run jar file from command line with main class

Can't execute jar- file: "no main manifest attribute", Eclipse "Error: Could not find or load main class". rev2022.11.3.43005. isn't in the current path on most systems. How to draw a grid of grids-with-polygons? Use zip to look at the file and make sure it has a path of "classes". Is there a way to make trades similar/identical to a university endowment manager to copy them? Are cheap electric helicopters feasible to produce? Launch Configuration identifies which program should be exported. This error comes even if you miss "-" by mistake before the word jar. App. You can create your jar without Main-Class in its Manifest file. Put them in a package, make sure the directory tree matches the package tree, and use the fully qualified name of the class: Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. I am having this classes in one package so how i can i do this. Should we burninate the [variations] tag? I know this is an old question, but I had this problem recently and none of the answers helped me. Does squeezing out liquid from shredded potatoes significantly reduce cook time? For this class, we will use jar cvfm: c: represents the create command, as we wish to create a new jar file. More details regarding how to run a jar file can be found in our article Run JAR Application With Command Line Arguments. Should we burninate the [variations] tag? An Example We want to execute the main method in the class MyClass in the package MyPackage when we run the JAR file. Making statements based on opinion; back them up with references or personal experience. Example 1: open jar file with command prompt For Linux: java -jar <filename>.jar Related example codes about java to jar code snippet. Once you are sure that Java is installed in your machine, path and classpath are proper, just execute the following command and it will run your Java program from the JAR file itself: $ java -jar Hello.jar How can I best opt out of this? winrar, 7-zip => open MANIFEST.MF file under META-INF => then check whether there exists an attribute called Main-Class and is set properly. in IntelliJ, I get this error when trying to add the lib folder from the main project folder to an artifact. Put TestClass.class in a folder classes/. Specifying the Main Class The 'jar' command line tool is included in the JDK, so if you can compile on your machine, you'll also have access to the jar utility. A fully qualified path is preferred here as well. How do I convert a String to an int in Java? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. What value for LANG should I use for "sort -u correctly handle Chinese characters? com/mycomp/myproj/dir2/MainClass2.class com/mycomp/myproj/dir3/MainClass3.class 3 Ways To Open A Jar File. How do I read / convert an InputStream into a String in Java? Note that the arguments are separated with space. Why does it matter that a group of January 6 rioters went to Olive Garden for dinner after the riot? Should we burninate the [variations] tag? And I have another Java class given below. I also thanked you in the comment as well because your answer was the only one that was useful. How can i extract files in the directory where they're located with the find command? Why does the sentence uses a question form, but it is put a period in the end? We can add our java file to manifest file so that we no need to pass the class name to java command while running it from command line. Fastest way to determine if an integer's square root is an integer. In order to run the jar, just type the following command in the windows console: java -jar <name-of-jar-with-extension> eg java -jar executable.jar 2. If you have multiple main methods in your project and want to specify which main method to run when typing sbt run, add a line like this to your build.sbt file: // set the main class for 'sbt run' mainClass in (Compile, run) := Some ("com.alvinalexander.Foo") This class can either contain a main method, or extend the App trait. What is the best way to show results of a multiple-choice quiz where multiple options may be right? execute a main class from a jar, Have a class that acts as a controller. com/mycomp/myproj/dir4/MainClass4.class. all 3 folders (folder1, folder2 and folder3) as well as the executable.jar need execute-privilege for the current user, otherwise the error "Could not find or load main class " is returned. The fully qualified class name, as written in my answer, is separated by dots: How to run the main method of a Java class in a jar? This is rather cumbersome in my opinion. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I had a similar problem which I could solve by granting execute-privilege for all parent folders in which the jar-file is located (on a linux system). Connect and share knowledge within a single location that is structured and easy to search. How can I best opt out of this? It has directory structure for the main classes as follows: com/mycomp/myproj/dir1/MainClass1.class What I usually do is to get the jar of the H2 dependency and: java -cp h2.jar org.h2.tools.Shell. Just use this: java -cp MyJar.jar com.example.Main Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Although the default manifest file contains just two entries, but complex manifest files can have way more. What is the best way to sponsor the creation of new hyphenation patterns for languages without them? How can I get a huge Saturn-like ringed moon in the sky? next step on music theory as a guitar player. IntelliJ I want to be able to run each one of those as per the need. The two most likely-looking things at this point are that either the file in the jar is not stored in a directory WITHIN THE JAR, or that it is not the correct file. ), By trying the above I am getting the error Exception in thread "main" java.lang.NoClassDefFoundError: cucumber/api/cli/Main at com.company.project.demo.bdd.runner.Execute.main(Execute.java:20) Caused by: java.lang.ClassNotFoundException: cucumber.api.cli.Main at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) 1 more, if you on linux use ':' instead of ';' for adding dependent jars, the classpath separator ':' is ';' on windows. Find centralized, trusted content and collaborate around the technologies you use most. You can use the e option of jar command to specify the entry point of your program, ie. Displays the command-line help for the jar command or optionally the compatibility help. When I choose another option "copy to the output directory", it solved the problem. substituting the actual full path of the folder containing your jar files for absolutepath.. Then, after re-loading the shell (or running the bash command), you should be able to type junitr hw1.SomeDataStructureTest into the shell (from wherever your class files are) and it will run JUnit!. Not able to run test.xml file through maven and command line in java selenium; If I run a plugin from the command line at the root pom, what does it do when traversing modules? How to run a class from Jar which is not the Main-Class in its Manifest file Solution 2: You can also add the manifest, with the following command: jar -uvfe your.jar foo.bar.Baz java -jar your.jar # tries to run main in foo.bar.Baz Solution 3: Of course! Can I spend multiple charges of my Blood Fury Tattoo at once? After you have set the Main-Class header in the manifest, you then run the JAR file using the following form of the java command: java -jar JAR-name The main method of the class specified in the Main-Class header is executed. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to run a class from Jar which is not the Main-Class in manifest file: I have a JAR with 4 classes, each one has Main method. Can't execute jar- file: "no main manifest attribute". Connect and share knowledge within a single location that is structured and easy to search. java -cp myJavaJar.jar com.mycomp.myproj.dir2.MainClass2 /home/myhome/datasource.properties /home/myhome/input.txt, Each JAR file contains a manifest file that describe the features of the archive. Can't execute jar- file: "no main manifest attribute", Can't start Eclipse - Java was started but returned exit code=13. Here, is what a default manifest file looks like. For instance, "cd /MyEclipseWorkspace/MyProject/bin" If, instead, jar uses the absolute path of the class files it may fail with "could not find or load main class" error. Executable Jar Files. If you use package names, it won't work with folders containing dots (Error: Could not find or load main class). is the TestClass in the package classes? What do you mean when you say that you want 'to use' that class? class which you normally want to invoke when launching your Java application.. Not the answer you're looking for? How do I efficiently iterate over each entry in a Java Map? Try running the same TestClass via command line instead of Eclipse. We'll use the -cp option (short for classpath) to specify the JAR file that contains the class file we want to execute: java -cp jar-file-name main-class-name [args ] How to help a successful high schooler who is failing in college? 1. Placing and using the lib folder in the src folder works. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Making statements based on opinion; back them up with references or personal experience. I had all my compiled class files in target/classes, which are not packages in my case. We run jar files using the java command. These code snippets will help you about run a .jar file from command prompt. If you have your setup with Maven project -- make sure that the following match your JDK in the pom.xml file. --version Prints the program version. to make the package jar file. java -cp the\path\to\jarFile.jar SecondLevelJsonCreator 3 "C:/path/filename.xls" You should generally avoid putting classes in the default package. Is a planet-sized magnet a good interstellar weapon? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Default manifest file is named as MANIFEST.MF and is present in the META-INF sub-directoryof archive. Before you execute this command, make sure . I am trying to run it from command-line on Linux box. What is the deepest Stockfish evaluation of the standard initial position that has ever been done? You can run JAR packaged applications with the Java launcher ( java command). MATLAB command "fourier"only applicable for continous time signals or is it also applicable for discrete time signals? Note 1: As I note in the Summary, you'll probably want to use a tool like sbt-assembly for larger . SQL PostgreSQL add attribute from polygon to all points inside polygon but keep all points not just those that fall inside polygon. This is because the packages inside App.jar don't match the actual packages in the project. If a creature would die from an equipment unattaching, does that creature die with the effects of the equipment? Now we need to specify the name of the class that contains the main method. Why does the sentence uses a question form, but it is put a period in the end. 4.3. How do I test a class that has private methods, fields or inner classes? Thanks for contributing an answer to Stack Overflow! What is the best way to sponsor the creation of new hyphenation patterns for languages without them? Example 2: compile jar file command jar cvf example.jar * Example 3: java to jar For Linux: java -jar <filename>.jar jar cvf example.jar * Run jar with dependencies from the command line 14,299 Solution 1 When you use java -jar, dependencies are not specified on the command line. my ant jar task had a prefix of "/" but needed "". Instead it requires a complete folder hierarchy. Efficiency of Java "Double Brace Initialization"? If you are not within the directory where myJavaJar.jar is located, then you can do: java -cp /location_of_jar/myJavaJar.jar com.mypackage.myJavaClass, java -cp c:\location_of_jar\myJavaJar.jar com.mypackage.myJavaClass. This is very difficult to debug without complete information. Put them in a package, make sure the directory tree matches the package tree, and use the fully qualified name of the class: Default Manifest.mf file and examples. What is the best way to show results of a multiple-choice quiz where multiple options may be right? I was trying to to be helpful for noctua. Open a command prompt and cd into your project folder. For example: java SecondLevelJsonCreator 3 "C:/path/filename.xls". Find the one that runs the class containing your main() method. Package Deceleration in classes.TestClass is package classes; But I still keep getting the error message. extract your jar using any archive tool e.g. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Creating an executable jar file of the project; Run the main method using executable jar file; . 2022 Moderator Election Q&A Question Collection. I know that manifest file can be modified to specify the Main class but since only one class can be mentioned, that does not help. This is the right way to execute a .jar, and whatever one class in that .jar should have main() and the following are the parameters to it : Thanks for contributing an answer to Stack Overflow! @Corral's comment should not be ignored. Below is from official java version jrt-fs.jar from java 11. And you need to create the jar file so that TestClass.class appears with a path of classes. I had a weird issue when an incorrect entry in MANIFEST.MF was causing loading failure. (For instance, if you see bin/com/mypackage/myClass, you should have cd'ed into bin to build your jar file; what you have won't work. Solution. The first parameter to the jar command indicates what the following parameters will mean. Connect and share knowledge within a single location that is structured and easy to search. 2022 Moderator Election Q&A Question Collection, How to run specific main class of a jar in docker and pass program argument. Step 4 (Write main class and compile it): Move to your proj2 directory. isn't in the current path on most systems. Asking for help, clarification, or responding to other answers. It will be certainly Yes if your program was Compiled successfully. Best way to get consistent results when baking a purposely underbaked mud cake. Examples of jar Command Syntax. Is there an other way than going (cd) into the folder with the packages/classes? Do you have to put the full path if you are in the same directory as your jar? Run a Nonexecutable JAR with Arguments To run an application in a nonexecutable JAR file, we have to use -cp option instead of -jar. This was when I was trying to launch a very simply scala program: With an incorrect version, I was getting a cryptic message, the same the OP did. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA.
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