Exception when adding data to HDFS on a user remote webapp

Question

I have a method that supposedly adds lines for each call to an existing CSV in my HDFS. I am using CDH 5.0.

My code is as follows:

    else if (Config.getStorageMethod().equals("hdfs")){
        Configuration conf = new Configuration();
        conf.set("fs.defaultFS", "hdfs://10.9.0.108:8020");
        conf.set("hadoop.job.ugi", "hdfs");
        conf.set("dfs.support.append",  "true");
        conf.set("hadoop.home.dir", "/usr/lib/hadoop");
        Path pt= new Path("/user/logger/test.csv");
        FileSystem fs = FileSystem.get(conf);
        FSDataOutputStream fsout = fs.append(pt);
            writer = new PrintWriter(fsout);
    writer.append(sl.getIp());
        writer.append(',');
        writer.append(sl.getTerm());
        writer.append(',');
        writer.append(sl.getFrom());
        writer.append('\n');

        writer.flush();
        writer.close();

The client has been removed on a web server on which Hadoop is not installed. I get the following exception:

2014-05-28/12:53:11.976  WARN: util.NativeCodeLoader - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
2014-05-28/12:53:11.977 DEBUG: security.JniBasedUnixGroupsMappingWithFallback - Falling back to shell based
2014-05-28/12:53:11.977 DEBUG: security.JniBasedUnixGroupsMappingWithFallback - Group mapping impl=org.apache.hadoop.security.ShellBasedUnixGroupsMapping
2014-05-28/12:53:11.983 DEBUG: util.Shell - Failed to detect a valid hadoop home directory
        java.io.IOException: HADOOP_HOME or hadoop.home.dir are not set.
at org.apache.hadoop.util.Shell.checkHadoopHome(Shell.java:265)
at org.apache.hadoop.util.Shell.<clinit>(Shell.java:290)
at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:76)
at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:93)
at org.apache.hadoop.security.Groups.<init>(Groups.java:77)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:240)
at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:255)
at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:232)
at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:718)
at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:703)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:605)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2554)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2546)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2412)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:167)
at CSVWriter.generateCsvFile(CSVWriter.java:23)
at LoggerExecutor.run(LoggerExecutor.java:13)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
2014-05-28/12:53:11.986 ERROR: util.Shell - Failed to locate the winutils binary in the hadoop binary path
java.io.IOException: Could not locate executable null\bin\winutils.exe in the Hadoop binaries.
at org.apache.hadoop.util.Shell.getQualifiedBinPath(Shell.java:318)
at org.apache.hadoop.util.Shell.getWinUtilsPath(Shell.java:333)
at org.apache.hadoop.util.Shell.<clinit>(Shell.java:326)
at org.apache.hadoop.util.StringUtils.<clinit>(StringUtils.java:76)
at org.apache.hadoop.security.Groups.parseStaticMapping(Groups.java:93)
at org.apache.hadoop.security.Groups.<init>(Groups.java:77)
at org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:240)
at org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:255)
at org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:232)
at org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:718)
at org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:703)
at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:605)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2554)
at org.apache.hadoop.fs.FileSystem$Cache$Key.<init>(FileSystem.java:2546)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2412)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:167)
at CSVWriter.generateCsvFile(CSVWriter.java:23)
at LoggerExecutor.run(LoggerExecutor.java:13)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

It seems to me that he is trying to find env variables on my local client for the Hadoop home (which does not exist), while he should look for it remotely if he needs it.

Any ideas?