Dynamically reloading recompiled class files

How can I configure standalone OC4J to automatically reload class files compiled to WEB-INF/classes without restarting the server? I have tried different settings in orion-web.xml (development="true", added classpath, search-local-classes-first="true") but nothing seems to work.

I think this bug (3473628) has to do with something different than what I am referring to. It deals with JSP files located under WEB-INF not compiling (which is a non-standard location for JSP files anyway).
The behavior I am looking for is: if I change a Java source class (e.g., a bean class) and recompile it to WEB-INF/classes, I want the server (OC4J) to notice that a new .class file for my bean now exists, unload the existing class file, and load the new one into the VM, without restarting.

Similar Messages

Recompile .Class files

I am very new to Java, and can only do very basic things.
A friend of mine sent me an example program that would automate a task in an online game. He told me to extract from the .jar, and decompile the f.class file. Then to use the crtl+f find function to find beltran 22 and replace it with beltran22. I have been able to do all that.
However, when I try to recompile into a .jar, I get a corrupted file error, I am completely lost with this. I had trouble understanding the Java tutorials.
The link to the file download I am trying to change (small file) is here. http://upload2.net/page/download/N4d2SERco9Wtxkj/For+Jake.jar.html
Thank you so much for helping me. If you could download the file, then change as I was supposed to so it is a .jar file again, then explain what you did that would be wonderful!

Beltran wrote:
A friend of mine sent me an example program that would automate a task in an online game.u bad man cheater

JWS is not automatically reload the class files

Hi,
My problem is whenever i deploy new code in the server, My client JVM is not taking the updated code. It uses the old classes from the JVM cache. How to solve this poblem? can anyone help me :)

>
My problem is whenever i deploy new code in the server, My client JVM is not taking the updated code. It uses the old classes from the JVM cache. How to solve this poblem? >Time stamps on servers can delay download. The new code will not run until the time after it is downloaded (and the program is restarted). Otherwise I have found automatic update to be quite reliable.
Have you checked that your JNLP file is valid? What is the URL of the launch file?

Reloading support classes in a web-app?

          Hi,
          I had previously been successful in compiling classes
          to a directory which was specified in the weblogic.properties
          file as the weblogic.httpd.servlet.classpath. If a class
          were recompiled, the updated .class file would be reloaded.
          However, now we're adhering to the java web application hierarchy,
          where weblogic.httpd.servlet.classpath doesn't apply. Is
          there a way of specifying a directory which should reload
          updated ,class files?
          Thanks,
          j.joseph


You should not put application scope objects in your session regardless of
          its size (which session would you put it in anyways?). Put it in your
          application scope servlet context, which is available to all JSPs and
          servlets. You can do more fancy things but this should be okay.
          Tinou Bao
          www.tinou.com
          "Zaska" <[email protected]> wrote in message news:3b169cff$[email protected]..
          >
          > Hi,
          >
          > I have a situation where I must read data from the database when a web
          application
          > starts. I should store that data somewhere (not to session object, because
          it
          > might grow to large). What could be a good place to save a big object
          containing
          > data which is afterwards retrieved from allmost all JSP/Servlets in the
          same application?
          > I can use database only once, when the application is loaded.
          > Br -z
          >

Disabling dynamic reloading

Hi, i'm using iWS 6.0 SP2 on solaris 8 and i don't know how to disable dynamic reloading of classes. I have tried to set the reload-interval parameter to a negative number, to set the class-loader classpath parameter to "", but it still reloads the classes.
The only thing i can think of is setting the reload-interval to a huge number, but there must be another way.
Juan

It's always Microsoft who gets blaimed ;-)
          First, I am almost certain that any OS will not let you copy a file if there
          is an opened file descriptor of the file owned by some other process.
          Second, luckily the class loader code that handles this is pure Java, so it
          takes advantage of garbage collection here: if there is a live reference to
          an object, it's not going to be freed under you.
          Hope this helps.
          -ruslan
          Andy Nuss wrote:
          > Hi,
          >
          > Question concerning dynamic reloading, as regards the property:
          > weblogic.httpd.servlet.reloadCheckSecs=xxx
          >
          > While the NT OS is copying the file, rewriting the class file which was
          > previously there, is the dynamic class loader smart enough to figure out
          > that the bytecodes where in the middle of being copied, hence in an
          > inconsistent state, or does it crash?
          >
          > Thanks,
          > Andy

Problems trying to "hot-deploy" class files in iPlanet. Want to deploy a compiled class (i.e. servlet, jsp) without having to bounce the server. Known issue in iPlanet? How can I get around?

Currently iPlanet is not allowing us to hot deploy a modified class file(i.e., servlet) as it advertises. It doesn't seem to have a problem with jsp's however. But everytime we modify a servlet(say in an emergency), and wish to deploy, we still have to bounce the KJS. We would like to avoid this if possible. How? I heard this might be a known issue in iPlanet.

I apologize but this is a clarification of this problem. We are having a problem dynamically reloading java classes that are referenced by jsp's and servlets. The problem DOES NOT exist when trying to reload jsps or servlets themselves. We would like to reload these classes without having to restart the processes. Any thoughts would be helpful. Thanks.

Flash player caches external class files

Hi I work for a technology company in San Antonio and we use
flash for developing interactive course ware. We use a flash shell
which loads the separate pages of our lessons and have noticed a
very big problem with the way the flash player caches class files.
Basically it seems that when you use the 'import' call in
actionscript the flash movie doesn't import the external class if
it has already been loaded. the problem is that we have a huge
amount of developed classes, many of which have been updated
throughout our development. Is there any way for force clear the
ASO cache in actionscript or force import external actionscript
classes?

Yes we know and use the delete aso files feature all the
time. this however is a runtime problem. meaning that the flash
player itself is caching class files and there is no way to get it
to refresh these links without doing a forced refresh of the shell
itself. this is something that is not an option as it doesn't allow
for fluid page loading. Is there any way to force reload/import
class files that have already been loaded, that is clear the
class/aso cache in the flash player itself using actionscript
code?

Dynamic reloading - jars

Hi,
We have some jars (not listed in the modules.xml) in our ear, from which we want to be able to dynamically reload some classes during development.
Is there a way to expand these jars during deployment, so that we can use the regular dynamic reloading mechanisms?
We use sun app server platform edition 8.1.
Thanks,
Ronny.

But in the original question, there are some external jars which are not part of the ear and therefore not exploded as part of the deployment.
I assume these jars are module jars (ejb, war etc) instead of the library jars? For library jars, you probably can just copy the jars to the exploded location and then reload.
For module jars, our current .reload function won't try to explode those jars and redeploy them...

How to reload class file for java objects in CF MX7

I'm trying to create a simple java object for use in a CFML
page. According to the topic "About ColdFusion and Java objects" in
the CF developer's guide, I can compile my java module and put the
.class file in the CFusionMX7/wwwroot/WEB-INF/classes directory and
it'll be dynamically reloaded any time CF sees a new .class file
there. But the dynamic reload isn't happening; I have to restart
the CF server to get it to pick up a new version.
I don't believe this directory is in the "general JVM
classpath"; I don't find "classes" in the Java Class Path in the CF
Administrator's System Information page. And I have all the caching
options turned off on the "Server Settings > Caching" page, if
that has any bearing on it.
Are there any known issues around this dynamic reload
capability, or maybe a more definitive way to make sure the
WEB-INF/classes directory isn't in the classpath?
Thanks,
James

Yes, I understand. But if I'm reading it correctly, what
you're saying seems to contradict the documentation
http://livedocs.adobe.com/coldfusion/7/htmldocs/00001561.htm
ColdFusion dynamically loads classes that are either .class
files in the web_root/WEB-INF/classes directory or in JAR files in
the web_root/WEB-INF/lib directory. ColdFusion checks the time
stamp on the file when it creates an object that is defined in
either directory, even when the class is already in memory. If the
file that contains the class is newer than the class in memory,
ColdFusion loads the class from that directory.
http://kb.adobe.com/selfservice/viewContent.do?externalId=tn_18228&sliceId=1
Dynamic class reloading for Java servlets classes and
forcfobject (sic) Java classes is disabled by default in
ColdFusion MX. To enable dynamic class reloading, do the following:
Also, I seem to recall that setting worked in a prior
version. Though I would have to test it again on another machine to
be certain.

How to load a .class file dynamically?

Hello World ;)
Does anyone know, how I can create an object of a class, that was compiled during the runtime?
The facts:
- The user puts a grammar in. Saved to file. ANTLR generates Scanner and Parser (Java Code .java)
- I compile these file, so XYScanner.class and XYParser.class are available.
- Now I want to create an object of XYScanner (the classnames are not fixed, but I know the filename). I tried to call the constructor of XYScanner (using reflection) but nothing works and now I am really despaired!
Isn't there any way to instantiate the class in a way like
Class c = Class.forName("/home/mark/XYScanner");
c scan = new c("input.txt");
The normal call would be:
XYLexer lex = new XYLexer(new ANTLRFileStream("input.txt"));The problem using reflection is now that the parameter is a ANTLRFileStream, not only an Integer, as in this example shown:
Class cls = Class.forName("method2");
Class partypes[] = new Class[2];
partypes[0] = Integer.TYPE;
partypes[1] = Integer.TYPE;
Method meth = cls.getMethod("add", partypes);
method2 methobj = new method2();
Object arglist[] = new Object[2];
arglist[0] = new Integer(37);
arglist[1] = new Integer(47);
Object retobj = meth.invoke(methobj, arglist);
Integer retval = (Integer)retobj;
System.out.println(retval.intValue());Has anyone an idea? Thanks for each comment in advance!!!

Dump all of your class files into a directory.
Use the File class to list all files and iterateover
the files.NastyNot really, when you are dynamically creating code, I would expect the output to be centralized, not spread out all over the place.
>
Use a URLClassloader to load the URL that isobtained
for each file with file.toURI().toURL()(file.toURL()
is depricated in 1.6)Wrong, the URL you give it must be that of the
directory, not the class file.No, I did this quite recently, you can give it a specific class file to load.
>
Load all of the classes in this directory, thatway
any anonymous classes are loaded as well.Anonymous classes automatically loaded when the real
one isIt can't load it if it doesn't know where the code is. Since you haven't used a URL classloader to load once class file at a time, you would never encounter this. But if you loaded a class file that had an anonymous classfile it needed, would it know where to look for it?
>
From this point you should be able to just get a
class with Class.forName(name)No. Class.forName uses the classloader of the class
it's called in, which will be the system classloader.
It won't find classes loaded by a URLClassLoader.got me there.

IAS Dynamic Reloading doesn't reload related classes!

Hi,
I am trying to configure dynamic reloading on the development machine [on
Solaris 5.8] in order to get servlets and classes invoked by those servlets
updated dynamically without having to restart the process. What I'd done was
setting the SYSTEM_JAVA/Versioning/Disable value to 0, according to the
Appendix B in Programmer's Guide.
Dynamic reloading works fine for individual servlets but not the classes
that the servlets invoke. I'd tried putting those classes name as
GX_VERSIONABLE value, but it still didn't work.
Are there any ways that I can get those classes dynamically reloaded along
with the servlets? This will greatly save time for our application
development.
Any help would be really appreciate.
Phatrakom S.

Not that it will be of great help, but I am also unable to dynamically reload a standard class, only those that are of type servlet.

How do I dynamically load a SWF that was compiled from an Fla with a linked external class file

I am dynamically loading external SWFs in a Main Fla in response to clicks on a menu.
The loading code is standard and works fine for all of the SWFs except one. When I try to load it I get the following error:
Error #2044: Unhandled IOErrorEvent:. text=Error #2035: URL Not Found.
I am certain that the URL to the problem SWF is correct. The SWF itself doesn't load any other SWFs or images.
The problem SWF is linked to an external class file and compiled with it.
i.e. in the properties panel of the main timeline of the problem SWF's Fla I have entered the path to the external class.
1. there is no problem compiling this SWF with the class (it works fine by itself)
2. if I remove the external class from the properties panel and don't use it the resulting SWF imports without a problem into the Main Fla mentioned before
So the problem seems to be the fact that the external class is linked in the properties panel. Is this a path problem?
Would appreciate any suggestions,
Thanks!

despite what you say, that loaded swf most likely is loading something and that's the cause of the error.
you could test that by putting the main swf's embedding html file in the same directory with problematic swf. if the problem is as explained above, you'll have no problem when the main html is in the same directory with the loaded swf.

Just upgraded to jdk1.4 from 1.2 do I need to recompile all my class files?

Just upgraded to jdk1.4 from 1.2 do I need to recompile all my class files?
They run fine, but is there any benefit of recompiling all my class files?

Nope. AFAIK you would experience exactly zero benefits from just recompiling the code. All that would do is regenerate the bytecode within the .class file(s), and as far as I know, the class file specification did not change. I am not aware of any modifications to the bytecode generation process in the 1.4 release that constitute actual changes in what's generated (for example, generating more efficient or optimized bytecode).
(any other respondents feel free to correct me on this, as I admittedly spend very little of my time down at the bytecode and classfile level)
-dSn

Dynamically reload xml file

hi
What is the technique for dynamically change a xml source file (without changing the structure) for use with jdbc XML driver ?

see https://bugs.eclipse.org/bugs/show_bug.cgi?id=27980
Per Digre wrote:
> I need to dynamically set editor file extensions from a preference page.
> However I do not find any APIs to do this. It seems like it has to be
> loaded from the plugin.xml when the plugin initializes.
>
> One thing I thought of was following..
> 1. Create a add-on plugin just for the file extensions.
> 2. Manipulate the add-on's "plugin.xml" with new file extensions
> 3. Dynamically reload the add-on plugin to make the new extensions take
> effect
> Please stop me if I'm out of my mind!
>
>
> --- Per ---
>

Who to load a large .class file dynamically

i want to load a class dynamically from net work ,
i know the following method.
ClassLoader.define(String name byte []b,int ,int);
But What's happen when the class is larger,
Because the we can create a array of bytes with an integer only,
but what if the .class file is larger than the integer range.
Thanks in advance.

URLClassLoader will load the class for you.
It's impossible to create a class that's larger than Integer.MAX_VALUE bytes long, so this won't be a problem.
Even if it weren't, you'd be insane to try to create such a monster.

Dynamically reloading recompiled class files

Similar Messages

Maybe you are looking for