How do I add multiple JAR files to classpath in Linux?

How do I add multiple JAR files to classpath in Linux?

5 ways to add multiple JARs in Classpath

  1. Include the JAR name in the CLASSPATH environment variable.
  2. Include the name of the JAR file in -classpath command-line option.
  3. Include the jar name in the Class-Path option in the manifest.
  4. Use Java 6 wildcard option to include multiple JAR.

Can JAR file have multiple main classes?

Jar files can contain only one Main-Class attribute in the manifest, which means a jar can contain only one mainClassName.

How do I find a class file in a bunch of JARs?

Grepj is a command line utility to search for classes within jar files….findstr.exe comes standard with Windows and the params:

  1. /s = recursively.
  2. /m = print only the filename if there is a match.
  3. /c = literal string (in this case your package name + class names separated by ‘/’)

How do I add a jar to a classpath in Unix?

There are several ways to add a JAR to the classpath:

  1. Copy the JAR to one of the directories listed in the CLASSPATH environment variable.
  2. Modify the CLASSPATH environment variable to also include the directory containing the JAR archive.
  3. Set the classpath at runtime.

How do I create a JAR file with multiple classes?

You can also do it using Command Line. Transfer all the classes into a folder. Say it is in the folder with absolute path C:\Java\Project1. Here c will create jar, f will transfer the content into the file provided i.e. Project1….

  1. no.
  2. Just extract the files from the jars (e.g. jar xf jar-file ) then repackage them.
  3. ok.

Can I have multiple main methods in single class?

The answer to the question would be Yes. We can overload the main method. We can create many methods with the same name main. However, as mentioned earlier, only the public static void main(String[] args) method is used for the program execution.

How do I list the contents of a JAR file?

Viewing the Contents of a JAR File

  1. The t option indicates that you want to view the table of contents of the JAR file.
  2. The f option indicates that the JAR file whose contents are to be viewed is specified on the command line.
  3. The jar-file argument is the path and name of the JAR file whose contents you want to view.

How do I add something to my classpath?


  1. Select Start.
  2. Go to the Control Panel.
  3. Select System and Security.
  4. Select Advanced System settings.
  5. Click on Environment Variables.
  6. Click on New under System Variables.
  7. Add CLASSPATH as variable name and path of files as a variable value.
  8. Select OK.

How do you set classpath variables in UNIX?

To set the CLASSPATH permanently, set an environment variable:

  1. On the Windows Control Panel, click System.
  2. Click Advanced or Advanced Systems Settings.
  3. Click Environment Variables.
  4. Under User variables, click New.
  5. In the Variable name box, type CLASSPATH .
  6. In the Variable value box, type the path to the Vertica JDBC .

How do I compile multiple Java files in a package?

2. Compile multiple Java source files

  1. Compile three source files at once, type: javac
  2. Compile all source files whose filenames start with Swing: javac Swing*.java.
  3. Compile all source files:

Can I have multiple main methods?

From the above program, we can say that Java can have multiple main methods but with the concept of overloading. There should be only one main method with parameter as string[ ] arg.

How to add multiple jar files to Classpath while compiling?

Say you have multiple jar files a.jar,b.jar and c.jar. To add them to classpath while compiling you need to do Show activity on this post. You use the -classpath argument. You can use either a relative or absolute path.

How to add jars to Classpath in spark?

2.1 Adding jars to the classpath You can also add jars using Spark submit option –jar, using this option you can add a single jar or multiple jars by comma-separated. spark-submit –master yarn –class com.sparkbyexamples.WordCountExample –jars /path/first.jar,/path/second.jar,/path/third.jar your-application.jar

What is $Classpath used for in Java?

$CLASSPATH is specifically what Java uses to look through multiple directories to find all the different classes it needs for your script (unless you explicitly tell it otherwise with the -cp override).

How to avoid setting the Classpath every time I run an application?

In order to avoid setting the classpath everytime you want to run an application you can define an environment variable called CLASSPATH.