Could not find or load main class

Question

I have Windows 7  installed jdk1 7 0 and its supporting jre7  My problem is compilation part works perfectly  but while running the Java program I get this error saying       Could not find or load main class    I am storing all my programs in javalab folder  I have set the path to it  Procedure looks like this    C  Users user cd   C   cd javalab  C  javalab autoexec bat  C  javalab set path C  Program Files Java jdk1 7 0 bin  C  javalab javac p1 java  C  javalab java p1 Error  Could not find or load main class p1  C  javalab

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Simple way to compile and execute java file  HelloWorld java doesn t includes any package    set path  C  Program Files  x86  Java jdk1 7 0 45 bin  javac  HelloWorld java  java -cp   HelloWorld pause

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I faced a similar problem in Eclipse  Whenever I clicked on the Run button it gave me the message   Error  Could not find or load main class   But when I right click on the java file in the project explorer and Run As Java configuration  it works perfectly    I think this is because it tries by default to run it in some other configuration which causes problems   Hope this answer helps some

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Check you class name first  It should be p1 as per your batch file instruction  And then check you package of that class  if it is inside any package  specify when you run   If package is x y  java x y p1

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I ve had similar problems  If you work with Eclipse  you need to go to the folder where you have your src  folder    If you used a package - then you use  javac -cp   packageName className   which means if you ve had a package named def and main class with name TextFrame java you d write  javac -cp   def TextFrame   omitting the trailing  java extension  and then you run it with the  java def TextFrame    and if you have have arguments  then you need to supply it with arguments corresponding to your program  I hope this helps a bit

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First  put your file   class  e g Hello class  into 1 folder  e g C  java   Then you try command and type cd  d C  java  Now you can type  java Hello

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Sometimes what might be causing the issue has nothing to do with the main class  I had to find this out the hard way  it was a referenced library that I moved and it gave me the      Could not find or load main class xxx Linux   I just delete that reference and added again and it worked fine again

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Try   java -cp   p1   This worked for me when I had the same problem  using Fedora  linux

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I had almost the same problem  but with the following variation     I ve imported a ready-to-use maven project into Eclipse IDE from PC1  project was working there perfectly  to another PC2 when was trying to run the project on PC 2 got the same error  Could not find or load main class  I ve checked PATH variable  it had many values in my case  and added JAVA HOME variable  in my case it was JAVA HOME   C  Program Files Java jdk1 7 0 03  After restarting Ecplise it still didn t work I ve tried to run simple HelloWorld java on PC2  in another project  - it worked  So I ve added HelloWorld class to the imported recently project  executed it there and - huh - my main class in that project started to run normally also    That s quite odd behavour  I cannot completely understand it  Hope It ll help somebody  too

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i guess that you have a different class name in p1 java

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I was having a similar issue with my very first java program   I was issuing this command   java HelloWorld class   Which resulted in the same error   Turns out you need to exclude the  class  java HelloWorld

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javac should know where to search for classes  Try this   javac -cp   p1 java   You shouldn t need to specify classpath  Are you sure the file p1 java exists

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You can use NetBeans IDE which is free to download and use  Open Source   You can even do other programming language in this IDE  The latest of which it supports HTML5  This makes your programming easier  If you re not familiar with it choose a book that is NetBeans integrated like Sams Teach Yourself Java in 24 Hours

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If you have a single  java file to compile using command-line   then remove  topmost package parts from the code  the compile again  it will work   This worked for me

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i had             in my project name e g  HKUSTx part-2  renaming it  HKUSTx-part-2  worked for me

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You might have the CLASSPATH environment variable already added    Use following to avoid further usage of -cp   in java -cp   CLASSFILE  Add   to CLASSPATH in system properties- environment variables or by cmd  set CLASSPATH  CLASSPATH

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Here is my working env path variables after much troubleshooting  CLASSPATH    C  Program Files  x86  Java jre7 lib ext QTJava zip C  Program Files  x86  Java jdk1 6 0 27 bin  PATH   lt ---sometimes this PATH fills up with too many paths and you can t add a path which was my case    bunchofpaths C  Program Files  x86  Java jdk1 6 0 27 bin  Additionally  when you try to use the cmd to execute the file   make sure your in the local directory as the file your trying to execute  which you did    Just a little checklist for people that have this problem still

[java] Could not find or load main class

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