I've been messing around with ClassLoaders in java recently, trying to run my automation script code which uses dynamic loading of classes and geting ClassNotFoundException.
##MyCode
package com.actitime5.frameworkengine;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
import com.gmail5.Testcases.LoginLogout;
import org.junit.runner.JUnitCore;
public class Init {
public static void main(String args[]) throws Exception
{
Init in=new Init();
String url=in.getConfigValue("url");
ExcelLibrary lib=new ExcelLibrary();
JUnitCore core = new JUnitCore();
int numberofTestcases=lib.getRowCont("Scenario");
System.out.println(numberofTestcases);
for(int i=1;i<=numberofTestcases;i++)
{String status=lib.getExcelData("Scenario", i, 1);
if(status.equals("yes"))
{String scriptnam=lib.getExcelData("Scenario", i, 0);
System.out.println("Sheet Name"+" "+scriptnam);
Class scriptToRun= Class.forName("com.gmail5.Testcases."+scriptnam);
core.run(scriptToRun);
}
}}
##Errors that i am getting :
1
Sheet Name LoginLogout
Exception in thread "main" java.lang.ClassNotFoundException:com.gmail5.Testcases.LoginLogout
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 com.gmail5.frameworkengine.Init.main(Init.java:24)
The class which I am trying to load is available in package: com.gmail5.Testcases.*;,but still it throws exception
I think your class name has trailing whitespace. Try trim()ming it off before attempting to load the class.
You can confirm this by replacing
System.out.println("Sheet Name"+" "+scriptnam);
with
System.out.println("Sheet Name"+" '"+scriptnam+"'");
I expect this will print out something like the following:
Sheet Name 'LoginLogout '
When I clicked 'edit' to edit your question, I could see there was trailing whitespace after the class name in the stack trace and in your Sheet Name message. (I didn't change anything in your question: I just used the Edit function to see the raw text of your question, and then clicked Cancel.)
Related
I have a problem during compilation of the program. The code itself has no errors.
Program code:
package plate;
import java.io.File;
import net.sourceforge.tess4j.Tesseract;
public class OcrReader {
public static void main(String[] args) throws Exception {
String inputFilePath = "C:\\Users\\Me\\eclipse-workspace\\platerecognition\\picture.tif";
Tesseract tesseract = new Tesseract();
String fullText = tesseract.doOCR(new File(inputFilePath));
System.out.println(fullText);
}
}
And the error after running the program:
Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/jna/Pointer
at plate.OcrReader.main(OcrReader.java:11)
Caused by: java.lang.ClassNotFoundException: com.sun.jna.Pointer
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
I am having a problem with use of this open source development kit - https://github.com/cdk/cdk
Here is the java code for BasicProgram:
import org.openscience.cdk.interfaces.IAtom;
import org.openscience.cdk.Atom;
public class BasicProgram {
public static void main(String args[]) throws Exception {
IAtom atom = new Atom("C");
System.out.println(atom);
}
}
When I go to compile the class file is generated without errors, but doesn't seem to find the references in the jar file:
E:\Cheminformatics>javac -cp cdk-2.0.jar BasicProgram.java
E:\Cheminformatics>java -cp . BasicProgram
Exception in thread "main" java.lang.NoClassDefFoundError: org/openscience/cdk/Atom
at BasicProgram.main(BasicProgram.java:6)
Caused by: java.lang.ClassNotFoundException: org.openscience.cdk.Atom
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
package photo;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.github.sarxos.webcam.Webcam;
public class capture {
public static void main(String arg[]) throws IOException {
Webcam webcam = Webcam.getDefault();
webcam.open();
BufferedImage image = webcam.getImage();
ImageIO.write(image, "JPG", new File("test.jpg"));
}
}
I have written this java code to capture photo through webcam, but this code is throwing an error/exception please tell how can I fix it.?
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at com.github.sarxos.webcam.Webcam.<clinit>(Webcam.java:97)
at photo.capture.main(capture.java:12)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
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)
... 2 more
Download SLF4J and put the slf4j-api-1.7.2.jar file onto your class path.
I have a Maven project in Eclipse created through m2e. It obtains client libraries from a project on GitHub called alternator. The classes seem to be imported fine, in my project, but on running them, it shows a NoClassDefFound error. Here's the code and the error:
Code:
public class Main{
private AlternatorDBClient client;
private DynamoDBMapper mapper;
private AlternatorDB db;
public static void main(String args[]) throws Exception{
new Main().run();
}
public void run() throws Exception {
this.client = new AlternatorDBClient();
this.mapper = new DynamoDBMapper(this.client);
this.db = new AlternatorDB().start();
}
}
Error:
Exception in thread "main" java.lang.NoClassDefFoundError: com/michelboudreau/alternator/AlternatorDBClient
at Main.run(Main.java:17)
at Main.main(Main.java:13)
Caused by: java.lang.ClassNotFoundException: com.michelboudreau.alternator.AlternatorDBClient
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)
... 2 more
The AlternatorDBClient class is importing one or more classes which are not on your class path:
import com.amazonaws.*;
import com.amazonaws.handlers.HandlerChainFactory;
import com.amazonaws.http.ExecutionContext;
import com.amazonaws.http.HttpResponseHandler;
import com.amazonaws.http.JsonErrorResponseHandler;
import com.amazonaws.http.JsonResponseHandler;
import com.amazonaws.services.dynamodb.AmazonDynamoDB;
import com.amazonaws.services.dynamodb.model.*;
import com.amazonaws.services.dynamodb.model.transform.*;
import com.amazonaws.transform.JsonErrorUnmarshaller;
import com.amazonaws.transform.JsonUnmarshallerContext;
import com.amazonaws.transform.Unmarshaller;
import com.amazonaws.util.json.JSONObject;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
You are somehow missing:
<dependency>
<groupId>com.amazonaws</groupId>
<artifactId>aws-java-sdk</artifactId>
</dependency>
as a dependency in your project pom. As AlexR stated, please post your pom.
When I generated a Java Client through the web page of wso2esb for a deployed service "Hello". In addition to the HelloServiceCallBackHandler.java and HelloServiceStub.java I created the class entitled HelloClient.java:
package org.wso2.cs.helloservices;
import java.rmi.RemoteException;
import org.wso2.cs.helloservices.HelloServiceStub.SayHello;
import org.wso2.cs.helloservices.HelloServiceStub.SayHelloResponse;
public class HelloClient {
public static void main(String[] args) {
try {
String name= new String("Test");
HelloServiceStub stub= new HelloServiceStub();
SayHello sh= new SayHello();
sh.setName(name);
SayHelloResponse resp=stub.sayHello(sh);
System.out.println("Response : "+resp);
}catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I have the following error:
<font color="red"> Exception in thread "main" java.lang.NoClassDefFoundError: javax/wsdl/extensions/soap/SOAPAddress
at org.wso2.cs.helloservices.HelloServiceStub.populateAxisService(HelloServiceStub.java:41)
at org.wso2.cs.helloservices.HelloServiceStub.<init>(HelloServiceStub.java:88)
at org.wso2.cs.helloservices.HelloServiceStub.<init>(HelloServiceStub.java:77)
at org.wso2.cs.helloservices.HelloServiceStub.<init>(HelloServiceStub.java:126)
at org.wso2.cs.helloservices.HelloServiceStub.<init>(HelloServiceStub.java:118)
at org.wso2.cs.helloservices.HelloClient.main(HelloClient.java:13)
Caused by: java.lang.ClassNotFoundException: javax.wsdl.extensions.soap.SOAPAddress
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)
... 6 more</font>
This seems to be required jars not found (This complains about wsld4j). Please add AXIS2_HOME/lib folder to your program's classpath .