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Unable to locate and load file in Eclipse IDE, File not found

I'm new to Java, and I am facing this issue in Eclipse. Even after pointing it to the correct file, it shows a file not Found Error.
I am trying to compile code from a Java file using the Java Compiler API.
The code words fine in Visual Studio with setting everything in root, But gives this error in Eclipse with all these directories.
Also, why are there three different src folders in the image?
My project structure
package com.example.app;
import javax.tools.JavaCompiler;
import javax.tools.ToolProvider;
import java.io.File;
import java.io.IOException;
public class compilier {
public static void main(String[] args) throws IOException {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
int result = compiler.run(null, null, null, new File("com/example/app/Code.java").getAbsolutePath());
if (result == 0)
{
System.out.println("File Compiled");
}
try {
String package_dir = "/demo/src/main/java/com/example/app";
try{
ProcessBuilder builder = new ProcessBuilder("java", package_dir.concat("/Code"));
builder.redirectErrorStream(true);
File outfile = new File((package_dir.concat("/output.txt")));
builder.redirectOutput();
builder.start();
if (outfile.length() > 3000)
{
System.out.println("Exceeded buffer limit");
System.exit(1);
}
} catch(IOException e) {
e.printStackTrace();
}
} catch (Exception err) {
System.out.println("Error!");
err.printStackTrace();
}
}
}
Error Message

Your path looks wrong. The /demo directory would need to be in the root of your current drive.
Also, the output of a Maven build is found in the target directory. The Java class files are generated there, and the resource files are copied over from src/main/res hierarchy. The .Java files are lost. You could add a Maven task to copy the .Java files but this would be very nonstandard.
Finally you need to load resource files using the classpath. There are lots of examples on the Internet. Otherwise you may end up with a project that finds the file in Eclipse but not when deployed in a .jar or .war file.
Happy hunting.

properties files in jar with windows path

We are working on a project wehre there are some legacy jar files getting used in an application. Some of the JAR files have the ".properties" file path hardcoded in code (in class files).
private static Configuration getGlobalConfigInstance() {
if (global_config_instance == null)
try {
global_config_instance = (Configuration) new PropertiesConfiguration("D:/Apps/config/properties/MyWeb.properties");
} catch (ConfigurationException configurationException) {
configurationException.printStackTrace();
} catch (Exception exception) {
exception.printStackTrace();
}
return global_config_instance;
}
Now we are moving this application from Windows to Linux, is there a way to use these JAR files without recompiling?

can I get the directory of another file?

I have created an auto-updater for my java program. but at the end of the download it downloads the file to desktop. I can to get where is the program file and update it?
this is my code:
#Override
public void run() {
if(!Debug) {
try {
FileUtils.copyURLToFile(new URL("fileurl"), new File(System.getenv("APPDATA") + "\\file.zip"));
UnzipUtility unzip = new UnzipUtility();
File deskfile = new File(System.getProperty("user.home") + "/Desktop/file.jar");
if(deskfile.exists()) {
deskfile.delete();
}
unzip.unzip(System.getenv("APPDATA") + "\\file.zip", System.getProperty("user.home") + "/Desktop");
File file = new File(System.getenv("APPDATA") + "\\file.zip");
file.delete();
Successfull = true;
} catch (IOException e) {
Successfull = false;
}
try {
Updater.sleep(0L);
}catch(Exception e) {
e.printStackTrace();
}
}
}
this is the code present in my external updater jar and I need to find the main program directory what can I do?
For example, if the main program is in any other directory except the Desktop, the update will always download it to the desktop ... I need it to change the file that executes the command to start the updater

If your external updater is in the same directory as your mail application you can use:
System.getProperty("user.dir");
This will give you the current folder. You can find more details here: https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
If this is not the case i see the following options:
ask the user before updating for the installation folder
store the installation folder in property file inOS user data // update jar folder.
regards, WiPu

My .jar file won't open MP3 files (I'm using Jlayer - JZoom library)

I did this small Java project that in it's turn opens different MP3 files. For that I downloaded the JLayer 1.0.1 library and added it to my project. I also added the MP3 files to a package on my project -as well as some JPG images- so as to obtain them from there, and I'm using a hashmap (mapa) and this method to get them:
public static String consiguePath (int i) {
return AppUtils.class.getClass().getResource("/Movimiento/" + mapa.get(i)).getPath();
}
so as to avoid absolute paths.
When I open an MP3 file I do this:
try {
File archivo = new File(AppUtils.consiguePath(12));
FileInputStream fis = new FileInputStream(archivo);
BufferedInputStream bis = new BufferedInputStream(fis);
try {
Player player = new Player(bis);
player.play();
} catch (JavaLayerException jle) {
}
} catch (IOException e) {
}
The whole thing runs perfectly in NetBeans, but when I build a .jar file and execute it it runs well but it won't open the MP3 files. What called my attention is that it doesn't have trouble in opening the JPG files that are on the same package.
After generating the .jar I checked the MyProject/build/classes/Movimiento folder and all of the MP3 files were actually there, so I don't know what may be happening.
I've seen others had this problem before but I haven't seen any satisfactory answer yet.
Thanks!

Change the consiguePath to return the resulting URL from getResource
public static URL consiguePath(int i) {
return AppUtils.class.getClass().getResource("/Movimiento/" + mapa.get(i));
}
And then use it's InputStream to pass to the Player
try {
URL url = AppUtils.consiguePath(12);
Player player = new Player(url.openStream());
player.play();
} catch (JavaLayerException | IOException e) {
e.printStackTrace();
}
Equally, you could just use Class#getResourceAsStream
Resources are packaged into your Jar file and can no longer be treated as Files

Cannot load properties from jar

I have small app and I tested and packed to jar and am trying to run it but I have error.
Here is my project structure:
src
-kie.template
----- ServerMain.java ==> Class with main
-kie.template.util
---- PropUtils.java
---- server.properties
target
-kietemplate.jar
---- lib
In the main method, PropUtils class reads properties.
public class PropUtils {
private static final String PROPERTIES = "server.properties";
public static Properties load() {
Properties properties = new Properties();
InputStream is = null;
try {
properties.load(PropUtils.class.getResourceAsStream(PROPERTIES));
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is!=null) try{is.close();}catch(IOException e){}
}
return properties;
}
}
}
When I run the ServerMain class directly, it works fine. But after I packed it to jar and run, it shows error:
java -cp lib -jar kietemplate.jar
Caused by: java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at au.org.jeenee.kie.template.util.PropUtils.load(PropUtils.java:26)
The properties file is in the directory when I look into the jar file.
jar tf kietemplate.jar
Any help would be appreciated very much.
EDIT:
I changed the logic to read properties:
Properties properties = new Properties();
InputStream is = null;
try {
File file = new File("server.properties");
is = new FileInputStream(file);
properties.load(new InputStreamReader(is));
} catch (IOException e) {
e.printStackTrace();
} finally {
if (is!=null) try{is.close();}catch(IOException e){}
}
It requires the properties file in parent directory of the jar file.

Your code works fine on my computer, both from the JAR and the filesystem.
A possible cause for that behaviour is the filesystem being case insensitive, but the jar file being case sensitive. But we really can't tell from the source code alone.