I'm using org.json.JSONObject to pass the parameters to the server. And I'm using Eclipse IDE. I have already added the java-json.jar file to the build path of the project. but still I'm getting the below exception while running the code and no compilation error is displayed. I did clean the project and refreshed several times but still I end up with exception. is there anything missing?
Exception in thread "main" java.lang.NoClassDefFoundError: org/json/JSONObject
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.json.JSONObject
Download the Json jar from here and add it to the classpath. If its a web application then add its under lib's.
I have added the same java-json.jar file to the Run configuration's class path of the particular java file. And now it's working absolutely fine. thanks everyone!!!
Add maven dependency in pom.xml
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
</dependency>
Related
I have started using IntelliJ for my projects recently. I was trying to develop a simple maven project and got stuck into issue. I was trying to play around with kakfa-clients. Here is my dependencies
<dependencies>
<dependency>
<groupId>org.apache.kafka</groupId>
<artifactId>kafka-clients</artifactId>
<version>2.5.0</version>
</dependency>
</dependencies>
I tried doing maven clean and install. I see the following error after I execute the code.
C:\KB\SDA>java -cp target/SDA-1.0-SNAPSHOT.jar org.example.code.Demo
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/kafka/clients/producer/Producer
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.apache.kafka.clients.producer.Producer
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
However I could see the kafka-clients:2.5.0 is available in the External Libraries folder
I would like to know what could have gone wrong. Any hint would definitely help.
Java version 8
IntellJ 2020.1
Kafka-Client itself is dependent on other dependencies. Have a look here https://mvnrepository.com/artifact/org.apache.kafka/kafka-clients/2.5.0
Give a shot by including other jars in the classpath.
java -cp target/*.jar:. org.example.code.Demo
I have a java program that uses dynamic reports fine in netbeans, and even works in exe and jar when I first run it. However, if I share the jar/exe (I've even sent it and re-downloaded it on my own computer), I get an error java.lang.classnotfoundexception: net.sf.jasperreports.engine.jrdatasource. However, I have double checked my jars and I do have this class. What could be the source of this problem then?
Thanks
Edit: full error:
Exception in thread "main" java.lang.NoClassDefFoundError:
net/sf/jasperreports/engine/JRDataSource
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException:
net.sf.jasperreports.engine.JRDataSource
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
if you get Caused by: java.lang.ClassNotFoundException: inside a jar file then, you need to provide the classpath arguments;
example:
java -cp my.jar -jar ExternalJarFileName.jar
you can also provide all jars use below command, only need to create a directory and put all external jars in to it and use path of directory in to below command:
java -cp my.jar;C:\externalJar\* mainpackage.MainClass
I want to test tess4j to do OCR. I used the following tutorial for a first example: http://tess4j.sourceforge.net/codesample.html
I included the required libraries, but I am getting the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at net.sourceforge.tess4j.Tesseract.<clinit>(Unknown Source)
at tess4jexample.TesseractExample.main(TesseractExample.java:10)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more
Does anyone knows a solution for this?
Tess4J has several dependencies. You'll need to include them in the classpath.
There has where still some dependencies missing, which have not been mentioned on the mavenrepository:
logback-core-1.1.6.jar
slf4j-api-1.7.21.jar
I think now it is working :-) Thank you nguyenq for this hint, to check the dependencies.
I am trying to get started with Drools 6x, and in eclipse, I have created a Drools project, which creates the boilerplate code to run a simple drl.
I have the drools runtime installed via Eclipse.
I have drools libraries, drools-core-5.0.1.jar,kie-api-6.0.0.beta4.jar,kie-internal-6.0.0.beta2.jar as External jars in my project.
Yet, when I try to run the following, I get the following error:
java.lang.ExceptionInInitializerError
at com.sample.PetStoreExample.init(PetStoreExample.java:78)
at com.sample.PetStoreExample.main(PetStoreExample.java:67) Caused by: java.lang.RuntimeException: Unable to instance KieServices
at org.kie.api.KieServices$Factory.<clinit>(KieServices.java:137)
... 1 more Caused by: java.lang.ClassNotFoundException:org.drools.compiler.kie.builder.impl.KieServicesImpl at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.kie.api.KieServices$Factory.<clinit>(KieServices.java:165)
... 1 more
If you downloaded the zip of Jars from http://www.drools.org/, you're going to want to include every jar from /binaries in your project. Even the ones that seem like you won't use.
I had this same problem too because I assumed I only needed to use a few Jars, but it turns out they all depend on classes from the other jars in that zip folder.
I had this problem because I had both kie-api and kie-ci as dependencies in my pom file. I removed the kie-ci dependency and I'm not getting this issue any more.
I'm trying to run the sample "Hello World" from the LWJGL website
From this link: LWJGL "Getting Started"
I'm trying to do this via the command line, just so I understand the "behind the scenes" a bit better.
I've managed to compile without any errors, but when I try to run the program I'm getting this error:
C:\JavaProjects\LearningLWJGL>java -classpath .;./lib/*.jar -Djava.library.path=C:\Windows\System32 HelloWorld
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: org/lwjgl/glfw/GLFWKeyCallback
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
at java.lang.Class.privateGetMethodRecursive(Unknown Source)
at java.lang.Class.getMethod0(Unknown Source)
at java.lang.Class.getMethod(Unknown Source)
at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.lwjgl.glfw.GLFWKeyCallback
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 7 more
Any ideas?
A CLASSPATH entry is either a directory at the head of a package hierarchy of .class files, or a .jar file. If you're expecting ./lib to include all the .jar files in that directory, it won't. You have to name them explicitly.
I had same issue using different dependancy what helped me is to set scope to compile.
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>compile</scope>
</dependency>