Can we have a java application with out need of JVM??

Hi
Does java support exe kind of installable like in c/c++( is it platform dependent)?if so who it works??
Can we right an application, which run on any machine (i.e. platform dependent) with out need of JVM installed on that machine�

The short answer is no. A slightly longer answer.
There were attempts to compile Java to native code. I remember playing with such a compiler: TowerJ. If you do this, you will end up with native executables, but not only one. You will have one per platform. Hopefully you will find compilers like this for all platforms (unlikely) or at least to all platforms you expect your application to run on. Compiling Java like this is complex and it may have all kind of restrictions.
Symantec VisualCafe (out of business) now, provided a feature by which you could turn your Java program into a Windows executable. It was a bid executable containing a small native stub, the VM started by the stub, all the JDK classes and all your classes. It was still running under a VM, but this fact was hidden from you. I am pretty sure this concept is alive, just Google for it.
If you drop the requirement "without VM" only to "without user having to install the JRE", you can survive. You can package the Sun VM with your application (legal, but read the conditions) and than install both. The user does not know what you install, the VM is just another component of your application among others that make it work. You do not need an installer for this, a ZIP with all the stuff inside does the trick.
Note that again, you will need to create separate installers/zips for every platform supported, because the JRE part is not the same.

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HI
chec this link
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HIH
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Class c = null;
Class cArr[] ;
Method md = null;
Object mArr[];
cl = ClassLoader.getSystemClassLoader();
try{
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} catch(ClassNotFoundException e) {
System.out.println(e);
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     System.out.println(e);
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The short answer is no. A slightly longer answer.
There were attempts to compile Java to native code. I remember playing with such a compiler: TowerJ. If you do this, you will end up with native executables, but not only one. You will have one per platform. Hopefully you will find compilers like this for all platforms (unlikely) or at least to all platforms you expect your application to run on. Compiling Java like this is complex and it may have all kind of restrictions.
Symantec VisualCafe (out of business) now, provided a feature by which you could turn your Java program into a Windows executable. It was a bid executable containing a small native stub, the VM started by the stub, all the JDK classes and all your classes. It was still running under a VM, but this fact was hidden from you. I am pretty sure this concept is alive, just Google for it.
If you drop the requirement "without VM" only to "without user having to install the JRE", you can survive. You can package the Sun VM with your application (legal, but read the conditions) and than install both. The user does not know what you install, the VM is just another component of your application among others that make it work. You do not need an installer for this, a ZIP with all the stuff inside does the trick.
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Getting notification back to java application with Goldengate

Hello,
I am new to using Golden Gate. I have a java application running in an application server environment using Oracle database. We plan to use Goldengate to receive data directly in the database from external database. I have few questions in using goldengate:
1. Is there a way for my application to know that database change to a table has happened?
2. I came across goldengate and jms notification. Is there a non-jms way using java API for my application to know real-time that change has happened to database table?
3. Are there any samples for this type of feature?
Thank you.

There is a Java API that can be used directly, rather than just using the built-in JMS delivery.
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Note: GoldenGate only captures committed transactions, so you won't ever receive rolled back database transactions; however , there may be "interruptions" in the GG trail if/when a GG process abends & restarts. This puts a virtual "rollback" into the trail (technically, it's a restart/abend marker) which a GG replicat fully understands. The GG user-exit API prior to v11.2 does not pass RestartAbend events to any user-exits -- including the Java adapter. Long story short, your source "extract" (the one capturing changes from the source DB) must create trails with the "Format Release 9.5" qualifier, or (equivalently) specify "RecoveryOptions OverwriteMode". If you do this, then there will be no "restart/abend" markers in the trail. However, under certain (odd) circumstances, it may not be entirely possible to create trails in this format. The format 10+ trails (aka "RecoveryOptions AppendMode") are slightly more resilient to system failures, and do have additional file header info that is not available in "format 9.5" trails. Although GG 11.2 is available, the user-exits (the Java adapter & flat-file writer) that use this new API are presently not yet generally available.
Ok, with the caveats out of the way, here's a code sample:
package tst;
import com.goldengate.atg.datasource.*;
import com.goldengate.atg.datasource.GGDataSource.Status;
public class HelloWorldHandler extends AbstractHandler {
private long numTxs = 0;
private long numOps = 0;
private long numCols = 0;
@Override
public Status operationAdded(DsEvent e, DsTransaction tx, DsOperation operation) {
    super.operationAdded(e, tx, operation);
    numOps++;
    numCols += operation.getNumColumns();
    return Status.OK;
@Override
public Status transactionCommit(DsEvent e, DsTransaction tx) {
    super.transactionCommit(e, tx);
    numTxs++;
    return Status.OK;
@Override
public String reportStatus() {
    String s = "Processed (mode='" + getMode() + "')" + " transactions=" + numTxs
              + ", operations=" + numOps + ", columns=" + numCols;
    return s;
}That's about as basic as it gets. It will print out number of operations processed to the report file (dirrpt/*.rpt). The Java user-exits typically are an "end point" for the data stream (that's what the "CuserExit... PassThru" option means), so this example isn't terribly useful by itself. Typically you would send the data somewhere else (like the JMS handler, or a file-writer) or update some other system with these events.
Btw, there are also a few helper classes to merge metadata (column/table names) and data (column "before" and "after" data). The "DsTransaction" and "DsOperation" and "DsColumn" classes are just "data". The following wrapper classes also provide metadata (Tx, Op, Col):
import com.goldengate.atg.datasource.adapt.*;
Tx tx = new Tx(dsTransaction, getMetaData(), getConfig());
//or: Op op = new Op(dsOperation, tableMeta, getConfig());
     for(Op op: tx) {
          for(Col c: op) { ... }
}See the javadoc that comes with the software download for details (javadoc.zip).
To compile and use (preferably creating a jar; I'm assuming you put it in "dirprm" (see below)):
$ javac -d classes -cp {gg_home}/ggjava/ggjava.jar HelloWorldHandler.java
$ jar -cvf myCustom.jar ...etc...Your extract ("pump") parameter file that loads and runs your custom Java user-exit event handler:
Extract javaue
SourceDefs dirdef/tc.def
SetEnv ( GGS_USEREXIT_CONF = "dirprm/javaue.properties" )
GetEnv (JAVA_HOME)
GetEnv (LD_LIBRARY_PATH)
-- CUserExit ggjava_ue.dll CUSEREXIT PassThru IncludeUpdateBefores
CUserExit libggjava_ue.so CUSEREXIT PassThru IncludeUpdateBefores
GetUpdateBefores
-- must pass all data to user-exit, or
-- else tx indicators might be missed
TABLE GGS.*;
TABLE EXAMPLE.*;And the referenced properties file could look like the following. There are really two parts to this file; the first part is used to configure the Java application, the second is used to configure the JNI bridge between the JVM and "extract".
# Java application properties
gg.handlerlist=mytest
# your custom event handler.
# note: setting property foo=bar automatically calls your handler's method setFoo("bar")
gg.handler.mytest.type=tst.HelloWorldHandler
gg.handler.mytest.foo=bar
gg.handler.mytest.mode=op
# gg.handler.mytest.mode=tx
# Properties for native library ("C" User Exit)
# set to TRUE to *disable* the duplicates-checkpoint-file
goldengate.userexit.nochkpt=TRUE
# duplicates-checkpoint-file prefix
goldengate.userexit.chkptprefix=JAVAUE_
# tx timestamp datatbase local (default) or UTC timestamp
goldengate.userexit.timestamp=utc
# C-user-exit logging config for native library *only*.
# Java app uses log4j config in javawriter.bootoptions.
goldengate.log.modules=TXSTORE,JAVAWRITER,JAVAUSEREXIT
goldengate.log.level=INFO
goldengate.log.tostdout=false
goldengate.log.tofile=true
# prefix for native library logfile name
goldengate.log.logname=cuserexit
goldengate.userexit.writers=javawriter
# native lib statistics, defaults: time=3600, numrecs=10000
#   display=false (doesn't write to file)
#   full=false (would not include java report)
javawriter.stats.time=3600
javawriter.stats.numrecs=100
javawriter.stats.display=TRUE
javawriter.stats.full=TRUE
# Set classpath to required jars.
#    Use ':' path separator for Unix, ';' for windows.
# Set the log4j configuration -- note this found in the classpath.
#    See the example preconfigured log4j files in ggjava/resources/classes,
#    copy to dirprm and rename, then customize as desired. (Don't put or
#    modify files in the ggjava/* directory.)
javawriter.bootoptions=-Xmx64m -Xms32m -Djava.class.path=dirprm:ggjava/ggjava.jar:dirprm/myCustom.jar -Dlog4j.configuration=log4j.propertiesNote that the property "bootoptions" includes "myCustom.jar" to find your class. You can use your custom log4j config as well (e.g., my-log4j.properties); put it in "dirprm" as well and it will be found in the classpath.
See also the GoldenGate Java docs for a little more on this topic:
* http://www.oracle.com/technetwork/middleware/goldengate/documentation/index.html => http://docs.oracle.com/cd/E18101_01/index.htm
Hope it helps,
-Michael
Edited by: MikeN on Jun 20, 2012 10:34 PM - notes on trail format compatibility

How can i built a java application using java debug class on Log4J

Hi,
As java API support the MethodEntryEvent, using which I can get the automatic logging statements when the method is entered or exited as HelloExample.main(with argument type).
Where HelloExample is the class name.
Main is the method entered with its argument types.
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-- VM Started --
====== main ======
main -- HelloExample
callerMethod -- HelloExample
====== main end ======
-- The application exited --
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Thanks & Regards,

hi,
can someone help me how to implement logging for method entry parameters and
method exit return value.
can someone help me how to use log4j and integrate it to the method entry
logging and method exit logging.
Here what i need is without writing the log statements for the method entry and
method exit i need to log it to the file
along with other log4j debug statements i provide in the file.I should be able
to configure whether to enable/disable the logging
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parameters the method take and in method exit
i should be able to log te return value to the log file, before the method is
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i hope i am clear
Thanks in advance.

Profiling a java application with HPjmeter

I have a java application and i want to identify the performance problems .
I'm doing a static analyze and a dinamic analyze.
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Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0.03-_13_feb_2006_16_39)
Java HotSpot(TM) Server VM (build 1.5.0.03 jinteg:02.13.06-15:51 PA2.0 (aCC_AP), mixed mode)
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Can we have a java application with out need of JVM??

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