Running Java Program from Command Line Linux

Question

I am not very experience with java and this is driving me crazy  I wrote a java program FileManagement and I need to run it from the command line   I can compile it from the command line with javac FileManagement   java which will create all the classes in that folder but when I try java FileManagement Main it says       Exception in thread  main  java lang NoClassDefFoundError    FileManagement Main   The thing is that I have tried this same procedure in a remote computer and it is working fine  It is not working on mine

User · Accepted Answer

If your Main class is in a package called FileManagement  then try   java -cp   FileManagement Main   in the parent folder of the FileManagement folder    If your Main class is not in a package  the default package  then cd to the FileManagement folder and try   java -cp   Main   More info about the CLASSPATH and how the JRE find classes    How Classes are Found Setting the class path  Solaris Linux  http   en wikipedia org wiki Classpath  Java

User · Answer

This is the KISS answer    Let s say you have several  java files in the current directory     ls -1   java javaFileName1 java javaFileName2 java   Let s say each of them have a main   method  so they are programs  not libs   then to compile them do   javac   java -d     This will generate as many subfolders as  packages  the  java files are associated to  In my case all java files where inside under the same package name packageName  so only one folder was generated with that name  so to execute each of them   java -cp   packageName javaFileName1 java -cp   packageName javaFileName2

User · Answer

What is the package name of your class  If there is no package name  then most likely the solution is   java -cp FileManagement Main

User · Answer

Guys let s understand the syntax of it    If class file is present in the Current Dir   java -cp   fileName If class file is present within the Dir  Go to the Parent Dir and enter below cmd   java -cp   dir1 dir2 dir3 fileName If there is a dependency on external jars then   java -cp     jarName1   jarName2 fileName  Hope this helps

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