JSP :: Not Able To Compile TagHandler Class
May 15, 2014
This is my TagHandler class
package foo;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import java.io.IOException;
[Code] ....
But it is not able to find all the classes referenced in the code. While compiling I am mentioning the servlet-api.jar
My compilation statement is this
C:Tomcat 7.0webappsSimpleCustomTagsWEB-INF>javac -cp "C:Tomcat 7.0libservlet-api.jar;.;" classesfoo*.java
It says package javax.servlet.jsp.JspException and javax.servlet.jsp.tagext.SimpleTagSupport does not exist.
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Jul 5, 2014
i am trying to work through the Murach's Java Servlets and JSP book. I am stuck however. I keep getting a HTTP Status 500 - Unable to compile class for JSP.
I am using Eclipse Kepler, JDK 1.7, and Tomcat v7.0 server.
Its a fairly simple program that takes in user information, first name, last name, and an email and processes the information, saving the data to a text file.
------------------------------------------------
I have two Java classes: User and UserIO
-------------------------------------------------
//User.java
package business;
public class User {
private String firstName;
private String lastName;
private String emailAddress;
public User(String firstName, String lastName, String emailAddress){
[code]....
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Jan 17, 2015
The MyCircle class won't compile.
QUESTION: A class called MyCircle, which models a circle with a center (x, y) and a radius, is designed as shown in the class diagram. The MyCircle class uses an instance of MyPoint class (created in the previous exercise) as its center.
The class contains:
-Two private instance variables: center (an instance of MyPoint) and radius (int).
-A constructor that constructs a circle with the given center's (x, y) and radius.
-An overloaded constructor that constructs a MyCircle given a MyPoint instance as center, and radius.
-Various getters and setters.
-A toString() method that returns a string description of this instance in the format "Circle @ (x, y) radius=r".
-A getArea() method that returns the area of the circle in double.
Write the MyCircle class. Also write a test program (called TestMyCircle) to test all the methods defined in the class.
My code:
public class MyCircle{
private MyPoint center;
private int radius=1;
public MyCircle(int x, int y, int radius){
this.x = x;
this.y = y;
this.radius = radius;
[code]....
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Mar 8, 2015
below is my code and this exception was thrown in another page so I created a new page and only imported just a single package still its throwing an exception? Any reasons why?
<%@page contentType="text/html" pageEncoding="UTF-8" %>
<%@page import="java.sql.*;" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
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Jul 29, 2013
class SubB{
public void foo(){
System.out.println(" x");
}
}
public class X extends SubB {
public void foo() throws RuntimeException{
super.foo();
if(true) throw new RuntimeException();
System.out.println(" B");
}
public static void main(String [] args){
new X().foo();
}
}
Why the foo method of class X is not throwing a compile error because according to the override rule, if the superclass method has not declared exception, the subclass method can't declare a new exception...
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May 6, 2014
I'm doing a project and my code won't compile.
import javax.swing.*;
import java.awt.event.*;
public class BookStore extends JFrame{
private JPanel panel;
private JLabel question; //This will be where the question is.
private JTextField NumofBooks; //this is where the user will enter the number of books
private JButton OKButton,ClearButton,ExitButton; //Will give the user the points, cancel the points, and exit
private final int WINDOW_WIDTH = 310; //Need to make it visible
private final int WINDOW_HEIGHT = 100;
[code]....
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Mar 5, 2015
i would like to ask what does exactly do the command mvn compile. What is happening with the code, when i write this command? And why is it necessary for running the code?
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Apr 1, 2015
I created Myproject folder. Inside I have 3 folders:
/lib
/src
/bin
Inside src there is a .java file:
public class hello_world{
public static void main(String[] args){
System.out.println("Hi, from hello_world");
seba.st.hello_world_package test1 = new seba.st.hello_world_package();
test1.packFunc();
}
}
inside lib is a packEx.jar file which I created from this .java file:
package seba.st;
public class hello_world_package{
public void packFunc(){
System.out.println("hi from pack_func!");
}
}
I am trying to run this program from terminal with this command
javac -d bin -sourcepath src -cp lib/packEx.jar src/hello_world.java
and I get this error:
src/hello_world.java:11: error: cannot find symbol
test1.packFunc();
^
symbol: method packFunc()
location: variable test1 of type hello_world_package
1 error
What am I doing wrong ? How can I compile and run this program from terminal?
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Nov 20, 2014
if(false){}
but this is not
for(;false;){}
both will in theory never go in more interestingly this will compile
for(;false == false;){}
To me it seems like this is a parsing issue that could have been solved by the people who originally wrote the parser but they made a decision that there must be a relational operator in the condition declaration.
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Nov 15, 2014
import java.util.Calendar;
import java.util.GregorianCalendar;
public class CalendarCalc {
public CalendarCalc (){}
private static void printCalendarMonthYear (int month, int year)
[Code] .....
IDE is telling me this:
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method printCalendarMonthYear(int, int) is undefined for the type CalendarDisplay
at CalendarDisplay.main(CalendarDisplay.java:46)
Btw, I have a main class. This is just the class responsible for doing calculations.
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Mar 19, 2014
I am making a simple mod/hack for a game programmed in Java. I located the .class file I needed and deobfuscated it and then decompiled it. After that I went in and made a very simple adjustment that I wanted to make. Unfortunately I can across a problem when trying to compile the file! The file won't compile because there are errors. The reason there are errors is because this is just one file out of an entire game. I know this my seem weird, but is there some way I can compile the file with the errors.
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Feb 9, 2015
I am a C# developer but need to do some java development. The code produces the following error.
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
...
HashMap<String, String > myMap = new HashMap<String, String>(){{
put("a","b");
}};
myMap.put("foo", "bar");
myMap.put("Sna", "foo");
...
Generates this error
C:/FSC/apache-tomcat-6.0.41/webapps/aspen/temp/x2_8656248460570782763/x2_5214718769032742331/StudentExport.java:47: error: <identifier> expected
myMap.put("foo", "bar");
^
What am I missing?
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Jul 16, 2009
"Because X is a compile time constant, the compiler will Y"... But what exactly is a compile time constant? And how can we determine whether something is treated as such?Obviously, a compile time constant is a constant value that is known at compile time... ... Literals are, by definition, compile time constants -- as they are constants, known at compile time.
But the definition of a compile time constant is a bit more complex. To start, let's examine section 15.28 of the Java language specification.A compile-time constant expression is an expression denoting a value of primitive type or a String that is composed using only the following:
Literals of primitive type and literals of type String Casts to primitive types and casts to type StringThe unary operators +, -, ~, and ! (but not ++ or --)The multiplicative operators *, /, and %The additive operators + and - The shift operators <<, >>, and >>>The relational operators <, <=, >, and >= (but not instanceof)The equality operators == and !=The bitwise and logical operators &, ^, and |The conditional-and operator && and the conditional-or operator ||The ternary conditional operator ? : Simple names that refer to final variables whose initializers are constant expressions Qualified names of the form TypeName . Identifier that refer to final variables whose initializers are constant expressions
This is the full definition of a compile time constant. And as you can see, it contains more than just literals. In fact, literals are merely the first bullet point on the list. Also, note that a compile time constant can apply to any literal that is of primative or String type.The next few bullet points are the operations that can be applied to a constant at compile time. This list is actually pretty long, as it is possible to apply most of the operations at compile time. It may actually be easier to remember what can't be apply at compile time -- pre and post increment and decrement, instanceof operator, or any method calls, are not on the list.
The last few bullets are the most interesting. It is possible to use a variable in the expression -- provided that the variable is a compile time constant variable. So... what is a constant variable? Going back to the JLS (section 4.12.4 to be exact)..4.12.4 final Variables.A variable can be declared final. A final variable may only be assigned to once. It is a compile time error if a final variable is assigned to unless it is definitely unassigned (§16) immediately prior to the assignment.
We call a variable, of primitive type or type String, that is final and initialized with a compile-time constant expression (§15.28) a constant variable. Whether a variable is a constant variable or not may have implications with respect to class initialization (§12.4.1), binary compatibility (§13.1, §13.4.9) and definite assignment (§16).The last part of the definition is the relevant part (I still find it amazing that this is that well hidden in the specification). To be a variable that is a compile time constant, the variable needs to be...declared as finalhave a primative or String typeinitialized (on the same line as the declaration)assigned to a compile time constant expression.
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Oct 10, 2014
I'v tried everything, i'v tried to create new path in enviornment variables i tried adding this path -->(C:Program FilesJavajdk1.8.0_20bin) to the end of the default path doesnt work i uninstalled and reinstalled and did the same thing over and it didnt work am i editing the files wrong ? what i do is write the hello world program in eclipse to make sure there arent any errors then copy and paste in note pad++ save it as a .java file and it doesnt work i tried save it in regular notepad as .java laso and it doesnt work iv done every thing i could possibly find on youtube is this stuff outdated ? is there a new way? this one one of the errors ill get
C:javat>javac helloworld.java
helloworld.java:1: error: '{' exp
public class helloworld.java {
^
And this is the code for that file im trying to compile
public class helloworld.java {
public static void main (String args[]){
System.out.println("hello world");
}
}
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Apr 14, 2014
I have set the CLASSPATH
(C:Program FilesApache-Tomcat-7apache-tomcat-7.0.53libservlet-api.jar,
PATH(C:Program FilesJavajdk1.7.0_51in)
and JAVA_HOME
(C:Program FilesJavajdk1.7.0_51) environmental variable on my windows XP.
I installed tomcat server and its running fine. I made my first servlet(DemoServlet.java) in
C:Program FilesApache-Tomcat-7apache-tomcat-7.0.53webappsDEMOWEB-INFclasses folder.
I made the XML file (web.xml) in C:Program FilesApache-Tomcat-7apache-tomcat-7.0.53webappsDEMOWEB-INF folder. In command prompt I went to the classes folder
(C:Program FilesApache-Tomcat-7apache-tomcat-7.0.53webappsDEMOWEB-INFclasses).
And tried to compile my servlet(javac DemoServlet.java) but it is showing file not found error. I am new to servlets.
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May 1, 2011
I am totally new to programming in every way, shape or form, and I'm working my way through the Head First Java book (2nd ed). I have just finished copying the code for the initial BeatBox app, the one starting on page 420. When I try to compile it, I get these errors:
BeatBox.java:36: cannot find symbol
symbol : constructor Box(int)
location: class Box
Box buttonBox = new Box(BoxLayout.Y_AXIS);
^
BeatBox.java:40: cannot find symbol
symbol : method add(javax.swing.JButton)
location: class Box
buttonBox.add(start);
[code]....
I doubt that this is relevant, but I'm running Mac OS X, coding in TextWrangler and compiling with Terminal. Java version is 1.6.0_24.
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Jul 23, 2014
programming altogether and after almost reaching half way in the 'Head first java' book I decided to try and apply some of what I've learnt so far and write my first 'Object orientated' program. As this is pretty much the first program I've ever written, I decided to write a program to ask for two integers and add them both together and then present them to the user (the goal eventually being a basic fully working command line calculator with +,-,* and /. I'm expecting many compile errors but not the following errors below.
I have three .java files contained within a folder and after trying to figure out how to compile all three files (as they use one another) all at once, I came across this ---> javac *.java
so I typed this in the command line whilst in the directory containing the three files assuming *.java is the best approach and then I receive the following errors:
inputOutput.java:10: error: cannot find symb
c.addition() = intIn.nextInteger();
^
symbol: variable c
location: class inputOutput
[Code].....
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Sep 24, 2014
import java.util.*;
import java.lang.*;
class Bank {
String name;
float acc_no,balance;
void accept(String str, float no, float bal)
[code]....
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Sep 20, 2014
error: cannot find symbol Place
I'm trying to use the javac -sourcepath option to compile superclasses without explicitly naming them. I've been looking at examples, other posts, and trying variations for a while without success.
I have:
package ActorBase0.classes;
public class Bridge extends Place {
......
Place is also in package ActorBase0.classes and the source files are in the same directory .... ActorBase0sources
javac -d ActorBase0classes -sourcepath ActorBase0sources -cp . -Xlint:unchecked -verbose ActorBase0sourcesBridge.java
is one of the variations that gets error: cannot find symbol Place.
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Jan 26, 2014
How do I set the class path, the path, compile and run java programs using jdk and jcreator?
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Jan 22, 2014
I made just a simple hello world class and i can not seam to make eclipse run it in any way not even the console.
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Jul 1, 2014
I'm writing basically my first program for school. I've written small ones, following instructions, but this is the most vague. I'm having issues. I can't figure out what the error means. I'm not done with the code, but I think the ArrayList is throwing me off. I'm trying to gather user input and sum the total. Here's the code:
package graduationplanner;
import java.util.ArrayList;
import java.util.Scanner;
import java.lang.Double;
public class GraduationPlanner {
public static void main(String[] args) {
[Code] ....
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Sep 18, 2014
I am having a pretty bad time with this y goto to classes one form labels with a certain image and the other for another images of the same kind but what i have to do is to use a third class in which both classes have to compile and appear in the right place. Ineed an example or something because i don't get it what to do?
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Feb 3, 2015
I keep getting the error Admit.java:10 cannot find symbol
import java.util.*;
public class Admit {
public static void main(String[] args) {
sayIntro();
Scanner console = new Scanner(System.in);
System.out.println("Information for applicant #1:");
getScore(console);
getGPA(console);
[Code] ....
The compiler then reads:
Admit.java:10: error: cannot find symbol
score1(ACTScore, SATScore, GPAScore);
^
symbol: variable ACTScore
location: class Admit
Admit.java:10: error: cannot find symbol
[Code] .....
10 errors
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Apr 18, 2014
On my code, I am getting errors to put ; after the public void's. I'm not sure where the problem is seeing as my textbook pretty much had the same code that I just transferred the different data to....
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class MoveIt extends Applet implements ActionListener {
private Image cup;
private Panel keypad;
[Code] ....
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Aug 26, 2014
I was wondering what happens to the API packages I've imported at compile time. Are they compiled to classes and placed In the same file as the class containing the Import command ?
The reason I'm asking Is because I've noticed the src.zip file Is not In the JRE and since the JRE Is all that's needed to run an app , I'd like to understand what the import command does.
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