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just rename non-executable.jar to non-executable.zip.
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How to open java jar file in eclipse update#
So in order to make your file executable, you can directly update the manifest file of the jar through the following steps: This message means that your manifest file doesn’t explicitly set the path of the application’s entry point. Normally if you try to execute a non-executable jar file, you get ‘Failed to load Main-Class’ error. Where is the main class to be added in the generated MANIFEST.MF 3. You can still generate an executable jar without creating a manifest file, you just set the main class of your application and the jar tool automatically creates the manifest file, the following command does the job: jar cfe executable.jar com/programmer/gate/*.class Here, we set the path of the entry point class of the application to, note that it’s recommended to create the manifest file inside bin directory so that java can find your main class while execution without the need to explicitly set the classpath.Īfter creating the manifest file, open cmd as administrator and run the following command: jar cfm executable.jar manifest.txt com/programmer/gate/*.class P.S: it’s necessary to insert a new line at the end of the manifest file in order to successfully generate the jar file, otherwise ‘no main manifest attribute’ error is thrown. Going back to our example, we move to the bin directory of our project and create a file called manifest.txt as the following: Main-Class: The command accepts as input the manifest file as well as the list of compiled classes to be packaged in the jar. 2.1 Using manifest fileĪnother way to create an executable jar is through using the ‘jar’ command in the command line. In this section, we consider that you have already installed java on your machine, and you already added the java path to your PATH environment variable. The jar holds all the compiled classes along with their packages, in addition to a folder named as META-INF which holds a file called MANIFEST.MF, this is the file which makes the jar executable, since it holds the path of the main class of the application, without this file the jar cannot be executed. If you open executable.jar (using winrar or 7-zip tools), you will get something like this: We select our main class “HelloWorld” and click finish, eclipse then generates an executable jar file called executable.jar. In the next page select your main class (Launch configuration) and name the jar file as the following: Search for Runnable JAR file, then click next. Right click HelloWorld -> Export, then you get the following screen: Let’s consider a typical hello world example as the following:Įclipse provides a tool to generate an executable jar out of any standalone application, to do this: In this tutorial, we define the different ways to create an executable jar. A jar file is executable if it contains at least one entry point class with a main method.
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This thread implies that it should work but doesn't answer my question. Looking for ideas or thoughts or even an answer! I tried to give as much info as possible in hope of a quality answer. class): Could not find the main class: E:EclipseworkspaceHWorld.jar The only thing that looks really fishy to me is this (since a. Main-Class: .jarinjarloader.JarRsrcLoader My manifest looks like this: Manifest-Version: 1.0 jar file, it runs fine from the command line using the command "java -jar HWorld.jar"īut, when I try to execute the jar on its own (which supposedly should work) I get the following error and I don't know why: E:Eclipseworkspace>HWorld.jarĮxception in thread "main" : E:EclipseworkspaceHWorld/jarĬaused by: : E:EclipseworkspaceHWorld.jarĪt $1.run(URLClassLoader.java:200)Īt (Native Method)Īt (URLClassLoader.java:188)Īt (ClassLoader.java:307)Īt $AppClassLoader.loadClass(Launcher.java:301)Īt (ClassLoader.java:252)Īt (ClassLoader.java:320)Ĭould not find the main class: E:EclipseworkspaceHWorld.jar. tDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) My HelloWorld class looks like this: import I generated a very simple runnable jar file using Eclipse's "Export->Java->Runnable Jar File" function.