How to visualize java bytecode?

Hey guys
I'm here again with another question for you.
That you know, is there a way to visualize and see the bytecode of a program in Java? if yes can you please tell me how to do this?
Thanks in advance.
Maddy

I dont think u can insert anything into to a .class file.So not true. How do javac, jikes, jasmin and several other compilers / translators work then?
There are several APIs for doing that. Check the link I gave. And this: http://directory.google.com/Top/Computers/Programming/Languages/Java/Class_Libraries/Data_Formats/Java_Class_Files/
CafeBabe is a graphical tool but it is far from finished right now: http://jfa.javalobby.org/projects/CafeBabe.html
I'm sure there are lots of others... I was browsing the 'net the other day and became momentarily intressed in this. I found a myriad of different tools - even graphical ones - but I can't seem to be able to find them now :(
infact as far as i know, even if u delete a char and retype the same char the verifier will complain.If you use a text editor, of course. The different character encodings and null bytes mix things up pretty badly, you know... You can't even open and save an casual GIF file in Notepad so that the result will be valid GIF!

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http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html
I personally use BCEL to manipulate class files.
http://jakarta.apache.org/bcel/
Some report they prefer Soot.
http://www.sable.mcgill.ca/soot/

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Since my zwebsite is already using Java 1.1 for 3D visualization I've decided to standardize on Java 1.1 to gain maximum browser compatibility. To add another technology like Flash at this point may just complicate matters, especially for me.
I'm now converting my Swing GUI to AWT. It wastes a lot of time, but the effort should be worth it in terms of the deployment success rate - in theory at least :-)
Just imagine if Java 1 had Swing . . . dream on!
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Regarding the use of Java for content rich dynamic content for world world wide web browser deployment . . . I'm rather disillusioned at this point. It seems for this application Java is stuck indefinitely at Java1 and the cool things they developed after that cannot be used effectively. Please note that I am ONLY referring to wide browser deployment. For stand-alone apps and targeted web deployment (where you can reasonably expect your user to upgrade his/her system for a good reason) Java is still very cool.
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HI,
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We intend that this specification should sufficiently document the Java Virtual Machine to make possible compatible clean-room implementations. Sun provides tests which verify the proper operation of implementations of the Java Virtual Machine.
Sun's JVM is called HotSpot. Clean-room Java implementations include Kaffe and IBM's. Sun retains control over the Java trademark, which it uses to certify implementation suites as fully compatible with Sun's specification
we have two caches JAVA,ABAP.
i mean all objects which will execute in JAVA Cache those need the JVM.
Regards
Chilla

Java ByteCode

Hi guys,
I have some questions about java bytecode..
1-java bytecode is cointained in the .Class file,that is autogenerated by Ecliplse(the ide I'm using) or by javac.
I need to extract the bytecode from a .class file,and actually I'm using this piece of code :          //leggo il codice dal file java e lo memorizzo come byte
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2-Then my program will serialize and send through TCP socket the bytes loaded from the .class.The receiver need to create an instance of the .class received...how do I do this...(note that I know the name of the class)?
Thanks a lot guys...BYE!--JAVA ROCKS

1. Looks okay.
2. Create a suitable subclass of ClassLoader. The API doc for it is reasonable helpful.

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How to use java source in Oracle when select by sqlplus.
I can create java source in Oracle
import java.util.*;
import java.sql.*;
import java.util.Date;
public class TimeDate
     public static void main(String[] args)
public String setDate(int i){
GregorianCalendar calendar = new GregorianCalendar();
calendar.setTime(new Date((long)i*1000));
System.out.println("Dateline: "
+ calendar.get(Calendar.HOUR_OF_DAY) + ":"
+ calendar.get(Calendar.MINUTE) + ":"
+ calendar.get(Calendar.SECOND) + "-"
+ calendar.get(Calendar.YEAR) + "/"
+ (calendar.get(Calendar.MONTH) + 1) + "/"
+ calendar.get(Calendar.DATE));
String n = calendar.get(Calendar.YEAR) + "/" + (calendar.get(Calendar.MONTH) + 1) + "/" + calendar.get(Calendar.DATE);
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I have table name TEST
ID DATE_IN
1 942685200
2 952448400
When I write jsp I use method setDate in class TimeDate
The result is
ID DATE_IN
1 1999/11/16
2 2003/7/25
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How to use java programe in oracle form

Hello Expert,
My Config is : -
Forms [32 Bit] Version 11.1.1.3.0 (Production)
Jdeveloper - 10.1.3
I want to use the java programe in form builder. I create the one java class in Jdeveloper -
package demo;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
public class get_info{
   public static void main(String[] args){
   ch_add();
   public static void ch_add()
InetAddress ip;
try {
ip = InetAddress.getLocalHost();
/*System.out.println("Current IP address : " + ip.getHostAddress()); */
NetworkInterface network = NetworkInterface.getByInetAddress(ip);
byte[] mac = network.getHardwareAddress();
/*System.out.print("Current MAC address : ");   */
StringBuilder sb = new StringBuilder();
for (int i = 0; i < mac.length; i++)
sb.append(String.format("%02X%s", mac[i], (i < mac.length - 1) ? "-" : ""));
System.out.println(sb.toString());
} catch (UnknownHostException e) {
e.printStackTrace();
} catch (SocketException e){
e.printStackTrace();
and this into Formweb.cfg and default.env and also add into Form_class_path. After that i import this java into forms.
Code genertated -
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
Now i want to call the o/p of Java programe in oracle text item. Please help me. It's very urgent. I am not good in Java.

Sir i use java importer.
PACKAGE BODY get_info IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args   JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN (JNI.NEW_OBJECT('demo/get_info', '()V', args));
END;
-- Method: main ([Ljava/lang/String;)V
PROCEDURE main(
    a0    ORA_JAVA.JARRAY) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, '[Ljava/lang/String;');
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'main', '([Ljava/lang/String;)V', args);
END;
-- Method: ch_add ()V
PROCEDURE ch_add IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(TRUE, NULL, 'demo/get_info', 'ch_add', '()V', args);
END;
-- Method: wait (J)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(J)V', args);
END;
-- Method: wait ()V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '()V', args);
END;
-- Method: wait (JI)V
PROCEDURE wait(
    obj   ORA_JAVA.JOBJECT,
    a0    NUMBER,
    a1    NUMBER) IS
BEGIN
    args := JNI.CREATE_ARG_LIST(2);
    JNI.ADD_LONG_ARG(args, a0);
    JNI.ADD_INT_ARG(args, a1);
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'wait', '(JI)V', args);
END;
-- Method: equals (Ljava/lang/Object;)Z
FUNCTION equals(
    obj   ORA_JAVA.JOBJECT,
    a0    ORA_JAVA.JOBJECT) RETURN BOOLEAN IS
BEGIN
    args := JNI.CREATE_ARG_LIST(1);
    JNI.ADD_OBJECT_ARG(args, a0, 'java/lang/Object');
    RETURN JNI.CALL_BOOLEAN_METHOD(FALSE, obj, 'demo/get_info', 'equals', '(Ljava/lang/Object;)Z', args);
END;
-- Method: toString ()Ljava/lang/String;
FUNCTION toString(
    obj   ORA_JAVA.JOBJECT) RETURN VARCHAR2 IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_STRING_METHOD(FALSE, obj, 'demo/get_info', 'toString', '()Ljava/lang/String;', args);
END;
-- Method: hashCode ()I
FUNCTION hashCode(
    obj   ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_INT_METHOD(FALSE, obj, 'demo/get_info', 'hashCode', '()I', args);
END;
-- Method: getClass ()Ljava/lang/Class;
FUNCTION getClass(
    obj   ORA_JAVA.JOBJECT) RETURN ORA_JAVA.JOBJECT IS
BEGIN
    args := NULL;
    RETURN JNI.CALL_OBJECT_METHOD(FALSE, obj, 'demo/get_info', 'getClass', '()Ljava/lang/Class;', args);
END;
-- Method: notify ()V
PROCEDURE notify(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notify', '()V', args);
END;
-- Method: notifyAll ()V
PROCEDURE notifyAll(
    obj   ORA_JAVA.JOBJECT) IS
BEGIN
    args := NULL;
    JNI.CALL_VOID_METHOD(FALSE, obj, 'demo/get_info', 'notifyAll', '()V', args);
END;
BEGIN
NULL;
END;
I read both document which is given by you.
Basicaly i don't know how to call java program in form builder.
I wrote this code on When-button-pressed
DECLARE
jo ora_java.jobject;
rv varchar2(1500);
ex ora_java.jobject;
BEGIN
jo := get_info.new;
rv:=get_info.ch_add(jo );
EXCEPTION
WHEN ORA_JAVA.JAVA_ERROR then
message (' Unable to call out to Java, ' ||ORA_JAVA.LAST_ERROR );
message('');
WHEN ORA_JAVA.EXCEPTION_THROWN then
ex := ORA_JAVA.LAST_EXCEPTION;
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
message(' Unable to call out to Java ' ||Exception_.toString (ex ) );
END;
No error comes and no output comes. I want the client MAC ID. please guide me where i need to change the code.

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Hi Experts,
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DATA:command TYPE string VALUE 'D:Javajdk1.6.0_20 injavac',
parameter TYPE string VALUE 'D:java MyFirstProgram'.
CALL METHOD cl_gui_frontend_services=>execute
EXPORTING
application = command
parameter = parameter
OPERATION = 'OPEN'
EXCEPTIONS
cntl_error = 1
error_no_gui = 2
bad_parameter = 3
file_not_found = 4
path_not_found = 5
file_extension_unknown = 6
error_execute_failed = 7
OTHERS = 8.
Thanks.

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How to solve 'java/lang/OutOfMemoryError' when apply weblogic patch 10.3.6.0.10?

Hi All: Our platform is IBM AIX power system 64 bit, os level 6. Oracle Fusion Middleware version is 10.3.6.0.8. We tried to patch 10.3.6.0.10 on it, but encounter ‘out of memory error’ when applied WebLogic patch 10.3.6.0.10 on UAT report server. Currently UAT has 3GB memory (currently is 3G) .
JVMDUMP006I Processing dump event "systhrow",
detail "java/lang/OutOfMemoryError
JVMDUMP032I JVM requested Heap dump using
'/ora_bin01/u01/oracle/Middleware/utilhd' in response to an event
JVMDUMP010I Heap dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/heapdump.20150224.152727.6422620.0001.phd
JVMDUMP032I JVM requested Java dump using
'/ora_bin01/u01/oracle/Middleware/utils/bsu/javacore.20150224.152727.6422620.0002.txt'
in response to an event
JVMDUMP010I Java dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/javacore.20150224.152727.6422620.0002.txt
JVMDUMP032I JVM requested Snap dump using
'/ora_bin01/u01/oracle/Middleware/utils/bsu/Snap.20150224.152727.6422620.0003.trc'
in response to an event
JVMDUMP006I Processing dump event "systhrow",
detail "java/lang/OutOfMemoryError" - please wait.
JVMDUMP010I Snap dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/Snap.20150224.152727.6422620.0003.trc
JVMDUMP013I Processed dump event "systhrow",
detail "java/lang/OutOfMemoryError".
JVMDUMP032I JVM requested Heap dump using
'/ora_bin01/u01/oracle/Middleware/utils/bsu/heapdump.20150224.152735.6422620.0004.phd'
in response to an event
JVMDUMP010I Heap dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/heapdump.20150224.152735.6422620.0004.phd
JVMDUMP032I JVM requested Java dump using
'/ora_bin01/u01/oracle/Middleware/utils/bsu/javacore.20150224.152735.6422620.0005.txt'
in response to an event
JVMDUMP010I Java dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/javacore.20150224.152735.6422620.0005.txt
JVMDUMP032I JVM requested Snap dump using
'/ora_bin01/u01/oracle/Middleware/utils/bsu/Snap.20150224.152735.6422620.0006.trc'
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com.bea.cie.common.dao.xbean.XBeanDataHandler.getSimpleValue(XBeanDataHandler.java:431)
at
com.bea.plateng.patch.dao.cat.PatchDependency.getRule(PatchDependency.java:48)
at
com.bea.plateng.patch.dao.cat.PatchCatalogHelper.getInvalidatedPatchMap(PatchCatalogHelper.java:1625)
at com.bea.plateng.patch.PatchSystem.updatePatchCatalog(PatchSystem.java:436)
at
com.bea.plateng.patch.PatchSystem.refresh(PatchSystem.java:130)
at
com.bea.plateng.patch.PatchSystem.setCacheDir(PatchSystem.java:201)
at
com.bea.plateng.patch.Patch.main(Patch.java:281)
JVMDUMP010I Snap dump written to
/ora_bin01/u01/oracle/Middleware/utils/bsu/Snap.20150224.152735.6422620.0006.trc
JVMDUMP013I Processed dump event "systhrow",
detail "java/lang/OutOfMemoryError".
Exception in thread "Attach API wait loop"
java.lang.OutOfMemoryError
at
com.ibm.tools.attach.javaSE.CommonDirectory.waitSemaphore(CommonDirectory.java:222)
at
com.ibm.tools.attach.javaSE.AttachHandler$WaitLoop.waitForNotification(AttachHandler.java:329)
at com.ibm.tools.attach.javaSE.AttachHandler$WaitLoop.run(AttachHandler.java:396)
bsu.sh -install -patch_download_dir=/ora_bin01/u01/oracle/Middleware/utils/bsu/cache_dir -patchlist=12UV -prod_dir=/ora_bin01/u01/oracle/Middleware/wlserver_10.3
we followed the README.txt instructions, and stop/start weblogic service before/after apply patch. Can anyone suggest a solution or Doc ID for helping us?
thank you very much!

Solutions: Bounce the applications and check the arguments if you can increase it. It is due to memory issue
You can set these values in CommEnv.sh (.cmd for windows) file located in the weblogic_home/common/bin directory.
This gets applied to all the domains under that wls home.
If you want to make the changes to specific domain then edit the SetDomainEnv.sh file located under the domain/bin directory.
How to solve java.lang.OutOfMemoryError: Java heap space
solutions: export JVM_ARGS="-Xms1024m -Xmx1024m"
How to solve java.lang.OutOfMemoryError: PermGen space
solution : export JVM_ARGS="-XX:PermSize=64M -XX:MaxPermSize=256m"

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Deanwdd wrote:
I mean to update Quicktime for Mac Os X 10.6.8...
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Hi all,
I need to access java class (abstract portal component) method doContent() in a JSP which is under PORTAL-INF/jsp folder.
I did
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Till this time, it is working. no errors. But when I do
a.
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Hi Experts,
please help me ,
How TO Use Java Mapping In XI?
Thanks
Mahesh

Hi,
Just refer the following links for java mapping:-
1./people/thorsten.nordholmsbirk/blog/2006/08/10/using-jaxp-to-both-parse-and-emit-xml-in-xi-java-mapping-programs
2./people/alessandro.guarneri/blog/2007/03/25/xi-java-mapping-helper-dom
Regards,
Ashwin M
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