Hot code replacement

How do I do hot code replacement in Eclipse? I tried to write another line while debugging the code, but I got the warning message about the obsolete methods in stack.

I didn't write a new method to replace a method.
Suppose that I have set a breakpoint at
System.out..println("hi"), debug it, and then change
the number 2 to 3 and save it, then I want this code
to work well. It did show a pop up dialog explaining
about obsolete methods.
What does it mean?
     public void testSomething() {
          System.out.println("hi");If you set a breakpoint here. This method was on stack and when you
did hot code replacement and this method "testSomething" becomes
obsolete method. And it will not execute the new modified statement.
To make the new replaced code to execute you should pop this
frame and continue. Or set a breakpoint at line before entering
this method and then do hot code replacement.
          System.out.println("2");
Thanks.

Similar Messages

Hot Code Replace Problem...

Hi Everyone,
I am using WebLogic 10 with Eclipse. Whenever i start the server in debug mode and make two three changes in the code... WHAM.... I get the Hot Code Replace error. Is there any way so that the server can keep up with the code changes. Publishing the app again takes approx 40 mins!

Almost always this is a limitation of the JRE/JDK you are using and really
nothing to do with Eclipse.
Try a different VM and see if you have better luck
HTH
Darins
"bobz" <[email protected]> wrote in message
news:75257188f239cb376da31e19b214d2d9$[email protected]..
> hi buddies,
>
> i am getting "hot code replace" problem whenever i change my
> java code and build the project and access the website without re-starting
> the server. so, finally i endup with re-starting the server whenever i
> change the code. this consumes a lot of time. is there any possibility to
> work without re-starting the server even after the code change.
>
> regards,
> satish.

Hot code replacement for local application?

i got hot code replacement working during debugging a removet web application (servlet). however, it doesn't work if i debug a simple (local) application. is there something i forgot to setup? (i'm using Eclipse)

This is an eclipse specific question. It is up to Eclipse to do the code replacement.
Have you tried 3.0-M8 ?

Websphere setting for Hot code replace

hi ,
these days i need to build my code everytime i make changes ...
previously it was working well ......
i went thru some changes in env .....as there were new addition of MDBs etc in my projects .....
i m using WSAD 5.1.2 .......
i have checked the option we get on server for hot code replace feature ...
is there any other thing i can try ???

-Xj9

REG : HOT CODE REPLACE FAILED

Hi,
I am able to build and deploy and it says deployment is successfull from IDE. But when i tried to write some new code into my application or debug it,I am getting the error message saying:
"Java HotSpot(TM) Server VM{PSC-PC11741:500021](may be out of synch) was unable to replace the running code with the code in the work space.
Reason:
Hot code replace failed - VM may be inconsistent
Anybody has faced this problem?
Please let me know if you have faced this problem.
Regards,
Anu

Synched and Rebuild it .Created a new activity after reverting back the tasks done before.

Hot code replace failed - Delete method not implemented

I debug my Java application with Eclipse (3.1). When I change my code during debugging, I get the following error message:
...MyApp at localhost:4540 (may be out of synch) was unable to replace the running code with the code in the workspace.
Reason:
Hot code replace failed - Delete method not implemented
What does that mean and how can I fix this?

This means you changed a class while it was debugging an application and it could not update the class for the application while it was running.
The error suggests you may be running an older JVM, i.e. pre-1.4.2 but this error can occur with any JVM if the change is incompatible with the previous version of the class.
The hot replace often does not work for non trivial changes to code.

Hot Code replace failed- VM inconsistent

When i am trying to deploy the application on WAS through NWDS, it is throwing Hot Code replace failed- VM inconsistent.
Please give your input.
thanks,

Hi,
> It ask me for SDM password, than it throws the error out.
I do not really understand why the SDM password should be checked for debugging...
(Double-)Check the WD-Debugging infos here: http://help.sap.com/saphelp_nw04/helpdata/en/cc/9cb34d9d11f74c98644df2b96b90f1/frameset.htm
And check for standard HotCodeReplacement issues this for example: NetWeaver Portal Debugging - 2, HotSwap your classes
Maybe putting this question within the WD forum could bring out more...
Hope it helps
Detlev

Hot code replace failed-VM may be inconsistent

Java HotSpot(TM)Server VM(micserver:50021)(may be out of synch)
was unable to replace the running code with the code in the
workspace
Reason:
Hot code replace failed-VM may be inconsistent
i face the following message and the code keep on retain to the old code.
this cause me have the debugging problem

Hi Yzme,
This happens since you save the changes to your code which is being debugged and your debugger session is still ON.
To avoid this close your debugger before making any changes to your code.
Regards,
Shubham

Hotswap und Hot Code Replacement

I start a Java application which has a certain classpath in the start parameter -cp.
If a certain class has been loaded by that application, I cannot hotswap it. Why not? It seems that Java caches that class and uses it all the time, no matter if I replace it.
The only way for me is to stop the application and to start it again. But since it is a big application, this takes too much time. So I wanted hotswap for Java class files.
I don't need it for debugging. Just for normal development with Java 1.4.2.
Any idea how to solve it?

Another, more usually used, way to reload classes is using a custom classloader. I'd probably try to use a custom classloader rather than HotSwap if possible. I'm a bit unsure about using a debugging interface for doing production stuff. At least I'd first google to try to find success stories or examples of using HotSwap for that. Maybe I'm just a traditionalist scared of the new and unknown...
To reload classes loaded by a custom classloader, simply discard the classloader (stop having a pointer to it) and create a new classloader object. Google for "custom classloader" to find examples.

Error in my CODE- replace data in html tags in APPLET

MY REQUIREMENT:
I'm trying to send html format of output to an excel file....As you can see my data in the td tag had data as:
BRANCHOFFICE<125 & BRANCHOFFICE>176 where < is interpreted as an html tag....So I want to replace
< -> <
< -> >
& -> &
<HTML>
<table border="1">
<tr>
<td>BRANCHOFFICE<125 & BRANCHOFFICE>176</td>
</tr>
</table>
</HTML>
MY ERROR IN CODE:
So I'm testing my replace method in a small snippet.........
So the steps my code works is:
1)BRANCHOFFICE<125 & BRANCHOFFICE>176 gets converted to
BRANCHOFFICE<125 & BRANCHOFFICE>176
2)BRANCHOFFICE<125 & BRANCHOFFICE>176 gets converted to
BRANCHOFFICE<125 & BRANCHOFFICE>176
3)when it comes to the third & conversion it goes to a infinte loop....
CAN U PLS HELP ME TO SOLVE THIS BUG........
import java.applet.Applet;
import java.io.*;
public class escape
public static void main(String arg[])
String s1 = "BRANCHOFFICE<125 & BRANCHOFFICE>176";
System.out.println("s1 = " + escape(s1));
private static String escape(String s)
while( true )
int index = s.indexOf('<');
if ( index != -1 )
String before = s.substring( 0, index );
String after = s.substring( index+1, s.length() );
s = before + "<" + after;
continue;
index = s.indexOf('>');
if ( index != -1 )
String before = s.substring( 0, index );
String after = s.substring( index+1, s.length() );
s = before + ">" + after;
continue;
index = s.indexOf('&');
if ( index != -1 )
String before = s.substring( 0, index );
String after = s.substring( index+1, s.length() );
s = before + "&" + after;
continue;
break;
return s;
}

Jdk 1.4:import java.applet.Applet;
import java.io.*;
public class escape
     public static void main(String arg[])
          String s1 = "BRANCHOFFICE<125 & BRANCHOFFICE>176";
          System.out.println("s1 = " + escape(s1));
     private static String escape(String s)
          s = s.replaceAll ("&", "&");
          s = s.replaceAll ("<", "<");
          s = s.replaceAll (">", ">");
          return s;
}<= Jdk 1.3:import java.applet.Applet;
import java.io.*;
public class escape
     public static void main(String arg[])
          String s1 = "BRANCHOFFICE<125 & BRANCHOFFICE>176";
          System.out.println("s1 = " + escape(s1));
     private static String escape(String s)
          s = replace (s, "&", "&");
          s = replace (s, "<", "<");
          s = replace (s, ">", ">");
          return s;
     private static String replace(String original, String find, String replacement) {
          int i=0;
          if ((i=original.indexOf(find)) > -1) return original.substring(0, i) + replacement
               + replace(original.substring(i+find.length()), find, replacement);
          else return original;
}

Procedural ABAP refactoring or mass source code replacement

I am trying to change hard coded values from multiple source codes with respective constant names. Is there a tool to find and replace them according to a rules table. I wouldn't mind even if this tool was not in SAP (eg. Eclipse).
Thank you in advance,
Michalis.

Dear Thomas,
thank you for your prompt response.
My idea was (and is) that since the ABAP compiler is embedded in Netweaver, it would be smart to get the compiler functionality together with regular expressions declaration in order to do what unix like systems do for years, replace strings with other strings. The program you suggest is well known for finding literals (substrings) in source, but when it does you never know what is the role of the literal on the source code line (in the particular code statement).
Of course I agree with you regarding the term refactoring, that a human eye is needed, if I was to do real source code pattern recognition and replacement, but my driving need is more simple and way far from that (at least for now).
Please keep me posted in case you have any news on the subject.

Abap code :replace the bank values of Dataefield to 20990101

Please correct my abap code I am just trying to replace the bank values of Dataefield to 20990101 but i am getting the error invalid dataformat '00000000 '. Please correct my IF statement so that I can get this resolved
IF SOURCE_FIELDS-DATETO = '00000000 '
RESULT = '20990101'.
ENDIF.
Thanks'
Soniya

Hi ,
take the Result should be date data type.
Data : Dateto type sy-datum,
Result type sy-datum.
IF SOURCE_FIELDS-DATETO = '00000000 '
RESULT = '20990101'.
EndIF.
I hope it resolved.
If helpful , plz rewards it.
Regards,
Vishvesh.

Eclipse Maven Weblogic hot code swap

I have a basic question about running a JEE application on Weblogic using maven in eclipse. I use OEPE (Oracle Enterprise pack for Eclipse) that we know comes with some plugins such as m2e and wtp. As far as I know this plugins read the pom file and based on them build the jar, war and ear files. What I do right now is like this: I check the build automatically option and let these plugins create my EAR file, then right click on the instance of weblogic server in Eclipse and add it to server using add/remove option and finally start the application server. This way when I change code in my classes they will be picked by application server and hot swap works. Another way to build the EAR file is using the m2e plugin: right click on the parent pom file and choose maven install then start the application server and use the wls:deploy in order to deploy the EAR file. (This time I don't add the ear file to the application server from within the Eclipse and eclipse also is not aware of that EAR file when I right click on the instance of my weblogic inside the IDE). As far as I've seen I can only add those artifacts to server which are built using the wtp plugin and not the artifacts that are built using maven command of m2e plugin. The problem with wtp and all these plugins (except for m2e which actually just runs mvn -install) is that they don't work flawlessly. Sometimes they don't build the artifacts correctly sometimes the jar files are obsolete and they don't get updated. Moreover when you use the jar file of one project in another maven project they get stuck with the jar file prior to your changes, while using the m2e they are built flawlessly. Now here is the real question: Which way is the correct one to have hot deploy? Am I missing something? Is building the ear file using m2e plugin and deploying using wls:deploy enough? If so how will hot swap happen by itself or should i use wls:redeploy each time? If m2e is enough then I assume that I should abandon wtp plugin (it does not know all the plugins of pom file and I should sometimes mark them as ignored in lifecycle management xml file of eclipse).
I'm sorry that the question is that long but I hope that I made the case clear and get some help!
Cheers.

I assume that by maven integration in eclipse you specifically mean the m2e plugin. Then what about wtp plugin? And by not using maven and managing the dependencies in eclipse: Do you really mean that I, myself should care about putting my jar files war file in my ear file and going back to the old fashioned library management? (If this is the case then it isn't worth it because working without maven is just wasting time and out of industry standards nowadays.) Or maybe I've not understood this sentence exactly :
but you will need to manage your projects dependencies in Eclipse, not via pom files.

What is the most important part of PC to speed up global code replacement on thousands of pages?

Hi,
I hope you can help and give me an advise.
I have a task to replace part of HTML code on a lot of websites with thousands of pages. On my PC Core Duo the process off relpacing bit of codes is quite slow. I am looking for a new PC and taking this task into account. What part of the PC would speed up this process the most and what configuration would you reccommend. Is the fastest processor most important, more fast memory or Ultra fast HDD. I believe all are important but I have to cut the corners and get the best cost/speed solution for that task. Many thanks for your help in advance.

Coming from a single core 32 bit Windows 7 to a quad core 64 bit with Windows 8, I noticed a marked improvement in pereformance on "batch changes". While the RAM usage is realtively the same (nearly 50% of 2Gb on the old, and only slightly more than 1Gb of 4 on the new) I'd say the processor has a lot to do with it. The old was 2.1gHz, and the new is 2.4, but having three more cores and a 64 bit architecture makes it run much faster.

A code replacing Nametrans redirect?

Hi,
I use following line in obj.conf file
NameTrans fn="redirect" from="/testfolder" url="/test.jsp"
This enables all visitors trying to enter "/testfolder" and all subfolders to redirecting to "/test.jsp" file.
I need is not "redirecting" but "forwarding" of the request entering "/testfolder".
ie. The browser shall be displaying "http://aaa.bbb.ccc/testfolder/test2/" instead of redirected "http://aaa.bbb.ccc/test.jsp"
Is it possible? If possible can I be still reading the original request URL from test.jsp? Or somehow include that info in the process?

Here's some code I wrote years ago (back in the NES 3.6 or 4.1 days, though it still works fine in SJWS 6.1) to allow seamlessly remapping a URI (1:1 mapping of requested URI to handling URI) without issuing a redirect. Usage in obj.conf looks like
NameTrans fn="PW-internal-redirect" apparentPath="/" cgiPath="/apps/home.pl"
Don't worry about "cgi" in the "cgiPath" argument name -- it should work for remapping to any sort of URI. You'll need to replace strcmp() with something like shexp_cmp() in order to have a N:1 "/testfolder/*" to "/test.jsp" mapping as you discuss.
Note that by default the web server log records the first request line (method + URI + protocol/version) in the access log, and this NSAPI does not change that value. So if you remapped /testfolder/ to /test.jsp and fielded a request for /testfolder/, your access log would show something like "GET /testfolder/ HTTP/1.1" even though /test.jsp serviced the request.
To pass the original URI to /test.jsp, you'd need to add something like this to the SAF C code
param_free(pblock_remove("X-INITIAL-URI", rq->headers));
pblock_nvinsert("X-INITIAL-URI", pblock_findval("uri", rq->reqpb), rq->headers);
before resetting ppath and then you could use something like request.getHeader("x-initial-uri") in the JSP to retrieve the original URI.
See the NSAPI programmer's guide for more info if you haven't built a custom SAF before.
/* Netscape NSAPI header files */
#include "nsapi.h"
NSAPI_PUBLIC int PW_internal_redirect(pblock pb, Session sn, Request *rq) {
char *cgiPath;
char *apparentPath;
/* check parameters and ppath value (you could obviously change
from strcmp() to a regexp compile/comparison if needed) */
if ( ((cgiPath=pblock_findval("cgiPath",pb)) == NULL)
|| ((apparentPath=pblock_findval("apparentPath",pb)) == NULL)
|| (strcmp(apparentPath, pblock_findval("ppath", rq->vars)) != 0) )
return REQ_NOACTION;
/* looks like a match, clear the current ppath */
if ( param_free(pblock_remove("ppath", rq->vars)) ) {
/* make the httpd act as if they requested something else */
pblock_nvinsert("ppath", cgiPath, rq->vars);
/* and we return from the function */
return REQ_NOACTION;
The Makefile (Solaris, Sun Workshop compiler) looks like this:
# Defines for example NSAPI programs running under SOLARIS
CC_CMD=cc -DNET_SSL -DSOLARIS -D_REENTRANT -xchip=ultra2
LD_SHAREDCMD=ld -G -s
all:
prepare:
INCLUDEDIR=/path/to/sjwsdir/plugins/include
OBJS = PW_internal_redirect.o
INCLUDE_FLAGS=-I$(INCLUDEDIR) -I$(INCLUDEDIR)/base -I$(INCLUDEDIR)/frame
COMMON_DEFS=-DMCC_HTTPD -DXP_UNIX -DSPAPI20
all: PW_internal_redirect.so
PW_internal_redirect.so: $(OBJS)
$(LD_SHAREDCMD) $(OBJS) -o PW_internal_redirect.so $(EXTRA_LDDEFINES)
.c.o:
$(CC_CMD) $(COMMON_DEFS) $(INCLUDE_FLAGS) -c $<
clean:
rm $(OBJS) PW_internal_redirect.so $(EXTRA_CLEAN)

Hot code replacement

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