how to remove dependency problem of cachechonix?

[Niti Kapoor]

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package cache;

/**
 *
 * @author biznis
 */
/*
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/**
 *
 * @author biznis
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/*
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/**
 *
 * @author biznis
 */
import java.io.File;

import java.io.FileReader;

import java.io.IOException;
import org.cacheonix.Cacheonix;
import com.cacheonix.examples.cache.file.cache.data.grid.TextFile;
import org.cacheonix.cache.Cache;



/**

 * An application demonstrating an application-level file cache.

 */

public class ApplicationFileCacheExample {





   /**

    * Gets a file content from the cache ant prints it in the standard output.

    *

    * @param args arguments

    * @throws IOException if an I/O error occured.

    */

   public static void main(String[] args) throws IOException {



      // Replace the file name with an actual file name

      String pathName = "D:/pmin/www.google.com-2017-12-25.txt";



      ApplicationFileCacheExample fileCacheExample = new ApplicationFileCacheExample();

      String fileFromCache = fileCacheExample.getFileFromCache(pathName);

      System.out.print("File content from cache: " + fileFromCache);

   }





   /**

    * Retrieves a file from a cache. Puts it into the cache if it's not cached yet.

    * 

    * This method demonstrates a typical flow an application must follow to cache a file 

    * and to get it from the cache. As you can see, the application is pretty involved 

    * in maintaining the cache. It must read the file, check the the timestamps and update 

    * the cache if its content is stale.

    *

    * @param pathName a file path name.

    * @return a cached file content or null if file not found

    * @throws IOException if an I/O error occurred.

    */

   public String getFileFromCache(String pathName) throws IOException {



      // Get cache

      Cacheonix cacheonix = Cacheonix.getInstance();



      Cache<String, TextFile> cache = cacheonix.getCache("application.file.cache");



      // Check if file exists

      File file = new File(pathName);

      if (!file.exists()) {



         // Invalidate cache

         cache.remove(pathName);



         // Return null (not found)

         return null;

      }



      // Get the file from the cache

      TextFile textFile = cache.get(pathName);



      // Check if the cached file exists

      if (textFile == null) {



         // Not found in the cache, put in the cache



         textFile = readFile(file);



         cache.put(pathName, textFile);

      } else {



         // Found in cache, check the modification time stamp



         if (textFile.getLastModified() != file.lastModified()) {



            // Update cache



            textFile = readFile(file);



            cache.put(pathName, textFile);

         }

      }



      return textFile.getContent();

   }





   /**

    * Reads a file into a new TextFile object.

    *

    * @param file the file to read from.

    * @return a new TextFile object.

    * @throws IOException if an I/O error occurred.

    */

   private static TextFile readFile(File file) throws IOException {



      // Read the file content into a StringBuilder

      char[] buffer = new char[1000];

      FileReader fileReader = new FileReader(file);

      StringBuilder fileContent = new StringBuilder((int) file.length());



      for (int bytesRead = fileReader.read(buffer); bytesRead != -1; ) {

         fileContent.append(buffer, 0, bytesRead);

      }



      // Close the reader

      fileReader.close();



      // Create CachedTextFile object

      TextFile textFile = new TextFile();

      textFile.setContent(fileContent.toString());

      textFile.setLastModified(file.lastModified());



      // Return the result

      return textFile;

   }

}

I HAD added 2.3.1 all dependencies of cacheonix still the error of this package import com.cacheonix.examples.cache.file.cache.data.grid.TextFile doesnt resolved .

[Stephan van Hulst]

So what dependencies did you add, how did you add them, and how do you know about the existence of the missing class definition?

I don't think it's a good idea to be using example classes I production code.

[Niti Kapoor]

as i had added in lib in netbeans and the jars are cacheonix-core  2.3.1 ,cacheonix ,cacheonix-agent and cacheonix-src

[Niti Kapoor]

run:
java.lang.ExceptionInInitializerError
Caused by: java.lang.RuntimeException: Uncompilable source code - package com.cacheonix.examples.cache.file.cache.data.grid does not exist
	at cache.ApplicationFileCacheExample.<clinit>(ApplicationFileCacheExample.java:39)
Exception in thread "main" C:\Users\biznis\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 0 seconds)

this isruntime error.

[Stephan van Hulst]

The class you're using is from an example code snippet. It's not part of those libraries, and since its just an example, it's probably not part of any library.

[Niti Kapoor]

what does it mean its just an example its probably not part of library.

[Niti Kapoor]

i had added file name to test firsti will test than only i can make my code?

[Stephan van Hulst]

You need to get rid of TextFile. It's an example class. Not something for you to use.

[Niti Kapoor]

import java.io.Serializable;

/*
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/**
 *
 * @author biznis
 */
class TextFile implements Serializable {

    long getLastModified() {
        return 0;
       
    }

    String getContent() {
        return null;
       
    }

    void setContent(String toString) {
       
    }

    void setLastModified(long lastModified) {
       
    }
    
}

as i had made this textfilenow i got this error

run:
09:49:20,536  INFO:                 LocalCacheonix( 151) [                    main] - Creating: application.file.cache 
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
	at java.util.Arrays.copyOf(Arrays.java:3332)
	at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
	at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:596)
	at java.lang.StringBuilder.append(StringBuilder.java:190)
	at ApplicationFileCacheExample.readFile(ApplicationFileCacheExample.java:231)
	at ApplicationFileCacheExample.getFileFromCache(ApplicationFileCacheExample.java:159)
	at ApplicationFileCacheExample.main(ApplicationFileCacheExample.java:73)

[Stephan van Hulst]

The exception stack trace tells you exactly what's wrong: Line 231 of ApplicationFileCacheExample attempts to create a StringBuilder with enough capacity to hold the entire file, and the exception message says that you're out of memory.

[Niti Kapoor]

there is string builder class only on line231

   private static TextFile readFile(File file) throws IOException {



      // Read the file content into a StringBuilder

      char[] buffer = new char[1000];

      FileReader fileReader = new FileReader(file);

      StringBuilder fileContent = new StringBuilder((int) file.length());



      for (int bytesRead = fileReader.read(buffer); bytesRead != -1; ) {

         fileContent.append(buffer, 0, bytesRead);

      }



      // Close the reader

      fileReader.close();

[Niti Kapoor]

application.file.cache can anyone explain what is this file and what it should contain.

[Niti Kapoor]

Does javafx has any cache method .

[Stephan van Hulst]

Like I said, creating the StringBuilder causes your application to run out of memory, probably because the size of the file you're trying to put into the string builder is too large.

What are you trying to cache and why?

[Niti Kapoor]

i need to cache the webpages with image why because i need to access the epaper images everyday.

[Stephan van Hulst]

So first of all, the thing you're trying to cache is not actually a text file. Then why is the class named TextFile? Secondly, if it's an HTML page, it won't actually contain the images. You have to cache multiple files. Cacheonix might have a cache available that is specialized for caching web pages.

[Niti Kapoor]

i dont want  to use cacheonix i need to use javafxcache method if any because my complete application is in javafx.

[Stephan van Hulst]

That doesn't make sense. Java FX is a display framework. It doesn't have anything to do with file caching.