Java 1.5beta compilation help
I don't know if anyone here has tried the new(ish) java 1.5.0beta, but I can't get it to work for the life of me. If anyone knows why it still seems to compile like 1.4, or if anyone knows where I can get more help, please let me know...
Specifically, the new Generics functionality should allow me to compile:
ArrayList<String> listOfStrings = new ArrayList<String>();
instead of the old version without the "<String>". This isn't compiling with javac 1.5.0, saying that a "(" is expected (just like you'd expect if you tried compiling it with javac 1.4. My version of the compiler is definitely correct (according to javac -version, anyway).
Any ideas?
D
It's ok, I've solved it.
To compile in 1.5 mode, you need to specify "javac -source 1.5 <filename>". Seems rather roundabout, but I no longer have a problem...
D
Similar Messages
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Hi!
We implemented a small Java(FX) Property Compiler which enables you to use a powerful PropertyHint-annotation. The "compiler" is implemented as an Post-"Java Compiler"-Bytecode-Modification-Tool (using asm-4).
Here are 3 small example so you can get the idea.
First Example
public class Case1 {
@PropertyHint public String one;
public enum Two { Zero, One, Two }
@PropertyHint public Two two;
}If you compile this class with Java Compiler and the Property Compiler you get the following byte-code-equivalent (I used Java Decompiler to reflect the code):
public class Case1
public String one;
public Two two;
private SimpleObjectProperty<Two> _twoField;
private SimpleStringProperty _oneField;
@Property(writeable=true, name="two", dataSignature="Lde/chimos/property/test1/Case1$Two;", dataSignatureGeneric="", humanReadableName="")
public final ObjectProperty<Two> twoProperty()
if (this._twoField == null)
this._twoField = new SimpleObjectProperty(this, "two");
return (ObjectProperty)this._twoField;
private final Two _getTwo()
return (Two)twoProperty().getValue();
@XmlElement
public Two getTwo()
return _getTwo();
private final void _setTwo(Two value)
twoProperty().setValue(value);
public void setTwo(Two value)
_setTwo(value);
@Property(writeable=true, name="one", dataSignature="Ljava/lang/String;", dataSignatureGeneric="", humanReadableName="")
public final StringProperty oneProperty()
if (this._oneField == null)
this._oneField = new SimpleStringProperty(this, "one");
return (StringProperty)this._oneField;
private final String _getOne()
return (String)oneProperty().getValue();
@XmlElement
public String getOne()
return _getOne();
private final void _setOne(String value)
oneProperty().setValue(value);
public void setOne(String value)
_setOne(value);
public static enum Two
Zero, One, Two;
}The fields "public String one" and "public Two two" are still in there to keep the Java Compiler (representing the first pass of the compiling process) working. It is possible to configure the Property Compiler via a setting called "dummyFields".
All references to these fields (dummy fields) are replaced by getter and setter calls. As you can see in the next example.
Second Example
This is what you type and compile:
public class Main {
* @param args the command line arguments
public static void main(String[] args)
Case1 case1 = new Case1();
case1.one = "Test";
case1.two = Case1.Two.Two;
System.out.println("case1.one = "+case1.one);
System.out.println("case1.two = "+case1.two);
Case3 case3 = new Case3();
System.out.println("case3.one = "+case3.one);
case3.update();
System.out.println("case3.one = "+case3.one);
Case4 case4 = new Case4();
case4.one = Case4.One.Two;
System.out.println("case4.one = "+case4.one);
case4.one = Case4.One.Zero;
System.out.println("case4.one = "+case4.one);
Case5 case5 = new Case5();
case5.one = Case5.One.Two;
System.out.println("case5.one = "+case5.one);
}This is what you really get (reflected via Java Decompiler):
public class Main
public static void main(String[] args)
Case1 case1 = new Case1();
case1.setOne("Test");
case1.setTwo(Case1.Two.Two);
System.out.println("case1.one = " + case1.getOne());
System.out.println("case1.two = " + case1.getTwo());
Case3 case3 = new Case3();
System.out.println("case3.one = " + case3.getOne());
case3.update();
System.out.println("case3.one = " + case3.getOne());
Case4 case4 = new Case4();
case4.setOne(Case4.One.Two);
System.out.println("case4.one = " + case4.getOne());
case4.setOne(Case4.One.Zero);
System.out.println("case4.one = " + case4.getOne());
Case5 case5 = new Case5();
case5.setOne(Case5.One.Two);
System.out.println("case5.one = " + case5.getOne());
}Amazing, right?
Third Example
In case you provide a getter or setter it is used automatically:
public class Case5 {
public enum One { Zero, One, Two }
@PropertyHint public One one;
public One getOne()
System.out.println("Case5.getOne()");
if(one == One.Two)
return One.Zero;
return one;
}This is what you get (reflected via Java Decompiler):
public class Case5
public One one;
private SimpleObjectProperty<One> _oneField;
public One getOne()
System.out.println("Case5.getOne()");
if (_getOne() == One.Two)
return One.Zero;
return _getOne();
@Property(writeable=true, name="one", dataSignature="Lde/chimos/property/test1/Case5$One;", dataSignatureGeneric="", humanReadableName="")
public final ObjectProperty<One> oneProperty()
if (this._oneField == null)
this._oneField = new SimpleObjectProperty(this, "one");
return (ObjectProperty)this._oneField;
private final One _getOne()
return (One)oneProperty().getValue();
private final void _setOne(One value)
oneProperty().setValue(value);
public void setOne(One value)
_setOne(value);
public static enum One
Zero, One, Two;
Sourcecode and documentation
We published the code as LGPL. The project an more examples are available on http://code.google.com/p/java-property-compiler/source/browse/
The first draft of documentation is still work in progress (Gerrit is currently working on the documentation).
IDE integration
The Eclipse-integration is done via an ant-builder. It works but is not perfect. Apart from the fact that the configuration requires some mouse clicks, you have to manually activate the "auto,clean" trigger. We would like to implement a real builder-plugin. Can anyone help us?
We tried a Netbeans-integration via "-post-compile", etc.. But that does not work properly. If you try to debug a project which uses the Property Compiler, the post-compiled byte-code is simply ignored and you run the unprocessed bytecode. Any idea?
JavaFX-Tree Chart
There is another project called "javafx-treechart": http://code.google.com/p/javafx-treechart/wiki/TreeChart
Gerrit will write about it as soon as the documentation is online.
Regards, Niklas
Edited by: Niklas on 28.11.2011 16:23Hi all!
Thank you for your responses and comments!
Sorry for the late response. I am in Australia on vacation at the moment (just visited Brisbane and Whitsundays - and I am going to visit Sydney tomorrow :-).
@zonski:
Lombok is really a masterpiece. I had a look at the code. They use AST and (if I'm not mistaken) byte code manipulation too. I think we can learn a lot from Lombok.
The IDE integration of Lombok is kind of black magic - my personal point of view. I simply don't like those Eclipse API interceptions which are implemented in the Eclipse agent. I rather stick to standard interfaces - like a custom Eclipse-Builder, etc... (I still don't know the Netbeans-way, but I am going to figure that out).
This is one of the reasons why I decided to use the (awesome) Lombok source code as inspiration, but not to use my resources at hand to extend Lombok itself.
Further reasons:
a) We developed a different annotation philosophy (not implemented yet but we are going too).
b) I developed a small "deterministic destructor" mechanism based on byte-code manipulation and some (important) variable assignment restrictions - to keep performance up and avoid side effects. We want to provide an annotation for this mechanism.
We probably stick to byte code-manipulation. Not sure if we use AST (makes IDE integration very hard - see Jonathan Giles' comment).
@bouye:
I understand the concerns regarding "manual code tweaking", but I really hate the property boilerplate code - it results in unreadable source code. Our implementation still allows custom implementations of getter and setter in case you want to tweak your code. We extended our concept to allow even more flexibility (not implemented yet).
@Richard Bair:
I agree, developers might be confused if the know plain java and have no idea about the magic going on. But this is a matter of documentation and communication. If you know the concepts and the tools the code is easier to read.
I agree with you that Java really needs native property support. The annotation solutions are just placeholder solutions.
@Jonathan Giles:
IDE support is definitely an issue. That’s the reason why I want to stick to byte code manipulation. You can integrate the required build steps in Eclipse easily (still not sure about Netbeans). Using AST requires a lot of black magic as you can see in the Lombok source code.
Actually I had absolutely no debugging issues with our approach if we talk about Eclipse. If there is a way to hook into the Netbeans build process properly it shouldn't be a problem either. Of course the injected code needs to be crafted and tested carefully (no surprises policy).
The next version of our post-compiler will be splitted in two parts. The first part can be used within the regular build process and does a lot of modification (probably based on the ASM tree API). The second part gets called from a class loader and performs some final tweaks, e.g. dropping unnecessary fields (based on the fast ASM core API). In case the loaded class file did not pass the first part (detected while loading), it is entirely processed within the loading sequence. This should avoid surprises. The post-compiler can be restricted to specific namespaces.
Our current big commercial project is going to depend heavily on the post-compiler. We decided to provide the post-compiler as open source as we want to contribute to the Java community.
I'll keep you posted!
Niklas -
Java 2 SDK compilator for beginners
Hi to all here.
I am really sorry to disturb you all,
I am beginner in Java and I need to download Java 2 SDK compilator in order to compile my homeworks. I went lost in all the reliese EE, SE and so on I saw in Sun homepage.
Which one is the right one ?
I have Windows Vista Home edition in my computer.
Thanks for helping me.
FlavioDownload and install a Java SE 6 JDK for your Windows platform which is available here:
http://java.sun.com/javase/downloads/index.jsp
If you want some GUI Application you may choose the version containing NetBeans, if you only want the compiler and runtime environment install the first option (JDK 6 Update 4).
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Is there a Java utility class to help with data management in a desktop UI?
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In the servlet create an Arraylist and in th efor
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>
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AS -
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Hi,
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I want all the information or errors of java code
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How to get the java syntax errors?Redirect the STDOUT/STDERR from the the JAVA/JAVAC command to a file is one way...
For instance at the commmand line:
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Popups work in preview but not in compiled help
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I am using Robohelp 8 and have been having problems displaying popups in my compiled help. When I view a topic that contains popup links in the WYSIWYG, I can preview the popup topics with no problem, but when I compile and click on a link that contains a popup, nothing happens. I get a warning in the bottom of the browser window that says "Error on page" with no further details. Is there a setting somewhere that I need to adjust. I have never had this problem before.
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AdrienneHi there
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Getting java code to compile on unix/linux
I have been using borland JBuilder to run and compile my java code. Recently i tried moving the code to a linux machine in which i have downloaded the JDK to. My classes only use standard java classes with the exception of a jbcl.jar file which has a class that one of my classes relies on. It turns out when i try to run my class i get error messages because it cant find the jar file. Where should I put this jar file? by the way in my class i use the statement: where jbcl.layout is the class i need.
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at
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at
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I think you are not creating that ear correctly.
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Hiding topics in compiled help
Is there a way to hide a topic so that it is included in the
compiled help but can only be found by searching with a specific
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example, create a small icon the same colour as the background of a
page so that it cannot be seen. Make that a hyperlink to the topic.
I accept it is a kludge but it is only for a small number of people
in the know as to where that graphic is, it would work. -
there is no rt.jar in java lib could anyone help me downloading it ,or tell me where is this rt.jar, there is no rt.jar in java lib could anyone help me downloading it ,or tell me where is this rt.jar
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Hello Sorry for the inconvenience, but I have a problem in Java I can not open files, audio chat, which type of jnlp after the last update of the Java 2012-004
Please help me in solving this problem.Make sure Java is enable in your browser's security settings.
Open Java Preferences (in Utilities folder)
Make sure Web-start applications are enabled.
Drag Java 32-bit to the top of the list.
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Simple Java created with compilation errors.
Hi,
While I am using Oracle for many years (currently 9.2.0.6.0) I am completely new to Java in the database.
I found a very simple example to get started (please see SQL*Plus dump below) ... but I get a compilation error. Can anyone tell what I am doing wrong?
SQL> CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED Fibonacci AS
2 public class Fibonacci
3 {
4 public static int fib (int n)
5 {
6 if (n == 1 || n == 2)
7 return 1;
8 else
9 return fib(n - 1) + fib(n - 2);
10 }
11 }
12 /
Warning: Java created with compilation errors.
SQL> show errors java source Fibonacci
No errors.
SQL>
(It must be a simple thing, the example I found seems correct, but what about grants, settings etc.)
Thanks in advance,
StefanStefan,
I cannot see anything in your code that would cause a compilation error. However, according to the example in the "Oracle 9i SQL Reference", it looks like you need to enclose the name in double quotes, as in:
CREATE OR REPLACE AND COMPILE JAVA SOURCE NAMED "Fibonacci" AS ...Alternatively (and this is the way I do it), you could compile the class outside of the database, and load the compiled class file. Just create a file called "Fibonacci.java" (that contains your java code), compile it, and then use the "loadjava" tool to load the "Fibonacci.class" file into the database. Please refer to the Oracle 9i Java Developer's Guide for more details.
Good Luck,
Avi. -
Java.lang.NoSuchMethod: main - Help pls
This is the code i got off a book but it seems like it's not working. I got an error which says 'java.lang.NoSuchMethod: main' Help pls...
import java.io.*;
import java.util.*;
class PostfixInterpreter {
private String postfixString, outputString;
private boolean isOperator(char c) {
return (c == '+' || c == '-' || c == '*' || c == '/' || c == '^' );
private boolean isSpace(char c) {
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Stack evalStack= new Stack();
double leftOperand, rightOperand;
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String token = parser.nextToken();
c = token.charAt(0);
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leftOperand = ((Double)evalStack.pop()).doubleValue();
switch (c) {
case'+': evalStack.push(new Double(leftOperand+rightOperand));
break;
case'-': evalStack.push(new Double(leftOperand-rightOperand));
break;
case'*': evalStack.push(new Double(leftOperand*rightOperand));
break;
case'/': evalStack.push(new Double(leftOperand/rightOperand));
break;
case'^': evalStack.push(new Double(Math.exp(Math.log(leftOperand)*rightOperand)));
break;
default:
break;
}//end of switch
}else if((token.length() == 1)&& isSpace(c)){
}else {
evalStack.push(Double.valueOf(token));
}//end if
}//end while
// remove final result from stack and output it
output("value of postfix expression = " + evalStack.pop());
}//end interpretPostfix
private void output(String input){
postfixString = input;
}//end setInput
public String getOutput(){
return outputString;
}//end getOutput
}//end class PostfixInterpreter
/*Stack class*/
class Stack {
private int count;
private int capacity;
private int capacityIncrement;
private Object[] itemArray;
//the following defines a no-arg constrcutor for Stack objects
public Stack() {
count = 0;
capacity = 100;
capacityIncrement = 5;
itemArray = new Object[capacity];
public boolean empty() {
return (count ==0);
public void push(Object X) {
//if the itemArray does not have enough capacity
//expend the itemArray by the capacity increment
if(count == capacity) {
capacity += capacityIncrement;
Object[] tempArray = new Object[capacity];
for (int i=0; i<count;i++){
tempArray[i] = itemArray;
itemArray=tempArray;
//insert the new item X at the end of the current item sequence
//and increase the stack's count by one
itemArray[count++]=X;
public Object pop() {
if(count==0){
return null;
}else{
return itemArray[--count];
}//end of pop()
public Object peek() {
if (count == 0){
return null;
}else{
return itemArray[count-1];
}//end peek()First, when posting code in the future, use the code /code tags. Just highlight the code and click the code. button.
The error probably occurred when you tried to launch the class as an application by entering "java PostfixInterpreter" The java application launcher looks for a method in the PostfixInterpreter class whose signature is exactly public static void main(String[] args)(except 'args' can be any legal variable name). Since your PostfixInterpreter class doesn't have this method, you get the error. If you want this class to run, you have to include the method and code inside the method that runs the application.
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