Ahead of time compilation of core classes

Hi,
I am currently investigating precompiling the core class libraries to native for the SUN JDK. My purpose is that 20 or so Mozillas would run on the same system, each starting a JVM, but I would like to have a single copy of the core classes loaded system-wide.
How far did Kaffe get into integrating with GCJ, or what other solutions might you think of? How hard would it be to integrate GCJ generated code into the SUN JVM? Other compilers? Other ideas?
Thanks a lot,
Philippe Laporte

Hi,
The idea is that the OS loads the text section of the JVM executable only once for all JVM instances. I would like the same for the core classes, IE those that are available prior to runtime.
Multiple Mozillas are needed because they have different X displays.
Thanks a lot

Similar Messages

Selective Ahead of Time Compilation using Annotations

I'm writing a music composition application.
Only once compiled by the JIT, does code run at the speed I need to playback and highlight notes as they are played. That is, rendering takes 3 ms and painting takes 1ms. The first few dozen iterations, rendering takes 22 ms and painting 6 ms.
Interesting, the Hotspot VM has the JVMSPI_IsPrecompilationTarget available for embedded systems.
Why can't SUN create an annotation to precompile, Ahead-of-Time (AOT), certain methods and all the code called up its object chain? It could be done after class loading and before execution or, an alternate annotation could request that the VM run a low priority thread to compile it. Perhaps with a order priority number. For my application, users often edit scores while CPU cycles sit idle. Ideally, developpers could interact programmatically, receiving a listener event when compilation is done. For my app, if a user presses play and compilation isn't done, the developper could inform the user "preparing for play" and increase the thread priority or at least wait for the "compilation done" event before proceeding. I don't know why SUN hasn't added this to the Java language and VM reference implementation yet. It would make GCJ and Excelsior JET redundant.
The garbage collector is very well behaved at its low priority and because I use pools of permanent objects, reuse as much as possible. ( http://java.sys-con.com/read/37613.htm )
-XX:CompileThreshold=# is useless to me.
Unfortunately, Sun's Java Real Time environment is not available for Mac OS X.

connections. The VM code (text) is loaded only once in
mem by the OS. So would the precompiled classes,
instead of going into the heap of every VM or
something.Code implemented as native methods will also be in a shared library and will be shared among all VM instances that use that particular shared library implementation. Lots of the classes in the Java 2 Platform already have some/most/all of their implementation in the form of native methods.
There's no real concept of shared objects for class files, though. In fact a class file, once compiled to machine code by the JIT, may not even result in the same machine code in more than one running VM. The VM needs to work with bytecode for class definitions in order to support class loaders, serialization, JIT compilation, class verification, and maybe other things too.
I don't think the memory savings would really be that much. Java bytecode is pretty compact and classes are only loaded on-demand anyway.

Error compiling the BPEL classes while configuring custom approval process

Hi,
I get the below error, but unable to fix this. Any one who did face this issue please share your thoughts to overcome this.
Error(45,34): Failed to compile bpel generated classes.
failure to compile the generated BPEL classes for BPEL process "ApprovalProcess" of composite "default/SelfRegistrationApproval!1.0"
The class path setting is incorrect.
Ensure that the class path is set correctly. If this happens on the server side, verify that the custom classes or jars which this BPEL process is depending on are deployed correctly. Also verify that the run time is using the same release/version.
Thanks,
Bhaskar

You need to keep all the custom jars at three places :
1) Soa ext , and make sao extension jar by running ant
2) Bpel classpath
3) in your project as an external referrence

How do you compile Flex-dependent classes with ASC?

Hi,
I've been trying unsuccessfully for most of the evening to compile a .as file that relies on mx.collections.ListCollectionView using asc. I figured I could just import the Flex framework SWCs from the command line with asc, but asc doesn't seem to respect SWCs - it only seems to respect .abc files.
So, I've spent most of my time trying to compile the Flex framework into a single .abc file that I can import whenever I want to compile a class that relies on Flex. I figured I could make a base .as file with include statements for all of the Flex .as files (copying the approach I saw for files like builtin.as) and compile that, but all I seem to get are compiler errors - mostly "[Compiler] Error #1181: Forward reference to base class (base class name)."
I have a feeling I'm doing this completely the wrong way. I'd very much appreciate any assistance that anybody can offer me.
Thanks,
- max

<div class=Section1> color:#1F497D'>I use MXMLC to compile my .as file projects.<o:p></o:p> color:#1F497D'><o:p> </o:p> color:#1F497D'>Alex Harui<o:p></o:p> color:#1F497D'>Flex SDK Developer<o:p></o:p> color:#1F497D'><a href="http://www.adobe.com/">Adobe Systems Inc.</a><o:p></o:p> color:#1F497D'>Blog: <a href="http://blogs.adobe.com/aharui"><span style='color:blue'>http://blogs.adobe.com/aharui</a><o:p></o:p> color:#1F497D'><o:p> </o:p> <div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'> From:<span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Maxim Porges [mailto:[email protected]] Sent: Monday, February 09, 2009 9:22 PM To: [email protected] Subject: How do you compile Flex-dependent classes with ASC?<o:p></o:p> </div> <o:p> </o:p> A new discussion was started by Maxim Porges in Developers -- How do you compile Flex-dependent classes with ASC? Hi, I've been trying unsuccessfully for most of the evening to compile a .as file that relies on mx.collections.ListCollectionView using asc. I figured I could just import the Flex framework SWCs from the command line with asc, but asc doesn't seem to respect SWCs - it only seems to respect .abc files. So, I've spent most of my time trying to compile the Flex framework into a single .abc file that I can import whenever I want to compile a class that relies on Flex. I figured I could make a base .as file with include statements for all of the Flex .as files (copying the approach I saw for files like builtin.as) and compile that, but all I seem to get are compiler errors - mostly "[Compiler] Error #1181: Forward reference to base class (base class name)." I have a feeling I'm doing this completely the wrong way. I'd very much appreciate any assistance that anybody can offer me. Thanks, - max <o:p></o:p> <div class=MsoNormal> <hr size=2 width=200 style='width:150.0pt' align=left> </div> View/reply at <a href="http://www.adobeforums.com/webx?13@@.59b7d5d2">How do you compile Flex-dependent classes with ASC?</a> Replies by email are OK. Use the <a href="http://www.adobeforums.com/webx?280@@.59b7d5d2!folder=.3c060fa3">unsubscribe</a> form to cancel your email subscription.<o:p></o:p> </div>

Database Time Spent Waiting (%): Wait Class Other nearly 100% all the time

Don't understand why OEM is reporting that Database Time Spent Waiting (%): Wait Class Other is nearly 100% all the time. Database 10.1.0.4 just installed on Linux(RHEL4AS) and nobody use it for now except OEM and me for admin purpose.
Any clue for that problem ?
Regards
Nicolas

Seems like you are not the first to see this kind of behaviour.
I've found another similar thread on metalink. I can't say the answer is terribly helpful, but thought you might be interested anyway:
From: Jose Ramón Tourón 14-Sep-07 08:34
Subject: Database Time Spent Waiting (%) at 100 in event class Commit
RDBMS Version: Oracle 10g r2
Operating System and Version: Suse Enterprise Linux 10
Error Number (if applicable):
Product (i.e. SQL*Loader, Import, etc.): database core
Product Version: 10gR2
Database Time Spent Waiting (%) at 100 in event class Commit
Hi everyone, yesterday we create a new database instance with dbca, the creation process was ok, and the two instances are running ok, database stops and starts without any problem, and listeners are ok. In the enterprise manager of this new instance we found this message:
Database Time Spent Waiting (%) at 100 in event class Commit, this event happend every 1 or 2 minutes sometimes at 100, the next 40%, the next 98, ... and so on.
Do you know what's happend in this instance?
Thanks in advance to everyone
Santiago Pérez
From: Oracle, Helmut Pfau 14-Sep-07 12:52
Subject: Re : Database Time Spent Waiting (%) at 100 in event class Commit
From Oracle Database Reference Manual:
Commit
This wait class only comprises one wait event - wait for redo log write confirmation after a commit (that is, 'log file sync')
So you can't write fast enough into your log files.
Did you check the frequency of log switches?
From: Metalink TCS User Group TCS Uruguay 14-Sep-07 15:52
Subject: Re : Database Time Spent Waiting (%) at 100 in event class Commit
Hi José! Please don't get anxious because of this: Wait time must be SOMEWHERE, there's a saying "An OLTP DB is only as fast as its redo logs", but if you are not having any performance problem you don't need to do anything special.
You say you've just created the DB. Now make it DO something: put it to the test by simulating production conditions as closely as you can, and after some hours ask the users whether there is some problem. If there is, take a look at the wait statistics... you'll probably see many other top events before this one!
Bruno abate_at_adinet.com.uy

Just in time Compilation Error

Hai ,
i got the following Error :
Just in Time Compilation Error
Invalid parser construct found on line 26 at position 19.
ColdFusion was looking at the following text:.Invalid
expression format.
The usual cause is an error in the expression structure.
this error occurs on cold fusion 5.
this class works fine on Cold fusion mx and 7.
This class basically uses the zip api of java to zip files.
<cfobject type="java" class="myZip" name="z">
<cfset result =
z._ZFolder("G:\Official\Development\Team05\zip\","G:\Official\Development\Team05\mi.zip") >
<cfoutput>#result# </cfoutput>

It might help to escape the # character in the other two
colours, thus
bordercolordark="##006600" bordercolorlight="##66CC33"

Run time error while using Class gcl_error

Hi All,
I am getting run time error while using class gcl_error
                                      type REF to zsreport_error_handling:
'' Attempt to access a component using 'NULL' object reference (points to nothing).
An object reference must point to an object ( an instance of a class) before you can use it to access components ( variable : ''GCL_ERROR'').
Either the reference point has not yet been set or it has been reset to 'NULL' by a clear statement."
Can you please suggest any solution for this ?
Thanks in advance.

Dear All
Its Resolved Thanks For your Valuable time Support
INCLUDE LV03VFB4 inside below code trigger error.
PERFORM VVBBD_AUFBAUEN USING WA_AVBBD
                                    WA_AVBBD-APOMOBILE
                                    DA_SUBRC
                                    DA_UPDKZ
                                    DA_VVBBD_TABIX
                                    0.
This Was the Error some how 0 was there we are removed the 0 now it is working fine
Rgds
Thomson

Unable to compile the java class in the SQL PLUS

Hi Team,
I am unable to compile the java class in the SQL PLUS in dev1 and dev2. It is giving the following error.
But the same class get Compiled in the Toad(Tool) without any error and working fine. Could someone help me
What to do for this for your reference ,Attaching the java class file.
“ORA-29536: badly formed source: Encountered "<EOF>" at line 1, column 28.
Was expecting one of:
----------------------Here is the Java class Code.....................
create or replace and compile java source named "XXVM_ZipFileUtil_Ela"
as
import java.math.BigDecimal;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import oracle.sql.*;
import oracle.jdbc.*;
import java.sql.*;
import java.io.*;
public class XXVM_ZipFileUtil_Ela
public static oracle.sql.BLOB getZipFile(
oracle.sql.CHAR zipFilePathCHAR, oracle.sql.CHAR zipFileNameCHAR,
int fileBufferSize, int zipFileBufferSize,
boolean deleteZipFile, java.sql.Array fileNames, java.sql.Array fileContents, java.sql.Array fileContentsLength)
throws IllegalArgumentException, FileNotFoundException, IOException, java.sql.SQLException
String zipFilePath = (zipFilePathCHAR == null) ? null : zipFilePathCHAR.stringValue();
String zipFileName = (zipFileNameCHAR == null) ? null : zipFileNameCHAR.stringValue();
String zipPathAndFileName = new String(
new String(zipFilePath == null || zipFilePath == "" ? "/tmp/" : zipFilePath) +
new String(zipFileName == null || zipFileName == "" ? System.currentTimeMillis() + ".zip" : zipFileName));
byte[] buffer = new byte[fileBufferSize == 0 ? 100000000 : fileBufferSize];
try
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
oracle.sql.CLOB[] fileContentsCLOB = (oracle.sql.CLOB[])fileContents.getArray();
String[] fileNamesString = (String[])fileNames.getArray();
BigDecimal[] fileContentsLengthNumber = (BigDecimal[])fileContentsLength.getArray();
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPathAndFileName));
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
for (int i = 0; i < fileNamesString.length; i++) {
System.out.println(i);
zipOut.putNextEntry(new ZipEntry(fileNamesString));
InputStream asciiStream = fileContentsCLOB[i].getAsciiStream(1L);
int asciiReadCount = asciiStream.read(buffer,0,fileContentsLengthNumber[i].intValue());
zipOut.write(buffer, 0, fileContentsLengthNumber[i].intValue());
zipOut.closeEntry();
zipOut.close();
byte zipFileContents[] = new byte[zipFileBufferSize == 0 ? 100000000 : zipFileBufferSize];
FileInputStream zipIn = new FileInputStream(zipPathAndFileName);
int byteCount = zipIn.read(zipFileContents);
zipIn.close();
byte returnFileContents[] = new byte[byteCount];
System.arraycopy(zipFileContents,0,returnFileContents,0,byteCount);
String returnFileContentsString = new String(returnFileContents);
if (deleteZipFile)
boolean deletedFile = (new File(zipPathAndFileName)).delete();
oracle.sql.BLOB returnFileContentsBLOB = null;
returnFileContentsBLOB = BLOB.createTemporary(conn, true, BLOB.DURATION_SESSION);
returnFileContentsBLOB.open(BLOB.MODE_READWRITE);
//OutputStream tempBlobWriter = returnFileContentsBLOB.getBinaryOutputStream();
OutputStream tempBlobWriter = returnFileContentsBLOB.setBinaryStream(1);
tempBlobWriter.write(returnFileContents);
tempBlobWriter.flush();
tempBlobWriter.close();
returnFileContentsBLOB.close();
return returnFileContentsBLOB;
catch (IllegalArgumentException ex) {
ex.printStackTrace();
throw ex;
catch (FileNotFoundException ex) {
ex.printStackTrace();
throw ex;
catch (IOException ex)
ex.printStackTrace();
throw ex;
catch (java.sql.SQLException ex)
ex.printStackTrace();
throw ex;

860411 wrote:
Hi Team,
I am unable to compile the java class in the SQL PLUS in dev1 and dev2. It is giving the following error.
But the same class get Compiled in the Toad(Tool) without any error and working fine. Could someone help me
What to do for this for your reference ,Attaching the java class file.
“ORA-29536: badly formed source: Encountered "<EOF>" at line 1, column 28.
Was expecting one of:
I believe the error message is clear and self-explanatory.
----------------------Here is the Java class Code.....................
create or replace and compile java source named "XXVM_ZipFileUtil_Ela"
as
import java.math.BigDecimal;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import oracle.sql.*;
import oracle.jdbc.*;
import java.sql.*;
import java.io.*;
public class XXVM_ZipFileUtil_Ela
public static oracle.sql.BLOB getZipFile(
oracle.sql.CHAR zipFilePathCHAR, oracle.sql.CHAR zipFileNameCHAR,
int fileBufferSize, int zipFileBufferSize,
boolean deleteZipFile, java.sql.Array fileNames, java.sql.Array fileContents, java.sql.Array fileContentsLength)
throws IllegalArgumentException, FileNotFoundException, IOException, java.sql.SQLException
String zipFilePath = (zipFilePathCHAR == null) ? null : zipFilePathCHAR.stringValue();
String zipFileName = (zipFileNameCHAR == null) ? null : zipFileNameCHAR.stringValue();
String zipPathAndFileName = new String(
new String(zipFilePath == null || zipFilePath == "" ? "/tmp/" : zipFilePath) +
new String(zipFileName == null || zipFileName == "" ? System.currentTimeMillis() + ".zip" : zipFileName));
byte[] buffer = new byte[fileBufferSize == 0 ? 100000000 : fileBufferSize];
try
Connection conn = DriverManager.getConnection("jdbc:default:connection:");
oracle.sql.CLOB[] fileContentsCLOB = (oracle.sql.CLOB[])fileContents.getArray();
String[] fileNamesString = (String[])fileNames.getArray();
BigDecimal[] fileContentsLengthNumber = (BigDecimal[])fileContentsLength.getArray();
ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(zipPathAndFileName));
zipOut.setLevel(Deflater.DEFAULT_COMPRESSION);
for (int i = 0; i < fileNamesString.length; i++) {
System.out.println(i);
zipOut.putNextEntry(new ZipEntry(fileNamesString));
InputStream asciiStream = fileContentsCLOB[i].getAsciiStream(1L);
int asciiReadCount = asciiStream.read(buffer,0,fileContentsLengthNumber[i].intValue());
zipOut.write(buffer, 0, fileContentsLengthNumber[i].intValue());
zipOut.closeEntry();
zipOut.close();
byte zipFileContents[] = new byte[zipFileBufferSize == 0 ? 100000000 : zipFileBufferSize];
FileInputStream zipIn = new FileInputStream(zipPathAndFileName);
int byteCount = zipIn.read(zipFileContents);
zipIn.close();
byte returnFileContents[] = new byte[byteCount];
System.arraycopy(zipFileContents,0,returnFileContents,0,byteCount);
String returnFileContentsString = new String(returnFileContents);
if (deleteZipFile)
boolean deletedFile = (new File(zipPathAndFileName)).delete();
oracle.sql.BLOB returnFileContentsBLOB = null;
returnFileContentsBLOB = BLOB.createTemporary(conn, true, BLOB.DURATION_SESSION);
returnFileContentsBLOB.open(BLOB.MODE_READWRITE);
//OutputStream tempBlobWriter = returnFileContentsBLOB.getBinaryOutputStream();
OutputStream tempBlobWriter = returnFileContentsBLOB.setBinaryStream(1);
tempBlobWriter.write(returnFileContents);
tempBlobWriter.flush();
tempBlobWriter.close();
returnFileContentsBLOB.close();
return returnFileContentsBLOB;
catch (IllegalArgumentException ex) {
ex.printStackTrace();
throw ex;
catch (FileNotFoundException ex) {
ex.printStackTrace();
throw ex;
catch (IOException ex)
ex.printStackTrace();
throw ex;
catch (java.sql.SQLException ex)
ex.printStackTrace();
throw ex;
The last two lines above should be
/Srini

How to compile the Java classes generated in JAXB

I am using Windows 2000 Operating System. I found a xjc
batch file on the sun's java forum.
I used that to generate classes from XML. After generating
the classes I could not compile
the classes each depends on other AND THEY REQUIRE BOTH
CLASS FILES.
I will attach the schema file and dtd . Can you explaine me the problem.
#<transactions.dtd>
<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT transactions (cardtocard*)>
<!ELEMENT cardtocard (tocard, fromcard, fromcardver, amount, transdate, transid)
>
<!ELEMENT tocard (#PCDATA)>
<!ELEMENT fromcard (#PCDATA)>
<!ELEMENT fromcardver (#PCDATA)>
<!ELEMENT amount (#PCDATA)>
<!ELEMENT transdate (#PCDATA)>
<!ELEMENT transid (#PCDATA)>
transactions.xjs
<xml-java-binding-schema>
<element name="transactions" type="class" root="true"/>
<element name="cardtocard" type="class"/>
</xml-java-binding-schema>
XML file
?xml version="1.0" encoding="UTF-8"?>

<transactions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="C:\My Documents\Xml\SVTConcord.xsd">
<cardtocard>
<tocard>1111222233334444</tocard>
<fromcard>6666777788889999</fromcard>
<fromcardver>567</fromcardver>
<amount>100.00</amount>
<transdate>2002-06-04 00:00:00.000</transdate>
<transid>1111222202</transid>
</cardtocard>
</transactions>
the XJC compiler for windows is
@echo off
echo JAXB Schema Compiler
echo --------------------
if "%JAVA_HOME%" == "" goto errorJVM
if "%JAXB_HOME%" == "" goto errorJAXB
set JAXB_LIB=%JAXB_HOME%\lib
set JAXB_CLASSES=%JAXB_HOME%\classes
echo %JAVA_HOME%\bin\java.exe -jar %JAXB_LIB%\jaxb-xjc-1.0-ea.jar %1 %2 %3 %4 %5
%JAVA_HOME%\bin\java.exe -jar %JAXB_LIB%\jaxb-xjc-1.0-ea.jar %1 %2 %3 %4 %5
goto end
:errorJVM
echo ERROR: JAVA_HOME not found in your environment.
echo Please, set the JAVA_HOME variable in your environment to match the
echo location of the Java Virtual Machine you want to use.
echo For example:
echo set JAVA_HOME=c:\jdk1.4.0_01
goto end
:errorJAXB
echo ERROR: JAXB_HOME not found in your environment.
echo Please, set the JAXB_HOME variable in your environment to match the
echo location of the JAXB installation directory.
echo For example:
echo set JAXB_HOME=c:\jdk1.4.0_01\jaxb-1.0-ea
:end

When you compile the generated classes, be sure to put jaxb-rt-1.0-ea.jar in your classpath!

Workshop error during compilation of Java class

Hi,
I am starting to use Workshop for development. I am getting the following error when I start the debugger.
I am trying to compile a Java class and don't know how to proceed. Any help is appreciated.
build:
Deleting directory C:\DOCUME~1\name\LOCALS~1\Temp\wlw-temp-23835\wlw_compile55184
Created dir: C:\DOCUME~1\name\LOCALS~1\Temp\wlw-temp-23835\wlw_compile55184
C:\bea\user_projects\applications\CVXMLBeansApplication\CVXMLBeansClient\
ERROR: XMLBeansClient.java:12: The package of this type does not match its location on the source path: .
ERROR: 1 error(s), 0 warning(s).
BUILD FAILED
ERROR: Errors found.

I found the answer nested in the documentation. I had to create folders that mirror the package structure and then place the source file in its appropriate folder.

Ojc will compile the following class. A bug?

I thought that in Java classes cannot be declared protected. ojc will however compile the following class:
protected class aclass
The Sun java compiler prints the following error:
aclass.java:1: modifier protected not allowed here
protected class aclass
Is this a known bug in the Oracle Java compiler?

Yes, it seems we have a little bug in OJC, the protected access modifier should only be allowed for member classes. I filed a bug report and I'll fix it.
Thanks!
Keimpe Bronkhorst
JDev Team

Time series error in class /SCF/CL_ICHDM_DATAAXS method /SCF/IF_ICHDMAXS_2_

Hi,
In SNC system, the supplier is getting the following error when he is trying to update the planned receipt quantity.
Due to that error the ASN canu2019t be created and sent to ECC system.
Time series error in class /SCF/CL_ICHDM_DATAAXS method /SCF/IF_ICHDMAXS_2_CNTL~SAVE
Please give your inputs as to how to resolve this error.
Regards,
Shivali

Hi Shivali,
This is not related to time series data issue.
ASN (ASN number:122593)XML failed may be because of there no Purchase order(Reference order) exists for supplier 0000104466 which will be there in failed XML.(see the DespatchedDeliveryNotification_In XML check XML tag <PurchaseOrderReference> value under tag <Item>)
Login as a supplier 0000104466 and search for purchase order (or replenishment order) and this PO(or RO) won't be there in supplier 0000104466 .
That's why ASN got failed.
Regards,
Nikhil

Compiler Errors With Class Definitions and Clients

Hi there, I need help with some code, here it is.
import java.util.*;
import java.text.*;
public class InvestCalc {
     //declaration of instance variables
     private double interest, principal;
     //default constructor, sets interest and principal to zero
     public InvestCalc() {
          interest = 0.0;
          principal = 0.0;
     //overloaded constructor
     public InvestCalc( double startInterest, double startPrincipal) {
          interest = startInterest;
          principal = startPrincipal;
     //accessor methods for instance variables
     public double getRate() {
          return interest;
     public double getPrincipal() {
          return principal;
     //mutator methods
     public void setRate(double newInterest) {
          interest = newInterest;
     public void setPrincipal(double newPrincipal) {
          principal = newPrincipal;
     //String toString() method
     public String toString() {
          return "Interest Rate: " + percent.format(interest) + ", Principal: " + DOLLAR_FORMAT.format(principal);
     //futureValue(int year) method
     public double futureValue(int year) {
          double futureValue = Math.pow((1 + interest), year)*principal;
          return futureValue;
     //public static final class variables
     public static final int shortTerm = 5;
     public static final int middleTerm = 10;
     public static final int longTerm = 20;
     //public void display Table() method
     public void displayTable() {
          System.out.println("Year" + "\t" + "Interest Rate" + "\t\t" + "Principal" + "\t\t" + "Future Value");
          System.out.println(shortTerm + "\t" + percent.format(interest) + "\t\t\t" + DOLLAR_FORMAT.format(principal) + "\t\t" + DOLLAR_FORMAT.format(futureValue(shortTerm)));
          System.out.println(middleTerm + "\t" + percent.format(interest) + "\t\t\t" + DOLLAR_FORMAT.format(principal) + "\t\t" + DOLLAR_FORMAT.format(futureValue(middleTerm)));
          System.out.println(longTerm + "\t" + percent.format(interest) + "\t\t\t" + DOLLAR_FORMAT.format(principal) + "\t\t" + DOLLAR_FORMAT.format(futureValue(longTerm)));
     //formatting section
     public static final NumberFormat DOLLAR_FORMAT = NumberFormat.getCurrencyInstance();
     public static final DecimalFormat percent = new DecimalFormat("##0.00%");
import java.util.*;
public class InvestCalcApp {
      * @param args
     public static void main(String[] args) {
          // TODO Auto-generated method stub
          //declare Scanner class and interest, principal vars
          Scanner input = new Scanner(System.in);
          double interest, principal;     //vars for the interest rate and initial investment
          //instantiate a default object of the InvestCalc class
          InvestCalc value1 = new InvestCalc();
          System.out.println("Default InvestCalc Object");
          System.out.println(value1.toString()+ "\n");
          //query for interest and principal
          System.out.print("Enter an interest rate in decimal format: ");
          interest = input.nextDouble();
          System.out.print("Enter the initial investment value: ");
          principal = input.nextDouble();
          //change object and output
          value1.setRate(interest);
          value1.setPrincipal(principal);
          System.out.println("Updated InvestCalc Object");
          System.out.println(value1.toString());
          //test the futureValue method and the DOLLAR_FORMAT static class variable
          System.out.println("Value after 1 year " + InvestCalc.DOLLAR_FORMAT.format(value1.futureValue(1)) + "\n");
          value1.displayTable();
          //query for another interest and principal
          System.out.print("Enter another interest rate in decimal format: ");
          interest = input.nextDouble();
          System.out.print("Enter another initial investment value: ");
          principal = input.nextDouble();
          //instantiate an object of the InvestCalc class
          InvestCalc value2 = new InvestCalc(interest, principal);
          System.out.println("Non-Default InvestCalc Object");
          System.out.println(value2.toString()+ "\n");
          value2.displayTable();
}When I compile InvestCalc.java it compiles; however, when I compile InvestCalcApp.java I receive 5 errors:
InvestCalcApp.java:15: cannot find symbol
symbol : class InvestCalc
location: class InvestCalcApp
                 InvestCalc value1 = new InvestCalc();
InvestCalcApp.java:15: cannot find symbol
symbol : class InvestCalc
location: class InvestCalcApp
                 InvestCalc value1 = new InvestCalc();
InvestCalcApp.java:32: package InvestCalc does not exist
                              System.out.println("Value after 1 year " + InvestCalc.DOLLAR_FORMAT.format(value1.futureValue(1)) + "\n");
InvestCalcApp.java:42: cannot find symbol
symbol : class InvestCalc
location: class InvestCalcApp
                 InvestCalc value2 = new InvestCalc(interest, principal);
InvestCalcApp.java:42: cannot find symbol
symbol : class InvestCalc
location: class InvestCalcApp
                 InvestCalc value2 = new InvestCalc(interest, principal);Sorry if that's a lot of reading, but I need help, I'm new at this and not quite sure what those errors mean. Thanks

The errors mean the compiler can not find the InvestCalc class. The compiler looks for classes using the Classpath. It might work if you use a command likejavac -cp . InvestCalcApp.javaThis command tells javac to look in the current directory for dependent classes.

Flex Builder stops compile new ActionScript classes

Hello,
Does anyone knows what could cause Flex Builder 3.4 stops compiling NEW ActionScript classes? I have been working on Flex project for a while, we have some MXML and .as files (less than 200). This morning Flex Builder suddenly stopped detecting errors in new as classes, but not so for older classes. Thanks and appreciate your help.
- Weiping

Are your new classes referenced from the old code? Mxmlc employs a questionable form of "as-needed" linking, so classes that are not referenced from the main application are not even compiled. This referencing requirement is recursive; that is, any classes that are to be included have to be referenced from the main application, or from classes referenced by the main application, or from classes referenced by classes referenced by the main application, and so on. But if your new classes are not referenced at all from the old code, they will be ignored.

Compiling java package class referring a default package class.

I am trying to compile a java class having a package defination referring a java class with a default package.
The code for the default package class is .
public class Test{.
public static void main(String[] args){
System.out.println("Hello World!");
This class compiles fine.
I have another class called PackJava, whose code is :
package test;
import Test;
public class PackJava{
public static void main(String[] args){
Test test = new Test();
System.out.println("Hello World!");
I have Test file in the windows path
D:\development\packagetest\example
and the PackJava java file in the path
D:\development\packagetest\example\test
I have set the CLASSPATH environment varibale as
D:\development\packagetest\example;.
When I try to compile the PackJava from the
D:\development\packagetest\example path giving the command as
javac -classpath . test\PackJava.java
or
javac -classpath %CLASSPATH% test\PackJava.java
it gives me error,
Do any of you have an idea of the parameter i should pass
to the -classpath option
Thanks

There is a way around all this. The classes in the default packages need to implement an interface with the methods require. The interface can be in any package you want ie. com.work.around.interf.MyInterface1. Next, make this interface available in a Singleton. - The only catch here is that, the main method must reside in default package as well. And o, on start of main, instantiate the class you want and put it in the singleton. There after, you may refer to it from the singleton.
Enjoy.

Ahead of time compilation of core classes

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