javac error Class names are only accepted if annotation processing is explicitly requested

Question

I get this error when I compile my java program    error  Class names   EnumDevices   are only accepted if annotation  processing is explicitly requested 1 error   Here is the java code  I m running this on Ubuntu    import jcuda CUDA      import jcuda driver CUdevprop      import jcuda driver types CUdevice   public class EnumDevices      public static void main String args           CUDA cuda   new CUDA true               int count   cuda getDeviceCount             System out println  Total number of devices      count            for  int i   0  i  lt  count  i                 CUdevice dev   cuda getDevice i             String name   cuda getDeviceName dev             System out println  Name      name             int version     cuda getDeviceComputeCapability dev              System out println  Version                     String format   d  d   version 0   version 1               CUdevprop prop   cuda getDeviceProperties dev             System out println  Clock rate      prop clockRate     MHz              System out println  Threads per block      prop maxThreadsPerBlock                       Here is the javac command   javac -cp  home manish yadav Desktop JCuda-All-0 3 2-bin-linux-x86 64 EnumDevices   How do I compile this program

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chandan cmaster   More  javac New java chandan cmaster   More  javac New error  Class names   New   are only accepted if annotation processing is explicitly requested 1 error   So if you by mistake after compiling again use javac for running a program

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To avoid this error  you should use javac command with  java extension   Javac DescendingOrder java  lt - this work perfectly

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The error  Class names are only accepted if annotation processing is explicitly requested  can be caused by one or more of the following    Not using the  java extension for your java file when compiling  Improper capitalization of the  java extension  i e   Java  when compiling  Any other typo in the  java extension when compiling  When compiling and running at the same time  forgetting to use   amp  amp   to concatenate the two commands  i e  javac Hangman java java Hangman    It took me like 30 minutes to figure this out  which I noticed by running the compilation and the running the program separately  which of course worked perfectly fine      This may not be the complete list of causes to this error  but these are the causes that I am aware of so far

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You at least need to add the  java extension to the file name in this line   javac -cp  home manish yadav Desktop JCuda-All-0 3 2-bin-linux-x86 64 EnumDevices   From the official faq      Class names   HelloWorldApp   are only accepted if annotation processing is explicitly requested      If you receive this error  you forgot to include the  java suffix when compiling the program  Remember  the command is javac HelloWorldApp java not javac HelloWorldApp     Also  in your second javac-example   in which you actually included  java  you need to include the all required  jar-files needed for compilation

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Perhaps you may be compiling with file name instead of method name    Check once I too made the same mistake but I corrected it quickly       happy Coding

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i think this is also because of incorrect compilation    so for linux  ubuntu        javac file java  java file

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first download jdk from https   www oracle com technetwork java javase downloads index html  Then in search write Edit the System environment variables In open window i push bottom called Environment Variables Then in System variables enter image description here Push bottom new  In field new variables write  Path  In field new value Write directory in folder bin in jdk like  C  Program Files Java jdk1 8 0 191 bin  but in my OS work only this  C  Program Files Java jdk1 8 0 191 bin javac exe  enter image description here press ok 3 times   Start Cmd   I push bottom windows   R  Then write cmd  In cmd write  cd  your directory with code    looks like C  Users user IdeaProjects app src  Then write  javac  name of your main class for your program  java  looks like blabla java and javac create byte code like  name of your main class  class in your directory  last write in cmd  java  name of your main class   and my program start work

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How you can reproduce this cryptic error on the Ubuntu terminal   Put this in a file called Main java   public Main      public static void main String   args           System out println  ok              Then compile it like this   user defiant  home user   javac Main error  Class names   Main   are only accepted if  annotation processing is explicitly requested 1 error   It s because you didn t specify  java at the end of Main     Do it like this  and it works   user defiant  home user   javac Main java user defiant  home user     Slap your forehead now and grumble that the error message is so cryptic

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I created a jar file from a Maven project  by write mvn package  or mvn install   after that i open the cmd   move to the jar direction and then to run this code the java -cp FILENAME jar package Java-Main-File-Name-Class  Edited   after puting in Pom file declar the main to run the code   java -jar FILENAME JAR

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I learned that you also can get this error by storing the source file in a folder named Java

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I was stumped by this too because I was including the  Java extension     then I noticed the capital J   This will also cause the  annotation processing  error   javac myclass Java    Instead  it should be   javac myclass java

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Using javac ClassName java to compile the program  then use java ClassName to execute the compiled code  You can t mix javac with the ClassName only  without the java extension

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If you compile multiple files in the same line  ensure that you use javac only once and not for every class file   Incorrect     Correct

[java] javac error: Class names are only accepted if annotation processing is explicitly requested

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