我得到java.lang.NoSuchMethodException请帮助我在这个…
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.filecache.DistributedCache;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
public class Placeholder extends Configured implements Tool
{
private static Path[] filepath;
private static String filename;
private static String[] calendartablecolumn;
private static BufferedReader br;
private static String placeholder;
private static String output;
private static HashMap<String,String> map = new HashMap<String,String>();
public int run(String[] args) throws Exception {
String placeholdername = args[3];
String stratposition = args[4];
String length = args[5];
String category = args[6];
String calendarid = args[7];
Configuration conf = new Configuration();
conf.set("placeholdername", placeholdername);
conf.set("stratposition", stratposition);
conf.set("length", length);
conf.set("category", category);
conf.set("calendarid", calendarid);
Job job = Job.getInstance(conf, "Placeholder");
DistributedCache.addCacheFile(new Path(args[2]).toUri(), getConf());
job.setJarByClass(Placeholder.class);
job.setMapperClass(PlaceholderMapper.class);
job.setNumReduceTasks(0);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(Text.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
return job.waitForCompletion(true) ? 0 : 1;
}
public static void main(String[] args) throws Exception {
int res = ToolRunner.run(new Configuration(), new Placeholder(), args);
System.exit(res);
}
public class PlaceholderMapper extends Mapper<LongWritable,Text,Text,Text>
{
protected void setup(Context context) throws IOException,InterruptedException
{
try {
filepath = DistributedCache.getLocalCacheFiles(getConf());
filename = filepath[0].getName().toString();
br = new BufferedReader(new FileReader(filepath[0].toString()));
String line = null;
while ((line = br.readLine()) != null)
{
calendartablecolumn = line.split("\,");
}
} catch (Exception e) {
}
}
public void map(LongWritable keys, Text value, Context context) throws IOException, InterruptedException
{
String str_placeholdername = context.getConfiguration().get("placeholdername");
String str_stratposition = context.getConfiguration().get("stratposition");
int int_stratposition = Integer.parseInt(str_stratposition);
String str_length = context.getConfiguration().get("length");
int int_length = Integer.parseInt(str_length);
String str_category = context.getConfiguration().get("category");
String str_calendarid = context.getConfiguration().get("calendarid");
int int_calendarid = Integer.parseInt(str_calendarid);
if (str_category != null)
{
if (str_category.equalsIgnoreCase("filename"))
{
placeholder = filename.substring((int_stratposition-1),(int_length-1));
}else if (str_category.equalsIgnoreCase("startdate"))
{
map.put(calendartablecolumn[0].trim(),calendartablecolumn[3].trim());
placeholder = map.get(int_calendarid);
}else if (str_category.equalsIgnoreCase("enddate"))
{
map.put(calendartablecolumn[0].trim(),calendartablecolumn[4].trim());
placeholder = map.get(int_calendarid);
}else if (str_category.equalsIgnoreCase("currentdate"))
{
DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
Date date = new Date();
String currentdate = (dateFormat.format(date)).toString();
placeholder = currentdate.substring((int_stratposition-1),(int_length-1));
}else if (str_category.equalsIgnoreCase("isdailydata"))
{
}
output = value+","+placeholder;
}else
{
String line = value.toString();
output = line.substring((int_stratposition-1),(int_length-1));
}
context.write(null,new Text (output));
}
}
}
这是我得到的错误-
错误:java.lang.RuntimeException: java.lang.NoSuchMethodException:com.nielsen.GRFE.processor.mapreduce.Placeholder PlaceholderMapper美元。()org.apache.hadoop.util.ReflectionUtils.newInstance (ReflectionUtils.java: 131)org.apache.hadoop.mapred.MapTask.runNewMapper (MapTask.java: 745)org.apache.hadoop.mapred.MapTask.run (MapTask.java: 341)在org.apache.hadoop.mapred.YarnChild 2.美元运行(YarnChild.java: 163)在java.security.AccessController。doPrivileged(本地方法)javax.security.auth.Subject.doAs (Subject.java: 415)org.apache.hadoop.security.UserGroupInformation.doAs (UserGroupInformation.java: 1671)在org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)中:com.nielsen.GRFE.processor.mapreduce.Placeholder PlaceholderMapper美元。()java.lang.Class.getConstructor0 (Class.java: 2849)java.lang.Class.getDeclaredConstructor (Class.java: 2053)org.apache.hadoop.util.ReflectionUtils.newInstance (ReflectionUtils.java: 125)
我认为问题是你的PlaceholderMapper类不是static，尽量使它成为public static。