Error adding a method to a class

Hi, im new to Java and learning how to program through a book. Im working on adding a method to a class but I am getting an error when compiling and im not sure what i need to do to the method to allow it to be read. Any help is much appreciated :o) Here is the problem. im using eclipse to compile. The class is saved as AddMeth.java. I ha...

Java reflection for generics

I am using Java Reflection to expose methods in custom eclipse tool. I am writing method getReturnType which accepts java.lang.reflect.Method as input and returns object of Class<?> private static Class<?> getReturnType(Method method) { Type type = ((ParameterizedType)method.getGenericRet urnType()).getRawType(); return get...

NoClassDefFoundError in referencing Java Application project from Java Servlet Project

i have a java application 'JA' and a java serverlet project 'JS'. I have to call classes present in JA from JS. So, i referenced JA in JS by right click project -> deployment assembly -> add -> project and have referenced JA Now i am able to import the class files in the JS. But when i am trying to instantiate JA in JS then it is showi...

Adding method causes Compilation Error C# ASP

I am trying to create a page with asp , but when i create a button and add a method to it a compilation error occurs, when i remove the method from the button it work fine i tried these steps tried delete page, and redo it from from beginning find the error CS1061 online 3.adding method to button with different methods i am exhausted try...

Java Error Catching Issue

I have a try/catch thing set up where it will catch all exceptions and then display the error. Here is my code: try { //CODE THAT COULD ERROR HERE } catch (final Exception e) { System.err.println("Unexpected error: " + e.getCause().getMessage()); How do I make this message display the class that error-ed and the line that caused this? T...

Java custom annotation that injects another object

I am trying to learn how to write custom annotations in Java. For learning purposes, I decided to try to create an annotation that make a field available for a class using the annotation, ie: injection but not necessary as a singleton to keep it a bit more simple ( I think ), but that is welcome as well. =================================...

Passing Class arguments through RMI

I'm supposed to invoke a method requiring a Class argument on a remote object through RMI. I have to admit I'm not very familiar with RMI or CORBA. The target method interface implemented by the remote object is: public > > void doSomething(String str, Class enumClazz); When I pass a class as argument in the RMI call, I get this exceptio...

Issue while installing HIVE on HADOOP cluster

I installed hadoop few days Hadoop. It works fine with PIG. I followed the official guide ( https://cwiki.apache.org/confluence/disp lay/Hive/GettingStarted#GettingStarted-I nstallationandConfiguration ) but I have this error below : $ hive Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/thrift/TException at java.lang...

How to run code with third party jar file?

I am trying to do something really simple but I don't know how to do it. I have a third party jar file which has the class definition. I have a class with the main method. The main class uses a class in the jar file. I compiled with this command option. There was no error complaint. javac -classpath party.jar mymain.java When I tried t...

Executing specific CMD commands from Java Code

I have a .java classfile with a main method which produces a file "output.txt". I want to write a program in Java which compiles and runs it, so that the file "output.txt", produced by given Java class, is outputted to a specified folder. How can this be done? I can compile and run it, but I couldn't make something like a command in Java...

Java DOM: Error in Evaluate method; adding element at the specific location

I'm trying to add an element (javascript) using DOM at the specific location (After the div tag where id="123") of an XHTML file, which I'm doing with getElementById(). So for locating the position of the element I have used two approaches. 1: Without using XPath (Which I have commented in my code) 2: With XPath (After suggestions in the...

IDEA JetBrains IntelliJ - Compile error on 'make' but fine when compiled using Maven and no errors reported by IntelliJ in the class file

So I have a maven module (module-A) in IntelliJ. I recently moved some classes from it into another new maven module (module-B) and added a dependency to it. Once I had done this I also modified the signature of a method of one of the moved classes (now in module-B). I re-imported the poms so that IntelliJ would pick up the dependency cha...

Error: Could not find or load main class

I am having trouble compiling and running my Java code, intended to allow me to interface Java with a shared object for Vensim, a simulation modeling package. The following code compiles without error: javac -d . -cp ./apache-log4j-1.2.16/log4j-1.2.16.jar:. /vensim.jar SpatialModel.java VensimHelper.java VensimException.java VensimContextR...

What Is The Reason For The Lein Cyclic Dependency Error When I build uberwar?

Building ring server-headless works -- lein ring server-headless -- but when I try to build the war or uberwar I get the following error, and cannot figure out why this is happening. No namespaces to :aot compile listed in project.clj. Exception in thread "main" java.lang.ExceptionInInitializerError, compiling:(ring/util/servlet.clj:62)...

Compile error during compilation of my simple Java file

So here's the simple program: class String { public static void main(String[] args) { System.out.println("stre"); The following comes out during compilation at command prompt: c:\Java> java String Error: Main method not found in class String, please define the main method as: public static void main(String[] args) It wasn't working for...

java.security.AccessControlException: Access denied (java.lang.RuntimePermission preferences)

I'm trying to run an Java agent from the console of the server and I get this Exception: Agent Manager: Agent printing: WARN AppLogger.java:246 initialize() Could not find a log4j.properties resource! Defaulting to app.log output. Agent Manager: Agent error: Exception in thread "AgentThread: FTPBB" Agent Manager: Agent error: java.lang...

Problem with Java: Could not create java virtual machine

Admittedly I am... Brand new to Java, and am working on learning the basics etc. But for now, I just want to get it working. I recently uninstalled Java 6 to replace it with Java 7. The installation seemed fine, everything looked in order. Except I tried running a Java based exe and I keep getting the error message "Could not create...

Accessing a property in a class method?

I think the question is self explanatory. If I declare a property of a class, I don't seem to able to access that property within a class method. Is there any way to do this? The conventional method would usually be: self.[property] But when I call it within a class method, the compiler hands me a syntax error.

NullPointerException when creating SpecificDatumWriter

While learning Apache Avro by Tom White's book, Hadoop: The Definitive Guide, I got an error. The example has 3 steps: Create an Avro schema file ( Pair.avsc {"type": "record", "name": "Pair", "doc": "A pair of strings.", "fields": [ {"name": "left", "type": "string"}, {"name": "right", "type": "string"} ] } Compile the schema file to cre...

How to change iReport font as parameter

i have application that generate report with custom font style, like font family, color,size and style(bold,italic,underline). And i use all font-family from Windows System. I try to use parameter in .jrxml file. Like this : Code: And in the text : Code: ... ... When i preview in iReport, it log error : Code: Error filling print... Font '...

Message.java:6: error: cannot find symbol

Joined: Aug 20, 2012 Posts: 10 [Post New]posted Today 10:56:29 Quote Edit I am doing practice in core java. I have set java path=C:\Program Files\Java\jdk1.7.0_03 in; CLASSPATH=C:\Program Files\Java\jdk1.7.0_03 in; JAVA_HOME=C:\Program Files\Java\jdk1.7.0_03 And write tow simple classes.. When I compiled Home1.java , it is not giving any...

Unable to switch activity

I tried to switch activities with this code: Intent i = new Intent(this, RegisterActivity.class); startActivity(i); then I got error which said that I need to add the new class to the manifest, although I remember doing it without changing the manifest(in netbeans now I'm using eclipse). After adding the class to the manifest...

Google Maps works fine on Android but I still get an error "Could not find class 'maps.i.k', referenced from method maps.z.ag.a"

I got Google Maps Android API v2 to work perfectly on my Android Application by downloading the library, adding it to workspace, then referencing it as a library. But I still get this error as soon as the activity containing the Map Fragment starts Could not find class 'maps.i.k', referenced from method maps.z.ag.a By the way I'm using su...

Dealing with or casting an object returned from method.invoke() when using reflection

Using Java, I have a method which I'm calling with method.invoke that returns a string. Method.invoke returns an object though which can't be cast to String. How am I supposed to use the Object as a string?? In the docs on reflection it shows the following: Object o = m.invoke(t, new Locale(args[1], args[2], args[3])); out.format("%s() re...

Why does my .jar file raise exceptions even if my program runs without exceptions in Eclipse?

I am new to Java and learning how to export applications to .jar files. I made a simple Java application in Eclipse with a few classes based on the tutorial from this website. http://eclipsetutorial.sourceforge.net/t otalbeginner.html When I run my application via Run -> Run in Eclipse, my application runs without exceptions. However, whe...

Assign variable in Java while-loop conditional?

I have a method that does a lot of checking and computation and returns a custom class, returnMessage. returnMessage has 2 booleans and a String. What I want to do is run this method in a while loop from my main class and have access to the returnMessage object after the while loop terminates for the last time. In php this would be a case...

Strange LinkError in Android JNI

In my project, I have a wrapper class named PlayerCluster.java , which loads the native lib, and provides native functions. If I changed the class name ( PlayerCluster.java ) or its package, I get java.lang.UnsatisfiedLinkError when native function is invoked. It is very strange why I get this error when I rename the class name? Is there...

how to access a non getter/setter method of a java bean

I have an xhtml page that gets values from a java bean: <h:dataTable value="${myBean.getAccounts}" var="account"> <h:column> <f:facet name="header">Account ID</f:facet> #{account.id} </h:column> <h:column> <f:facet name="header">Account Name</f:facet> #{account.name} </h:column>...

How do I write a portlet without any external view component

I'm trying to write a little piece of code to show in a portlet for Liferay the name of the user logged. My problem, a part of a programming problem, is that I don't understand how exactly is the connection between a java class and the view.jsp file. I know and I'm able to show the user name and photo just with the view.jsp file, but I'm...

Cannot find symbol - attempting to use JTextArea in different method

I am trying to make a method that sets the text of one of my JTextArea(taDisplay1). Everytime I attempt to put the code in to set text(taDisplay1.setText(" ");) the taDisplay1 part of the code is underlined red. The error message is that it cannot find symbol. My code is as follows - I am getting the error message in the clear() method im...

Android and slf4j : "java.lang.NoClassDefFoundError: org.slf4j.LoggerFactory"

Two days ago, when my android project in eclipse still worked, I added "android SDK 4.0.3" to my SDKs (in addition to android SDK 2.1). From that moment on, I have a trouble with slf4j-android library; here's the exception: Uncaught handler: thread main exiting due to uncaught exception java.lang.ExceptionInInitializerError at java.lan...

Sending request to HttpUrlConnection: Status 405 error method not allowed

Hi , My web application is deployed on my machine . I can access thru Url and access the API's . But when I am trying to access the API thru Java code,HTTP 405 Status Error: Method not Allowed comes up. The request will be in this form: abc XYZ url : http://127.0.1.11:5555/IDXWeb/TestServic e.htm My java code is like this : package gepoc...

What are Class methods in Python for?

I'm teaching myself Python and my most recent lesson was that Python is not Java , and so I've just spent a while turning all my Class methods into functions. I now realise that I don't need to use Class methods for what I would done with static methods in Java, but now I'm not sure when I would use them. All the advice I can find about...

Java error "Value of local variable is not used"

I am really new to java (started learning 2 days ago). Sorry if this is a stupid question. I am trying to learn how to use rt.exec & similar methods so I tried to make a very simple program which runs calc.exe. This is the code: public class main { try { Runtime rt = Runtime.getRuntime() ; Process p = rt.exec("calc.exe") ; catch(Excep...

Error: Main method not found! Please help!

Main Assignment: Write a class named Rectangle to represent rectangles. The data fields are width, height, and color. Use double for width and height, and String for color. Suppose that all the rectangles are the same color. You need to provide the accessor methods for the properties and a findArea() method for computing the area of the...

Error with negative numbers in TextField

This is my first time asking here so if you need further information than I'll provide, just ask me. I've been learning Java for a few weeks now, and I finally decided to try and make my own program, it's the first one so the code will be all messy. It's basically a calculator for a game called Pangya, as I didn't know what else to do. M...

When is java main method called?

I have a class(1) having some constructors(arg and no args). In another class(2) an object of Class 1 is created using new constructor(). So will main method get called in this case? Ideally when is main method called in any class?...

java.lang.NoClassDefFoundError in command prompt

I am getting below exception when I try to run class file from command prompt,the same I run in eclipse,there I don't get any error Trying to run from the same folder Exception in thread "main" java.lang.NoClassDefFoundError: testClient (wrong nam e: com/mindcraft/queryExecutor/actionclass/ testClient) at java.lang.ClassLoader.defineCla...

Java mysql connection fails in second class

I have a java class which works fine ( I mean mysql connection to sql is success) But in the same package, I have another class. from where I am trying to create object of connection and then intend to use connection for various purposes. Here is the class which works fine (I changed function name from public static void main(String[] arg...

Обнаружение ошибки в коде - Java SE (J2SE)

Здравствуйте! Я в java новичок и мне нужна помощь с исправлением ошибки! Посмотрите, пожалуйста загруженный файл....может быть вы увидите то чего я не вижу, очень нужно чтоб заработала..........спасибо большое заранее) У меня версия NetBeans 7.2.1, jdk 1.7) Ошибка такая: java.lang.VerifyError: (class: ATMGUI, method: initOutComponents sig...