java execute jar file code example
Example 1: run jar file command line
java -jar <jar-file-name>.jar
Example 2: java execute jar from main
java -cp MyJar.jar com.packagename.MainClass [somearg1] [somearg2] [etc]
Example 3: java load jar at runtime
URLClassLoader child = new URLClassLoader(
new URL[] {myJar.toURI().toURL()},
this.getClass().getClassLoader()
);
Class classToLoad = Class.forName("com.MyClass", true, child);
Method method = classToLoad.getDeclaredMethod("myMethod");
Object instance = classToLoad.newInstance();
Object result = method.invoke(instance);
Example 4: run jar file with different jre
First, go to the location of the java installation file. By default, this is:
C:\Program Files\Java\...
Open the folder of the java version you want and go to the bin folder.
Copy the directory your at then go to your command line.
Syntax: (%PATH% is path you copied):
"%PATH%/java.exe" [javaArgs] [filePath] [yourCodeArgs]