J2EE Packaging and manifest Class-Path:

Does anyone know if Weblogic 6.0 supports the redefined deployment extension mechanism
that makes use of the 'Class-Path:' entry in the manifest files?
In our project we have one single .ear file containing a couple of EJB's (.jar
files) and a Web Application (.war file).
We are using log4j as logging mechanism and we would like to keep everything in
the .ear file so that we can make hot-deploys. So we are trying not to make use
of the classpath in startWebLogic.sh. All of our EJB's and the Web Application
makes use of log4j.jar. My question is; can I do the following and make it work
in Weblogic 6.0?
1. In every EJB .jar file I add the follwing to the manifest file - "Class-Path:
log4j.jar"
2. I place the log4j.jar in the root directory of the .ear file.
By doing this I expect that the ear classloader loads the log4j.jar classes. Am
I right or do I do something wrong. At least it does not seem to work.
Using Weblogic 6.0 without service pack.
Thanks,
Steen

This does not work in WebLogic 6.0. It's supposed to be supported in 6.1
Daniel
-----Original Message-----
From: Steen Laursen [mailto:[email protected]]
Posted At: Wednesday, August 08, 2001 1:32 PM
Posted To: environment
Conversation: J2EE Packaging and manifest Class-Path:
Subject: J2EE Packaging and manifest Class-Path:
Does anyone know if Weblogic 6.0 supports the redefined
deployment extension mechanism
that makes use of the 'Class-Path:' entry in the manifest files?
In our project we have one single .ear file containing a
couple of EJB's (.jar
files) and a Web Application (.war file).
We are using log4j as logging mechanism and we would like to
keep everything in
the .ear file so that we can make hot-deploys. So we are
trying not to make use
of the classpath in startWebLogic.sh. All of our EJB's and
the Web Application
makes use of log4j.jar. My question is; can I do the
following and make it work
in Weblogic 6.0?
1. In every EJB .jar file I add the follwing to the manifest
file - "Class-Path:
log4j.jar"
2. I place the log4j.jar in the root directory of the .ear file.
By doing this I expect that the ear classloader loads the
log4j.jar classes. Am
I right or do I do something wrong. At least it does not seem
to work.
Using Weblogic 6.0 without service pack.
Thanks,
Steen

Similar Messages

Classloader isolation and jar manifest Class-Path headers

I have a system where I am loading a set of jars, each with its own URL classloader. So, Jar a is loaded by Loader A, jar b is loaded by Loader B, and so on.
Each jar has a Manifest Class-Path entry declaring its dependence on other jars. So in the example above, a puts c.jar in its Class-path, and, let's say, b also puts c.jar in its Class-path, unbeknownst to a.
Let's say there's a class Foo in c.jar. I want--need--it to be the case that (loader of a.jar == Foo.class.getClassLoader()) from the perspective of classes found in a.jar, and (loader of b.jar == Foo.class.getClassLoader()) from the perspective of classes found in b.jar.
That is, I want a and b to have their own isolated "copies" of c.jar.
Instead, what I'm finding is that Foo.class is loaded once, and his loader "leaks" over to the other jar's loader, if that makes any sense.
Is there any way to accomplish what I am talking about here?
Laird

As I understand the question - no.Hi; I think you misunderstand the question.
The classes are being loaded by the system loader.
Thus there is no way to seperate them.
If you want them seperate then you must use an
explicit class loader to load them.I am using explicit loaders to load them. Let me try again, because I don't think I was clear.
I have an application that has, let's say, nothing at all in its classpath. That is, it was invoked via "java ApplicationMainClass". No classpath.
Now that application reads, let's say, a properties file containing a list of URLs that point to jars.
Now the application creates a new URLClassLoader for each such URL. So if the mythical properties file has ten lines, then I create ten classloaders, each of which points to one and only one URL.
My problem is, even classes loaded by these isolated, separate classloaders are "leaking" across to other loaders. Remember, the parent classloader of all of these classloaders can't see the jars. Its classpath was empty, remember?
The issue is that the findLoadedClass() method of java.lang.ClassLoader scans the whole VM to see if a given Class was loaded before, and if it was, then by default that Class is simply returned. But I don't want that behavior.
Now, I also don't want the behavior of having to load the silly things off disk each and every time. So how do I retain this true multiple classloader isolation?
Thanks,
Laird

Help: manifest class path attribute - OC4J 9.0.3

I have tried everything I can think of. I have even downloaded the developers version of JRun to ensure my code does deploy under the J2EE spec.
Per compleating deployment under JRun, I have migrated back to OC4J and made the approperate modifications to orion-web.xml to include the following entry:
<web-app-class-laoder include-manifest-class-path="true" />
Even with this entry I get the same class not found statements. I am out of ideas.
Anyone got some sugestions?
Info: Ear deployment, static pages deploy under all wars...
Thanks.
Andrew
[email protected]

I have tried everything I can think of. I have even downloaded the developers version of JRun to ensure my code does deploy under the J2EE spec.
Per compleating deployment under JRun, I have migrated back to OC4J and made the approperate modifications to orion-web.xml to include the following entry:
<web-app-class-laoder include-manifest-class-path="true" />
Even with this entry I get the same class not found statements. I am out of ideas.
Anyone got some sugestions?
Info: Ear deployment, static pages deploy under all wars...
Thanks.
Andrew
[email protected]
Hi Andy -
Can you check the attribute and make sure it's the following:
<web web-app-class-loader include-war-manifest-class-path="true"/>
^^^
You have have just typed it in quickly, but I noticed there's a typo in the entry you have above and you are missing the WAR piece of the attribute name.
There's a how-to document on OTN which has an example of this.
http://otn.oracle.com/tech/java/oc4j/htdocs/how-to-servlet-warmanifest.html
cheers
-steve- Hi Steve
Where can I find the zip file I went through the link but doesn't have any link to zip file
Thanks
Ritesh

Manifest class-path does not works

Hi,
We use Jrockit 1.4.2 (latest) on Solaris.
We found that manifest class-path does not seems to work, we got classdef not found messages.
If we change the JVM to sun 1.4.2 that everything works perfectly.
Manifest:
Manifest-Version: 1.0
Ant-Version: Apache Ant 1.5.2
Created-By: 1.4.1_02-b06 (Sun Microsystems Inc.)
Implementation-Title: com.clarify.igb.common.ejbserver
Implementation-Version: 12.5.000
Implementation-Vendor: Amdocs Inc.
Specification-Title: ClarifyCRM Business Object Infrastructure
Specification-Version: 12.5.000
Specification-Vendor: Amdocs Inc.
Class-Path: ClfyShared.jar ClfyCbo.jar ClfyClient.jar ClfyWebInf.jar C
lfyiSupport.jar ClfyUtil.jar jdom.jar ClfyCommon.jar ClfySales.jar Cl
fymOrder.jar ClfyiAdmin.jar ClfyBilling.jar ClfyBillingManager.jar Cl
fyEmailProcessor.jar
What can be the problem?
Regards.,
LJ

Hi Jaejun,
a.jar should also have a MANIFEST.MF Class-Path refering to b.jar.
HTH
Regards,
Slava Imeshev
"Jaejun Lee" <[email protected]> wrote in message
news:3e541ede$[email protected]..
>
I meant <CRLF> not <CR> only.
Thank you.
"Jaejun Lee" <[email protected]> wrote:
Ravinder Pal <[email protected]> wrote:
I have read all message posted in this regard but my problem still
remain.
Please read the context to give me some pointers.
myapp.ear contains
- myejb.jar contains
- manifest with Class-Path a.jar b.jar
- a.jar (Internal)
- b.jar (Some external Vendor)
Problem: Call from a.jar classes which reference b.jar classes doesraise
a ClassNotFoundException.
Thanks.
I have a similar problem with WebLogic 7.0 sp1.
I have to verify this.
Dose WebLogic support MANIFEST.MF Class-Path in development-mode.
Indeed, I just put a.jar and b.jar in application directory.
I put Class-Path: b.jar<carrage-return> in MANIFEST.MF of a.jar.
But, a.jar cannot find classes in b.jar.
Do I have to make EAR?

Verify a jar's manifest class-path

I want to verify a jar file's manifest class-path. By that I mean I want to verify that every import of every class in the jar file is reachable on the classpath specified in the jar file's manifest. I tried using a ClassLoader to load every class in the jar file and that does indeed catch a few errors (imported classes that are not on the classpath), but it does not catch them all -- I have situations where loading the class works fine, but when the code is executed, I get NoClassDefFoundError because an imported class is missing from the classpath. I have tried things like calling getDeclaredMethod() on the loaded class to sortof force all the imports to be resolved, but that apparently does not work.
So, can someone tell me how to sortof "force" a loaded class to reference/validate all its imports?
Thanks,
Lee

Well yes, I know that executing the code would do it. But I'm not in a position to execute the code -- I'm doing this during a build and want to verify that I've built all the jars properly and have all the right classpaths. It's actually quite easy to use ANT to compile and create jar files that produce NoClassDefFoundError at runtime, due to leaving needed classes from the jar, or from bogus classpaths in the jar's manifest.
So, I was hoping there was some other way to do this. Perhaps I need to do something ugly like examining the bytecodes of each method...
Thanks,
Lee

ATG-Client-Class-Path and ATG-Class-Path

What is the difference between ATG-Client-Class-Path and ATG-Class-Path (defined in MANIFEST.MF)? Is it mandatory that these two should have same values all the time? If the values are different, where the application will behave differently?
Thanks,
Gopinath Ramasamy

ATG-Class-Path specifies resources that a module requires and same are assembled in the EAR's lib folder when EAR is created using runAssembler. While ATG-Client-Class-Path mention those resources which are required for client side functionality (like ACC) of that module. If you don't specify this it would not affect your application anyways as EAR will be assembled from ATG-Class-Path. Please refer this for details and all the supported manifest attributes:
http://docs.oracle.com/cd/E35318_01/Platform.10-1-1/ATGPlatformProgGuide/html/s0403applicationmodulemanifestfile01.html

Jar's manifest Class-Path option

Hey, hopefully this is my last question for a while.
I downloaded a custom look and feel that's packaged in a jar file.
Here's the directory structure.
Main-Program\*.class
Main-Program\MyProgram.jar (the created jar)
Main-Program\Data\kunststoff.jar (downloaded look&feel jar)
I can compile the class files like this:
javac -classpath .;Data\kunststoff.jar MainClass.java
and run it like this:
java.exe -classpath .;Data\kunststoff.jar MainClass
This works fine. But I want my program to be an executable jar.
So I create the exec. jar like usual
jar cf0 MyProgram.jar *.class
jar umf mainclass.txt MyProgram.jar
When I package the jar using the manifest file I include the Class-Path var:
Manifest-Version: 1.0
Main-Class: Database
Class-Path: .;Data\kunststoff
Now when I try to execute the jar it gives me the error:
"Could not find the main class. Program will exit!"
Any ideas? thanks.

Manifest-Version: 1.0
Main-Class: Database
Class-Path: .;Data\kunststoff>
Better change that to "Class-Path: Data/kunststoff.jar"
(http://java.sun.com/docs/books/tutorial/jar/basics/manifest.html)
And remember to have a line break after it..
Now when I try to execute the jar it gives me the
error:
"Could not find the main class. Program will exit!">
But the main class should still be found even if the class-path entry was not totally correct, does Database.class show in jar tf MyProgram.jar?

Javac / Manifest Class-Path

Hi guys,
I have problems with javac not finding classes when I use the extension mechanism.
I have several jars: abc.jar def.jar ghi.jar ...
To simplify the classpath when trying to compile another project with these jars, I use the extension mechanism and create a new jar (alphabet.jar) containing only a manifest file:
Manifest-Version:1.0
Class-Path: abc.jar def.jar ghi.jar ...The following works fine (assuming for example that abc.jar contains org/alphabet/Abc.class):
> java -classpath alphabet.jar org.alphabet.AbcBut this fails:
> javac -classpath alphabet.jar Test.java
Test.java:1: package org.alphabet does not exist
import org.alphabet.Abc;
1 errorTest.java:
import org.alphabet.Abc;
public class Test {}I've searched on google and co. for more information but could not get anything. Sun's documentation http://java.sun.com/j2se/1.4/docs/tooldocs/findingclasses.html doesn't mention anything about javac not using the extension mechanism.
This seems to happen on all JDKs (1.2.2, 1.3.1, 1.4 at least).
Thanks in advance for your help!

hi again,
the next what you should know is that a package has to really exist as directories on your harddisk by compile- and runtime and the name of the class-file needs to be the same name as the class-name in it.
example:
c:\javalib\org\alphabet\Abc.java
c:\javalib\Test.java
compile both with 1 javac-command
c:\>cd c:\javalib
c:\javalib\>javac Test.java
all imported libs (c:\javalib\org\alphabet\Abc.java) will be automatically compiled with this command. you will have now 2 class-files:
c:\javalib\org\alphabet\Abc.class
c:\javalib\Test.class
now you make a 'manifest'-file for creating a autostartable jar-file:
create a textfile 'mymanifest.txt' (name is not important) in the root of your projekt with the following content:
c:\javalib\>mymanifest.txt
Manifest-Version: 1.0
Main-Class: Test
Created-By: Your Name
(if the start-class is in a package you have to write:
Main-Class: mypackage.Test)
now you can make a executable jar (a jar with a manifest) with the command:
c:\javalib>jar cvfm alphabet.jar mymanifest.txt .
(dont forget the last point!)
now you can run the jar simply with:
(it's now a java-executable)
c:\javalib>java -jar alphabet.jar
hope to help
cu
oliver scorp
ps: a jar-file is nothing other than a zip-file, rename it and try it out. you will see that the pathes still exist in the compressed file.
pps: plz dont forget my dukes!

Who knows about Jar/Manifest: Class-Path-Attribute

My question is:
When packaging my classes and ressource files into a jar file, everything works fine as long as I put the manifest-file into the parent directory of the package folders (there's the main class too) and set its Class-Path-Attribut just as . (a dot).
I'm working with WinXP Prof.
As soon as I fill in a path with backslashes or slashes as separator, the produced jar-file doesn't work (class loader does'nt find main-class).
Is the problem the drive-letter (D:) in the path or do you know something else?
Greetings
Frank

Yes, and likely the . is what you need ...saying: I want the packages which begin in the same directory as the jar running this application. Even if your class is in a package hierarchy like tst.test.Support.class, if the directory tst is in the same directory as the application jar, you would use classpath . not tst/test/Support.class. If you put the tst package in a directory under the folder where the jar resides, say called testit ...you would then have a classpath in the mainifest like testit/. The class path always needs to get you to the root of any package you want to use ...but not into the package itself. Java recognizes when it is looking at a package nesting due to the package declaration syntax in the files, the classpath just points to the location of the root of that package and nothing more. Does this make sense?

How do I add the system classpath to Jar Manifest Class-Path

My application is implemented on win2000 and need to be moved to unix as a executable jar file, the oracle jdbc classes (classes12.zip and classes111.zip) were included in MANIFEST.MF as the following:
Class-Path: /Oracle/Ora81/jdbc/lib/classes12.zip /Oracle/Ora81/jdbc/lib/classese111.zip
When I move the jar file to unix, the classpath will be changed, is there a way to make the jar file read the class-path from system CLASSPATH?
Thank you.
Y.

I have the same problem for weeks now, and I can't seem to get it solved. If you found anything please inform me.
thanks in advance
Eran

Stand alone class and the class path

Hi,
I have a simple Java project in Eclipse environment. The project has it's class path,
that contains a jar file that I need to use.
The project runs perfect in the Eclipse.
Now, I need to take the main class out of my project, to function alone in another environment.
My problem is that out of the environment, I don't know how the class should know that classpath.
I moved that jar to the same folder that the class located in, but I don't know how to tell it that the jar is there.
My goal is to run my standalone class from another java class.
I'm afraid that examples in command environment wouldn't help me.
Thanks a lot for any help !

moshi wrote:
I have a simple Java project in Eclipse environment. The project has it's class path,
that contains a jar file that I need to use.Ok, so you have a class that you have written that depends on an external library. Fair enough.
The project runs perfect in the Eclipse.
Now, I need to take the main class out of my project, to function alone in another environment.Maybe (just maybe!) defining what exactly that "other environment" is could help us help you.
My problem is that out of the environment, I don't know how the class should know that classpath.Well, obviously that depends on what that other environment is.
You must have some way to influence that other environments classpath, or you couldn't even get it to call/use your class.
I moved that jar to the same folder that the class located in, but I don't know how to tell it that the jar is there.Now you're just guessing.
My goal is to run my standalone class from another java class. That's simple enough, you probably do it all the time.
I'm afraid that examples in command environment wouldn't help me.And why exactly is that?
Do you realize that you tell us far too little about your problem for us to be able to actually help you?

WAR meta-inf/manifest Class-Path jars use which classloader ?

If using an expanded EAR structure, my Web App requires some utility classes. I
can either put these in my :-
meta-inf/manifest.mf
Class-Path : utility.jar
OR
web-inf/lib
can contain the utility.jar
Is there any difference in terms of which classloader is used to load these classes,
the EAR/EJB classloader or the Web App child classloader ?
What is recommended ?

If have found out the answer myself by testing it :-
A jar in the meta-inf/manifest.mf e.g. Class-Path : utility.jar
will be loaded by the EAR/EJB level classloader
whereas
web-inf/lib containing utility.jar
will be loaded by the Web App level child classloader.
Dimitri Rakitine <[email protected]> wrote:
I have this question too - it appears that 6.1sp2 attempts to use Class-Path
in jars in WEB-INF/lib - what this Class-Path: is supposed to do ???
Pete <[email protected]> wrote:
If using an expanded EAR structure, my Web App requires some utilityclasses. I
can either put these in my :-
meta-inf/manifest.mf
Class-Path : utility.jar
OR
web-inf/lib
can contain the utility.jar
Is there any difference in terms of which classloader is used to loadthese classes,
the EAR/EJB classloader or the Web App child classloader ?
What is recommended ?--
Dimitri

Packages and date class

hi,
i'm new to java so this question can be stupid. i try to write a package which i'll use later in a jsp page. here is the code:
package anc_pck;
public class str_ops
     public String format_date(String day,String mounth,String year)
          String mysql_date = year + "-" + mounth + "-" + day;
          return (mysql_date);
     public int control_date()
          java.util.Date curDate = new java.util.Date();
          int temp;
          temp = curDate.getDate();
          return (temp);
When i try to compile it javac gives error such like:
c:\jakarta-tomcat-4.0.5\classes\anc_pck\str_ops.java:18: warning: getDate() in java.util.Date has been deprecated
temp = curDate.getDate();
^
What is the problem?

Here is the new code:
package anc_pck;
public class str_ops
     public String format_date(String day,String mounth,String year)
          String mysql_date = year + "-" + mounth + "-" + day;
          return (mysql_date);
     public String control_date()
          Date curDate = new Date();
          DateFormat df = DateFormat.getDateInstance();
          String s = df.format(curDate);
          return (s);
and new errors of course:
c:\jakarta-tomcat-4.0.5\classes\anc_pck\str_ops.java:15: cannot resolve symbol
symbol : class Date
location: class anc_pck.str_ops
Date curDate = new Date();
^
c:\jakarta-tomcat-4.0.5\classes\anc_pck\str_ops.java:15: cannot resolve symbol
symbol : class Date
location: class anc_pck.str_ops
Date curDate = new Date();
^
c:\jakarta-tomcat-4.0.5\classes\anc_pck\str_ops.java:20: cannot resolve symbol
symbol : class DateFormat
location: class anc_pck.str_ops
DateFormat df = DateFormat.getDateInstance();
^
c:\jakarta-tomcat-4.0.5\classes\anc_pck\str_ops.java:20: cannot resolve symbol
symbol : variable DateFormat
location: class anc_pck.str_ops
DateFormat df = DateFormat.getDateInstance();
^

Diff between CLASSPATH and weblogic.class.path in t3config

Hi,
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          WEBLOGIC_HOME="d:\Weblogic"
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          java.compiler=symcjit
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          weblogic.class.path=d:\Weblogic\license;d:\Weblogic\classes;d:\Weblogic\lib\weblogicaux.jar
          INITIAL_HEAP= 32 MB
          MAX_HEAP= 32 MB
          SERVERCLASSPATH=
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Pankaj,
          It all depends on whether you want to do reload on modify feature or not. If you don't need reload on modify they you can have servlets in weblogic.class.path.
          Two things to remember if you can't invoke servlets.
          1. Do you have the servlet registered.
          2. If not, do you have ServletServlet property uncommented. If this property is not commented out then you have to give the complete path to make servlets work.
          Good luck,
          Prasad
          Pankaj Tandon wrote:
          > Hi,
          > My servlets which would run happily in WLS4.0.2 on NT do not run anymore
          > in WLS4.5.
          > In order to help me troubleshoot this problem will someone please
          > explain me the difference between the path mentioned against
          > weblogic.class.path in the output of t3config
          > and the path mentioned against CLASSPATH in the same output.
          >
          > When I type t3config I get the following. What is the diff between the
          > lines marked ---->>>>
          > WebLogic startup settings are presently:
          >
          > CLASSPATH Prefix=
          > .;C:\wip\java\ejb\classes;d:\weblogic\jre1_1\lib\classes.zip;d:\weblogic\jre1_1\lib\rt.jar;d:\weblogic\classes\boot;d:\Weblogic\evel\cloudscape\lib\cloudscape.jar
          >
          > ------->>>>>CLASSPATH=
          > ".;C:\wip\java\ejb\classes;d:\weblogic\jre1_1\lib\classes.zip;d:\weblogic\jre1_1\lib\rt.jar;d:\weblogic\classes\boot;d:\Weblogic\evel\cloudscape\lib\cloudscape.jar;d:\Weblogic\jre1_1\lib\classes.zip;d:\Weblogic\jre1_1\lib\rt.jar;d:\Weblogic\license;d:\Weblogic\classes;d:\Weblogic\lib\weblogicaux.jar;d:\Weblogic\eval\cloudscape\lib\cloudscape.jar"
          >
          > JAVA_HOME= "d:\Weblogic\jre1_1"
          > WEBLOGIC_HOME="d:\Weblogic"
          > system properties:
          > weblogic.system.home=d:\Weblogic
          > java.compiler=symcjit
          >
          > ------->>>
          > weblogic.class.path=d:\Weblogic\license;d:\Weblogic\classes;d:\Weblogic\lib\weblogicaux.jar
          >
          > INITIAL_HEAP= 32 MB
          > MAX_HEAP= 32 MB
          > SERVERCLASSPATH=
          > ".;C:\wip\java\ejb\classes;d:\weblogic\jre1_1\lib\classes.zip;d:\weblogic\jre1_1\lib\rt.jar;d:\weblogic\classes\boot;d:\Weblogic\evel\cloudscape\lib\cloudscape.jar;d:\Weblogic\jre1_1\lib\classes.zip;d:\Weblogic\jre1_1\lib\rt.jar;d:\Weblogic\classes\boot;d:\Weblogic\eval\cloudscape\lib\cloudscape.jar"

Problem in package and accessing classes in the same directory

i have a class JApplet1 which calls other classes from the same directory.ALL the other classes have a main within them whereas JApplet1 has an init method within it...the problem is this JApplet1 class is not able to call the other classes. there r no compile time errors but at runtime the classes are not being called...what should i do....suggestions plz..

What exception are you getting?

J2EE Packaging and manifest Class-Path:

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