This should be simple but I have never done it before and didn't find any solution.
I am currently using Eclipse to code my program, which imports some external JAR library such as google data api library. I can use Eclipse to compile/build/run the program.
But now I want to run it in terminal, so where should I put those JAR files, and how to build and run the program?
Thanks!
You can do :
1) javac -cp /path/to/jar/file Myprogram.java
2) java -cp .:/path/to/jar/file Myprogram
So, lets suppose your current working directory in terminal is src/Report/
javac -cp src/external/myfile.jar Reporter.java
java -cp .:src/external/myfile.jar Reporter
Take a look here to setup Classpath
src/external/ and the source file is in src/Report/Reporter.java, can you give the specific commands?
/usr/bin/java -cp /home/username/folderx/j.jar:/home/username/folderx MyClass
For compiling the java file having dependency on a jar
javac -cp path_of_the_jar/jarName.jar className.java
For executing the class file
java -cp .;path_of_the_jar/jarName.jar className
Javac Reporter.java
java Reporter
Similarily, you can set it in windows environment variables. for example, in Win7
Right click Start-->Computer then Properties-->Advanced System Setting --> Advanced -->Environment Variables in the user variables, click classPath, and Edit and add the full path of jars at the end. voila
Suppose your jar application "myapp.jar" has the following code snippet written inside it.
import org.json.JSONObject;
public class Main {
public static void main(String[] args) {
// write your code here
System.out.println("Hello World!");
JSONObject jo = new JSONObject("{ \"abc\" : \"def\" }");
System.out.println(jo.toString());
}
}
It is using the external library json.jar from which we imported "org.json.JSONObject". Running the following command will result in an error.
java -jar myapp.jar
Exception message:
Exception in thread "main" java.lang.NoClassDefFoundError: org/json/JSONObject at com.reve.Main.main(Main.java:10) Caused by: java.lang.ClassNotFoundException: org.json.JSONObject at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source) at java.base/java.lang.ClassLoader.loadClass(Unknown Source) ... 1 more
We must include the json.jar file while running the jar file. We have to specify the class path of the file before building our myapp.jar file.
Inside META-INF/MANIFEST.MF file:
Manifest-Version: 1.0
Class-Path: lib/json.jar lib/example2.jar
Main-Class: com.reve.Main
Specify the external libraries separated by spaces under the Class-Path keyword. Then after building the project and the artifact, we can run the jar file by simply writing the same command we discussed above.
First, you should put your source code .java files in src/.
Second, you make build/ folder in your root project
Third, you make a jars/ folder in your root project
So, now you will have src/ and build/ and /jars under your root project
To compile
javac -d ./build -cp ./jars/itextpdf-5.5.13.3.jar:jars/pdfbox-app-2.0.27.jar src/*.java
To run:
java -cp ./build:./jars/itextpdf-5.5.13.3.jar:jars/pdfbox-app-2.0.27.jar Main
