInput hunk là null.

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

Nhìn vào mã số GaeDirectory null là do phân khúc không có khối tạo. Trước khi bạn sử dụng thư mục mới, bạn nên gọi số createOutput(String name) hoặc touchFile(StringName) để phân khúc có ít nhất một hunk được tạo