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!
Similar Messages
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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,
SteenThis 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 -
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?
LairdAs 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 -
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.,
LJHi 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,
LeeWell 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 -
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 -
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? -
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 -
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 -
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
FrankYes, 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?
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Manifest Class-Path: attribute setting
Hi there,
Though the classpath entry is made it is not reacting as expected...Need help
in understanding the classpath attribute behaviour on web Logic Server 7.0...
how do I make a jar file inside a war file(war/WEB-INF/lib)refer another jar file
outside this war.
You looked into the Jar section of the Sun tutorial did you?
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Hi,
I have a session bean, that references some external classes. I am deploying the
application as a ear file. The session beans are stored in a jar file and the
external classes are stored in a separate jar file. Both the jar files go into
an ear file. The manifest of the session bean jar file defines the relative URI
of the other jar file using the Class-path attrtibute. I use JDK 1.3.1. However,
when I try to deploy the ear, WLS complains about not being able to find the extermal
class. I use WLS 6.1. This is driving me nuts, any help would be highly appreciated.
I have attached the EAR file.
Thanks
MeerajI was wondering as to why was this constraint placed on EJB's in
weblogic(that Class-Path can't be used in manifest). After all EJB jar is
also a jar file, and as what java extensions mechanism dictates, any jar
file can utilize this feature.
and how the code would the loadClass/findClass method in the classloader
look like of I were to disable this feature (like what weblogic currently
behaves....)
any thoughts!!!
- Rajeev Dave
"Deepak Vohra" <[email protected]> wrote in message
news:[email protected]...
Manifest Class-Path
Use the manifest file to specify that a JAR file can reference another JARfile.
Standalone EJBs cannot use the Manifest Class-Path. It is only supportedfor
components that are deployed within an EAR file.
To use the manifest file to reference another JAR file:
Specify the name of the referenced JAR file in a Class-Path header in the
referencing JAR file's Manifest file.
The referenced JAR file is named using a URL relative to the URL of the
referencing JAR file.
Name the manifest file META-INF/MANIFEST.MF in the JAR file
The Class-Path entry in the Manifest file is as follows:
Class-Path: AAyy.jar BByy.jar CCyy.jar.
Meeraj wrote:
Hi,
That is not what I want to do. I had got similar stuff working fine with
JBoss
by resolving dependencies using Class-path manifest attribute.
Thanks
Meeraj
Deepak Vohra <[email protected]> wrote:
Add the external classes to the Sessions Bean jar.
Meeraj Kunnumpurath wrote:
Hi,
I have a session bean, that references some external classes. I amdeploying the
application as a ear file. The session beans are stored in a jar fileand the
external classes are stored in a separate jar file. Both the jar
files
go into
an ear file. The manifest of the session bean jar file defines therelative URI
of the other jar file using the Class-path attrtibute. I use JDK
1.3.1.
However,
when I try to deploy the ear, WLS complains about not being able tofind the extermal
class. I use WLS 6.1. This is driving me nuts, any help would be
highly
appreciated.
I have attached the EAR file.
Thanks
Meeraj -
EAR + EJB + Spring Class-Path problem
Hi,
I'd been using JDeveloper for a few years, but this is the firstime I package an EJB application. I have two jars (the ejb.jar and api.jar) both are using the Spring 2.0 Library that JDeveloper provides.... but when I package the EJB as an EAR everything seems to be OK:
-ear
- META-INF
- application.xml
- ejb.ar
- api.jar
- spring.jar
But when I try to publish the EAR in the OC4J standalone management console, this error is thrown:
oracle.classloader.util.AnnotatedNoClassDefFoundError: Class not found: org.springframework.ejb.support.AbstractStatelessSessionBean. Dependent Class sv.com.sti.ebs.sgd.ejb.SgdTrxSessionBean
Cargador: sgd-ear.root:0.0.1
(Failure analysis caught java.lang.NullPointerException)
So I Think the ejb is not using the spring libraries located in the EAR's root or maybe I have to add the classes to the ejb's manifest.....But JDeveloper ejb jar deployment doesn't add any entries in the Manifest Class-Path entry....
Please Help.Hi
Try putting the utility classes in an EJB JAR file, then putting a Class-Path attribute in the MANIFEST.MF for that JAR far. That is
Class-Path: lib/myutils.jar
It doesn't matter where you put the utility JAR, so long as it's somewhere in the EJB JAR and you specify it in Class-Path. This should make the utility classes accessible to servlets as well. Note that classes defined in a WAR file's ./lib directory willl not be accessible to EJBs, as a matter of policy.
Best wishes
Kevin -
Jar: Manifest-Attribute "Class-Path"
I've got a problem with the Class-Path-attribute of the JARs manifest-file. So I've written a real simple application to test where the problems occure... but even this trivial app does not work!
The execution starts at "Starter.java":
public class Starter{
public static void main(String args[]){
packageOne.Caller.callWriter();
}The class "Caller" is in a JAR ("Caller.jar") in the same directory as Starter.java.
Caller.java:
package packageOne;
public class Caller{
public static void callWriter(){
packageTwo.Writer.write("Write this");
}The class "Writer" is in a JAR ("Writer.jar") in the same directory as Starter.java and Caller.jar.
Writer.java:
package packageTwo;
public class Writer{
public static void write(String message){
System.out.println(message);
}The file Caller.jar consists of Caller.class and the Manifest.mf. The package-structur/the path seams to be all right.
The file Writer.jar consists of Writer.class and the Manifest.mf. The package-structur/the path seams to be all right.
If I invoke the Starter with:
java Starter -classpath Caller.jar;Writer.jareverything's fine.
Now, I added the following line to the Manifest.mf of Caller.jar:
Class-Path: Writer.jar(with one empty line between Manifest-Version: 1.0 and the new line.
So... shouldn't it be possible now, to invoke the application with:
java Starter -classpath Caller.jar ???
It doesn't work. So: what have I misunderstood?
(The error message is:
Exception in thread "main" java.lang.NoClassDefFoundError: packageTwo/Writer
at packageOne.Caller.callWriter(packageOne/Caller.java:5)
at Starter.main(Starter.java:3)Hmmm, I tested it and here are the command I ran and their results. Try doing the same on your computer:aleph% mkdir packageOne
aleph% mkdir packageTwoThat created the directories.aleph% cat > Starter.java
public class Starter{
public static void main(String args[]){
packageOne.Caller.callWriter();
aleph% cat > packageOne/Caller.java
package packageOne;
public class Caller{
public static void callWriter(){
packageTwo.Writer.write("Write this");
aleph% cat > packageTwo/Writer.java
package packageTwo;
public class Writer{
public static void write(String message){
System.out.println(message);
}That created the source files: Starter.java in the current directory, Caller.java under packageOne and Writer.java under packageTwo. Next the compiling and creating the manifest file:aleph% javac Starter.java
aleph% cat > MF
Class-Path: Writer.jarThat created additional info to be included in manifest file and put it in a file called MF.
Then I package "caller.jar" with the manifest and "Writer.jar" without it:aleph% jar -cmf MF caller.jar packageOne
aleph% jar -cf Writer.jar packageTwoDelete the package* directories so java wont get confused...aleph% rm -r package*And finally run the thing. Remember that the path separator is : in unix but ; in DOS, if that is what you are using.aleph% java -cp .:caller.jar Starter
Write thisNo problems anywhere. What are the steps you did? -
Java: build 1.5.0_05-b05
Ant: 1.6.2
I use Ant <jar> task to create a standalone application in a .jar file. I have a very long "Class-Path" in the Manifest.MF file. The long Class-Path is wrapped at every 70th character by the <jar> task. I cannot run "java -jar <the jar file>", because Java runtime cannot find classes.
I found the following Q&A from ANT's FAQ page,
Q: Whenever I use the Ant jar or manifest related tasks, long lines in my manifest are wrapped at 70 characters and the resulting jar does not work in my application server. Why does Ant do this?
A: Ant implements the Java Jar file specification. Please refer to the notes section where it discusses the maximum allowable length of a line and the concept of continuation characters.
If a jar file produced by Ant does not work in your appserver, and that failure is due to the wrapped manifest, then you need to consult your appserver provider, as it is a bug in their appserver. Far more likely, however, is a problem in your specification of your classpath. It is not Ant's wrapping of your classpath that is the problem.
Do not raise a bug about this issue until you have checked to ensure that the problem is not due to your classpath specification.
Any idea?"will be searched ALSO."...
From: http://java.sun.com/docs/books/tutorial/ext/basics/load.html
Understanding Extension Class Loading
The extension framework makes use of the new class-loading mechanism in the JavaTM 1.2 platform. When the runtime environment needs to load a new class for an application, it looks for the class in the following locations, in order:
1. Bootstrap classes: the runtime classes in rt.jar and internationalization classes in i18n.jar.
2. Installed extensions: classes in JAR files in the lib/ext directory of the JRE.
3. The class path: classes, including classes in JAR files, on paths specified by the system property java.class.path. If a JAR file on the class path has a manifest with the Class-Path attribute, JAR files specified by the Class-Path attribute will be searched also.
[snip]
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