On Thu, May 7, 2009 at 1:26 PM, Foss User <[email protected]> wrote:
> I was trying to write a Java code to copy a file from local system to
> a file system (which is also local file system). This is my code.
>
> package in.fossist.examples;
>
> import java.io.File;
> import java.io.IOException;
> import org.apache.hadoop.conf.Configuration;
> import org.apache.hadoop.fs.Path;
> import org.apache.hadoop.fs.LocalFileSystem;
> import org.apache.hadoop.fs.FileUtil;
>
> public class FileOps
> {
> public static void main(String[] args) throws IOException
> {
> FileUtil.copy(new File("a.txt"),
> new LocalFileSystem(),
>
You can't create a FileSystem like this. You should do something like:
Path src = new Path("a.txt");
Path dst = new Path("b.txt");
Configuration conf = new Configuration();
FileUtil.copy(src.getFileSystem(conf), src, dst.getFileSystem(conf), dst,
false, conf);
> new Path("b.txt"),
> false,
> new Configuration());
> }
> }
>
> This is the error:
>
> ubuntu:/opt/hadoop-0.19.1# bin/hadoop jar fileops-0.1.jar
> in.fossist.examples.FileOps
> java.lang.NullPointerException
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:375)
> at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:367)
> at org.apache.hadoop.fs.FileUtil.copy(FileUtil.java:286)
> at in.fossist.examples.FileOps.main(Unknown Source)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.util.RunJar.main(RunJar.java:165)
> at org.apache.hadoop.mapred.JobShell.run(JobShell.java:54)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:79)
> at org.apache.hadoop.mapred.JobShell.main(JobShell.java:68)
>
> Please help me to fix this error.
>
