hadoop java api下载文件_Java api 从hdfs上下载文件失败，报错null指针，怎么回事啊...

作者：知新_RL | 2024-06-20 17:50:14

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hdfsclient.download 为 null

@Test

public void copyToLocalFile() throws Exception {

Path localPath = new Path("C:\\Users\\18811\\Desktop");

Path hdfsPath = new Path("/hello.txt");

fileSystem.copyToLocalFile(hdfsPath, localPath);

}

java.lang.NullPointerException

at java.lang.ProcessBuilder.start(ProcessBuilder.java:1010)

at org.apache.hadoop.util.Shell.runCommand(Shell.java:505)

at org.apache.hadoop.util.Shell.run(Shell.java:478)

at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:738)

at org.apache.hadoop.util.Shell.execCommand(Shell.java:831)

at org.apache.hadoop.util.Shell.execCommand(Shell.java:814)

at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:664)

at org.apache.hadoop.fs.FilterFileSystem.setPermission(FilterFileSystem.java:506)

at org.apache.hadoop.fs.C

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