java.lang.ClassNotFoundException:TopologyMain [英] java.lang.ClassNotFoundException: TopologyMain
本文介绍了java.lang.ClassNotFoundException:TopologyMain的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试向本地风暴群集提交一个简单的字数拓扑.首先，我尝试使用Maven，然后使用Storm命令行客户端.我使用eclipse创建了JAR文件.但是，它抛出未找到的主类异常.谁能告诉我可能是什么问题?我在下面附上代码和异常.
I am trying to submit a simple word count topology to my local storm cluster. First, i tried using maven and then using storm command line client. I created the JAR file using eclipse. But, it throws main class not found exception. Can anyone tell me what could be the problem? I am attaching the code and exception below.
package com.test.newpackage;
import com.test.newpackage.WordReader;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.tuple.Fields;
import com.test.newpackage.WordCounter;
import com.test.newpackage.WordNormalizer;
public class TopologyMain {
public static void main(String[] args) throws InterruptedException {
// Topology definition
TopologyBuilder builder = new TopologyBuilder();
builder.setSpout("word-reader", new WordReader());
builder.setBolt("word-normalizer", new WordNormalizer())
.shuffleGrouping("word-reader");
builder.setBolt("word-counter", new WordCounter(), 2).fieldsGrouping(
"word-normalizer", new Fields("word"));
// Configuration
Config conf = new Config();
conf.put("wordsFile", args[0]);
conf.setDebug(false);
// Topology run
conf.put(Config.TOPOLOGY_MAX_SPOUT_PENDING, 1);
LocalCluster cluster = new LocalCluster();
cluster.submitTopology("Getting-Started-Toplogie", conf,
builder.createTopology());
Thread.sleep(1000);
cluster.shutdown();
}
}
package com.test.newpackage;
import java.util.HashMap;
import java.util.Map;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Tuple;
public class WordCounter implements IRichBolt {
Integer id;
String name;
Map<String, Integer> counters;
private OutputCollector collector;
/**
* At the end of the spout (when the cluster is shutdown We will show the
* word counters
*/
@Override
public void cleanup() {
System.out.println("-- Word Counter [" + name + "-" + id + "] --");
for (Map.Entry<String, Integer> entry : counters.entrySet()) {
System.out.println(entry.getKey() + ": " + entry.getValue());
}
}
/**
* On each word We will count
*/
@Override
public void execute(Tuple input) {
String str = input.getString(0);
/**
* If the word dosn't exist in the map we will create this, if not We
* will add 1
*/
if (!counters.containsKey(str)) {
counters.put(str, 1);
} else {
Integer c = counters.get(str) + 1;
counters.put(str, c);
}
// Set the tuple as Acknowledge
collector.ack(input);
}
/**
* On create
*/
@Override
public void prepare(Map stormConf, TopologyContext context,
OutputCollector collector) {
this.counters = new HashMap<String, Integer>();
this.collector = collector;
this.name = context.getThisComponentId();
this.id = context.getThisTaskId();
}
@Override
public void declareOutputFields(OutputFieldsDeclarer declarer) {
}
@Override
public Map<String, Object> getComponentConfiguration() {
// TODO Auto-generated method stub
return null;
}
}
package com.test.newpackage;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
public class WordNormalizer implements IRichBolt {
private OutputCollector collector;
public void cleanup() {
}
/**
* The bolt will receive the line from the words file and process it to
* Normalize this line
*
* The normalize will be put the words in lower case and split the line to
* get all words in this
*/
public void execute(Tuple input) {
String sentence = input.getString(0);
String[] words = sentence.split(" ");
for (String word : words) {
word = word.trim();
if (!word.isEmpty()) {
word = word.toLowerCase();
// Emit the word
List a = new ArrayList();
a.add(input);
collector.emit(a, new Values(word));
}
}
// Acknowledge the tuple
collector.ack(input);
}
public void prepare(Map stormConf, TopologyContext context,
OutputCollector collector) {
this.collector = collector;
}
/**
* The bolt will only emit the field "word"
*/
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("word"));
}
@Override
public Map<String, Object> getComponentConfiguration() {
// TODO Auto-generated method stub
return null;
}
}
package com.test.newpackage;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.Map;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.topology.IRichSpout;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.Values;
public class WordReader implements IRichSpout {
private SpoutOutputCollector collector;
private FileReader fileReader;
private boolean completed = false;
private TopologyContext context;
public boolean isDistributed() {
return false;
}
public void ack(Object msgId) {
System.out.println("OK:" + msgId);
}
public void close() {
}
public void fail(Object msgId) {
System.out.println("FAIL:" + msgId);
}
/**
* The only thing that the methods will do It is emit each file line
*/
public void nextTuple() {
/**
* The nextuple it is called forever, so if we have been readed the file
* we will wait and then return
*/
if (completed) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// Do nothing
}
return;
}
String str;
// Open the reader
BufferedReader reader = new BufferedReader(fileReader);
try {
// Read all lines
while ((str = reader.readLine()) != null) {
/**
* By each line emmit a new value with the line as a their
*/
this.collector.emit(new Values(str), str);
}
} catch (Exception e) {
throw new RuntimeException("Error reading tuple", e);
} finally {
completed = true;
}
}
/**
* We will create the file and get the collector object
*/
public void open(Map conf, TopologyContext context,
SpoutOutputCollector collector) {
try {
this.context = context;
this.fileReader = new FileReader(conf.get("wordsFile").toString());
} catch (FileNotFoundException e) {
throw new RuntimeException("Error reading file["
+ conf.get("wordFile") + "]");
}
this.collector = collector;
}
/**
* Declare the output field "word"
*/
public void declareOutputFields(OutputFieldsDeclarer declarer) {
declarer.declare(new Fields("line"));
}
@Override
public void activate() {
// TODO Auto-generated method stub
}
@Override
public void deactivate() {
// TODO Auto-generated method stub
}
@Override
public Map<String, Object> getComponentConfiguration() {
// TODO Auto-generated method stub
return null;
}
}
mvn exec:java -Dexec.mainClass="TopologyMain" -Dexec.args="resources/
words.txt"
storm jar TopologyMain.jar TopologyMain wordcount
Exception in thread "main" java.lang.NoClassDefFoundError: TopologyMain
Caused by: java.lang.ClassNotFoundException: TopologyMain
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: TopologyMain. Program will exit.
编辑例外:
backtype.storm.daemon.nimbus - Activating word-count: word-count-1-1374756437
1724 [main] ERROR org.apache.zookeeper.server.NIOServerCnxn - Thread Thread[main,5,main] died
java.lang.NullPointerException
at clojure.lang.Numbers.ops(Numbers.java:942)
at clojure.lang.Numbers.isPos(Numbers.java:94)
at clojure.core$take$fn__4112.invoke(core.clj:2500)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$concat$fn__3804.invoke(core.clj:662)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$concat$cat__3806$fn__3807.invoke(core.clj:671)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$map$fn__4091.invoke(core.clj:2437)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core.protocols$seq_reduce.invoke(protocols.clj:30)
at clojure.core.protocols$fn__5875.invoke(protocols.clj:54)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at clojure.core$into.invoke(core.clj:6077)
at backtype.storm.daemon.common$storm_task_info.invoke(common.clj:245)
at backtype.storm.daemon.nimbus$compute_executors.invoke(nimbus.clj:408)
at backtype.storm.daemon.nimbus$compute_executor__GT_component.invoke(nimbus.clj:420)
at backtype.storm.daemon.nimbus$read_topology_details.invoke(nimbus.clj:315)
at backtype.storm.daemon.nimbus$mk_assignments$iter__3398__3402$fn__3403.invoke(nimbus.clj:626)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core.protocols$seq_reduce.invoke(protocols.clj:30)
at clojure.core.protocols$fn__5875.invoke(protocols.clj:54)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at clojure.core$into.invoke(core.clj:6077)
at backtype.storm.daemon.nimbus$mk_assignments.doInvoke(nimbus.clj:625)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at backtype.storm.daemon.nimbus$fn__3590$exec_fn__1207__auto__$reify__3603.submitTopology(nimbus.clj:898)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at clojure.lang.Reflector.invokeMatchingMethod(Reflector.java:93)
at clojure.lang.Reflector.invokeInstanceMethod(Reflector.java:28)
at backtype.storm.testing$submit_local_topology.invoke(testing.clj:227)
at backtype.storm.LocalCluster$_submitTopology.invoke(LocalCluster.clj:19)
at backtype.storm.LocalCluster.submitTopology(Unknown Source)
at storm.starter.WordCountTopology.main(WordCountTopology.java:83)
11769 [Thread-2] ERROR backtype.storm.daemon.nimbus - Error when processing event
java.lang.NullPointerException
at clojure.lang.Numbers.ops(Numbers.java:942)
at clojure.lang.Numbers.isPos(Numbers.java:94)
at clojure.core$take$fn__4112.invoke(core.clj:2500)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$concat$fn__3804.invoke(core.clj:662)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$concat$cat__3806$fn__3807.invoke(core.clj:671)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core$map$fn__4091.invoke(core.clj:2437)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core.protocols$seq_reduce.invoke(protocols.clj:30)
at clojure.core.protocols$fn__5875.invoke(protocols.clj:54)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at clojure.core$into.invoke(core.clj:6077)
at backtype.storm.daemon.common$storm_task_info.invoke(common.clj:245)
at backtype.storm.daemon.nimbus$compute_executors.invoke(nimbus.clj:408)
at backtype.storm.daemon.nimbus$compute_executor__GT_component.invoke(nimbus.clj:420)
at backtype.storm.daemon.nimbus$read_topology_details.invoke(nimbus.clj:315)
at backtype.storm.daemon.nimbus$mk_assignments$iter__3398__3402$fn__3403.invoke(nimbus.clj:626)
at clojure.lang.LazySeq.sval(LazySeq.java:42)
at clojure.lang.LazySeq.seq(LazySeq.java:60)
at clojure.lang.RT.seq(RT.java:473)
at clojure.core$seq.invoke(core.clj:133)
at clojure.core.protocols$seq_reduce.invoke(protocols.clj:30)
at clojure.core.protocols$fn__5875.invoke(protocols.clj:54)
at clojure.core.protocols$fn__5828$G__5823__5841.invoke(protocols.clj:13)
at clojure.core$reduce.invoke(core.clj:6030)
at clojure.core$into.invoke(core.clj:6077)
at backtype.storm.daemon.nimbus$mk_assignments.doInvoke(nimbus.clj:625)
at clojure.lang.RestFn.invoke(RestFn.java:410)
at backtype.storm.daemon.nimbus$fn__3590$exec_fn__1207__auto____3591$fn__3596$fn__3597.invoke(nimbus.clj:860)
at backtype.storm.daemon.nimbus$fn__3590$exec_fn__1207__auto____3591$fn__3596.invoke(nimbus.clj:859)
at backtype.storm.timer$schedule_recurring$this__1753.invoke(timer.clj:69)
at backtype.storm.timer$mk_timer$fn__1736$fn__1737.invoke(timer.clj:33)
at backtype.storm.timer$mk_timer$fn__1736.invoke(timer.clj:26)
at clojure.lang.AFn.run(AFn.java:24)
at java.lang.Thread.run(Thread.java:679)
11774 [Thread-2] INFO backtype.storm.util - Halting process: ("Error when processing an event")
推荐答案
Naresh，根据我所见，解决您的问题的方法可能在于您使用的类名.这是您指定的命令行参数:
Naresh, based on what I see the solution to your problem may lie in the class name you used. Here is the command line argument you specified:
storm jar TopologyMain.jar TopologyMain wordcount
您仅使用类名而不是完全限定名将主类称为"TopologyMain".这是我对您的Storm命令行尝试的修订:
You refer to your main class as "TopologyMain" using only the class name rather than the fully qualified name. Here is my revision of your storm command line attempt:
storm jar TopologyMain.jar com.test.newpackage.TopologyMain
我使用完整的程序包名称，而不是仅使用类本身.请注意，我也删除了对"wordcount"的引用，因为我不知道它在做什么(在代码示例中没有称为"wordcount"的类，方法或变量).
I use the full package name instead of just the class by itself. Note that I also removed the reference to "wordcount" because I don't know what it's doing there (there are no classes, methods, or variables called "wordcount" in your code sample).
这是一篇关于Google网上论坛的精彩文章，其中涵盖了Storm的早期设置问题: 早期设置问题
Here is an excellent article on Google groups which covers early setup problems with Storm: early setup question
当我开始使用Storm的前几周，我发现自己在使用这篇文章.
I found myself using this article for the first couple of weeks when I started using Storm.
请告诉我们这是否可以解决您的问题.
Please let us know if this solves your problem.
这篇关于java.lang.ClassNotFoundException:TopologyMain的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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