I want to run Junit from commandline in Mac OS but Im not able to get it to work as expected with a simple test class that I have created.
I have downloaded junit-4.12.jar for this purpose and been writing a very simple test class with one simple test method.
Im running with the following command to compile the class:
javac -cp .:/Full/path/to/junit/junit-4.12.jar DemoTest.java
..and running the following command to execute the compiled class:
java -cp .:/Full/path/to/junit/junit-4.12.jar org.junit.runner.JUnitCore DemoTest
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class DemoTest {
#Test
public void evaluate(){
assertEquals(true, 1<2);
}
}
I'm expecting to see "test pass" when I am running the junit class from commandline, because that's what it should generate. Instead Im getting the following error message (please note that Im only pasting the first line of error for the sake of simplicity):
Exception in thread "main" java.lang.NoClassDefFoundError: org/hamcrest/SelfDescribing
Does this mean that Im only missing the hamcrest.jar file to be able to run the application as expected?
Please let me know if you need the complete error stacktrace!
As the error message
Exception in thread "main" java.lang.NoClassDefFoundError:
org/hamcrest/SelfDescribing
mentioned you miss the hamcrest-core library in your class path. Download it and add it to the classpath
java -cp .:/Full/path/to/junit/junit-4.12.jar:/Full/path/to/hamcrest/hamcrest-core-1.3.jar org.junit.runner.JUnitCore DemoTest
I have a problem while trying executing my java application.
Whenever I try to execute the program through the command
java ProgAudioJ
I get this error:
Exception in thread "main"
java.lang.NoClassDefFoundError: ProgAudioJ (wrong name: es_2011/ProgAudioJ)
at java.lang.ClassLoader.defineClass1(NativeMethod)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
at java.security.AccessController.doPrivileged(NativeMethod)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: ProgAudioJ. Program will exit.
If I remove from my code:
package es_2011;
Everything works perfectly. How do I solve the problem?
Because I found these answers unclear, here is what you need to do.
First, if you package your code (IE your classes have the package keyword at the top) the compiled classes have to be in a directory with the same name as your package declaration in code. After you have compiled your classes, you need to move up a directory when you exectute the java command, and you include the name of the package. For example, if your code exists in /myFolder/myPackage/ , and your class starts with package myPackage (note that the directory and the package are the same name), then you would do the following (linux / osx):
cd /myFolder/myPackage
javac MyClass.java
cd ..
java myPackage.MyClass
Edit - A late edit to clarify something I see people get confused on. In the example above, the package is only one deep, meaning its just myPackage. If you code has a larger package, like
package com.somedomain.someproject;
you will need to execute the java command from the directory which contains the root directory for that package. For example if your compiled code is in myCode/com/somedomain/someproject/MyMainClass.class, then you will execute the java command from the myCode folder, like this (Again, take special note that the directory structure is the same as the package declaration):
cd /myCode
java com.somedomain.someproject.MyMainClass
Try using:
java es_2011.ProgAudioJ
(instead of java ProgAudioJ).
I'm making some assumptions here about your current working directory and your CLASSPATH. If you can provide information about the command you're running (e.g. what directory you're in, where the class file is located, etc.), we can help you more efficiently.
Try this (compile and run):
dir
2011-02-10 00:30 <DIR> .
2011-02-10 00:30 <DIR> ..
2011-02-10 00:27 58 es_2011
javac es_2011/ProgAudioJ
java es_2011.ProgAudioJ
It's quite clearly stated there:
java.lang.NoClassDefFoundError: ProgAudioJ (wrong name: es_2011/ProgAudioJ)
If you want to put a class in a package(*), then the source code must be placed in a corresponding directory, e.g.,
src/Main.java <- root package (no declaration)
src/es_2011/ProgAudioJ.java <- package es_2011;
(*) You should do it always, except for tiny throw-away stuff and possibly for the main class.
Try this,
Compile your class using below command
$ javac ProgAudioJ.java -d .
Run your application by command
$ java es_2011.ProgAudioJ
The reason that it works when you remove
package es_2011
is that you are changing how the compiler packages up, and effectively locates, the file.
I had the same problem - and the error message wrong name: does indeed point you to the answer. You are using the wrong name "ProgAudioJ" in order to run the .class file.
It has been packaged up as
es_2011/ProgAudioJ
In order to run it - you have to either move up a directory:
If you are here: (Windows)
src\es_2011\
move to
src\
Then run the line:
java es_2011.ProgAudioJ
This tells the compiler to look for the ProgAudioJ - which resides in the es_2011 package. For a standard installation, this will be based on folders - so it will look for the es_2011 folder first, and then the name of the .class file that you want to run (ProgAudio).
I am getting this exception error at
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/commons/math3/random/RandomDataImpl
at this line of code:
randomData_ = new RandomDataImpl();
and this is how the class is imported in the code :
import org.apache.commons.math3.random.RandomDataImpl;
i have added all of the math common classes to the classpath while running the code. any ideas whats going on ?
It looks like you did not set the appropriate classpath.
You can set it as follows:
java -classpath lib/*.jar:. mypackage.MyClass
Try that and I am sure it will work.
If you are using maven, then read this article
You can also check your current classpath with:
System.getProperty("java.class.path")
Just write simple app printing this property out and run it just as you run an app with which you are having problems.
I managed to successfully compile my code, but I'm not able to execute it. How do I fix this?
scannerTesting is my package and ScannerTesting.java is my main file.
D:\Java>javac Testing\src\scannerTesting\ScannerTesting.java
D:\Java>java Testing\src\scannerTesting\ScannerTesting
Exception in thread "main" java.lang.NoClassDefFoundError: Testing\src\scannerTesting\ScannerTesting <wrong name: scannerTesting/ScannerTesting>
.
.
.
java -cp ./Testing/src scannerTesting.ScannerTesting
When you run java, it looks for matching classes within its classpath. So what these arguments are doing is add your source folder to the classpath using -cp, and specify that the class that should be run is scannerTesting.ScannerTesting.
For more information, check out java cli tool documentation at Oracle
scannerTesting is your package name,right?
If so, I suggest you run command "java" under the workspace D:\Java\Testing\src
java scannerTesting.ScannerTest
When I fire the following from command line:
D:\workspace 2\project\lib>java -javaagent:myagent.jar -cp asm-all-3.3.jar;. AgentMain
I get the following error
java.lang.NullPointerException
java.lang.NullPointerException
Exception in thread "main" java.lang.NoSuchMethodError: java.lang.VerifyError: method(init) (Ljava/lang/String;) V not found
java.lang.NullPointerException
Couldnot find the main class AgentMain. Program will exit.
I have all the files and jar in the working directory. AgentMain is the compiled class that I put it here from the bin folder. I dont know what is the problem.
I would check first whether the Agent is implemented OK?
You did follow the structure as set forth in java.lang.instrument (public static void premain(String agentArgs);) including the MANIFEST entries? And there's no way that the Agent can throw NPEs during initialization?
Also, you may want to try out wheter it's the Agent or the AgentMain.class, by running java -javaagent:myagent.jar -cp asm-all-3.3.jar;. -version
Have you tried setting the classpath to the current folder (-cp . ) ?