Java Source to IA-32 Compilation

One of the features of Java that Sun has always pushed is cross-platform compatability. Thus the need for a VM. However, if I'm only writing an application for Windows, is there a way to compile my Java source code directly to a binary executable compatible with the IA-32 architecture(Intel)? I realize the JVM is more than just an interpreter for byte code, but the JVM can also be a drag on performance.

There are tools that can be purchased that will do that. The question is, "why?" Why use java for windows only code? As for the JVM a drag on perfomance, in the old days sure. Now it is negligible. Things like the hotspot VM do smart compiles to machine code inline and a bunch of other tricks. The most common reason why some java apps run slow is the ancient one. Basically that the java programmer that wrote it didnt know what he was doing. Examples: People that use GUI builder tools like that in JBuilder (Id love to throw all those dorks out the window). People that program in an OO language in a non OO fasion. People that believe that they will just go get a bigger cpu instead of refactoring the code to make it efficient.
The average code block in my department gts rewritten something like 5 times. If you look at the old stuff it is so stable and efficient that running JUnit on it is almost a waste of time and its classes are excluded from all JProbe tests.
Just what kind of project are you trying to code anyway ?

Similar Messages

Error in compiling java source code in a package

hi all...
am having a problem in compiling a java source code:
i have a class named 'Test' in the package 'packone'....
i have another class named 'getTest' in the same package....
in the class getTest i am taking a reference to Test class...
on compiling i am getting the following error....
cannot resolve symbol
symbol : class Test
The source code for the two classes are :
package packone;
public class Test{
and
package packone;
public class getTest{
public void me(){
Test t = new Test();
i have included the directory path in the classpath....
still its not compiling .....
please help
thanks....

Assume the current directory structure:
C:\
C:\packone...and that your classes are named Test & GetTest.
My guess is that you're compiling within the directory C:\packone using the command "javac GetTest.java", which is wrong; You must use a path corresponding to the package-name.
Move your command-line cursor to C:\ and type "javac packone\GetTest.java" and you'll be fine...
Regards,
/Håkan

How to compile in Java Source???

Hello,
I'm studying a way to compile java files to class files in the java source. I have use the sun.tools.javac.Main to do this, but I have noticed that it aint recomended to use. I also wan't to get the possible errors from the compiler (if java file was wrongly made). The problem using the sun.tools.javac.Main is that it won't guarantee that it works in every platform or in future releases of JDK. Does the JDK 1.4 even support it? (My IDE environment prevents to use JDK 1.4). So the question is: is there a way to compile on the fly (to memory or to class files)? Do I really have to run some external process that compiles the file and then try to get somehow possible errors? That seems to me litle too indecent to use. Any suggestions?
Thanks,
Petri Tuomaala

Hi guys,
I have also needed to compile Java source from within a Java application. Here is the best solution I came up with:
Process proc = Runtime.getRuntime().exec( "
C:\\Temp\\Jikes -bootclasspath C:\\jdk\\jre\\lib\\rt.jar C:\\Java\\com\\sts\\utility\\Utility.java" );
BufferedReader br = new BufferedReader( new InputStreamReader( proc.getErrorStream() ) );
String line = null;
while( (line = br.readLine()) != null ) {
System.out.println( line );
proc.waitFor();
I used Jikes http://oss.software.ibm.com/developerworks/opensource/jikes/ because it compiled my source quicker than Javac did - 250 millseconds for Jikes compared to 2750 milliseconds for Javac.

Compiling a java source in pl/sql developer - problems

Hi,
i'm using pl/sql developer and i created a javasource like this:
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
create or replace and compile java source named Test as
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.view.JasperViewer;
import persistencia.JdbcDaoFactory;
* @author igor.simoes
public class ProcessoRelController {
the problem is: when i compile the source, an error is displayed(canno't find symbol) in the first line (import net.sf.jasperreports.engine.JRException;)
i wanna know how can i make the oracle JVM see the package(.jar) that contains net.sf.jasperreports.engine.JRException class, and the others classes in the import statement..
thank's
Igor Simões

Hi,
Refer the 'Implementing the report service' section in the following article: http://java.dzone.com/articles/java-reporting-part-2
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;
import net.sf.jasperreports.engine.export.JRXlsExporter;
public static Connection establishConnection()
Connection connection = null;
try
Class.forName("oracle.jdbc.driver.OracleDriver");
String oracleURL = "jdbc:oracle:thin:@localhost:1521:mySID";
connection = DriverManager.getConnection(oracleURL,"username","password");
connection.setAutoCommit(false);
catch(SQLException exception)
exception.printStackTrace();
return connection;
-Priyanka

Enhancement Request: Actions for JAVA Sources (compile to CLASS)

Hi All,
I would like to change my JAVA Source in the DATABASE and compile it again. At the moment I can see only the code but have no actions to compile and generate it to classes. Is this planned for a future release? AS a LAYOUT idea ... if classes can not be displayed I would suggest to remove them from the tree - they are not needed to display as far as I can see a compiled SOURCE. Will Raptor provide this for the future??
Message was edited by:
Frank C. Hoffmann
Message was edited by:
Frank C. Hoffmann

I'm seeing the same problem; it will let me view Java code, and edit it in the editor, but there's no way of saving it back to the database, or compiling (or debugging or etc...)
Also, if I try and run java in via the sql window I get:
Error starting at line 1 in command:
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED "whatever" AS
Error report:
Non supported SQL92 token at position: 227:
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thanks,
William

Forte compile error java source files must have a .java suffix

Hello Guru's,
I am using Forte for Java release 2.0 build 1160, and Java SDK 1.3.1.
When I try to compile a project in Forte I get the following error :
"fastjavac: java source files must have a .java suffix C:\Program"
I have looked at the source files and they do hav .java suffix!
If this is not the correct form can someone point me in the right direction. If this is a correct forum then help is very much appreciated.
Cheers...Harki

Hi,
Try to compile like this:
javac yourfile.java
Hope this helps you.
Cheers.....Dinesh

Do we have to separate java source files and class files after compiled..

Hi,
I really confussed with this:
I have compiled java source files into a package and tried to use but the classes can not be found. Should I separate class and source files after compiled with packages names. I hope you understand what i mean.
Thank you
So Jag

You can choose to separate the source files or not. It sounds like your problem has to do with Classpath and packages.
If the file c:\base\compute\engine\mysourcefile.java starts with the statement "package engine;" then the fully qualified name of the class is is engine.mysourcefile. If the file c:\base\compute\client\mysourcefile.java starts with the statement "package client;" then its fully qualified name is client.mysourcefile.
In your source files, whenever you refer to a class from another class, the compiler needs the fully qualified class name. You can either import the class or use the fully qualified name. In order for the compiler to find the class, the c:\base\compute directory must be in the Classpath (assuming the package definitions from above).
Finally, to launch an application given the above, the command would be "java client.mysourcefile" assuming the main method is in client.mysourcefile.

Compile java source trough SQLPLUS (SP2-0317: expected symbol name is m...)

Hello,
I have a problem to compile java stored procedure trough SQLPLUS...
After connection on my DB I execute script which includes many java sources for example:
SPOOL INS-2870-2012.lst
PROMPT 'EncoderJava'
set def off
set def &
@@nsEUCStatistics.java
@@nsVerifier.java
@@nsICharsetDetectionObserver.java
@@nsSJISVerifier.java
@@Big5Statistics.java
@@EncodingDetector.java
@@EUCJPStatistics.java
@@EUCKRStatistics.java
spool offThe error I get is:
SP2-0317: expected symbol name is missing
Enter value for 0xff:
old 33:                   (s*v.stFactor()+(((v.cclass()[((b&0xFF)>>v.eidxSft4bits)])
new 33:
Enter value for v:
old 34:                   >> ((b & v.eSftMsk4bits) << v.eBitSft4bits))
new 34:
Enter value for v:
old 35:                   & v.eUnitMsk4bits ))&0xFF)
new 35:
Enter value for 0xff:
old 37:                   (s*v.stFactor()+(((v.cclass()[((b&0xFF)>>v.eidxSft4bits)])
new 37:
Enter value for v:
old 38:                   >> ((b & v.eSftMsk4bits) << v.eBitSft4bits))
new 38:
Enter value for v:
old 39:                   & v.eUnitMsk4bits ))&0xFF)
new 39:
Enter value for v:
old 40:                & v.eSftMsk4bits) << v.eBitSft4bits)) & v.eUnitMsk4bits )
new 40:
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED "org/mozilla/intl/chardet/nsVerifier" AS
ERROR at line 1:
ORA-29536: badly formed source: Encountered ">>" at line 32, column 18.
Was expecting one of:
"#sql" ...
"boolean" ...
"byte" ...
"char" ...
"double" ...
"false" ...
"float" ...
"int" ...
"long" ...
"new" ...
"null" ...
"short" ...
"super" ...
"this" ...
"true" ...
"void" ...
<INTEGER_LITERAL> ...
<FLOATING_POINT_LITERAL> ...
<CHARACTER_LITERAL> ...
<STRING_LITERAL> ...
<IDENTIFIER> ...
"~" ...
"++" ...
"+" ...
"-" ...If I execute java stored procedure in TOAD as script all works fine..
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED "org/mozilla/intl/chardet/nsVerifier" AS
package org.mozilla.intl.chardet ;
import java.lang.*;
public abstract class nsVerifier {
     static final byte eStart = (byte)0;
     static final byte eError = (byte)1;
     static final byte eItsMe = (byte)2;
     static final int eidxSft4bits = 3;
     static final int eSftMsk4bits = 7;
     static final int eBitSft4bits = 2;
     static final int eUnitMsk4bits = 0x0000000F;
     nsVerifier() {
     public abstract String charset() ;
     public abstract int stFactor()   ;
     public abstract int[] cclass()   ;
     public abstract int[] states()   ;
     public abstract boolean isUCS2() ;
     public static byte getNextState(nsVerifier v, byte b, byte s) {
         return (byte) ( 0xFF &
          (((v.states()[((
             (s*v.stFactor()+(((v.cclass()[((b&0xFF)>>v.eidxSft4bits)])
             >> ((b & v.eSftMsk4bits) << v.eBitSft4bits))
             & v.eUnitMsk4bits ))&0xFF)
          >> v.eidxSft4bits) ]) >> (((
             (s*v.stFactor()+(((v.cclass()[((b&0xFF)>>v.eidxSft4bits)])
             >> ((b & v.eSftMsk4bits) << v.eBitSft4bits))
             & v.eUnitMsk4bits ))&0xFF)
          & v.eSftMsk4bits) << v.eBitSft4bits)) & v.eUnitMsk4bits )
/What I'am doing wrong or how to run my script to load "java source" on my db... (without loadjava)...
regards

Hi,
peterv6i.blogspot.com wrote:
Hello,
I have a problem to compile java stored procedure trough SQLPLUS...
After connection on my DB I execute script which includes many java sources for example:
SPOOL INS-2870-2012.lst
PROMPT 'EncoderJava'
set def off
The command above tells SQL*Plus not to scan for substitution variables, and to treat the character that marks substitution variables (which is & by default) as a normal character.
set def &That completely reverses the previous SET DEF command: it tells SQL*Plus to treat & as a special character that marks substitution variables.
Perhaps you meant to issue the second SET DEF command after running all the scripts, like this:
set def off
-- & has no special meaning at this point
@@nsEUCStatistics.java
@@nsVerifier.java
@@nsICharsetDetectionObserver.java
@@nsSJISVerifier.java
@@Big5Statistics.java
@@EncodingDetector.java
@@EUCJPStatistics.java
@@EUCKRStatistics.java
-- Resume default beahvior of &
set def &
spool offThis way, & will have no special meaning while you run all those .java files, but it will resume having it's special meaning as the substitution variable marker after that, so you can run other scripts which use that feature later in the same session.

Error while compiling the ejb java source files.................

hi,
i am new to ejb.......
i have got error while compiling the ejb java source files............
while compiling..........of this three i ahve got err in ejb home interface....
ejb remote interface - succeded
ejb bean class - succeded
ejb home interface - error
the error..............is in the return type of the ejb create() method in ejb home interface(which is the type of remote interface).
the error message is cannot resolve symbol

Hi,
thanks for ur reply .....
i have done enough searching in all sites including sun forum but in vain
i have pasted my error below...
can u plz predict anything from it
D:\>path=%path%;c:\j2sdk1.4.2_12\bin;
D:\>set classpath=%classpath%;d:\Sun\AppServer\lib\j2ee.jar;
D:\>javac d:\Librarys\Library.java
D:\>javac d:\Librarys\LibraryBean.java
D:\>javac d:\Librarys\LibraryHome.java
d:\Librarys\LibraryHome.java:8: cannot resolve symbol
symbol : class Library
location: interface Librarys.LibraryHome
public Library create(String id, String name, String address, String phoneNo
) throws RemoteException, CreateException;
^
d:\Librarys\LibraryHome.java:9: cannot resolve symbol
symbol : class Library
location: interface Librarys.LibraryHome
public Library findByPrimaryKey(String id) throws FinderException, RemoteExc
eption;
^
2 errors
thanks in advance...

How to compile a java source from a java program

Hi .
I would like to know how to compile my java source from inside an execution of a java program.
Is there another way than rather use :
Runtime.getRuntime().exec("javac myFile"); ?

you can and cann't use the source code of javac... or maybe use jikes...

Alter java source compile hangs on cpu

When trying to compile java on the database, the session hangs, and is consuming massive CPU.
Statements executed:
create or replace java source named "hw" as
public class hw {public static String helloWho(String ename) {return "Hello "+ename;}}
alter java source "hw" compile
This worked before. Same problem occurs when using javaload. I tried this in a newly created schema aswell. Any ideas?
Db is a 11.2.0.1.0
Regards, Jan

Jan Leers wrote:
When trying to compile java on the database, the session hangs, and is consuming massive CPU.
Statements executed:
create or replace java source named "hw" as
public class hw {public static String helloWho(String ename) {return "Hello "+ename;}}
alter java source "hw" compile
This worked before. Same problem occurs when using javaload. I tried this in a newly created schema aswell. Any ideas?
Db is a 11.2.0.1.0
Regards, Jandoes code do DML?
does code do COMMIT?

Any way to search for casts in java source code?

Anyone know of a decent way to search your java source files to find all the casts?
I ended up doing a simple text search for
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     String s = (String) iterator.next();Unfortunately, the above search has all kinds of problems with both false positives and negatives. It picks up lots of irrelevant lines like
     int index = (number > 0) ? 0 : 1;as well as misses casts that appear nested inside expressions like
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I think that the only way to properly do this is to have a tool which understands java syntax.
Anyone know of an IDE which will do this? Does IntelliJ or Netbeans support this kind of search?
In case you are wondering why I am interested in this, it is because I am refactoring some code to fully use generics, and searching for casts is one source of identifying candidates for genericity.

cliffblob wrote:
Better late than never?Yes!
cliffblob wrote:
...The answer I found to ID unnecessary casts was, using Eclipse IDE, In compiler error and warning preferences to warn on unnecessary casts.Thanks for pointing IDEs out. I just opened IntelliJ, and going back to at least version 7.04 (maybe earlier) they have an inspection for "Redundant type cast".
cliffblob wrote:
I would still be interested to know if there is a way to identify casts in general in your source, perhaps now four years later there is a way?The only solutions that I can think of are either a complicated regex search, or you must use some tool like an IDE that understand Java syntax and can determine if a cast is happening.

Getting all the members (variables, methods AND method bodies) of a java source file

For a project I want to programmatically get access to the members of java source file (member variables, methods etc) as well as to the source code of those members. My question is what is the best method for this? So far I have found the following methods:
Use AST's provided by the Java Source API and Java Tree API, as discussed in the following posts:
http://today.java.net/pub/a/today/2008/04/10/source-code-analysis-using-java-6-compiler-apis.html
http://weblogs.java.net/blog/timboudreau/archive/2008/02/see_java_code_t.html
http://netbeans.dzone.com/announcements/new-class-visualization-module
This has the disadvantage that the classes actually have to be compilable. When I look at the Netbeans Navigator view however, it provides me with a nicely formatted UI list, regardless of the "compilable" state of the class.
Thus I started looking at how to do this... The answer appears to be through the use of tools such as JavaCC: https://javacc.dev.java.net/
ANTLR: http://www.antlr.org/
which are lexers and parsers of source code. However, since the Navigator panel already does this, couldn't I use part of this code to get me the list of variables and methods in a source file? Does the Navigator API help in this regard?
Another route seems to be through tools such as
BeautyJ: http://beautyj.berlios.de/
which run on top of JavaCC if I am correct, and which has the ability to provide a clean view on your java code (or an XML view). However, BeautyJ does not seem to be too actively developed, and is only j2se1.4 compatible.
I hope someone can shed a light on the best way to go about what I want to achieve. Somebody already doing this?
(I crossposted on the Netbeans forums too, hope this is OK...)

I'm currently developing a LaTeX editor(MDI) and I do the same thing, but I don't know what exactly do you need.

How can I share a *.java source file across multiple projects in NetBeans?

I'm sure this simple and a pretty common operation but how can I share a *.java source file across multiple projects in NetBeans? Right now I keep cut, coping and pasting the same source file between multiple projects to re-use the same code. But I could I make this source file a library file or something like that so that I could access it from any project. I assume this would be a generic operation but I mentioned NetBeans for clarity. Thanks.

fiebigc wrote:
I know I mentioned NetBeans but I'm most interested in the generic method for creating a library of source files that I can call into whatever program I am developing. I've done such a thing in C using header files and such but I'm trying to get a direction on how this is accomplished in Java. I'm sorry if I could edit the title I would. If anyone wants to be specific about NetBeans I welcome that too.
Edited by: fiebigc on Jun 20, 2008 5:57 PM
>I know I mentioned NetBeans but I'm most interested in the generic method for creating a library of source files that I can call into whatever program I am developing. I've done such a thing in C using header files and such but I'm trying to get a direction on how this is accomplished in Java. I'm sorry if I could edit the title I would. If anyone wants to be specific about NetBeans I welcome that too.
Edited by: fiebigc on Jun 20, 2008 5:57 PM
Create a class library.
Write your code, compile it to .class files, put those class files in a .jar file and include the jar file in the classpath whenever you want to compile a project against it.

How to read the Java source code (in Netbeans)

I use OS X10.5.5, NetBeans 6.1 and JSE 6 on a 64 bit mac.
When I downloaded NB6.1 it had JSE 5 as it's default (and only) java platform. I ran Software Update to get Java 6 from Apple, used the Java Prefrences utitlity to set JSE6 as default. In NB I added the JDK6 platform, registered the JDK6 javadocs and noticed that I also have the option of registering the Java source code.
I have three questions:
1) How do I make JDK6 the default in NetBeans. The JDK5 keeps being default after I did the steps above and I don't see anywhere to change that.
2) How do I read the Java 6 source code? I can see sun provides [source code| http://download.java.net/jdk6/] for their supported platforms. I dont see Apple doing the same for its JDK port. What would I need to do to get to read the java SE6 sources? or is it actually hiding somewhere in the /System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home hierarchy?
3) Where does the JVM look for the binary code to run when I make a call to, say java.util.ArrayList or any other library. In my naivety I would have assumed it would be a .class file somewhere in the java Home folder, but I don't see anything like it.
thanks in advance,
chris

This is taken from the help included with netbeans. In response to question 1.
By default, the IDE uses the version of the Java SE platform (JDK) with which the IDE runs as the default Java platform
for compilation, execution, and debugging. You can view your IDE's JDK version by choosing Help > About and clicking the
Detail tab. The JDK version is listed in the Java field.
You can run the IDE with a different JDK version by starting the IDE with the --jdkhome jdk-home-dir switch on the command line
or in your IDE-HOME/etc/netbeans.conf file. For more information, see IDE Startup Parameters.
In the IDE, you can register multiple Java platforms and attach Javadoc and source code to each platform. For example, if you
want to work with the new features introduced in JDK 5.0, you would either run the IDE on JDK 5.0 or register JDK 5.0 as a
platform and attach the source code and Javadoc to the platform.
In , you can switch the target JDK in the Project Properties dialog box. In , you have to set the target JDK in the Ant script itself,
then specify the source/binary format in the Project Properties dialog box.
To register a new Java platform:
Choose Tools > Java Platforms from the main window.
Click New Platform and select the directory that contains the Java platform. Java platform directories are marked with a
in the file chooser.
Use the Sources and Javadoc tabs to attach Javadoc documentation and source code for debugging to the platform.
Click Close.
To set the default Java platform for a standard project:
Right-click the project's root node in the Projects window and choose Properties.
In the Project Properties dialog box, select the Libraries node in the left pane.
Choose the desired Java platform in the Java Platform combo box.
Switching the target JDK for a standard project does the following:
Offers the new target JDK's classes for code completion.
If available, displays the target JDK's source code and Javadoc documentation.
Uses the target JDK's executables (javac and java) to compile and execute your application.
Compiles your source code against the target JDK's libraries.
If you want to register additional Java platforms with the IDE, you can do so by clicking the Manage Platforms button.
Then click the Add Platform button and navigate to the desired platform.
To set the target Java platform for a free-form project:
In your Ant script, set the target JDK as desired in the javac, java, and javadoc tasks.
Right-click the project's root node in the Projects window and choose Properties.
In the Sources panel, set the level of JDK you want your application to be run on in the Source/Binary Format combo box.
When you access Javadoc or source code for JDK classes, the IDE searches the Java platforms registered in the
Java Platform Manager for a platform with a matching version number. If no matching platform is found, the IDE's default platform is used instead.
See Also
Managing the Classpath
Declaring the Classpath in a Free-Form Project
Stepping Through Your Program
Legal Notices

Java Source to IA-32 Compilation

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