The program is unable to run saying "Could not find or load main class". Enhance For Loop Example and Puzzle in Java. @Unknown, can you provide more details about your situation, may be we can guide you in the right direction. if you use winrar or winzip, you can see class files inside JAR on Windows. Subham Mittal has worked in Oracle for 3 years . (Running from Linux terminal)javac -cp ./org.json.jar Snippet.javajava -cp ./org.json.jar:. It helped me a lot as beginner. Hello, I am getting "Error: Could not find or load main class Server" on Eclipse. Hello @Nikita, did you able to run the program from command line or you still have some error? Hi All, am unable find the file.. (Could not find main-class) am using J2se 1.4 and Jboss 4.0 i have created all my class file and make it as JMSconsumer.jar Not sure what is wrong, can you please help? Program will exit." com.ClassName, I think I have discussed this in the article as well. Contact Information #3940 Sector 23, Gurgaon, Haryana (India) Pin :- 122015. contact@stechies.com -- New I have a folder on my desktop called ’opennlp’ where my .class file is in.So, I followed the instructions and in my command line returned to the desktop to run the following command: java opennlp.OpenNlpTestHowever, I still get the following error:Exception in thread "main" java.lang.NoClassDefFoundError: opennlp/tools/util/ObjectStreamat java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2625) at java.lang.Class.getMethod0(Class.java:2866) at java.lang.Class.getMethod(Class.java:1676) at sun.launcher.LauncherHelper.getMainMethod(LauncherHelper.java:494) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:486)Caused by: java.lang.ClassNotFoundException: opennlp.tools.util.ObjectStream at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) ... 6 moreI hope you can help me. Main class defined in the manifest.mf file and … Thanks! In accordance with the law of 8th December 1992, you can access the database containing your personal data and modify this information at any time by contacting Link to Media … I tried to run java program from command line but i am still getting the same issue. I added dll of the c program in java build path. Thanks a lot, Even without any package one can get this error.The note touches upon this by saying CLASSPATH=%CLASSPATH%; must be there to include the current directory.I got this error when I just used set classpath=c:\Java\jdk1.8.0_211;c:\Json\json-simple-1.1.1.jarThe above will not pick a class from the current directory )c:\Json)set classpath=;C:\Java\jdk1.8.0_211;c:\Json\json-simple-1.1.1.jar - solved itor better to useset classpath=%CLASSPATH%;C:\Java\jdk1.8.0_211;c:\Json\json-simple-1.1.1.jar. *, "My first program in Java, HelloWorld !! thank you! JNLP error: Could not find main class (JNLP and Web Start forum at Coderanch) Hello Javier, by scheduled task do you mean running your Java program as windows service? Sadly not. Copyright by Javin Paul 2010-2018. "); rno = sc.nextInt(); }}class Test extends Student{ int mrk1,mrk2; public void mrks() { Scanner m = new Scanner(System.in); System.out.println("Enter the marks of 1st subject "); int m1 = m.nextInt(); System.out.println("Enter the marks of 2nd subject "); int m2 = m.nextInt(); mrk1 = m1; mrk2 = m2; } public void display() { System.out.println("Name of the student:- " + name); System.out.println("Roll no. Apparently, I ran it as: >java dto\Helloinstead of>java dto.Hello. Great Explanation. All that thinking. Your description is really great and I thought FINALLY my problem is over. your welcome @Ganesh, glad you find this tutorial useful. *;class Student{ int rno; String name; void info() { Scanner sc = new Scanner(System.in); System.out.println("Enter the name of the student "); name = sc.next(); System.out.println("Enter the Roll no. Can you please describe your problem in little more detail? *;public class JDBCQuery{ public static void main (String[] parameters) { Connection connection = null; try { DriverManager.registerDriver(new com.ibm.as400.access.AS400JDBCDriver()); connection = DriverManager.getConnection ("jdbc:as400://" + system); DatabaseMetaData dmd = connection.getMetaData (); Statement select = connection.createStatement (); ResultSet rs = select.executeQuery ( "SELECT * FROM " + collectionName + dmd.getCatalogSeparator() + tableName); ResultSetMetaData rsmd = rs.getMetaData (); while (rs.next ()) { for (int i = 1; i <= columnCount; ++i) { String value = rs.getString (i); if (rs.wasNull ()) value = ""; System.out.print (format (value, columnWidths[i-1])); System.out.print (" "); } System.out.println (); } } catch (Exception e) { System.out.println (); System.out.println ("ERROR: " + e.getMessage()); } finally { try { if (connection != null) connection.close (); } catch (SQLException e) { // Ignore. } To check, I used 'Associate a file type or protocol with a specific program', selected .jnlp, browsed to 'javaws.exe', and confirmed the change. No Package. *; import java.applet. Eclipse - main class not found errorI was also getting same problem in Eclipse i.e. Tell the // system to repaint the applet, to show the new values. g.setColor(Color.white); g.fillRect(x, y, 35, 35); g.setColor(Color.black); g.drawRect(x, y, 34, 34); if (val > 1) // upper left dot g.fillOval(x+3, y+3, 9, 9); if (val > 3) // upper right dot g.fillOval(x+23, y+3, 9, 9); if (val == 6) // middle left dot g.fillOval(x+3, y+13, 9, 9); if (val % 2 == 1) // middle dot (for odd-numbered val's) g.fillOval(x+13, y+13, 9, 9); if (val == 6) // middle right dot g.fillOval(x+23, y+13, 9, 9); if (val > 3) // bottom left dot g.fillOval(x+3, y+23, 9, 9); if (val > 1) // bottom right dot g.fillOval(x+23, y+23, 9,9); } void roll() { // Roll the dice by randomizing their values. An OK button closes the failure message. Hello @mithilesh, what did you try? import java.awt. funciona! Finally explained well, whithout a stupid advice to set classpath environmental variable for simple programs. What do you think about this tiny ad? I am running Fedora (Linux). When I went to run it I got the class not found error as expected. Error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher. It worked! Hi, I am getting 'error: could not find or load main class' when I am trying run a java program with multiple classes, but it is working fine with a single class. Powered by, "Error: Could not find or load main class XXX", /** import java.sql. Blog about Java, Programming, Spring, Hibernate, Interview Questions, Books and Online Course Recommendations from Udemy, Pluralsight, Coursera, etc, Another common cause of this error is invoking java command with .class file. PS: There is nothing wrong with the TrainingDNA.jar since it runs fine on 32bit if I don't use JNLP and double click and run it. roll(); } public void mouseReleased(MouseEvent evt) { } public void mouseClicked(MouseEvent evt) { } public void mouseEntered(MouseEvent evt) { } public void mouseExited(MouseEvent evt) { } } // end class ClickableDiceCan you solve this errors in my program. Project structure:example/Snippet.javaexample/org.json.jarI've to include the jar in classpath and i'm executing the program from example directory. Atom Hello Jesse, Can you share how you are running your program in Eclipse? When I run it using CMD it displays an error "Error: Could not find or load main class".I even tried Wrapping the Jar in an .exe file using Launch 4J with the same results. Hi, I am trying to call one c function from java via JNI. Just deleting the run configuration and re-creating it by running the class as right click, Run as Java program will fix the error. To solve, use the full class name, including package name, in the java command. My error was resolved after deleting existing run configuration where User entry was not pointing to default classpath. Error: Could not find or load main class ClassName.class Caused by: java.lang.ClassNotFoundException: ClassName.class 1. What might be the reason for this? com.jni.JniJavaSidePgm, Running from outside the package did the job for me, thanks! The error indicates that the java command failed to find or load the main class. does solution given here helped you? I commented out the package statement in the source and added "-cp ." Snippet. When the error occurs, the JVM shows the following error message on the console: whenever I run my program either by Run configurations or right click and run as Java program, I get the popup complaining about could not find or load main class. java and javac cmd are working properly on normal cmd line so it shows that environment variable is working properly but when i run any programthen it can compile only and make a byte code but i cannot run this class file via javac tool.it shows Error: Could not find or load main class.plz resolve this problem send your response on gauravlodhi41@gmil.com. int die2 = 3; public void init() { // To initialize the applet, register the applet to listen // for mouse events on itself. I copied your source for HelloHP and saved it as HelloHP.java. Hello Mahek,try changing the name of your program to the name of the project class .It worked for me. *;import java.io. Hey Javin,Thanks a lot. For more java articles ,Click here to Subscribe JavaHungry die1 = (int)(Math.random()*6) + 1; die2 = (int)(Math.random()*6) + 1; play(getCodeBase(), "click.au"); repaint(); } public void mousePressed(MouseEvent evt) { // When the user clicks the applet, roll the dice. User is set to run wheter logged in or not. This worked. } System.exit (0); }}If I don't include any of the connection information the script outputs the error messages correctly (removed due to char limit) so it looks to me that it has an issue with the JTOpen driver. java -cp . Thank you for this help. @Anonymous, glad to hear that solution worked for you. It was really usable. (same as previous)# java -classpath /root JDBCQuery 172.1.1.1 PSPF PRICEException in thread "main" java.lang.NoClassDefFoundError: com/ibm/as400/…. To avoid this error, you need to specify the absolute (including packages) name of the .class file (just name) which is in the current directory. See this exampleC:\Users\WINDOWS 8\workspace\Demo\target\classes>java dto.HelloHP My first program in Java, HelloWorld !! I was able to execute the program but after removing the package name from the program file. of the student:- " + rno); System.out.println("Marks of 1st subject:- " + mrk1); System.out.println("Marks of 2nd subject:- " + mrk2); } public static void main(String args[]) { System.out.println("B227 KK"); Test te = new Test(); te.info(); te.mrks(); te.display(); System.out.println("B227 KK"); }}I am getting a error in this program, awww it got worked for me, like below- cd ..- java firstPackage.HelloWorld. The die is // 35 by 35 pixels in size. Thank you a lot! addMouseListener(this); setBackground( new Color(200,200,255) ); } public void paint(Graphics g) { // The paint method draws a blue border and then // draws the two dice. Java just need name of your main class without any extension. Code is below, it is just trying to connect to an iSeries using the IBM jtopen 9.1 tool:import java.sql. Thanks for your suggestion Andrei. Re: jnlp failure "Could not find the main class". I then opened a terminal window, went to where I saved the file and compiled it from the command line. No one any where else was able to get that across. I completely forgot about the "right click" and "Run As" Java Application! Thanks for this article, it was really usefull :-), You don't know how much your steps helped me to solve my problem. Can applets with JDIC run on Win7 with IE9. You just saved me from banging my head against the wall! Thank you! ... Java Web Start (Jnlp) Tutorial; mkyong Founder of Mkyong.com, love Java and open source stuff. *; import java.awt.event. *; public class ClickableDice extends Applet implements MouseListener { int die1 = 4; // The values shown on the dice. 3 Ways to Prevent Method Overriding in Java - Priv... How to get current stack trace in Java for a Threa... How to Convert Map to JSON to HashMap in Java? ). Difference Between java and javaw Commands from JDK. However, When I create a Jar File of the application and try to run it by double clicking, Nothing Happens. On the PC concerned, .jnlp is associated with 'Java (TM) Platform SE binary'. Difference between List and Set in Java Collection. It also has full permissions on the program path and it has execution permissions on the java.exe path as well. Solved issue by copying my .java to Notepad and deleting top Package line and Save, then recompiling with javac. Please Note that both the above paths have "java" command while one is from "jre" the other is from "jdk" Other global variables are as following in ".bash_profile" Doesn't it hurt? On opening and examining the downloaded jnlp file, it seems to be OK to me. Still failed. [How to ask questions] [Donate a pint, save a life!] I am unable to compile main class and in my directory byte code is not created for the main class.. @raghu, what error are you getting, can you post your error here? I am new to Java, so wrote a simple program that takes your name, and displays "Hello ". i still get the same error, the app runs in netbeans but not in dist folder. This doesn't work for me. D:\sample>java Example Error: Could not find or load main class Example Caused by: java.lang.ClassNotFoundException: Example Solution. Thank you for this page, and related help. HelloHPMy first program in Java, HelloWorld !! Send comment I have read and accept the privacy policy Red Link to Media collects personal data for internal use only. Error: Could not find or load main class HelloJava Caused by: java.lang.ClassNotFoundException: HelloJava 오타도 없고, 클래스명과 파일명도 일치하고, 환경변수 Path 설정도 했는데 이러한 오.. I have read thousands of online fixes including this and I cant seem to find the solution.My Objective is create a standalone .exe file which I can then share with a friend or run on any windows machine.please help. i am using jre and jdk1.8.0_73, Hi, Is anyone available now.I get an error while running a java program from command prompt. Yo lo resolví así y con la siguiente configuración de CLASS_PATH y path.W10 64Open Java jdk-13.0.1Apache Netbeans 11.2JAVA_PATH = C:\JavaOpen\jdk-13.0.1\PATH = %JAVA_PATH%\bin\En el CMD, entrar a la carpeta ...\target\classesy ahí llamar a la clase main del programa, ejemplo : ...\target\classes>java openjava.holamundo.inicio(En mi proyecto la ruta de salida es: C:\Users\Usuario\Documents\NetBeansProjects\holaMundo\target\classes\openjava\holamundo)Y listo! Thanks again. 编译HelloWorld.java生成字节码文件HelloWorld.class，运行HelloWorld.class报错：Error: Could not find or load main class。 【原因分析】 当前目录是.class文件所在目录，要运行.class字节码文件，需要将当前目录加入系统变量CLASSPATH，系统才能找到当前目录下的Java类。 【解决方案】 HelloHPError: Could not find or load main class HelloHP[vince@Vince2 sample]$ javac HelloHP.java[vince@Vince2 sample]$ java -cp . Hello, I have followed your blog and I am still facing the same issue.Please Assist me on https://stackoverflow.com/questions/49738153/java-cannot-load-or-find-main-class or assist me here. I kept trying to go to Run | Run in Eclipse and in past exercises (I'm working out of the Head First Java book) I didn't have to do that. Using your help above was able to run my Java classes without a Package from the command line, but not Java classes with Package. *;import java.lang. I was looking for solution on this issue for over 3 hour , only now its work by your suggestions , after adding the environment variable CLASSPATH=%CLASSPATH%;. Any help would be GREATLY appreciate.# ls -lh /usr/lib/jvm/java-8-oracle/jre/lib/jt400.jar-rwx------ 1 root root 4.6M Feb 12 18:28 /usr/lib/jvm/java-8-oracle/jre/lib/jt400.jar. Hello @Robert, what did you try and what is not working? still not able to overcome with this problem. I'm getting really desperate... My app compiles fine with the -classpath switch under javac however if I try to run it with -cp or -classpath. ! How to run the program with the package name in the file? *;class scrolldemo{ public static void main(String args[])throws IOException,ClassNotFoundException { Scanner sr=new Scanner(System.in); Connection con=null; Statement stmt=null; ResultSet rs=null; int ch; //Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); try { //con=DriverManager.getConnection("jdbc:odbc:developer"); con=DriverManager.getConnection("jdbc:ucanaccess://C:\\Users\\User\\Desktop\\db.accdb"); stmt=con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY); rs=stmt.executeQuery("select * from student"); do { System.out.println("1) First Record"); System.out.println("2) Last Record"); System.out.println("3) Previous Record"); System.out.println("4) Next Record"); System.out.println("5) Exit Record"); System.out.println("Enter your choice"); ch=sr.nextInt(); if(ch==1) { if(!rs.first()) { rs.first(); System.out.println(rs.getString(1)+" "+rs.getString(2)); } else { System.out.println("Already on first record"); } } else if(ch==2) { if(!rs.last()) { rs.last(); System.out.println(rs.getString(1)+" "+rs.getString(2)); } else { System.out.println("Already on last record"); } } if(ch==3) { if(rs.previous()) System.out.println(rs.getString(1)+" "+rs.getString(2)); else System.out.println("Already on first record"); } if(ch==4) { if(rs.next()) System.out.println(rs.getString(1)+" "+rs.getString(2)); else System.out.println("Already on last record"); } }while(ch!=0); rs.close(); stmt.close(); con.close(); } catch(SQLException e) { System.out.println(e); } new scrolldemo(); }} I am trying to run this program but i am getting an error could not find or load main class scrolldemo.I have saved the java file in " C:\Users\User\Desktop "I have set the classpath as "C:\Program Files\Java\jdk1.8.0_91\jre\lib\ext" as my ucanaccess.jar file is in this folder because my OS does not support Type1 driver.when i compile the program as "javac demo.java"and try to run as " java scrolldemo" I get an error "could not find or load main class scrolldemo"I used classpath to set the ucanaccess.jar file so that i wont get an error as "ClassNotFoundException"Please Help me. Error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher. Hello: Have you ever faced permissions issues on windows server 2012? Do you happen to have any clues on this situation? It depends how are you opening? It's on default package, and I have tried everything from cleaning the project, building the project and build automatically. Any suggestion for me to be able to run my jar file as java -jar test.jar, Thanks Man, You saved my day. How to convert lambda expression to method reference in Java 8? Difference between PriorityQueue and TreeSet in Java? (same as previous)# echo $CLASSPATH/usr/lib/jvm/java-8-oracle/jre/lib:.tried above with CLASSPATH unset too. It started working in 32bit java, did foll: Thanks for taking the time to share the solution with us! while Running it, I get the following error: run: Error: Could not find or load main class hello.world.HelloWorld Java Result: 1 BUILD SUCCESSFUL (total time: 0 seconds) [Onff-turn it on!]. to the java command. while the second command worked fine. Difference Between java.util.Date and java.sql.Dat... How to Convert JSON array to String array in Java ... UNIX Command Tutorial, Tips and Examples for Begin... 10 JDK 7 Features to Revisit, Before You Welcome J... How to Convert Local Time to GMT in Java - Example... 10 Examples of CUT command in UNIX and Linux. Helped my solve my first Java issue. @mithilesh, you need to run the program outside of the directory e.g. while the second command worked fine. Thanks for great explanation, When I build my .jar file once I try to java -jar I get hte following "Javassist version 3.22.0-GACopyright (C) 1999-2017 Shigeru Chiba. @Anonymous, glad that this tutorial helped you to solve your problem. The Appplication compiles and runs as expected with BlueJ. since your main class is inside com.jni package, you must run outside that directory and provide a fully qualified name e.g. The val parameter gives the // value showing on the die (that is, the number of dots). "); }}[vince@Vince2 sample]$ java -cp . Update - I made a few changes and got it to work. I then went to the parent directory and tried again. Following are the scenarios where this error could occur − Difference between State and Strategy Design Patte... Recursive Binary Search Algorithm in Java - Exampl... What is String args[] Argument in Java Main method, How to Create, Update and Remove Soft link in UNIX. I spent hours to find a solution for this error. you're awesome my friend! * Error :Could not find or load main class I am trying to run a java program via notepad and i am using window 7 32 bit. if package is com then run the command outside of the com directory with full classname i.e. I have tried every possible thing from setting the path and classpath to using dto but the result is the same. g.setColor( Color.blue ); g.drawRect(0,0,99,99); g.drawRect(1,1,97,97); drawDie(g, die1, 10, 10); drawDie(g, die2, 55, 55); } void drawDie(Graphics g, int val, int x, int y) { // Draw a die with upper left corner at (x,y). while if I run with java -cp test.jar com.test.boot.Mainkt I get correct execution. ", "C:\Users\WINDOWS 8\workspace\Demo\target\classes", Error: Could not find or load main class in Java [Solved], set CLASSPATH environment variable in Windows, Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld, NoClassDefFoundError and ClassNotFoundException, Understanding the Java Virtual Machine: Class Loading and Reflection, Core Java for the Impatient - Covers Java SE 8, Post Comments @dArch, thanks! If you call this java HelloWorld.classyou will seeCould not find or load main class HelloWorld.class, Thank you so, so much for the thorough explanation. import java.util. I was trying to figure out as to why it keep prompting that error message.I had multiple folders/packages to compile. We are getting the "Error: Could not find or load main class" with the sched task user. Please Note that both the above paths have "java" command while one is from "jre" the other is from "jdk" Other global variables are as following in ".bash_profile" * Simple Java program to demonstrate following error @Javin: Thank you for replying. hey. 编译HelloWorld.java生成字节码文件HelloWorld.class，运行HelloWorld.class报错：Error: Could not find or load main class。 【原因分析】 当前目录是.class文件所在目录，要运行.class字节码文件，需要将当前目录加入系统变量CLASSPATH，系统才能找到当前目录下的Java类。 1.1 Reviews a simple Java Hello World, no package. By the way, there are more to it e.g. I debug it by debug as Java program and found that it was one of the dependent JAR which was available in classpath but Eclipse was not seeing it. Most of the time you just need to either correct your CLASSPATH environment variable or run your program with java-cp or -classpath option. Hello,thank you for your help. Difference between Stub and Mock object in Java Un... 10 Examples of Converting a List to Map in Java 8. Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop, current ranch time (not your local time) is, https://coderanch.com/wiki/718759/books/Building-World-Backyard-Paul-Wheaton, This is the error with the cattle game posted on website. Why? I have included the compile below with the error from not having the classpath from completeness.java version "1.8.0_121"Java(TM) SE Runtime Environment (build 1.8.0_121-b13)Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)# javac JDBCQuery.javaJDBCQuery.java:71: error: package com.ibm.as400.access does not exist DriverManager.registerDriver(new com.ibm.as400.access.AS400JDBCDriver()); ^# javac -classpath /usr/lib/jvm/java-8-oracle/jre/lib/jt400.jar JDBCQuery.java## java JDBCQuery 172.1.1.1 PSPF PRICEException in thread "main" java.lang.NoClassDefFoundError: com/ibm/as400/access/AS400JDBCDriver at JDBCQuery.main(JDBCQuery.java:71)Caused by: java.lang.ClassNotFoundException: com.ibm.as400.access.AS400JDBCDriver at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 1 more# java -cp /root JDBCQuery 172.1.1.1 PSPF PRICEException in thread "main" java.lang.NoClassDefFoundError: com/ibm/as400/…. pls help. but after doing this , i am getting the error "Could not find or load main class".I am using Cygwin & eclipse.c program---------------#include < stdint.h >#include "JniCSidePgm.hpp"#include < stdio.h >#include < jni.h >int sum(int v1,int v2){ return v1+v2;}java program------------------package com.jni;public class JniJavaSidePgm { static { System.loadLibrary("JniCSide"); // Load native library at runtime // hello.dll (Windows) or libhello.so (Unixes) } // Declare a native method sayHello() that receives nothing and returns void private native void sum(int v1,int v2); // Test Driver public static void main(String[] args) { new JniJavaSidePgm().sum(1,2); // invoke the native method }}, Hello Jaison, from where did you running your program? "Could not find the main class: [C:\Users\path through temporary Internet files to ]\servoy_client.jnlp. Very helpful explanation ... solved my issue w/o a fuss, thanks:-). Among these errors, could not find or load main class in Java, is one of them that occurs usually. Not working :( HELP!Getting error: Could not find or load main class. Understanding DATALOSS Advisory in Tibco Rendezvou... JUnit 4 Tutorial - Test Exception thrown by Java M... How to find current directory in Java with Example. I am trying to run this project called "hello user". I get an error could not find or load main class in my code how to fix it can anyone help me. давала ошибку "Could not find or load main class" решилось таким образом. The compilation wasn't the issue but the running of the main file in a child directory, is. Our program runs perfectly if you just double click on it, but it doesn't as a scheduled task. Also set a light blue // background color. java -classpath "jar_name" com.list_of_your_packages.launcher То есть нужно было указать сам джарник в classpath, а потом указать полный путь к классу с main методом Difference between Connected vs Disconnected RowSe... What is java.library.path , How to set in Eclipse IDE. What am I doing wrong? I Created a JavaFX Application with BlueJ. Thanks for the good article.In the article echo %CLASSPATH should be echo %CLASSPATH% in windows 10 home from the command line. Under no circumstances will your data be transferred to third parties without your permission. Server is the main class, contains main() method but somehow Eclipse is not able to find it. What have you put as Main Class etc? Here is the output from my attemptvince@Vince2 sample]$ javac HelloHP.java[vince@Vince2 sample]$ java HelloHPError: Could not find or load main class HelloHP[vince@Vince2 sample]$ cd ..[vince@Vince2 hsqldb]$ java dto.HelloHPError: Could not find or load main class dto.HelloHPThank you in advance. 10 OOP design principles programmer should know. I don't know how I didn't know this as an expert java developer, Thanks, this article is really problem-solving for me, class exceptionDeom2{ public static void main(String args[]) { try{ System.out.println(3/0); System.out.println("in try"); } catch(ArithmeticException e){ System.out.println("Exception"+e.getMessage()); } /* finally{ System.out.println("learning Exception Handeling"); }*/ }}Error:- E:\java\Java_Programs\Exception handling> java exceptionDemo2Error: Could not find or load main class exceptionDemo2PS E:\java\Java_Programs\Exception handling>. We may error could not find or load main class while running the Java class. ( Dealing with org.hibernate.LazyInitializationExcep... What is bounded and unbounded wildcards in Generic... What is interface in Java with Example - Tutorial. One question: if I open my JAR file (already compiled) in the Command Prompt, it works, but if I open it directly from a folder in Windows, it doesn't show errors but quickly exits.

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