FAQ: How To Set Classpath For Java?

What is CLASSPATH in Java with example?

Classpath is a parameter in the Java Virtual Machine or the Java compiler that specifies the location of user-defined classes and packages. The parameter may be set either on the command-line, or through an environment variable.

How do I find my Java CLASSPATH?

To check our CLASSPATH on Windows we can open a command prompt and type echo %CLASSPATH%. To check it on a Mac you need to open a terminal and type echo $CLASSPATH.

How do I permanently set my CLASSPATH?

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 set the CLASSPATH in eclipse?

Set the classpath variables:

  1. In Eclipse, go to Window > Preferences > Java > Build Path > Classpath Variables.
  2. Click New, enter the following information and click OK. Name J2EE_JAR. Path.
  3. Click New, enter the following information and click OK. Name JAVAMAIL_HOME.
  4. Click OK to save the preferences.
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Is CLASSPATH necessary?

You need to set the CLASSPATH if: You need to load a class that is not present in the current directory or any sub-directories. You need to load a class that is not in a location specified by the extensions mechanism.

How do I find the classpath?

package com.javacodegeeks.snippets.core;

  1. public class getClassPath {
  2. public static void main(String[] args) {
  3. // Get class path by using getProperty static method of System class.
  4. String strClassPath = System.getProperty( “java.class.path” );
  5. System.out.println( “Classpath is ” + strClassPath);
  6. } }

What is the default classpath for Java?

From The Java™ tutorials: PATH and CLASSPATH: The default value of the class path is “.”, meaning that only the current directory is searched. Specifying either the CLASSPATH variable or the -cp command line switch overrides this value.

What is Java command line?

The java command-line argument is an argument i.e. passed at the time of running the java program. The arguments passed from the console can be received in the java program and it can be used as an input. So, it provides a convenient way to check the behavior of the program for the different values.

How do I change 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 I find my classpath in Windows?


  1. Select Start, select Control Panel. double click System, and select the Advanced tab.
  2. Click Environment Variables.
  3. In the Edit System Variable (or New System Variable) window, specify the value of the PATH environment variable.
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How do I permanently set classpath in Linux?

The first way of setting your $PATH permanently is to modify the $PATH variable in your Bash profile file, located at /home/<user>/. bash_profile. A good way to edit the file is to use nano, vi, vim or emacs. You can use the command sudo <editor> ~/.

How do you solve NoClassDefFoundError?

NoClassDefFoundError, which means the Class Loader file responsible for dynamically loading classes can not find the. class file. So to remove this error, you should set your classpath to the location where your Class Loader is present.

Which is referenced by classpath does not exist?

jar which is referenced by the classpath, does not exist. This error comes if when the jar file is dislocated from the path you added to the class path. Remove the jar from there and add from the new location. If the classpath could find the jar from the location.

What is classpath of a project?

classpath maintains the project’s source and target references for Java compilation and compressed file or project dependencies. This configuration is maintained through the Java Build Path page in the project’s properties. Optionally, Access Rules and JavaDoc references can be configured on JAR files.

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