Java Classpath Setting


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How to Set Path and Classpath in Java

Path Variable

Path variable is set for providing path for all java tools like java, javac, javap, javah, jar, appletviewer which are use in java programming. These all tools are available in bin folders so we set path upto bin folders.

Classpath Variable

Classpath variable is set for providing path for predefined java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar.

Video Tutorial

How to Set Path and ClassPath in Java

JDK Folder Hierarchy

JDK folder

Why set path ?

The following programming error is general for all java programmers when they compile any java program.

'javac' is not recognized as an internal or external command, operable program or batch file.

When you get this type of error, then your operating system cannot find the java compiler (javac). To solve this error you need to set the PATH variable.

Javac is a tool which is available in bin folder so you must set the PATH upto bin folder. In a bin folder all tools are available like javap, javah, jar, javac, java, appletviewer etc. These all tools are used for different-different purpose.

bin folder

set the path and classpath

Go on my computer icon and right click, after that click on properties option.

My computer properties

Now click on advance setting

Advance settings

Click on advance

advance

Click on Advance variables

Environment variable

Click on new button which is below the first box.

Environment variable

Now one dilog box is appear, now ignore this but do not close.

Path and classpath

Now open my computer open c:/ > Programs Files > java > java1.6.0 > bin copy this path

Path and classpath

Now come back on previous open dilogbox and write variable name 'path' and for variable value paste all copied path upto bin folder. Put .; at the end. It (.) select all the tools from bin folder.

Path and classpath

Now open my computer open c:/ > Programs Files > java > java1.6.0 > jre > lib > rt.jar copy this path

Note: rt.jar is available in lib folder this jar files contains all classes of jdk.

Path and classpath

Now again come back on Environment variable dilogbox and click on new. now one box is open and write path variable as 'classpath' and for variable value paste all copied path upto rt.jar. Put .; at the end. It (.) select all the classes from lib folder.

Path and classpath Path and classpath

Note: Finally after set classpath Restart your system, or you can re-open command prompt.


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