I am trying to run a simple junit test using OS X and terminal. I have placed the Junit jar file inside my java folder. I was able to compile all of the files using:
javac -cp .:"/Library/java/junit.jar" *.java
It compiles just fine, with no errors. However when I try to run the command:
java TestRunner
It gives the error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/junit/runner/JUnitCore
at TestRunner.main(TestRunner.java:7)
Caused by: java.lang.ClassNotFoundException: org.junit.runner.JUnitCore
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
I cannot seem to find what I am doing incorrectly. Any help solving this would be greatly appreciated.
Like #ToddSewell said, the external libraries should be in your classpath for the execution too. Try this:
java -cp .:"/Library/java/junit.jar" TestRunner
Related
I have one app which I want to dockerize. But first, I need to run it via console(cmd or bash). When I run it from Eclipse everything is okay, but when I run it from bash(java -jar project-18.5.0-SNAPSHOT.jar) I get this error
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at com.hp.spacecat.util.PropertyUtil.<clinit>(PropertyUtil.java:35)
at com.hp.spacecat.SpaceCat.main(SpaceCat.java:76)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more
I have that jar in m2 and he has this LogFactory class. Mvn clean install is success. But for some reason I can't run it via console. I don't know is there some way to get that classpath from Eclipse or there is another way to solve this.
Similar questions about this logging exception didn't help me.
I am not particularly well experienced with Java at all and try to get a jar file running on my Ubuntu machine (https://sites.google.com/site/communitydetectionslpa/home).
However once I run the jar file with the command suggested by developers I receive the following error:
java -jar GANXiSw.jar -i test.ipairs
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/collections/map/MultiKeyMap
at Net.<init>(Net.java:38)
at SLPAw.<init>(SLPAw.java:146)
at SLPAw.main(SLPAw.java:2050)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.map.MultiKeyMap
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 3 more
Apparently java is not able to import the org.apache.commons class properly. After some researching I checked if I have libcommons-collections3-java installed, which however is the case.
I read something about adding the library explicitly to my CLASSPATH, which however I also read to be not good practice.
What is the best approach to fix my issue?
i'm trying to learn something about JFlex and Cup tools on Ubuntu, because i have to use them for a school project. So i downloaded and installed JFlex and Cup. There are some examples in "jflex-1.6.1/examples", so i tried to run one of them. In particularly i tried to run the one in "jflex-1.6.1/examples/cup", following the instructions in the README file:
To compile:
jflex lcalc.flex
java java_cup.Main < ycalc.cup
javac Main.java
To run:
java Main test.txt
Files:
"Main.java" demo of a main program
"Makefile " makefile to compile and test the example
"README"
"lcalc.flex" the lexer spec
"output.good " how the output should look like for the test
"ycalc.cup" the parser spec
"test.txt " sample input for testing
With many difficulties, i have been finally able to compile, then to complete successfully the first three instructions. Now i have errors when i try to run: java Main test.txt. In particular i get this error:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: java_cup/runtime/Scanner
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: java_cup.runtime.Scanner
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
I don't have any idea on how to solve this. I tried also with other examples but the results were the same.
I hope that you can help me. Thank you!
I also got this error, and it's because I forgot to include java-cup.jar and java-cup-runtime.jar in my class path.
Try compiling like this:
javac -cp path/to/java-cup.jar Main.java
And then run your program like this:
java -cp path/to/java-cup-runtime.jar Main
I'm trying to compile a java-program written with OpenCV 3.2.0 from the terminal. It was originally written in Eclipse with OpenCV as a user library.
I compile it with this command:
javac -cp /opencv-3.2.0-java/build/bin/ *.java
It works with no error, the -cp command shows the path to the OpenCV jar. I then try to run everything with this command:
java -Djava.library.path="/opencv-3.2.0-java/build/lib" -cp jar/opencv-320.jar -classpath . Main
It gives me this error:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/opencv/core/Mat
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: org.opencv.core.Mat
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
I searched for solutions to this problem and came to the conclusion that it had something to do with native libraries. I use the -Djava parameter to link to the path of the library files from OpenCV, but it still doesn't work somehow. How do I fix this?
EDIT:
All the .java files are on a folder on the desktop. This is were the Main file is included. For example:
home/pi/Desktop/MultiSensor_v2.0_Java/Main.java
The path to the OpenCV jar:
/home/pi/Desktop/MultiSensor_v2.0_Java/opencv-3.2.0-java/build/bin/opencv-320.jar
The path to OpenCV native libraries:
/home/pi/Desktop/MultiSensor_v2.0_Java/opencv-3.2.0-java/build/lib
-cp is short for -classpath. So I suspect that when you use both, the second one overwrites the first.
You can have multiple entries on the class path separated by : as stated in the documentation: Setting the class path. (actually, it looks like that is a typo in the doc, and it should be ; as a separator. You could try both)
If you execute your command from the directory home/pi/Desktop/MultiSensor_v2.0_Java/ that would make:
java -Djava.library.path="opencv-3.2.0-java/build/lib" -cp .:opencv-3.2.0-java/build/bin/opencv-320.jarr Main
I have a simple jsoup test app in a single folder, in which there are 2 classes - LyricsGetter.java and Main.java - and a .jar file with jsoup library. When I compile the files with command javac -cp jsoup-1.8.2.jar LyricsGetter.java Main.java everything compiles ok, but when I try to run with java Main, I get:
Exception in thread "main" java.lang.NoClassDefFoundError: org/jsoup/Jsoup
at LyricsGetter.getLyrics(LyricsGetter.java:16)
at Main.main(Main.java:14)
Caused by: java.lang.ClassNotFoundException: org.jsoup.Jsoup
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more
On the other hand if I run with java -cp jsoup-1.8.2.jar Main, then I get Error: Could not find or load main class Main. So, what is the correct way to run this program?
You need to tell Java to look for classes in jsoup-1.8.2.jar, and the current folder (.).
On Windows, use:
java -cp jsoup-1.8.2.jar;. Main
or on Linux, OSX, or other Unix-like systems use:
java -cp jsoup-1.8.2.jar:. Main
(The difference is that the paths are separated by ; on Windows or : on *nix)