HelloWorldApp - Exception in thread "main" ...
the following program saved as c:\windows\desktop\java\HelloWorldApp.java gives the following error when run from the command line as:
java HelloWorldApp
Exception in thread "main" java.lang.NoClassDefFoundError:helloworldapp
I have added C:\PROGRA~1\Java\j2re1.4.0_01\lib to the path in autoexec.bat. That did not work so I tried c:\progra~1\java\j2re1.4.0_01\bin. Again, the same error. Any suggestions would be greatly appreciated from a new (1st day) java wannabe.
Thanks in advance,
Kev
Hi Kev...
I think... you better understand about Java Compiler and JVM ...The exception that is arising is that is JVM is unable to search your HelloWorldApp main class..... I think .....you should make these changes in your Autoexec.bat file .......
Path=%Path%;c:\j2skd1.4.0_01\bin
Set classPath=c:\windows\desktop
Doskey
Then restart your computer or simply run autoexec.bat file ...
you compile your program by this command...
javac HelloWorldApp.java
then Run your Program
java HelloWorldApp
you have to care about case sensitive ......
I think ... It will help you .... best Regards
ARSHOO
Similar Messages
-
Hello World App : Exception in thread "main" java.lang.NoClassDefFoundErro
Hi
I have downloaded a latest version of JDK, I have several other versions on my machine from other times i endeavored to work on Java, but never got to doing so.
I have compiled the HelloWorldApp (code below) but when i try to run it, I get the error below: My java version is listed as 1.5.0_06. Any insight would be great.
F:\GamingExtravaGanza>java HelloWorldApp.class
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp/class
* The HelloWorldApp class implements an application that
* simply prints "Hello World!" to standard output.
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!"); // Display the string.
}F:\GamingExtravaGanza>java -version
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)
MikeI had tried without the class extension, too. Anyone have ideas for why i am getting the error ?
F:\GamingExtravaGanza>java HelloWorldApp
Exception in thread "main" java.lang.UnsupportedClassVersionError:
umber in .class file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Sour
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Metho
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Sourc
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source) -
Exception in thread "main" java.lang.NoClassDefFoundError: HW
I am very new to java. Tried to take the time to learn but got wrapped up in other things. Now I am back to learn and here is what I am getting. I don't know if it has anything to do with java required files being in a different directory or what. I have my java sdk files in C:\Program Files\Java\jre1.6.0_05\ and the source file is in C:\Java
Here is more information.
My Error at runtime:_
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp
My actions in the shell:_
C:\Java>javac HW.java
C:\Java>java HW
Exception in thread "main" java.lang.NoClassDefFoundError: HW
Caused by: java.lang.ClassNotFoundException: HW
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
My Source:_
* The HelloWorldApp class implements an application that
* simply prints "Hello World!" to standard output.
class HW {
public static void main(String[] args) {
System.out.println("Hello World!"); // Display the string.
}My Error at runtime:_
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp
Exception in thread "main" java.lang.NoClassDefFoundError: HW
Caused by: java.lang.ClassNotFoundException: HWO_o
That's two different errors.
Try to execute with:
java -cp . HW -
Here is my Java:
package classes.com.mattclark.hw;
import java.lang.*;
public class Hw {
private static Object mainClass = null;
private Short var1 = null;
public Hw(){
var1 = new Short("0");
System.out.println("| Class Name | Minimum Value | Maximum Value |");
System.out.println("----------------------------------------------------------------------------");
System.out.println("| " + rPad(var1.getClass().getName(), 20) +
" |" + lPad(String.valueOf(var1.MIN_VALUE), 24) +
" |" + lPad(String.valueOf(var1.MAX_VALUE), 24) +
" |" );
private String rPad(String initialString, int width) {
String returnString = null;
if(initialString.length() >= width) {
// truncate the string and return it
returnString = initialString.substring(0, width-1);
} else {
returnString = initialString;
for(int i=initialString.length(); i<width; i++) {
// pad the return string to the right
returnString = returnString.concat(" ");
return returnString;
private String lPad(String initialString, int width) {
String returnString = null;
if(initialString.length() >= width) {
// truncate the string and return it
returnString = initialString.substring(0, width-1);
} else {
returnString = new String("");
for(int i=initialString.length(); i<width; i++) {
// pad the return string to the right
returnString = returnString.concat(" ");
returnString = returnString.concat(initialString);
return returnString;
public static void main(String[] args) {
mainClass=new Hw();
} I have tried other solution from other "Exception in thread "main"" posts
I have tried all kinds of CLASSPATH's
My teacher said to use: Set CLASSPATH=D:\java3\hw\classesMy Error at runtime:_
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp
Exception in thread "main" java.lang.NoClassDefFoundError: HW
Caused by: java.lang.ClassNotFoundException: HWO_o
That's two different errors.
Try to execute with:
java -cp . HW -
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp
I have set the path, classpath and also compiled the HelloWorldApp.java file and my main is public static void main.
public class HelloWorldApp
public static void main(String[] args)
// Display "Hello World!"
System.out.println("Hello World!");
I still get this error
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldAppFor better understanding:
I have set the classpath in the autoexec.bat following:
set CLASSPATH="C:\TEST;.;";
and I have a userdefined class in c:\jdk1.3.1_01\jre\lib\ext\myclass.jar
compiling works, but when I run the program in c:\TEST\Hello.java I get the java.lang.NoClassDefFoundError Message.
My source code looks like this:
import myclass.*;
public class Hello extends MyClass{
public static void main(String[] args) {
System.out.println("Hello"); -
Exception in thread "main" java.lang.NoClassDefFoundError
Am using java 1.3.1 on Red Hat Linux 7.1
i get this error
Exception in thread "main" java.lang.NoClassDefFoundError
while running a simple program HelloWorld.java
helpWhen you use the "java" command, the only required argument is the name of the class that you want to execute. This argument must be a class name, not a file name, and class names are case sensitive. For example, "java HelloWorld.java" won't work because the class name isn't HelloWorld.java, it's HelloWorld. Similarly, "java helloworld" won't work because a class defined as "public class HelloWorld {" is not named helloworld due to case sensitivity. Finally, the .class file must be in a directory that is in the Classpath - that's where java.exe searches to find the file that contains the class.
-
HELP Needed with this error: Exception in thread "main" java.lang.NoClass
Folks,
I am having a problem connecting to my MSDE SQL 2000 DB on a WindowsXP pro. environment. I am learning Java and writing a small test prgm to connect the the database. The code compiles ok, but when I try to execute it i keep getting this error:
"Exception in thread "main" java.lang.NoClassDefFoundError: Test1"
I am using the Microsoft jdbc driver and my CLASSPATH is setup correctly, I've also noticed that several people have complained about this error, but have not seen any solutions....can someone help ?
Here is the one of the test programs that I am using:
import java.sql.*;
* Microsoft SQL Server JDBC test program
public class Test1 {
public Test1() throws Exception {
// Get connection
DriverManager.registerDriver(new
com.microsoft.jdbc.sqlserver.SQLServerDriver());
Connection connection = DriverManager.getConnection(
"jdbc:microsoft:sqlserver://LAPTOP01:1433","sa","sqladmin");
if (connection != null) {
System.out.println();
System.out.println("Successfully connected");
System.out.println();
// Meta data
DatabaseMetaData meta = connection.getMetaData();
System.out.println("\nDriver Information");
System.out.println("Driver Name: "
+ meta.getDriverName());
System.out.println("Driver Version: "
+ meta.getDriverVersion());
System.out.println("\nDatabase Information ");
System.out.println("Database Name: "
+ meta.getDatabaseProductName());
System.out.println("Database Version: "+
meta.getDatabaseProductVersion());
} // Test
public static void main (String args[]) throws Exception {
Test1 test = new Test1();I want to say that there was nothing wrong
with my classpath config., I am still not sure why
that didn't work, there is what I did to resolved
this issue.You can say that all you like but if you are getting NoClassDefFound errors, that's because the class associated with the error is not in your classpath.
(For future reference: you will find it easier to solve problems if you assume that the problem is your fault, instead of trying to blame something else. It almost always is your fault -- at least that's been my experience.)
1. I had to set my DB connection protocol to TCP/IP
(this was not the default), this was done by running
the
file "svrnetcn.exe" and then in the SQL Server Network
Utility window, enable TCP/IP and set the port to
1433.Irrelevant to the classpath problem.
2. I then copied all three of the Microsoft JDBC
driver files to the ..\jre\lib\ext dir of my jdk
installed dir.The classpath always includes all jar files in this directory. That's why doing that fixed your problem. My bet is that you didn't have the jar file containing the driver in your classpath before, you just had the directory containing that jar file.
3. Updated my OS path to located these files
and....BINGO! (that simple)Unnecessary for solving classpath problems.
4. Took a crash course on JDBC & basic Java and now I
have created my database, all tables, scripts,
stored procedures and can read/write and do all kinds
of neat stuff.All's well that ends well. After a few months you'll wonder what all the fuss was about. -
Hi
I am trying to use type 4 driver to connect to my Oracle 9i Rel2 database. I downloaded the odbc14.jar from oracle and added in the C:\Oracle9i\jdbc\lib path. As on the website, I setup my environment:
Setting Up Your Environment
On Win95/Win98/NT:
- Add [ORACLE_HOME]\jdbc\lib\classes111.zip and
[ORACLE_HOME]\jdbc\lib\nls_charset11.zip to your CLASSPATH.
(Add classes12.zip and nls_charset12.zip if JDK 1.2.x or 1.3 is
used. Add ojdbc14.jar and nls_charset12.zip if JDK 1.4 is used.)
- Make sure [ORACLE_HOME]\bin is in your PATH.
Still I am getting the following error during runtime:
Exception in thread "main" java.lang.ClassNotFoundException: oracle.jdbc.driver.OracleDriver
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.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at jdbc.InsertQueryEx.main(InsertQueryEx.java:11)
Below is the source code:
import java.sql.*;
import java.io.*;
public class InsertQueryEx {
public static void main(String[] args)throws Exception{
Class.forName("oracle.jdbc.OracleDriver");
Connection con = DriverManager.getConnection("jdbc:oracle:thin:@Prashy:1521:orcl", "scott", "tiger");
DataInputStream din = new DataInputStream(System.in);
Statement stmt = con.createStatement();
while(true){
try{
System.out.println("enter emp name");
String name = din.readLine();
System.out.println("enter emp no");
int no = Integer.parseInt(din.readLine());
System.out.println("enter emp salary");
float sal = Float.parseFloat(din.readLine());
System.out.println("enter emp address");
String addr = din.readLine();
int count = stmt.executeUpdate("insert into myemp values("+no+",'"+name+"',"+sal+",'"+addr+"')");
if(count>0)
System.out.println("Record added");
else
System.out.println("Failed");
catch (Exception e){
System.err.println("Exception: "+e.getMessage());
Any help is appreciated
Thanks
PrashantI am sorry but I did add those in the classpath but still getting this error:
This is what I have for user variable in classpath:
.;C:\Oracle9i\jdbc\lib\ojdbc14.jar;C:\Oracle9i\jdbc\lib\nls_charset12.jar
error is:
java.lang.ClassNotFoundException: oracle.jdbc.OracleDriver
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.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at jdbc.InsertQueryEx.main(InsertQueryEx.java:14)
Thanks -
DB:11.1.0.7
Oracle Apps:12.1.1
OS:RHEL Linux 4 86x64
Hi All,
On executing the following command on node 2 of TEST instance, we received the following error but did not find any such error messages in node 1
Notes: (1) Node 1 has java version:
java -version
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)
(2) Node 2 has java version:
java -version
java version "1.4.2"
gcj (GCC) 3.4.6 20060404 (Red Hat 3.4.6-9)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Error message in node2:
On executing the following command on node 2 of TEST instance, we received the following error:
java oracle.jrad.tools.xml.importer.XMLImporter /tmp/custdocs/oracle/apps/pos/home/webui/customizations/site/0/PosHpgOrders.xml ....
/usr/bin/java: line 36: [: `)' expected, found -
Exception in thread "main" java.lang.VerifyError: verification failed at PC 152 in oracle.jdbc.driver.OracleDriver:registerMBeans(()V): String, int, or float constant expected
at JvBytecodeVerifier.verify_fail(byte, int) (/usr/lib64/libgcj.so.5.0.0)
at JvBytecodeVerifier.verify_instructions_0() (/usr/lib64/libgcj.so.5.0.0)
at JvVerifyMethod(_Jv_InterpMethod) (/usr/lib64/libgcj.so.5.0.0)
at JvPrepareClass(java.lang.Class) (/usr/lib64/libgcj.so.5.0.0)
at JvWaitForState(java.lang.Class, int) (/usr/lib64/libgcj.so.5.0.0)
at java.lang.VMClassLoader.linkClass0(java.lang.Class) (/usr/lib64/libgcj.so.5.0.0)
at java.lang.VMClassLoader.resolveClass(java.lang.Class) (/usr/lib64/libgcj.so.5.0.0)
at java.lang.Class.initializeClass() (/usr/lib64/libgcj.so.5.0.0)
at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader) (/usr/lib64/libgcj.so.5.0.0)
at oracle.adf.mds.tools.util.ConnectUtils.getDBConnection(java.lang.String) (Unknown Source)
at oracle.jrad.tools.xml.importer.XMLImporter.importDocuments(java.lang.String[], java.sql.Connection) (Unknown Source)
at oracle.jrad.tools.xml.importer.XMLImporter.main(java.lang.String[]) (Unknown Source)
Could anyone please share such an issue faced before and provide resolution as to what's wrong in here in node 2?
Thanks for your time!
Regards,Hi,
(2) Node 2 has java version:
java -version
java version "1.4.2"Do you run this command as applmgr user? If yes, did you source the application env file?
Could anyone please share such an issue faced before and provide resolution as to what's wrong in here in node 2?Why the java version is different on the both nodes?
Thanks,
Hussein -
Exception in thread "main" java.lang.NullPointerException
hi
I am new to Java, and taking an introductory course in java. I wrote the code given bellow and get following error "C:\java\assingment2>java test123
Exception in thread "main" java.lang.NullPointerException
at PartCatalog.Add(test123.java:56)
at test123.main(test123.java:102)"
Can any body help me please
import java.util.*;
class PartRecord
public String PartName;
public String PartNumber;
public float Cost;
public int Quantity;
public static int counter ;
public PartRecord()
{ PartName ="";
PartNumber="";
Cost = 0;
Quantity = 0;
counter = 0;
public void Set(String name, final String num,
float cost, int quantity)
PartName = name;
PartNumber= num;
Cost = cost;
Quantity = quantity;
counter++;
public float Get()
return Cost*Quantity;
public static int Counter() {return counter;}
class PartCatalog
public PartCatalog()
npart=0;
public void Add(String name, String num,
float cost, int quantity)
if(npart>=1000) return;
Parts[npart++].Set(name,num,cost,quantity);
public float ShowInventory()
int inventory = 0;
for(int i=0; i<npart; i++)
inventory+= Parts.Get();
return inventory;
public PartRecord[] Parts = new PartRecord[1000];
public int npart;
class ExtPartCatalog extends PartCatalog
public void Sort()
Arrays.sort(Parts);
public void Print()
for(int i=0; i<npart; i++)
System.out.println ( Parts[i].PartName + "\t "
+ Parts[i].PartNumber + "\t "
+ Parts[i].Cost + "\t "
+ Parts[i].Quantity + "\n");
class test123{
public static void main(String args[])
ExtPartCatalog catalog = new ExtPartCatalog();
catalog.Add("tire ", "1", 45, 200);
catalog.Add("microwave", "2", 95, 10);
catalog.Add("CD Player", "3", 215, 11);
catalog.Add("Chair ", "4", 65, 10);
catalog.Sort();
catalog.Print();
System.out.println("Inventory is " + catalog.ShowInventory());
ExtPartCatalog catalog2 = new ExtPartCatalog();
catalog2.Add("ttt ", "1", 45, 200);
System.out.print("\n\nTotally there are " + PartRecord.Counter() );
System.out.println(" Parts being set" );Thank you for your reply. I think i used
public PartRecord[] Parts = new PartRecord[1000];
so i have created the reference. I tries what you told me but it still did not work. I am putting the code again, but now in the formatted form so that you can read it more easily. I will appreciate your help. Thanks
<code>
import java.util.*;
class PartRecord
{ public String PartName;
public String PartNumber;
public float Cost;
public int Quantity;
public static int counter ;
public PartRecord()
PartName ="";
PartNumber="";
Cost = 0;
Quantity = 0;
//counter = 0;
public void Set(String name, final String num,
float cost, int quantity)
PartName = name;
PartNumber= num;
Cost = cost;
Quantity = quantity;
counter++;
public float Get()
return Cost*Quantity;
public static int Counter() {return counter;}
class PartCatalog
{ public PartRecord[] Parts = new PartRecord[1000];
public int npart;
public PartCatalog()
npart=0;
public void Add(String name, String num,
float cost, int quantity)
if(npart>=1000) return;
Parts[npart++].Set(name,num,cost,quantity);
public float ShowInventory()
float inventory = 0;
for(int i=0; i<npart; i++)
inventory= Parts[npart].Get();
return inventory;
/*class ExtPartCatalog extends PartCatalog
public void Sort()
Arrays.sort(Parts);
public void Print()
for(int i=0; i<npart; i++)
System.out.println ( Parts.PartName + "\t "
+ Parts[i].PartNumber + "\t "
+ Parts[i].Cost + "\t "
+ Parts[i].Quantity + "\n");
class azimi_a{
public static void main(String args[])
PartCatalog c = new PartCatalog() ;//= new PartCatalog[4];
c.Add("tire ", "1", 45, 200);
c.Add("microwave", "2", 95, 10);
c.Add("CD Player", "3", 215, 11);
c.Add("Chair ", "4", 65, 10);
<code> -
Exception in thread "main" trouble
I'm using NetBeans IDE 3.5.1 and every single program I've tried to write always comes out with, "java.lang.NoClassDefFoundError: (file name) Exception in thread "main" when I try to execute it. Here's a sample program;
// Tests to see whether a floating point is zero or not
class testZero{
public static void main(String args[]) {
float theNumber = 12;
System.out.println(theNumber);
What am I doing wrong?Apprently the file name of the .java file and the complied variant needs to be the same as the class the file contains.
Yes, if the class is public. It's good practice always.
Also, check out this document: http://java.sun.com/docs/codeconv/html/CodeConventions.doc8.html
It covers naming conventions, which are a little different in Java if you have experience with another language. In accordance with these guidelines, your class should be named TestZero, not testZero. Following the standard naming conventions makes your code easier for other Java programmers to read and understand. -
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
hi to all.
iam getting this error: could any one give me the solution.
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at DinosaursDataLoader.getData(DinosaursDataLoader.java:49)
at DinosaursPack.load(DinosaursPack.java:22)
at DinosaursPack.<init>(DinosaursPack.java:18)
at myproject.main(myproject.java:17)
import java.util.*;
import java.io.*;
import javax.swing.ImageIcon;
public class Driver {
public static void main (String[] args) {
// create a Scanner and grab the data . . .
File f=new File("C:\\Users\\hariprasad koineni\\Desktop\\r.txt");// my text file containes 12 dinosuor card info
Scanner scanner = null;
try {
scanner = new Scanner(f);
} catch (FileNotFoundException fnf) {
System.out.println(fnf.getMessage());
System.exit(0);
// scan file line-by-line
scanner.useDelimiter("------------------------------------------------------------------");
int y=0;
while (scanner.hasNext()) {
String line = scanner.next().trim();
System.out.println(line);
String bits[]= new String[19];
String[] bit = line.split("\n"); // Regex available since Java 5
for(int j=0;j<=(bit.length-1);j++){
String[] bis = bit[j].split(":");
System.out.println(bis[0]);
String t=bis[1].trim();
bits[j]=t;
System.out.println(bits[j]);
System.out.println(j);
String t = bits[0]; // title
String imgFileName = bits[1]; // image file name
float h = Float.parseFloat(bits[2]); // height
String w = bits[3]; // weight
String l = bits[4]; // length
int kr = Integer.parseInt(bits[5]); // killer rating
String i = bits[6]; // intelligence
int a = Integer.parseInt(bits[7]); // age
String df = bits[8]; // dino file
// create the image
y++;
System.out.println(line);
System.out.println(y);
}h_koineni wrote:
sorry
iam getting the error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
at Driver.main(Driver.java:38)So meaning this line cause the exception:
String t=bis[1].trim(); // hard-coded int literal 1That happens because, in line 36,
String[] bis = bit[j].split(":");What will happen if the delimiter ':' is not found? It will return an array with a size of 1, and at this time referencing index 1 is out of bound, remember that the upper bound of an array is its size-1. One workaround is to put a selection structure after line 36.
if (bis != null && bis.length == 2) {
String t=bis[1].trim();
bits[j]=t;
}Then, recompile your code and try again. -
Exception in thread "main" java.lang.NumberFormatException:For input String
this is a code about arrylist. but when I debug it.it metion:Exception in thread "main" java.lang.NumberFormatException:For input String at java.lang.NumberFormatException.forInputString(numberFomatExceptionio java:48)
at java.lang.Integer.parseInt(integer.java:468)
at java.lang.Integer.parseInt(integer.java:497)
at Get.getInt(manerger.java:208)
at LinkList.insertFirst(manager.java:94)
at manager.main(manager.java;20)
this is my code:
import java.io.*;
import java.lang.*;
public class manager
public static void main(String args[]) throws IOException
LinkList list=new LinkList();
System.out.println("input S can scan the grade\ninput D can delete one entry\ninput U can update the entry\ninput A can add one entry\ninput E can end");
int cr=System.in.read();
switch(cr)
case 'A':
list.insertFirst();break;//this is 20 row
case 'S':
System.out.println("input the s");break;
case 'D':
System.out.println("input the d");break;
case 'U':
System.out.println("input the u");break;
class Link
public int number;
public String name=new String();
public int chs;
public int eng;
public int math;
public Link next;
public Link(int number,String name, int chs,int eng,int math)
this.number=number;
this.name=name;
this.chs=chs;
this.eng=eng;
this.math=math;
public Link()
this(0,"",0,0,0);
public void displayLink()
System.out.println(number + " "+name+ " "+chs+ " "+eng+ " "+math+ " ");
class LinkList
public Link first;
public LinkList()
first = null;
public boolean isEmpty()
return first==null;
public void displayList()
System.out.println("");
Link current=first;
while(current!=null)
current.displayLink();
current=current.next;
System.out.println("");
public Link insertFirst() throws IOException
Get getdata=new Get();
int number=getdata.getInt();//this is 94 row
String name=getdata.getString();
int chs=getdata.getInt();
int eng=getdata.getInt();
int math=getdata.getInt();
Link newLink = new Link(number,name,chs,eng,math);
first=newLink;
return first;
public Link find(int key)
Link current=first;
while(current.number!=key)
if(current.next==null)
return null;
else
current=current.next;
return current;
public Link update(int key) throws IOException
Link current=first;
while(current.number!=key)
if(current.next==null)
return null;
else
System.out.println("Input the first letter of the subject:");
int c=System.in.read();
Get get=new Get();
switch(c)
case 'c':
current.chs=get.getInt();break;
case 'e':
current.eng=get.getInt();break;
case 'm':
current.math=get.getInt();break;
return current;
public float average(char key)
Link current=first;
float total=0;
float average=0;
float counter=0;
if(current==null)
return 0;
while(current!=null)
switch(key)
case 'c':
total=current.chs+current.next.chs;break;
case 'e':
total=current.eng+current.next.eng;break;
case 'm':
total=current.math+current.next.math;break;
current=current.next.next;
counter++;
average=total/counter;
return average;
public Link delete(int key)
Link current=first;
Link previous=first;
while(current.number!=key)
if(current.next==null)
return null;
else
previous=current;
current=current.next;
if(current==first)
first=first.next;
else
previous.next=current.next;
return current;
class Get
public static String getString() throws IOException
System.out.println("Input your name:");
InputStreamReader str = new InputStreamReader(System.in);
BufferedReader br = new BufferedReader(str);
String s = br.readLine();
return s;
public static int getInt() throws IOException
System.out.println("Input your data:");
String st = getString();
return Integer.parseInt(st);//this is 208 row
}It may be that the code in getString() returns a
String that ends with a newline. If that is the
problem, you can use
return (Integer.parseInt(st)).trim();1. getString will never return a String ending in newline. BufferedReader.readLine strips off the newline.
2. Even if you had a newline, String.trim doesn't trim newlines.
3. You would need to trim the String, not the int:
return (Integer.parseInt(st.trim()));As JimDinosaur said, you are passing bad data (the value of "st").
In getInt, add this before trying to parse "st":
System.out.println("###"+st+"###");What does it print? -
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
I am getting error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
Pls tell me where I am wrong:
import javax.swing.JOptionPane;
import java.io.File;
import java.io.*;
import java.io.IOException;
import java.util.*;
class Test {
String lname, fname, finalLetterGrade, LetterGrade, sub1,sub2,sub3,sub4,sub5,sub;
int testone = 0;
int a=0,b,c,d,e, count= 0, abs = 0,j;
int testtwo = 0;
int testthree = 0;
int testfour = 0;
int testfive = 0;
int finalExamGrade = 0;
int i=0;
int participation = 0;
int lowScore = 0;
int abs1,abs2,abs3,abs4,abs5;
String s="absent";
Character ch;
String []name;
int []Mark;
double finalNumericGrade = 0;
public Test() {
public void inputGrades()
int input, row, col;
Scanner scan = new Scanner(System.in);
System.out.println("Enter the length of the square matrix: ");
col = scan.nextInt();
name = new String[col];
Mark = new int[col];
for(i = 0; i < col ; i++)
name=JOptionPane.showInputDialog("Enter Student Name"+(i+1)+" Name: ");
System.out.println(name[i]);
for(j=0; j < col;j++)
Mark[j]=Integer.parseInt(JOptionPane.showInputDialog("Marks "+(j+1)+" Mark: "));
System.out.println(Mark[j]);
System.out.println("Average-->"+getAverage());
System.out.println("Student'-->"+toString());
public double getAverage()
if( Mark[0]==0 || Mark[1]==0 || Mark[2]==0 || Mark[3]==0 || Mark[4]==0)
finalNumericGrade=((((float)(Mark[0])) + ((float)(Mark[1])) + ((float)(Mark[2])) + ((float)(Mark[3])) + ((float)(Mark[4])))/4);
else
finalNumericGrade=((((float)(Mark[0])) + ((float)(Mark[1])) + ((float)(Mark[2])) + ((float)(Mark[3])) + ((float)(Mark[4])))/5);;
return finalNumericGrade;
private String letterGrade(){
//System.out.println(" +++ finalNumericGrade " + finalNumericGrade );
if ((finalNumericGrade >= 3.50) & (finalNumericGrade <= 4))
finalLetterGrade = "A";
else
if ((finalNumericGrade >= 2.50) & (finalNumericGrade < 3.50))
finalLetterGrade = "B";
else
if ((finalNumericGrade >= 2) & (finalNumericGrade < 2.50))
finalLetterGrade = "C";
else
if ((finalNumericGrade >= 1) & (finalNumericGrade < 2))
finalLetterGrade = "D";
else
if (finalNumericGrade == 0)
finalLetterGrade = "X";
else finalLetterGrade ="Z";
return finalLetterGrade;
public int getAbsentee()
if(testone == 0)
abs1=1;
if(testtwo == 0)
abs2=1;
if(testthree == 0)
abs3=1;
if(testfour == 0)
abs4=1;
if(testfive == 0)
abs5=1;
return abs=abs1+abs2+abs3+abs4+abs5;
public String AbsentSub()
if((testone < testtwo) & (testone < testthree) & (testone < testfour) & (testone < testfive))
sub=sub1;
if((testtwo < testone) & (testtwo < testthree) & (testtwo < testfour) & (testtwo < testfive))
sub=sub2;
if((testthree < testone) & (testthree < testtwo) & (testthree < testfour) & (testthree < testfive))
sub=sub3;
if((testfour < testone) & (testfour < testthree) & (testfour < testtwo) & (testfour < testfive))
sub=sub4;
if((testfive < testone) & (testfive < testtwo) & (testfive < testthree) & (testfive < testfour))
sub=sub5;
return sub;
public int getLowScore(){
//Determine and return the lowest score
lowScore = testone;
if (testtwo < lowScore) lowScore = testtwo;
if (testthree < lowScore) lowScore = testthree;
if (testfour < lowScore) lowScore = testfour;
if (testfive < lowScore) lowScore = testfive;
return lowScore;
public String toString() {
String studentStringValue="\n\nStudent " sub1 " "+sub2+" "+sub3+" "+sub4+" "+sub5+ " Lowest Final Marks \n\n";
studentStringValue+= name[i]+"\t";
if(Mark[0]==0)
studentStringValue+="" s "\t";
else
a=Mark[0];
ch = new Character(((char) ((69-a))));
studentStringValue+= Mark[0]+" "+ch+ "\t";
if(Mark[1]==0)
studentStringValue+="" s "\t";
else
b=Mark[1];
ch = new Character(((char) ((69-b))));
studentStringValue+= Mark[1]+" "+ch+ "\t";
if(Mark[2]==0)
studentStringValue+="" s "\t";
else
c=Mark[2];
ch = new Character(((char) ((69-c))));
studentStringValue+=Mark[2] +" "+ch+ "\t";
if(Mark[3]==0)
studentStringValue+="" s "\t";
else
d=Mark[3];
ch = new Character(((char) ((69-d))));
studentStringValue+= Mark[3] +" "+ch+ "\t";
if(Mark[4]==0)
studentStringValue+="" s "\t";
else
e=Mark[4];
ch = new Character(((char) ((69-e))));
studentStringValue+=Mark[4] +" "+ch+ "\t";
try {
BufferedWriter out = new BufferedWriter(new FileWriter(".//Marks3.txt", true));
out.write(studentStringValue);
out.close();
} catch (IOException e) {
//studentStringValue+=" " + abs + " ";
//studentStringValue+=" " sub"\t";
studentStringValue+=" " + finalNumericGrade + " \n\n";
//studentStringValue+=" Final Letter Grade is: " + finalLetterGrade +"\n";
return studentStringValue;
}// toString
public void printName(){
System.out.print(" "+lname);
System.out.print(" "+fname);
public static void main(String[] args)
Test s = new Test();
s.inputGrades();
System.out.println("Average-->" +s.getAverage());
//System.out.println("Average-->" +s.setAverage());
//System.out.println("Absent students in each Test-->" + s.getAbsentee());
// s.getLowScore();
//System.out.println("Final Letter Grade --> " + s.letterGrade());
// s.AbsentSub();
System.out.println(""+ s.toString());hi,
I am getting error on line 232 n 339
My error is :
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at Test.toString(Test.java:232)
at Test.main(Test.java:339)
my code is :
import javax.swing.JOptionPane;
import java.io.File;
import java.io.*;
import java.io.IOException;
import java.util.*;
class Test {
String lname, fname, finalLetterGrade, LetterGrade, sub1,sub2,sub3,sub4,sub5,sub;
int testone = 0;
int a=0,b,c,d,e, count= 0, abs = 0,j,ab,abm=0,abj=0,abn=0,abd=0;
int testtwo = 0;
int testthree = 0;
int testfour = 0;
int testfive = 0;
int finalExamGrade = 0;
int i=0;
int participation = 0;
int lowScore = 0;
int abs1,abs2,abs3,abs4,abs5;
String s="absent";
Character ch;
String []name;
String[] subj;
int []Mark;
double finalNumericGrade = 0;
public Test() {
public void inputGrades()
int input, row, col;
Scanner scan = new Scanner(System.in);
System.out.println("Enter the length of Array: ");
col = scan.nextInt();
name = new String[col];
subj = new String[5];
Mark = new int[5];
for(i = 0; i < col ; i++)
name=JOptionPane.showInputDialog("Enter Student Name"+(i+1)+" Name: ");
System.out.println(name[i]);
for(j=0; j < 5;j++)
subj[j]=JOptionPane.showInputDialog("Enter Subject"+(j+1)+" Name: ");
Mark[j]=Integer.parseInt(JOptionPane.showInputDialog("Marks "+(j+1)+" Mark: "));
System.out.println(subj[j]);
System.out.println(Mark[j]);
System.out.println("Student'-->"+toString());
System.out.println("Average Stu-->"+getAverage());
getLowScore();
public double getAverage()
if( Mark[0]==0 || Mark[1]==0 || Mark[2]==0 || Mark[3]==0 || Mark[4]==0)
finalNumericGrade=((((float)(Mark[0])) + ((float)(Mark[1])) + ((float)(Mark[2])) + ((float)(Mark[3])) + ((float)(Mark[4])))/4);
else
finalNumericGrade=((((float)(Mark[0])) + ((float)(Mark[1])) + ((float)(Mark[2])) + ((float)(Mark[3])) + ((float)(Mark[4])))/5);;
return finalNumericGrade;
private String letterGrade(){
//System.out.println(" +++ finalNumericGrade " + finalNumericGrade );
if ((finalNumericGrade >= 3.50) & (finalNumericGrade <= 4))
finalLetterGrade = "A";
else
if ((finalNumericGrade >= 2.50) & (finalNumericGrade < 3.50))
finalLetterGrade = "B";
else
if ((finalNumericGrade >= 2) & (finalNumericGrade < 2.50))
finalLetterGrade = "C";
else
if ((finalNumericGrade >= 1) & (finalNumericGrade < 2))
finalLetterGrade = "D";
else
if (finalNumericGrade == 0)
finalLetterGrade = "X";
else finalLetterGrade ="Z";
return finalLetterGrade;
/*****Java Absentee***/
public int getAbsenteeJava()
if((Mark[0]==0))
abj=abj+1;
else
abj=0;
return abj;
public void setAbsenteeJava()
System.out.println("Absent in Java-->"+abj);
/***Maths Absentee****/
public int getAbsenteeMaths()
if(Mark[1]==0)
abm=abm+1;
else
abm=0;
return abm;
public void setAbsenteeMaths()
System.out.println("Absent in Maths-->"+abm);
/****Stats Absentee---*/
public int getAbsenteeStat()
sub3="Stats";
if(Mark[2]==0)
abs=abs+1;
else
abs=0;
return abs;
public void setAbsenteeStat()
System.out.println("Absent in Stats-->"+abs);
/*****NEt Absentee****/
public int getAbsenteeNet()
sub4="Network";
if(Mark[3]==0)
abn=abn+1;
else
abn=0;
return abn;
public void setAbsenteeNet()
System.out.println("Absent in Network-->"+abn);
/*****Database Absentee****/
public int getAbsenteeData()
sub5="Database";
if(Mark[4]==0)
abd=abd+1;
else
abd=0;
return abd;
public void setAbsenteeData()
System.out.println("Absent in Database-->"+abd);
public String getLowScore(){
//Determine and return the lowest score
if(((subj[0].equals(sub1)) || (Mark[0]==0)))
sub="Java";
else if(((subj[1].equals(sub2)) || (Mark[1]==0)))
sub="Maths";
else if(((subj[2].equals(sub3)) & (Mark[2]==0)))
sub="Stats";
else if(((subj[3].equals(sub4)) || (Mark[3]==0)))
sub="Network";
else if(((subj[4].equals(sub5)) || (Mark[4]==0)))
sub="Database";
return sub;
public String toString() {
String studentStringValue="\n\nStudent " subj[0] " "+subj[1]+" "+subj[2]+" "+subj[3]+" "+subj[4]+ " Lowest Final Marks \n\n";
String nm = name[i];
studentStringValue+= nm+"\t";
if(Mark[0]==0)
studentStringValue+="" s "\t";
else
{// 232: Line: getting ERROR here
a=Mark[0];
ch = new Character(((char) ((69-a))));
studentStringValue+= Mark[0]+" "+ch+ "\t";
if(Mark[1]==0)
studentStringValue+="" s "\t";
else
b=Mark[1];
ch = new Character(((char) ((69-b))));
studentStringValue+= Mark[1]+" "+ch+ "\t";
if(Mark[2]==0)
studentStringValue+="" s "\t";
else
c=Mark[2];
ch = new Character(((char) ((69-c))));
studentStringValue+=Mark[2] +" "+ch+ "\t";
if(Mark[3]==0)
studentStringValue+="" s "\t";
else
d=Mark[3];
ch = new Character(((char) ((69-d))));
studentStringValue+= Mark[3] +" "+ch+ "\t";
if(Mark[4]==0)
studentStringValue+="" s "\t";
else
e=Mark[4];
ch = new Character(((char) ((69-e))));
studentStringValue+=Mark[4] +" "+ch+ "\t";
//studentStringValue+=" " + abs + " ";
studentStringValue+=" " sub"\t";
studentStringValue+=" " + finalNumericGrade + " \n\n";
//studentStringValue+=" Final Letter Grade is: " + finalLetterGrade +"\n";
try {
BufferedWriter out = new BufferedWriter(new FileWriter(".//Marks3.txt", true));
out.write(studentStringValue);
out.close();
} catch (IOException e) {
return studentStringValue;
}// toString
public void printName(){
System.out.print(" "+lname);
System.out.print(" "+fname);
public static void main(String[] args)
Test s = new Test();
s.inputGrades();
System.out.println("Average-->" +s.getAverage());
//System.out.println("Average-->" +s.setAverage());
s.getAbsenteeJava();
s.setAbsenteeJava();
s.getAbsenteeMaths();
s.setAbsenteeMaths();
s.getAbsenteeStat();
s.setAbsenteeStat();
s.getAbsenteeNet();
s.setAbsenteeNet();
s.getAbsenteeData();
s.setAbsenteeData();
s.getLowScore();
//System.out.println("Final Letter Grade --> " + s.letterGrade());
System.out.println(""+ s.toString()); -
Exception in thread "main" javax.mail.NoSuchProviderException: invalid prov
HI,
I am trying to read mails from my inbox i amgetting the ErrorC:\javamail>java
Readmail
Exception in thread "main" javax.mail.NoSuchProviderException: No provider for IMAP
at javax.mail.Session.getProvider(Session.java:455)
at javax.mail.Session.getStore(Session.java:530)
at javax.mail.Session.getStore(Session.java:510)
at Readmail.main(Readmail.java:24)My Code is {
String host = "hostname";
String username = "user";
String password = "password";
// Create empty properties
Properties props = new Properties();
// Get session
Session session = Session.getDefaultInstance(props,null);
// Get the store
Store store = session.getStore("IMAP");
store.connect(host, username, password);
// Get folder
Folder folder = store.getFolder("Inbox");
folder.open(Folder.READ_ONLY);
// Get directory
Message message[] = folder.getMessages();
for (int i=0, n=message.length; i<n; i++)
System.out.println(i + ": " + message.getFrom()[0]
+ "\t" + message[i].getSubject());
// Close connection
folder.close(false);
store.close();
I have also tried POP3 and MIME and SMTP
Can anyone help me Thankshi bshannon,
I am getting the same error for others but for pop3 the error is as below
Exception in thread "main" javax.mail.MessagingException: Connect failed;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:148)
at javax.mail.Service.connect(Service.java:275)
at javax.mail.Service.connect(Service.java:156)
at Readmail.main(Readmail.java:25)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:232)
at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:189)
at com.sun.mail.pop3.Protocol.<init>(Protocol.java:81)
at com.sun.mail.pop3.POP3Store.getPort(POP3Store.java:201)
at com.sun.mail.pop3.POP3Store.protocolConnect(POP3Store.java:144)
... 3 more
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