Reading Entire file

Hi,
When I am trying to read the entire text file into string I am receiving NoClassDefFoundError:
Here goes the code
String str="";
String readString="";
StringBuffer temp=new StringBuffer(80);
File fin=new File(args[0]);
FileReader in=new FileReader(fin);
BufferedReader buf=new BufferedReader(in);
while((readString=buf.readLine())!=null)
str=temp.append(readString).toString();
Can anyone help in this.
Thanks In advance.

The NoClassDefError means a class could not be found.
This has nothing to do with reading files.
If you look at the class it mentions after this you will see the class it cannot find.
The most common cause of this is either the JVM is not installed properly or your path configuration is incorrect.

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OK thanks Dom.
I have a few things which you may consider trying in order to troubleshoot the issue.
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When you are using BufferedReader to read info into a buffer, that means you are reading the file into memory, correct? (Is that what buffer means?)
I want to look for pattern matches in text files (about 1000 of them) using the regex utils. But I don't want to read and examine the text files line by line. I want to read in the entire text file into memory first and then look for the pattern matches. The text files generally don't exceed about 15K in size. I'm only going one file at a time, too, so this won't give me any out of memory errors, will it?
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When you are using BufferedReader to read info into a
buffer, that means you are reading the file into
memory, correct? (Is that what buffer means?)Yes.
I want to look for pattern matches in text files
(about 1000 of them) using the regex utils. But I
don't want to read and examine the text files line by
line.Why not?
I want to read in the entire text file into
memory first and then look for the pattern matches.Why?
The text files generally don't exceed about 15K in
size. I'm only going one file at a time, too, so
this won't give me any out of memory errors, will
it?Depends on how much memory you've given the VM and how much of that it's using already at the time you read the files, but in general, probably not a problem.
And more importantly, how do I do it? I mean the
"reading in the file" part only.Use BufferedReader to read line by line and then append each line (plus a newline, since BR.readLine() strips those off) to a StringBuilder.
Or use a BufferedInputStream and and array that's as big as the file, and in a loop, try to read as much as is left into that array at an offset equal to how much has been read so far.
I still think this is probably not a good approach though.

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Notice: I apolgize for the long post, I've tried to be as thorough as possible. I have searched everywhere for possible solutions, but things I've found end up being temporary workarounds or don't apply to my situation. Any help, even as simple as, "have you checked out XYZ log, it's hidden here", would be greatly appreciated. Thanks
I'm not sure what exactly caused the issues below, but they did start to happen within a day of running pacman -Syu. I hadn't run that since I first installed Arch on December 2nd of this year.
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https://bbs.archlinux.org/viewtopic.php?id=150704
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device-mapper: remove ioctl on LVM_SysGroup failed: Device or resource busy
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I utilized all disk checking functions possible. From running the tests (SMART test included) that came as part of my laptop's BIOS to full blown fsck. All tests showed the drive was working fine, and Fsck would show everything was either clean, or
Clearing orphaned inode ## (uid=89, gid=89, mode=0100600, size=###
Free blocks count wrong (###, counted=###)
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I could safely boot back into Arch and use the system fine until the system decides to freeze/crash and do the above all over again.
The sure way of recreating this for me is to run a cron job on a local site I'm developing. After a brief screen freeze (mouse still moveable but everything is otherwise unreponsive) I'll systemctl status mysqld.service and notice that mysqld went down.
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ERROR: file_stream_metrics.cc(37)
RecordFileError() err = 30 source = 1 record = 0
Server terminated successfully (0)
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Before all this happened, I was using Arch just fine for a few weeks. I wiped the drives and started anew, and this still happens with just the minimal number of packages installed.
I've searched for solutions to each individual problem, but come across a hack that doesn't solve anything (like turning off storing logs for journal), or the solution doesn't apply to my case.
At this point, I'm so overwhelmed I'm not even sure where exactly to pick up figuring this issue out.
Thanks in advance for any help

Did this occur when you booted from the live/install media?
What is your current set up? That is, partitions, filesystems etc. I take it you have not yet reinstalled X but are in the default CLI following installation?
If turning off log storage didn't help, reenable it so that you may at least stand a chance of finding something useful.
What services, if any, are you running? What non-default daemons etc.?
Does it happen if you keep the machine off line?
Have you done pacman -Syu since installation and dealt with any *.pacnew files?
Last edited by cfr (2012-12-26 22:17:57)

How do i show the filename.type instead of the entire file path?

How do i show the filename.type instead of the entire file path?
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Hi guys
Thanks for all the help I have been getting here. I just wish I could help someone else, but that day will come. Well I hope so.
I would like to know the best way (no the easiest way) of reading the entire file in a folder into a list.
Can someone point me or show me how this is done?
I possible to show me a snippet of code to get me started would be great
Thanks
Craig

Here is some untested code:
import java.io.File;
import java.util.Arrays;
import java.util.List;
File dir = new File("C:/winnt");
File[] files = dir.listFiles();
// You wanted it in a list. I guess you just mean a java.util.List.
List fileList = Arrays.asList(files);Jesper

Read a file without loading it into memory

I have a VERY large file filled with words. I want to determine if a String in my program matches one of them. Loading the entire file into memory would take a long time and would use way too much memory. Is there some way to load just the part I need each time or make the comparison directly from the file on the hard disk?

The file is static, so your plan seems to have merit.
I've only used sequential files before, but I'm
assuming this would require a random access file since
you have to begin reading at a specified offset. Am I
correct?Yes.
In addition, if this file is fixed-length "records" so that you could programmatically determine the word offsets without having to keep a map of indexes in memory, you could just employ a search algorithm (I forget what this one is called) - you could start by defining 2 endpoints, initially at offset 0 and the offset of the last word.
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CVI I am a beginner and have some basic questions.
Currently I am using CVI 2009th
I want to open a file and transform it into another format. The most important information to be displayed on the GUI.
For text output, I use the textbox.
With readline everything has worked, but for my data rows rather is impractical.
That's why I tried the same with FileToArray. But the array does not display in the text box.
I just do not know exactly how the textbox works. Does the textbox made a formfeed after a certain number of characters? Or I can write text in succession away?
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Solved!
Go to Solution.

Ok, so you are dealing with bynary data to read from the file. First of all, the post you linked refers to FileToArray () function, an I/O function which opens a file, reads its content in memory and closes it. It is basically different from ReadLine or ScanFile functions: ArrayToFile is useful to read files with numeric data only, which is not your case.
On the other hand, ReadLine actually reads file content into a string, without splitting it into data fields. On the data you have posted, ReadLine will read the entire field into a single string, since inside the data no linefeed is present. It will be up to you to extract from the string the values you need. It is possibly not the best approach...
Another option can be to read directly from binary format into memory, defining an appropriate datatype to read in file content. I don't know FDS file format (which of them is? ) so I made a rough trial to describe the data structure: knowing the exact data format you will be able to define the appropriate structure; the result will be something like that:
typedef struct {
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   char   version[7];
   char n1[32][8];
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My attempt correctly scans all (hypothetic ) fields in text section, doing nothing in the binary section which is simply read int 'data' field.
I understand that this is not so simple to understand: I will be glad to clarify your doubts if any.
Message Edited by Roberto Bozzolo on 02-12-2010 05:31 PM
Proud to use LW/CVI from 3.1 on.
My contributions to the Developer Zone Community
If I have helped you, why not giving me a kudos?

Reading Entire file

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