Hi,
I am new to hadoop programming. I am trying to copy a local file to HDFS. My
code snippet is:
.
.
Configuration conf = new Configuration();
InputStream in=null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(src));
FileSystem fs = FileSystem.get(URI.create(dest), conf); *//line:42.
Exception here*
if(fs == null)
System.out.println("fs is null");
else
System.out.println("fs is not null");
out = fs.create(new Path(dest), true);
IOUtils.copyBytes(in, out, conf, true);
System.out.println(dest +" is created successfully.");
} catch (IOException e) {
IOUtils.closeStream(out);
IOUtils.closeStream(in);
throw e;
}
.
.
and when I run it, I got exception:
Exception in thread "main" java.lang.NullPointerException
at org.apache.hadoop.conf.Configuration.get(Configuration.java:436)
at
org.apache.hadoop.fs.FileSystem.getDefaultUri(FileSystem.java:103)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:95)
at HDFSFile.create(HDFSFile.java:42)
at HDFSFile.main(HDFSFile.java:130)
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 org.apache.hadoop.util.RunJar.main(RunJar.java:156
After dug into source code of hdfs, I found the problem happens at
"Configuration.getProps()". The value of getProps() is null and, obviously,
it shouldn't be.
I couldn't figure out why this happen. Please help me out here.
Appreciate!
