I have a Jar file with three classes P,Q,R all three contain static main function ...
I want to have multiple entries to the Jar file while running from command prompt
jar file name for eg: Main_classes.jar and in the Manifest file Main-Class set is class "P"
command i tried
java -cp Main_Classes.jar Q
gives me no class found exception...
Solution as below .
Contents of manifest file assuming all three files are under package myPackage :
Main-Class: myPackage.P
The jar file generation
javac -d . P.java Q.java R.java
jar -cvfm my.jar manifest.txt myPackage/*.class
To run the jar which has its own defined main-class as in manifest file
java -jar my.jar // Executes Class P
To run the jar with any of class Q or class R which have main as well
java -cp my.jar myPackage.Q //Executes class Q
java -cp my.jar myPackage.R //Executes class R
java -cp my.jar myPackage.P //Executes class P
Related
I'm just on:
https://openjfx.io/openjfx-docs/#modular
trying to create a jar I can run on other systems (that do not have the javafx libraries as would happen with a non-developer layman user) and they've told me to use this:
dir /s /b src\*.java > sources.txt & javac --module-path %PATH_TO_FX% -d mods/hellofx #sources.txt & del sources.txt
What is mods/
Where is that supposed to be? Are they talking about out/ ?
The doc you have linked refers to this sample.
If you clone the sample, and follow instructions on how to compile and run the project, the first command can be divided in three parts:
dir /s /b src\*.java > sources.txt & \
javac --module-path %PATH_TO_FX% -d mods/hellofx #sources.txt & \
del sources.txt
The first part just gets all the Java files in the src path and adds that to sources.txt file:
C:\path\to\hellofx\src\module-info.java
C:\path\to\hellofx\src\hellofx\HelloFX.java
The second part calls the javac command (see reference) to compile the content of sources.txt, adding the required --module-path option to include the JavaFX modules, and also adding the output or destination -d option:
-d directory
Sets the destination directory for class files. If a class is part of a package, then javac puts the class file in a subdirectory that reflects the package name and creates directories as needed.
This means that we are going to compile hellofx.HelloFX.java into the directory mods/hellofx, resulting in:
C:\path\to\hellofx\mods\hellofx\module-info.class
C:\path\to\hellofx\mods\hellofx\hellofx\HelloFX.class
The third step will just remove the sources.txt file.
And now you can run your module:
java --module-path "%PATH_TO_FX%;mods" -m hellofx/hellofx.HelloFX
You can specify any directory for the output, of course, so you can change it to out or build for instance, but then make sure you modify it accordingly in the rest of the instructions.
I am using the build 9-ea+129-jigsaw-nightly-h5332-20160730
I have a very simple module with a Main class and a module-info.java
I compile the module using javac --module-source-path and everything is ok. The class files are being generated for both module-info.class and Main.class
javac -d modules --module-source-path src $(find . -name "*.java")
When I try to create the modular JAR file with the jar tool, I get the following error message:
module-info.class found in a versioned directory without module-info.class in the root
My module-info.class is there in the root directory.
I run:
$ jar --create --file mlib/ModuleFirst#1.0.jar --module-version 1.0 --main-class com.firstmodule.Main -c modules/com.firstmodule
Can you tell me why do I get this error and what I did wrong?
Thank you
Regards
I have the same problem
You should change a lot your command
$ jar --create --file mlib/ModuleFirst#1.0.jar --module-version 1.0 --main-class com.firstmodule.Main -C modules/com.firstmodule .
You must use the capital C and put the dot at the end of line
I am trying to compile a simple Hello World from windchill shell using command javac com.A.B.Test.
But it is displaying could not find main class error.
I think your problem is Java and not Windchill related.
Let's say your Java source file is stored in the following location:
/src/com/A/B/Test.java
To compile that file in shell (Linux for example):
cd /src
javac com/A/B/Test.java
To run that file (if it contains a main method):
java -cp /src com.A.B.Test
Try using the below command from the windchill Shell.
Hope you are following the default file structure provided by the Vendor i'm providing the same below otherwise just edit the path mentioned in the below command.
javac -d codebase -cp %CLASSPATH%;%WT_HOME%\srclib\tool\Annotations.jar src*.java
First Go to Windchill Shell then navigate to the folder where java file is present. At that location type javac Test.java and press enter.
Put the code into WT_HOME/src/com/package, than run from WT_HOME:
ant -f bin/tools.xml class -Dclass.includes=com/..path-to-package/*
tomcat
-webapps
-Servlet
-WEB-INF
-lib
-classes
-cc
-openhome
-HelloServlet.java
in cmd ,
C:\tomcat\webapps\Servlet>javac -classpath .;c:\tomcat\lib\servlet-api.jar -d ..\classes\cc\openhome\HelloServlet.java
but message says directory not found
and I compile the HelloServlet.java , it shows package javax.servlet does not exist
I tried each method found from here, is anyone know what it happens? thank you
-d is the switch for changing output directory and not for defining a java source file and it expects a directory, not a file.
Also that class folder is usually for the compiled classes and not for the sources.
Try this:
javac -classpath .;c:\tomcat\lib\servlet-api.jar -d .\WEB-INF\classes .\WEB-INF\classes\cc\openhome\HelloServlet.java
I want to create one executable JAR file which contains other JAR libraries. But when I execute the JAR, it gives an error of class path problem.
How do I solve the class-path problem?
I think you can try it like this;
Here is a simple example for you question. First, we assume we have a project directory like D:\javademo. In this working directory we then create a main class HelloWorld.java and thtat contains our other JAR files, like commons-lang.jar. Now, we must archive our main classes HelloWorld and commons-lang.jar into test.jar file.
First we must edit our manifest file so that we can specify our class-path and main-class
like this:
Manifest-Version: 1.0
Created-By: tony example
Class-Path: test.jar commons-lang.jar
Main-Class: org.tony.java.HelloWorld
We named this file test.mf. Now we use the jar command to generate our JAR file like this:
jar -cvfm test.jar test.mf -C ./ .
Then it will generate the JAR file test.jar. You can use this command to run this main class using java command:
java -jar test.jar
That is my solution. I hope it give you something helpful...
You should use third-party libraries for it. For example, OneJar. You'll have to build the final JAR file using the OneJar tool (like Ant task) instead of standard JRE's tools.
On running such a JAR file, OneJar's service class is launched instead of yours. This class then loads JAR files packed inside, as well as your classes, and run your main class.
There are similar questions and answers already. For example: Stack Overflow question Easiest way to merge a release into one JAR file.