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my code is :
import ir.sbu.nlp.wordnet.data.model.FNSense;
import ir.sbu.nlp.wordnet.data.model.FNSynset;
import ir.sbu.nlp.wordnet.data.model.FNSynsetsRelation;
import ir.sbu.nlp.wordnet.service.FNSynsetService;
import java.util.Vector;
public class sample2 {
public static void main(String[] args) {
FNSynsetService service=new FNSynsetService();
service.findAll();
}
}
and when I run it display this error
Data Load Started...
Exception in thread "main" java.lang.NullPointerException
at ir.sbu.nlp.wordnet.data.dao.FNWordDao.getTextNode(FNWordDao.java:513)
at ir.sbu.nlp.wordnet.data.dao.FNWordDao.loadWords(FNWordDao.java:438)
at ir.sbu.nlp.wordnet.data.dao.FNWordDao.<init>(FNWordDao.java:76)
at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.<init>(FNDaoManager.java:25)
at ir.sbu.nlp.wordnet.data.dao.FNDaoManager.getInstance(FNDaoManager.java:40)
at ir.sbu.nlp.wordnet.service.FNSynsetService.<init>(FNSynsetService.java:51)
at sample2.main(sample2.java:12)
Can every one help me?
I copy every file needed for installation
Seems like you need to set some object before calling service.findAll();
While this method is executing it might be trying to access some object which is turning out to be null. Debug and find out the exact line which is throwing NPE.
Related
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I'm new at Java, and I'm practicing creating different classes within the same file, and them using them as objects. But when it compiled, it gives me an error on line 07. This is my code so far:
import java.util.Scanner;
package functions;
public class functions {
public static void main (String args[]) {
Scanner sc = new Scanner(System.in);
functions fun = new functions();
fun.Print("Hello World");
}
public void Print(String text) {
System.out.print(text);
}
}
The error in question is:
Exception in thread "main" java.lang.Error: Unresolved compilation
problem: at functions.functions.main
I've tried to delete any class that were not main, I've tried to create the file without a package.
The package declaration should come before the import.
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I want to open MATLAB File(.m) using Java
I know MATLAB API.
It's a shame, but I don't know how to use it. How can I open MATLAB File(.m) using MATLAB API?
What should I do?
If possible, can you show an example code?
Thank you.
calling matlab function in java
1-first, add matlab as an Environment variable in windows.
in win10: search Environment variable, Edit environment variable, system variables, path, edit, new, ...
add [matlabroot]/bin/win64 to the path variables.
2-import matlab engine in your java class and use MatlabEngine and its functions :(eval,evalAsync,feval,...) :
import com.mathworks.engine.*; //import engine
public class javaEvalFunc {
public static void main(String[] args) throws Exception {
try{
MatlabEngine eng = MatlabEngine.startMatlab();
eng.evalAsync("[X, Y] = meshgrid(-2:0.2:2);");
eng.evalAsync("Z = X .* exp(-X.^2 - Y.^2);");
Object[] Z = eng.getVariable("Z");
eng.close();
}catch(Exception e){}
}
}
3-to call a specific .m routine, call it with its full path with eval,...
eng.eval("c:\temp\myroutine");
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Please suggest How can I improve my question
I ran my code but it throws cannot find main class error. I know this error comes when name of class with main method is different from file name. I tried to solve this error for an hour. I need help.
CountRows.java
import java.io.*;
import java.sql.*;
public class CountRows
{
public static void main(String args[])
{
System.out.println("Count number of rows in a specific table!");
Connection con = null;
int count = 0;
try
{
//Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/jdbctutorial","root","dics");
}
catch(Exception e)
{
System.out.println(e);
}
}
}
Execution
>javac -classpath "e:\softwares\java\jar files\mysql-connector-java-8.0.19.jar" CountRows.java
E:\user\java\jdbc\test>java -classpath "e:\softwares\java\jar files\mysql-connector-java-8.0.19.jar" CountRows
Error: Could not find or load main class CountRows
Edit: Although the solution works but I still don't understand what was wrong with my way of executing code
Your Code is working perfectly fine there is no issue in it.
I suggest you set classpath initially before using javac and java tools.
Set your classpath via CMD
set classpath="<EXTERNAL_JAR_FILES_PATH>"
I hope this might help you. If you are still facing the same issue you can ping me back. I will be happy to help you.
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This code works in Eclipse, but when I try to submit the 'Test' problem on the SPOJ site, it gives me a compilation error.
Can you please tell me why?
public class Test{
public static void main(String [] args)
{
java.util.Scanner input=new java.util.Scanner(System.in) ;
int n ;
while(true )
{
n =input.nextInt() ;
if(n==42)
break ;
else
System.out.println(n) ;
}
}
}
You have to name your class "Main" for it to work on SPOJ.
See this forum post for more information: https://www.spoj.com/forum/viewtopic.php?t=37
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I keep getting this error:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
at test.apples.main(apples.java:6)
My code is:
import java.util.Random;
class apples {
public static void main(String args[]) {
Random rand = new Random();
int freq[]=new int[7];
for(int roll=1;roll<1000;roll++) {
++freq[1+rand.nextInt(6)];
}
System.out.println("Face\tFrequency");
for(int face=1;face<freq.length;face++) {
System.out.println(face+"\t" +freq[face]);
}
}
}
You have to add package test; at the top of you class, then clean and rebuild your code.