Compile Java to exe

Hello everybody!
Does anyone of you know, how to compile a java file to a single windows executable (*.exe)? Is that possible?
What programes do I need, and what is needed on the computer on which to run the *.exe ?
CU
Netzmeister2k

Plz try ZERO G Install Anywhere program ... You can download it from http:\\www.zerog.com.... I think now a free version is available for personal use ... other wise you have to purchase it .... You can download it from the site ..... In my opinion , I used zerog instally anywhere software ... it is best for java classes to exe ..... You can make exe with JVM and with out JVM .... it depends you ... I recommend this software ........Bye

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I want to compile java for *.exe program?

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ThanksYou're welcome, but the correct answer was allready
given in previous response.oops, late again, must edit.
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How to compile java to exe by JDeveloper?

How to compile java to exe by JDeveloper?

You used to be able to use exegen to generate stand alone executables for Windows, but this no longer works in later versions of Windows. It works for Windows 98 and NT. For example
exegen/main:schedserv /out:sched.exe schedserv.class scheduler.class
will generate the executable sched.exe from the two class files.
Probably MicroSoft decided to make life a bit harder for Java users.

Compiling JAVA into Windows .exe files

Hi,
Here's an easy question - how do you compile JAVA source into Windows .exe files (as opposed to class files with bytecode in them). I imagine there is a third-party product out there somewhere?

A Bayesian network is a mathematical representation of logical inference.
A very simple example has two nodes: "has tail" and "is horse", connected by a single link. If we know "is horse" is true, then it nearly always follows that "has tail" is also true. This is called modus ponens in logic. If we know "has tail" is true, then "is horse" might be true, but it might not. To infer that "is horse" is true in such a case is to commit what is called the fallacy of affirming the consequent, in logic. However, using Bayes' theorem, which would require that we know some general information about the prevelance of horses among tailed animals, and the general prevalence of horses among things in general, we can measure the exact increase in the probability that "is horse" is true that results from our knowing "has tail" to be true.
For more information, see http://www.bayesian.org
The classic book on the subject is Judea Pearl, Probabilistic Reasoning in Intelligent Systems.

EXCEPTION_ACCESS_VIOLATION (0xc0000005) on compiled Java code

I'm confronted with the following error of this code.
http://db-www.naist.jp/~makoto-y/tmp/Int2LongHash.java
The exception appears only when the system gets high-load.
Is there work-arounds?
I've tried also with jdk1.5.0_06, but the same error occurred.
Converting the inner class to a top-level class has no effects.
# An unexpected error has been detected by Java Runtime Environment:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00a2cd75, pid=1540, tid=2968
# Java VM: Java HotSpot(TM) Client VM (1.6.0-beta2-b86 mixed mode)
# Problematic frame:
# J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap$ChainedEntry.recordRemoval(Lorg/metabrick/xbird/util/collections/Int2LongHash;)V
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
--------------- T H R E A D ---------------
Current thread (0x003f6800): JavaThread "main" [_thread_in_Java, id=2968]
siginfo: ExceptionCode=0xc0000005, writing address 0xfc2cee54
Registers:
EAX=0x42d43500, EBX=0x03d3ee00, ECX=0x03d3ee00, EDX=0x07911838
ESP=0x0091f760, EBP=0x0091f778, ESI=0x0790f9f8, EDI=0xfc2cee38
EIP=0x00a2cd75, EFLAGS=0x00010203
Top of Stack: (sp=0x0091f760)
0x0091f760: 0790ac30 079220b0 00000200 03d917f8
0x0091f770: 00000000 6d955aa7 0091f7a8 00a2c9dc
0x0091f780: 00000200 00000000 0091f7e8 00a12d50
0x0091f790: 5ab674cf 00000000 07911838 03d3ee00
0x0091f7a0: 03d8b700 00000010 0091f7f8 00a2c000
0x0091f7b0: 03d8b700 078e4af4 00000010 00a2ab04
0x0091f7c0: 078e4af4 03d8b700 00000010 00000001
0x0091f7d0: 00000000 6d955ae7 5ab674d0 00000000
Instructions: (pc=0x00a2cd75)
0x00a2cd65: 20 8b fe c1 ef 09 c6 87 80 b1 5b 48 00 8b 79 20
0x00a2cd75: 89 77 1c c1 ef 09 c6 87 80 b1 5b 48 00 8b e5 5d
Stack: [0x008d0000,0x00920000), sp=0x0091f760, free space=317k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap$ChainedEntry.recordRemoval(Lorg/metabrick/xbird/util/collections/Int2LongHash;)V
J org.metabrick.xbird.util.collections.Int2LongHash.remove(I)J
J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap.addEntry(IIJLorg/metabrick/xbird/util/collections/Int2LongHash$BucketEntry;)V
J org.metabrick.xbird.util.collections.Int2LongHash.put(IJ)J
J org.metabrick.xbird.xquery.util.StringChunk.storeCharChunk([CII)J
J org.metabrick.xbird.xquery.util.StringChunk.store([CII)J
J org.metabrick.xbird.xquery.dm.dtm.BigDocumentTable.setTextAt(J[CII)J
J org.metabrick.xbird.xquery.dm.dtm.DocumentTableBuilder.createTextNode()V
J org.metabrick.xbird.xquery.dm.dtm.DocumentTableBuilder.endElement(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
J org.apache.xerces.parsers.AbstractSAXParser.endElement(Lorg/apache/xerces/xni/QName;Lorg/apache/xerces/xni/Augmentations;)V
J org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement()I
J org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Z)Z
j org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Z)Z+24
j org.apache.xerces.parsers.XML11Configuration.parse(Z)Z+132
j org.apache.xerces.parsers.XML11Configuration.parse(Lorg/apache/xerces/xni/parser/XMLInputSource;)V+29
j org.apache.xerces.parsers.XMLParser.parse(Lorg/apache/xerces/xni/parser/XMLInputSource;)V+9
j org.apache.xerces.parsers.AbstractSAXParser.parse(Lorg/xml/sax/InputSource;)V+43
j org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Lorg/xml/sax/InputSource;)V+43
j org.metabrick.xbird.xquery.dm.instance.DocumentTableModel.loadDocument(Ljava/io/InputStream;)V+35
j org.metabrick.xbird.client.tools.command.ImportDocument.process([Ljava/lang/String;)Z+99
j org.metabrick.xbird.client.tools.CommandInvoker.executeCommand([Ljava/lang/String;)Z+8
j org.metabrick.xbird.client.tools.CommandInvoker.run([Ljava/lang/String;)V+66
j org.metabrick.xbird.client.tools.CommandInvoker.main([Ljava/lang/String;)V+19
v ~StubRoutines::call_stub
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x48aa5000 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=3636]
0x48aa0800 JavaThread "CompilerThread0" daemon [_thread_blocked, id=4076]
0x48a9e400 JavaThread "Attach Listener" daemon [_thread_blocked, id=3144]
0x48aac400 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2248]
0x48a86c00 JavaThread "Finalizer" daemon [_thread_blocked, id=2664]
0x48a82800 JavaThread "Reference Handler" daemon [_thread_blocked, id=2700]
=>0x003f6800 JavaThread "main" [_thread_in_Java, id=2968]
Other Threads:
0x48a7f400 VMThread [id=4028]
0x48aa6800 WatcherThread [id=3704]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 72576K, used 28616K [0x029d0000, 0x07890000, 0x07890000)
eden space 64512K, 32% used [0x029d0000, 0x03e6fdd0, 0x068d0000)
from space 8064K, 92% used [0x068d0000, 0x07022230, 0x070b0000)
to space 8064K, 0% used [0x070b0000, 0x070b0000, 0x07890000)
tenured generation total 967936K, used 253073K [0x07890000, 0x429d0000, 0x429d0000)
the space 967936K, 26% used [0x07890000, 0x16fb4788, 0x16fb4800, 0x429d0000)
compacting perm gen total 12288K, used 5879K [0x429d0000, 0x435d0000, 0x469d0000)
the space 12288K, 47% used [0x429d0000, 0x42f8dd08, 0x42f8de00, 0x435d0000)
No shared spaces configured.
Dynamic libraries:
0x00400000 - 0x00423000      C:\Program Files\Java\jdk1.6.0\bin\javaw.exe
0x7c940000 - 0x7c9dd000      C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c931000      C:\WINDOWS\system32\kernel32.dll
0x77d80000 - 0x77e29000      C:\WINDOWS\system32\ADVAPI32.dll
0x77e30000 - 0x77ec1000      C:\WINDOWS\system32\RPCRT4.dll
0x77cf0000 - 0x77d7f000      C:\WINDOWS\system32\USER32.dll
0x77ed0000 - 0x77f17000      C:\WINDOWS\system32\GDI32.dll
0x762e0000 - 0x762fd000      C:\WINDOWS\system32\IMM32.DLL
0x60740000 - 0x60749000      C:\WINDOWS\system32\LPK.DLL
0x73f80000 - 0x73feb000      C:\WINDOWS\system32\USP10.dll
0x77bc0000 - 0x77c18000      C:\WINDOWS\system32\msvcrt.dll
0x7c340000 - 0x7c396000      C:\Program Files\Java\jdk1.6.0\jre\bin\msvcr71.dll
0x6d7f0000 - 0x6da2f000      C:\Program Files\Java\jdk1.6.0\jre\bin\client\jvm.dll
0x76af0000 - 0x76b1b000      C:\WINDOWS\system32\WINMM.dll
0x6d310000 - 0x6d318000      C:\Program Files\Java\jdk1.6.0\jre\bin\hpi.dll
0x76ba0000 - 0x76bab000      C:\WINDOWS\system32\PSAPI.DLL
0x6d7a0000 - 0x6d7ac000      C:\Program Files\Java\jdk1.6.0\jre\bin\verify.dll
0x6d3a0000 - 0x6d3bf000      C:\Program Files\Java\jdk1.6.0\jre\bin\java.dll
0x6d7e0000 - 0x6d7ef000      C:\Program Files\Java\jdk1.6.0\jre\bin\zip.dll
0x6d560000 - 0x6d573000      C:\Program Files\Java\jdk1.6.0\jre\bin\net.dll
0x719e0000 - 0x719f7000      C:\WINDOWS\system32\WS2_32.dll
0x719d0000 - 0x719d8000      C:\WINDOWS\system32\WS2HELP.dll
0x6d580000 - 0x6d589000      C:\Program Files\Java\jdk1.6.0\jre\bin\nio.dll
VM Arguments:
jvm_args: -Xmx1024m -Xms1024m
java_command: org.metabrick.xbird.client.tools.CommandInvoker -col /xmark import document C:\Software\xmark\xmark100.xml
Launcher Type: SUN_STANDARD
Environment Variables:
JAVA_HOME=C:\Program Files\Java\jdk1.6.0
PATH=C:\Program Files\Java\jdk1.6.0\bin;D:\Software\maven-1.0.2\bin;D:\cygwin\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;D:\Software\apache-ant-1.6.5\bin;C:\ghc\ghc-6.4.2\bin;C:\Program Files\QuickTime\QTSystem\
USERNAME=yui
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 4 Stepping 4, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 2
CPU:total 2 family 15, cmov, cx8, fxsr, mmx, sse, sse2, ht
Memory: 4k page, physical 2096404k(108924k free), swap 3511144k(1471688k free)
vm_info: Java HotSpot(TM) Client VM (1.6.0-beta2-b86) for windows-x86, built on Jun 2 2006 00:36:31 by "java_re" with unknown MS VC++:1310

The following is the error that I got with using JDK 1.5.
# An unexpected error has been detected by HotSpot Virtual Machine:
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00b8c9f8, pid=4024, tid=1608
# Java VM: Java HotSpot(TM) Client VM (1.5.0_06-b05 mixed mode)
# Problematic frame:
# J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap$ChainedEntry.recordRemoval(Lorg/metabrick/xbird/util/collections/Int2LongHash;)V
--------------- T H R E A D ---------------
Current thread (0x00036190): JavaThread "main" [_thread_in_Java, id=1608]
siginfo: ExceptionCode=0xc0000005, writing address 0xfa424094
Registers:
EAX=0x00040e40, EBX=0xfa424078, ECX=0x05bd3fc0, EDX=0x05bd3fc0
ESP=0x0007f578, EBP=0x0007f590, ESI=0xfa424078, EDI=0x081c8168
EIP=0x00b8c9f8, EFLAGS=0x00010203
Top of Stack: (sp=0x0007f578)
0x0007f578: 081c1fa8 6d7d1061 022dd1c8 00000000
0x0007f588: 00000200 00000200 0007f5c8 00b8c598
0x0007f598: 0899f428 05bd3fc0 00000200 00000000
0x0007f5a8: 0007f5c8 00b41018 00000200 000001cb
0x0007f5b8: 05c50338 05c19448 05bd3fc0 000001a8
0x0007f5c8: 0007f648 00b8b880 07dd565c 0899f428
0x0007f5d8: 022dd1cb 00000000 08976190 00b8054c
0x0007f5e8: 00001000 0000af89 00001000 6d7d1061
Instructions: (pc=0x00b8c9f8)
0x00b8c9e8: 89 5f 20 c1 e8 09 c6 80 00 a9 6c 48 00 8b 72 20
0x00b8c9f8: 89 7e 1c c1 ee 09 c6 86 00 a9 6c 48 00 8b e5 5d
Stack: [0x00040000,0x00080000), sp=0x0007f578, free space=253k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap$ChainedEntry.recordRemoval(Lorg/metabrick/xbird/util/collections/Int2LongHash;)V
J org.metabrick.xbird.util.collections.Int2LongHash.remove(I)J
J org.metabrick.xbird.util.collections.Int2LongHash$Int2LongLRUMap.addEntry(IIJLorg/metabrick/xbird/util/collections/Int2LongHash$BucketEntry;)V
J org.metabrick.xbird.util.collections.Int2LongHash.put(IJ)J
J org.metabrick.xbird.xquery.util.StringChunk.storeCharChunk([CII)J
J org.metabrick.xbird.xquery.util.StringChunk.store([CII)J
J org.metabrick.xbird.xquery.dm.dtm.BigDocumentTable.setTextAt(J[CII)J
J org.metabrick.xbird.xquery.dm.dtm.DocumentTableBuilder.createTextNode()V
J org.metabrick.xbird.xquery.dm.dtm.DocumentTableBuilder.endElement(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
J com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Lcom/sun/org/apache/xerces/internal/xni/QName;Lcom/sun/org/apache/xerces/internal/xni/Augmentations;)V
J com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanEndElement()I
J com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Z)Z
v ~OSRAdapter
j com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Z)Z+24
j com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Z)Z+118
j com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Lcom/sun/org/apache/xerces/internal/xni/parser/XMLInputSource;)V+29
j com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Lcom/sun/org/apache/xerces/internal/xni/parser/XMLInputSource;)V+9
j com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Lorg/xml/sax/InputSource;)V+43
j org.metabrick.xbird.xquery.dm.instance.DocumentTableModel.loadDocument(Ljava/io/InputStream;)V+35
j org.metabrick.xbird.client.tools.command.ImportDocument.process([Ljava/lang/String;)Z+102
j org.metabrick.xbird.client.tools.CommandInvoker.executeCommand([Ljava/lang/String;)Z+8
j org.metabrick.xbird.client.tools.CommandInvoker.run([Ljava/lang/String;)V+66
j org.metabrick.xbird.client.tools.CommandInvoker.main([Ljava/lang/String;)V+19
v ~StubRoutines::call_stub
V [jvm.dll+0x845a9]
V [jvm.dll+0xd9317]
V [jvm.dll+0x8447a]
V [jvm.dll+0x8b44a]
C [java.exe+0x14c5]
C [java.exe+0x64dd]
C [kernel32.dll+0x16fd7]
--------------- P R O C E S S ---------------
Java Threads: ( => current thread )
0x00aa7490 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=1780]
0x00aa60f0 JavaThread "CompilerThread0" daemon [_thread_blocked, id=3456]
0x00aa53f8 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=2544]
0x00a96c80 JavaThread "Finalizer" daemon [_thread_blocked, id=856]
0x00a957e8 JavaThread "Reference Handler" daemon [_thread_blocked, id=816]
=>0x00036190 JavaThread "main" [_thread_in_Java, id=1608]
Other Threads:
0x0003fbd0 VMThread [id=3592]
0x00ab0e20 WatcherThread [id=3108]
VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap
def new generation total 72576K, used 59965K [0x02ae0000, 0x079a0000, 0x079a0000)
eden space 64512K, 80% used [0x02ae0000, 0x05d8f7b0, 0x069e0000)
from space 8064K, 99% used [0x069e0000, 0x071bfff8, 0x071c0000)
to space 8064K, 0% used [0x071c0000, 0x071c0000, 0x079a0000)
tenured generation total 967936K, used 451270K [0x079a0000, 0x42ae0000, 0x42ae0000)
the space 967936K, 46% used [0x079a0000, 0x23251ab0, 0x23251c00, 0x42ae0000)
compacting perm gen total 8192K, used 5367K [0x42ae0000, 0x432e0000, 0x46ae0000)
the space 8192K, 65% used [0x42ae0000, 0x4301dfb0, 0x4301e000, 0x432e0000)
No shared spaces configured.
Dynamic libraries:
0x00400000 - 0x0040c000      C:\Program Files\Java\jdk1.5.0_06\bin\java.exe
0x7c940000 - 0x7c9dd000      C:\WINDOWS\system32\ntdll.dll
0x7c800000 - 0x7c931000      C:\WINDOWS\system32\kernel32.dll
0x77d80000 - 0x77e29000      C:\WINDOWS\system32\ADVAPI32.dll
0x77e30000 - 0x77ec1000      C:\WINDOWS\system32\RPCRT4.dll
0x77bc0000 - 0x77c18000      C:\WINDOWS\system32\MSVCRT.dll
0x6d6e0000 - 0x6d874000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\client\jvm.dll
0x77cf0000 - 0x77d7f000      C:\WINDOWS\system32\USER32.dll
0x77ed0000 - 0x77f17000      C:\WINDOWS\system32\GDI32.dll
0x76af0000 - 0x76b1b000      C:\WINDOWS\system32\WINMM.dll
0x762e0000 - 0x762fd000      C:\WINDOWS\system32\IMM32.DLL
0x60740000 - 0x60749000      C:\WINDOWS\system32\LPK.DLL
0x73f80000 - 0x73feb000      C:\WINDOWS\system32\USP10.dll
0x6d2f0000 - 0x6d2f8000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\hpi.dll
0x76ba0000 - 0x76bab000      C:\WINDOWS\system32\PSAPI.DLL
0x6d6b0000 - 0x6d6bc000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\verify.dll
0x6d370000 - 0x6d38d000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\java.dll
0x6d6d0000 - 0x6d6df000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\zip.dll
0x6d530000 - 0x6d543000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\net.dll
0x719e0000 - 0x719f7000      C:\WINDOWS\system32\WS2_32.dll
0x719d0000 - 0x719d8000      C:\WINDOWS\system32\WS2HELP.dll
0x6d550000 - 0x6d559000      C:\Program Files\Java\jdk1.5.0_06\jre\bin\nio.dll
VM Arguments:
jvm_args: -Xmx1024m -Xms1024m -ea
java_command: org.metabrick.xbird.client.tools.CommandInvoker -col /xmark import document C:\Software\xmark\xmark100.xml
Launcher Type: SUN_STANDARD
Environment Variables:
JAVA_HOME=C:\Program Files\Java\jdk1.6.0
PATH=C:\Program Files\Java\jdk1.6.0\bin;D:\Software\maven-1.0.2\bin;D:\cygwin\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;D:\Software\apache-ant-1.6.5\bin;C:\ghc\ghc-6.4.2\bin;C:\Program Files\QuickTime\QTSystem\
USERNAME=yui
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 4 Stepping 4, GenuineIntel
--------------- S Y S T E M ---------------
OS: Windows XP Build 2600 Service Pack 2
CPU:total 2 family 15, cmov, cx8, fxsr, mmx, sse, sse2, ht
Memory: 4k page, physical 2096404k(370660k free), swap 3511144k(1545452k free)
vm_info: Java HotSpot(TM) Client VM (1.5.0_06-b05) for windows-x86, built on Nov 10 2005 11:12:14 by "java_re" with MS VC++ 6.0

Running a compiled java file

Question: if a pc doesn't have the jre, how can it launch a compiled java file? For example, i create a program that calculates the expenses of a factory, i create the gui and i compile the file. Then i distribute my program. If a factory doesn't have jre, i suppose it can't launch the program...how can i do? can i create an exe file from java one?

If the machine has a browser, it probably has a jre, but that is beside the point. No it cannot run without a jre. If there is not one, it must be installed.

Converting .java to .exe files to run those without runtime environment

i want to convert my java code to a windows application file so that when ever i have to take it to some place for description, i would not require to install java run time environment. and can show up the working of the code with the help of it..................

Converting a Java application into an exe file
This question is sometimes asked many times on a single day in the comp.lang.java.* newsgroups, and I always end up asking the same question: why do you want to? Most answers fall into one of four categories, and each prompts a different course of action. Most of the time, an exe file isn't actually required.
Reason 1: Speed
"Java is interpreted, so I want to make it native and make it faster." Well, very few modern desktop VMs actually spend much time interpreting Java bytecodes these days. Everyone and their dog has a JIT (Just In Time) compiler which will compile your code into native form before running it. Smart VMs will do this only when appropriate (ie if the code is going to be run more than once, or contains loops etc), and may recompile the code on the fly if the conditions change (eg if a subclass is loaded which invalidates some inlining optimisations, or if the code is run very frequently and therefore merits more aggressive optimisations). The bottom line is that for most applications, Java running on a VM is pretty fast these days. It's usually pretty close to the speed of a natively compiled and similar C/C++ application - certainly I've seen changing compiler (or compiler options) for C/C++ make more difference to speed than going between Java running on a VM and natively compiled Java.
There are some situations where the speed difference is significant. If you're really desperate for that extra bit of performance, try evaluating one of the native compilers listed here with your particular application. Make sure you write some real benchmarks though - vague notions of "feeling faster" may well be down to preconceptions.
Remember, too, that as new VMs come out, they tend to improve performance. That means that to get the best out of your application if it's running on a VM, the user only needs to download a later VM - no action is needed on your part. If they're using your natively compiled code, you'll probably need to recompile on a later version of the native compiler, if one is available.
Reason 2: Being able to open an application by double-clicking on it
If you can ask the user to install a JRE first, executable jar files are the way to go here. They're very simple to set up and use, and it won't cost you any money. See "Jar" in the Java Glossary for further information on how to create an executable jar file.
Reason 3: Not having to distribute a jar file and the JRE
Well, in some form or other, your users will need a runtime environment. Some native code compilers even require you to have a JRE installed as well! Chances are you're not going to be able to create a much smaller download, if that's the worry. However, there are other options here which make it easy to install your application. There's Java Web Start which also includes automatic upgrading of your software, but which will impose some restrictions (a bit like an applet, but slightly less restrictive) unless you sign your application. Alternatively, there are quite a few installers available, some of which are free (or free for personal use). See Installer in the Java Glossary for a list of some of them.
Reason 4: Intellectual property protection
Java byte-code can be decompiled pretty easily, and even obfuscators can only do so much. Here, native compilers really do make a difference. Obviously they won't make your code totally impossible to understand, but it'll be very difficult to get back to Java sources which could be modified and recompiled. The only further question to ask at this stage is whether the downsides of native compilation (eg it being a less-well-used (and therefore likely to be less solid) platform, being expensive etc) are worth the upside of the added protection. In some cases the answer will be yes, in some cases the answer will be no.
What next?
If, after reading through the above, you still want to try a native compiler, you can usually evaluate them before buying them. (Some are free, of course.) There's a list on Marco Schmidt's web-site, along with another view of the pros and cons.
I go the above article in : http://www.yoda.arachsys.com/java/javaexe.html

How does javac compile .java files?

I dont know exactly what classpath javac uses to compile java files. i have set classpath to only tools.jar . and it compiles fine. i thought all standard java class files are present in tools.jar. But... when i opened tools.jar i didnt find most of the class files i expected to see there. In fact there was no java.lang, java.io ... so on packages in it. then how is that compiler compiled ? Of course i found rt.jar under jre/lib, which contained all the mentioned packages...but then i didnt give it in the classpath.
Any body pls clear my doubts.

Check out the doc "how classes are found" in the tool
docs, it will explain how classes are found in
detail.
tool docs:
http://java.sun.com/j2se/1.3/docs/tooldocs/tools.html
I read the docs and understood that javac.exe loads dt.jar before it could compile .java files. but then what is the use of giving tools.jar in classpath.. i ve seen javac giving problems without it.

VB6 source code cannot connect to Oracle database after compile to file.exe

Hi All,
I have a problem about VB6 connect with Oracle database. It can connect as normal when run on VB program. After compiled to file.exe and execute, it cannot connect to Oracle database. What's going on ? Please advise? Thank you.
Here is sample of my code connection.
Option Explicit
Private wsData As New ADODB.Connection
wsData.ConnectionString = _
"Provider=MSDAORA.1;User ID=lsp;Password=lsp2007;Data Source=prd01;Persist Security Info=False"
wsData.Open
End sub
Rgads,
Ats.

Hi,
I believe you're in the wrong forum, this forum is for Oracle Application Express.

Error while running compiled java code

Hi
I have an evaluation license of the JDeveloper2.0 installed on my WindowsNT 4.0 workstation.
I seem to have a problem running my compiled jave code. After compiling the source code(.java file) when I try to run the same I get a message saying
"<FileName> not found in outpath classpath or sourcepath ".
What does this mean and how can I rectify it?
Regards
Sree
null

Your classpath tells Java run time where to look for the class files it needs. In JDeveloper the class path is set in your project properties. Select Project->Properties and check that the source and output paths correspond to your myprojects and myclasses directories.

Error while compiling java file

Hi, im newby in java,
i was trying to compile java files, and after that i will use it in JSP as javabean.
I have 2 files already, the first file is a connection code, and its compiled successfully, it looks like this
i named this as ConnectionBean.java
package my_package;
import java.sql.*;
public class ConnectionBean {
     private Connection con;
     private static final String driver = "org.postgresql.Driver";
     private static final String url = "jdbc:postgresql://localhost:5432/PSQLDS";
     private static final String username = "postgres";
     private static final String password = "mypassword";
     public ConnectionBean() {
     public Connection logOn() {
          try {
               Class.forName(driver); con = DriverManager.getConnection(url, username, password); }
          catch(ClassNotFoundException e) {
               System.err.println("ConnectionBean: driver unavailable..."); con = null; }
          catch (SQLException e) {
               System.err.println("ConnectionBean: driver not loaded..."); con = null; }
          return con;
     public void logOff() {
          try {
               con.close(); }
          catch (Exception e) {
               e.printStackTrace(); }
as you can see above im using "package", and yes i have manage to put all my java files within the correct path (ROOT\WEB-INF\classes\my_package)
And also, i have test this class as javabean on JSP file and it works.
There for i continue to create the second java file, as a purpose to create a back engine for JSP. I use the same package as ConnectionBean.java, it looks like this
i named this as ListPageEngine.java
package my_package;
import java.beans.*;
import java.sql.*;
public class ListPageEngine {
     public static void main(String[] args) {
          ConnectionBean conBean = new ConnectionBean();}
on compiling process using command "javac ListPageEngine.java", i get this error message
ListPageEngine.java:11: cannot find symbol
symbol : class ConnectionBean
location: class my_package.ListPageEngine
ConnectionBean conBean = new ConnectionBean();}
^
ListPageEngine.java:11: cannot find symbol
symbol : class ConnectionBean
location: class my_package.ListPageEngine
ConnectionBean conBean = new ConnectionBean();}
^
2 errors
I think, i am pretty much sure that all my configuration (wheater its Apache TomCat, Environment Variable or PostgreSQL server) was good, as a prove, i was able to use ConnectionBean.class in my JSP file.
I susspect the problem is related with "package", seems i cannot use ConnectionBean class within ListPageEngine class when i use package.
For another information, i didn't install such thing as J2EE, i only install JDK 1.5, i also guess this might be the cause.
Right now im all stuck, i try to find thread which might be related with my problem but i failed to find it, most of them get the same answer by UncleSAM which are
Try the following forum (about JSP technology)
http://forum.java.sun.com/forum.jspa?forumID=45
JavaBeans spec contains nothing about JSP, but JSP spec describes using of beans.
i hope my question is clear so anyone who might have experience or clue with this problem might be able to help me.
Thanks before

finally folks, i found answer to my own problem hehehehe..
the problem is on the compiling command (javac ... my_file.java), i found that i need to add some parameter on the command to make it works.
This problem solved.

Using a Compiled Java Class --- Error

Hi All,
I am new to jsp tech. I am using 'Sun Java system application web server'.
I am getting following error when running ch06_02.jsp :
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
[javac] /nfs/bxslnx/home/bxs/install/SUNWappserver/domains/domain1/generated/jsp/j2ee-modules/__default-web-module-server/org/apache/jsp/jsp/Examples/ch06/ch06_005f02_jsp.java:6: '.' expected
[javac] import ch06_01;
[javac] ^
[javac] 1 error
     org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:88)
     org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:337)
     org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:429)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:489)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:468)
     org.apache.jasper.compiler.Compiler.compile(Compiler.java:456)
     org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:516)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:307)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:251)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
     sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     java.lang.reflect.Method.invoke(Method.java:585)
     org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
     java.security.AccessController.doPrivileged(Native Method)
     javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
     org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
     org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
note The full stack trace of the root cause is available in the Sun-Java-System/Application-Server logs.
My two files are :
ch06_01.java
public class ch06_01
public ch06_01()
public String msg()
return "Hello from JSP!";
ch06_02.jsp
<%@page import="ch06_01" %>
<HTML>
<HEAD>
<TITLE>Using a JavaBean</TITLE>
</HEAD>
<BODY>
<H1>Using a JavaBean</H1>
<% ch06_01 messager = new ch06_01(); %>
The message is: <%= messager.msg() %>
</BODY>
</HTML>
Please help me ....... I don't know whats going wrong . I m using Suse OS.
Thanks
Basant

Hi
You have to place the xml parsing library inside the lib directory under the WTK.
Mihai

Problem compiling java file to access web service! newbie troubles !

I am new to web services and this is my first program...
I am compiling java file which has import statement like:
import org.apache.soap.util.xml.*;
import org.apache.soap.*;
import org.apache.soap.rpc.*;
It says ----- package org.apache.soap.util.xml does not exist as one of errors..
I have a folder that I named soap myself and I have activation.jar,serces.jar,mail.jar,soap.jar in it.
I added c:\soap in my classpath and this was supposed to be the quickstart way to try an example out...
but it gives me compilation errors... what should I do ?

You'll need to specify each jar file in the classpath. c:\soap\xerces.jar;c:\soap\sax.jar;....

How to check the JDK version of a compiled java file

can anybody tell me how to check the JDK version of a compiled java file ?
Edited by: gbhatia8 on Sep 9, 2010 7:04 AM

The major/minor version of the class file is the way to go.
Also, it's not necessary to write a separate program to get to those. javap prints them out when being passed the -v flag.
Note, however that "JDK version" is not a correct term, as I can create 1.4-compatible class files with a Java 6 JDK (by passing the -target flag to javac). Those won't look any different than .class files written with a 1.4 JDK.

Java to exe

Hi Good Morning,
I would like to ask what software that can convert java to exe files for free.
thanks in advance.

yes, BUT.
Maybe something has changed fundamentally since the last time it was asked a few minutes ago that's so secret that only the forum gods know about it yet!
(yes, I actually saw that argument used as justification in the umpteenth thread about which is the "best" IDE some time ago).

Compile Java to exe

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