Help with runnin JAR files

java -cp smpp.jar:smscsim.jar com.logica.smscsim.Simulator
Can someone explain this line. Where do the jar files have to be located for this to work. also what is the function of the com.logica.smscsim.Simulator. Does it mean that the jar files should be in com.logica.smscsim. I try it and it gives me
Exception in thread "main" java.lang.NoClassDefFoundError: com/logica/smscsim/Simulator
And the Simulator.java file is in the com.logica.smscsim. The class path is set.
Here is a web site that i got this from: http://opensmpp.logica.com/CommonPart/Introduction/Introduction.htm
Thanks!

cp is an abbrieviation for classpath java -classpath .... is equivalent to java -cp. In your case, the jars contain the Simulator class. If you opened on with winzip or winrar you would find the Simulator class in com/logica/smscsim folder. It doesn't matter where the jar files are located. The line that you put on there, however, assumes that you are executing the java command from the same folder where the jars are.

Similar Messages

Oracle 9i: Help with loadjava jar files to call out web service from pl/sql

I'm trying to build a web service client using dbws_callout_utility.zip (version used for prio 10g database). I followed the articles in oracle site to loadjava jar files (soap.jar, dms.jar, ejb.jar, jssl-1_1.jar, mail.jar, servlet.jar) into Oracle DB 9i before invoke jpub to gen stub class and wrappers in oracle 9i but i have many errors such as ora-29534 and ora-29521. As consequence i could not invoke jpublisher to generate code.
Pls. help my with detail guide to overcome these errors, thanks in advance! My DB is Oracle 9.2.0.5

Dear,
I have read your article, it is useful for me. But I cannot Apply to my case. Please kindly help me. Thank you.
When running, the error occurs:
1:39:31 Execution failed: ORA-20000: soapenv:Server.userException - org.xml.sax.SAXParseException: Attribute name "password" associated with an element type "user" must be followed by the ' = ' character.
My webservice Url: http://abc.com.vn:81/axis/ABC_WS_TEST.jws?wsdl
I make PL/SQL (similiar as your example)
FUNCTION INVOKESENDMT
RETURN VARCHAR2
AS
l_request soap_api.t_request;
l_response soap_api.t_response;
l_return VARCHAR2(32767);
l_url VARCHAR2(32767);
l_namespace VARCHAR2(32767);
l_method VARCHAR2(32767);
l_soap_action VARCHAR2(32767);
l_result_name VARCHAR2(32767);
p_zipcode VARCHAR2(160);
BEGIN
--p_zipcode:='''TEST'' ; ''TEST'';''84912187098'';''84912187098'';''0'';''8118'';''1'';''000001'';''ThuNghiem'';''''';
p_zipcode:='TEST';
-- Set proxy details if no direct net connection.
--UTL_HTTP.set_proxy('myproxy:4480', NULL);
--UTL_HTTP.set_persistent_conn_support(TRUE);
-- Set proxy authentication if necessary.
--soap_api.set_proxy_authentication(p_username => 'TEST',
-- p_password => 'TEST');
l_url := 'http://abc.com.vn:81/axis/ABC_WS_TEST.jws';
l_namespace := 'xmlns="' || l_url || '"';
l_method := 'sendMT';
l_soap_action := l_url || '#sendMT';
l_result_name := 'sendMTResponse';
l_request := soap_api.new_request(p_method => l_method,
p_namespace => l_namespace);
soap_api.add_parameter(p_request => l_request,
p_name => 'user password sender receiver chargedflag servicenumber messagetype messageid textcontent binarycontent',
p_type => 'xsd:string',
p_value => p_zipcode);
l_response := soap_api.invoke(p_request => l_request,
p_url => l_url,
p_action => l_soap_action);
l_return := soap_api.get_return_value(p_response => l_response,
p_name => l_result_name,
p_namespace => l_namespace);
RETURN l_return;
END;

Help with creating jar file and running it ?

Hey guys,
I have a program with a package called classes and a sub-package called classes.mainLib.
I am trying to create a JAR file of the class files in mainLib. There is only one class file in classes and that contains the main method. So this is what i am doing:
1. create a manifest file with: Main-Class: classes.Cars
2. from within the mainLib directory (./program_name/classes/mainLib/) i do this:
jar cvf mainLib.jar manifest ./*.class
3. Then i move this jar file to ./program_name/lib and change directory to ./program name/
4. try to do this: java -jar ./lib/mainLib.jar
But it errors with:
gary@linuxbox:~/java/cars$ java -jar ./lib/mainLib.jar
Failed to load Main-Class manifest attribute from
./lib/mainLib.jar
Any ideas why this is happening. the manifest is included in the jar'ing
Thanks.

At a glance, it looks like you are placing only the
class files in the jar and trying to navigate your
classpath to run it. Instead, you have to place ALL
the package folders into the jar from the root of
your package hierarchy and the jar runs anywhere, in
any folder. The packages are INSIDE the jar.
also I see cars/classes in a path you describe ...and
the program seems to wnat classes/Cars ??? Could
this be an additional issue (or am I missing seeing
something about your package structure)?Firstly, i believe all my spelling and cases are correct.
I have the following strcuture:
Cars.class (contains main) : package classes in ./classes directory
All other classes : package classes.mainLib in ./classes/mainLib
I would like to jar ALL files in mainLib but not the class that contains the main method. Is this possible?
I'm not sure how clear i was earlier, hope this is more understandable.

Help with Using JAR files

I'm attempting to run a Java program that is contained in a .JAR file. The problem is not with that .JAR but with referencing a second .JAR for support classes. The problem is that I've created a support .JAR with two classes: Compute and Task called "Compute.jar". I've created a second class "ComputeEngine.jar" (in case you're wondering, this is the RMI example from the Sun website). I'm trying to compile this in XCode (Mac OS X IDE) which I'm not too familiar with but getting the hang of it.
I've gotten far enough to reference the Compute.jar in the compiling and building of ComputeEngine.jar but when I run the ComputeEngine.jar, I get nothing. So I use a terminal window to run the ComputeEngine.jar with "java" command. Here's what happens:
I enter: java -cp /Developers/Projects/Compute/build/Compute.jar -jar "ComputeEngine.jar"And I get an error: Exception in thread "main" java.lang.ClassDefNotFoundError: compute/ComputeI'm not sure why this is happening. Here is the jar tf Compute.jar output:
META-INF/
META-INF/MANIFEST.MF
compute/
compute/Compute.class
compute/Task.classAnyone have a clue?
Thanks
Matt

Thanks for the prompt response. Forgive my ignorace, but I'm new to JARs (actually wouldn't have been using it but for the fact that XCode defaults to that type of target). How do I specify the classpath in my jar? And which jar are we talking about? The Compute.jar or the ComputeEngine.jar?
Thanks again.

Help with signing jar files

hi,
Iam trying to let a applet do file acces on a client. Therefore I must sign a applet so it may access the filesystem. This works, but the code keeps screaming about security violations.
Now ive vopied the code from a example from Oracle and I found one difference.
next to the fileUploader class that I also have in my jar file there is a
FileUploader$1.class with the following code:
import oracle.ewt.thread.Task;
import oracle.ewt.thread.TaskEvent;
final synchronized class FileUploader$1 implements Task
    private final FileUploader this$0 = fileUploader;
    private final boolean val$nf = flag;
    private final Object val$val = object;
    public void runTask(TaskEvent taskEvent)
        FileUploader.access$0(this$0, val$val, val$nf);
    FileUploader$1(boolean flag, FileUploader fileUploader, Object object)
}but if I try to compile this code then I get all sorts of error telling me Iam missing vars and methods.
Can anyone tell me why this class is there and what it does and if its nessesary for the fileaccess then how can I create it

hi,
Iam trying to let a applet do file acces on a client.
Therefore I must sign a applet so it may access the
filesystem. This works, but the code keeps screaming
about security violations.
Now ive vopied the code from a example from Oracle and
I found one difference.
next to the fileUploader class that I also have in my
jar file there is a
FileUploader$1.class with the following code:
import oracle.ewt.thread.Task;
import oracle.ewt.thread.TaskEvent;
final synchronized class FileUploader$1 implements
Task
private final FileUploader this$0 = fileUploader;
private final boolean val$nf = flag;
private final Object val$val = object;
public void runTask(TaskEvent taskEvent)
FileUploader.access$0(this$0, val$val,
al$val, val$nf);
FileUploader$1(boolean flag, FileUploader
der fileUploader, Object object)
}but if I try to compile this code then I get all sorts
of error telling me Iam missing vars and methods.
Can anyone tell me why this class is there and what it
does and if its nessesary for the fileaccess then how
can I create it
a Name1$Name2.class file is generated from an inner class Name2 in a class Name1.
in your case you want to look at and compile FileUploader.java. This will then generate any inner class FileUploader$innerclass.class files necessary

Help with Java JAR file opbfuscation.

I am looking for a free (no $) for use on commercial java code
code obfuscation program, which can beat the Jode decompiler.
I have tried Proguard, and I have tried Joga
(using Jode itself for obfuscation is too complex for my purposes).
Is there a simple way to beat decompilers like Jode and DJ,
without a financial outlay if possible,
given how easy it is to decompile Java bytecode?

All interesting remarks, everyone!
Proguard doesn't prevent decompilation on something very small, like a jar
with one or two classes.
Proguard is free(no money) for use over commercial java code,
and is itself a java jar, so it will run on Windows,
Mac and Linux platorfms.
It also correctly obfuscates and links external java libraries
and references to the man jar/class in a very systematic way.
I'm just wondering if there is something similar to proguard on licensing arrangements,
working over small amounts of code, and beating
the decompilers (like Jode).
I have used the code obfuscation that Dr.Java performs on it's classes during compilation.
And while the resulting class file tested does confound Jode,
JD-Gui ("Java decompiler") instantly beats the results of Dr.Java.
Considering how easy it is to break class files, I was figuring that either Sun
or another would offer a free/open source/cheap way to secure these class files,
without resulting to Zelix Klassmaster, and instead of leaving a mess
of decompiled source code, prevent decompilation of java byte
code even happening at all?
Any ideas?
Edited by: Zac1234 on Jul 5, 2009 10:55 PM

Help with ejb-jar file

Hello everybody;
Have any of you read the article "HOWTO: Use a BC4J Application Module in a Stateless EJB Session Bean" ?
Well, what I am trying to do is a Stateles CMT Session Bean with more than 1 method, and my question is what can I do in order to specify the container that I am going to use a container transaction per each method in my EJB Session bean.
I hope you read it, because I am clueless in al this stuff!

The EJB JAR DTD looks like this visually:
So you can include multiple <method> element siblings as the child of a <container-transaction> element.

I need help with a PDF file that is an image, the "Read Out Loud' option does not work, please help!

I need help with a PDF file that is an image, the "Read Out Loud' option does not work, please help!

You mean an image such as a scanned document?
If that is the case, the file doesn't contain any text for Reader Out Loud to read. In order to fix that, you would need an application such as Adobe Acrobat that does Optical Character Recognition to convert the images to actual text.
You can also try to export the file as a Word document or something else using ExportPDF which I believe offers OCR and is cheaper than Acrobat.

HELP!!! Could someone help me with a jar file issue and JRE 1.3 & 1.4

We had a problem with the last Oracle patch in that it tried to extract from a jar file using the "jar" executable. But the jar executable is not installed on the server where we have JRE 1.4
On one server, Jar.exe is installed where we have JRE 1.3. Is the jar.exe apart of JRE 1.4? If so, where do I find the jar.exe file? If it's not part of JRE 1.4, what do I need to do to get the jar.exe onto the server where JRE 1.4 is installed?
Thanks, Carl

Thanks for your replies.
I know that a jar file is like a zip file but I'm asking, "Can you download just the jar.exe without downloading the JDK?"
I keep reading everywhere that you can only get the jar.exe tool if you download the JDK but I can't use JDK(because it is a compiler) on our website here at work.
Thanks,
Carl

HELP!!! Could someone help me with a jar file issue and JRE 1.3 and JRE 1.4

We had a problem with the last Oracle patch in that it tried to extract from a jar file using the "jar" executable. But the jar executable is not installed on the server where we have JRE 1.4
On one server, Jar.exe is installed where we have JRE 1.3. Is the jar.exe apart of JRE 1.4? If so, where do I find the jar.exe file? If it's not part of JRE 1.4, what do I need to do to get the jar.exe onto the server where JRE 1.4 is installed?
Thanks, Carl

The jar tool isn't part of the jre but the jdk. You should find it on your server in %ORACLE_HOME%\jdk\bin (seems you use some kind of Windows).

Please help, cannot connect to Access database with a jar file

Hi, i created a jar file from my java project, using eclipse.
When i try open the jar through command prompt, the following error is given:
java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver] Could not find
file '(unknown)'.
at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
at sun.jdbc.odbc.JdbcOdbc.SQLDriverConnect(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)
at sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at Methods.con(Methods.java:15)
at LoginScreen.getCmboLogins(LoginScreen.java:80)
at LoginScreen.getJContentPane(LoginScreen.java:65)
at LoginScreen.initialize(LoginScreen.java:46)
at LoginScreen.<init>(LoginScreen.java:31)
at DataUse.main(DataUse.java:25)
No Connection to dataBASE
The program runs fine within eclipse and the database is bundled in the jar.

rohangr wrote:
The program runs fine within eclipse Because the database isn't in the jar.
...and the database is bundled in the jar.That isn't going to work.
The MS ODBC driver (which has absolutely nothing to do with java) expects to find the MS Access file in the windows file system.
And the contents of the jar file does not fit into that requirement.

Little Mailprogramm works in JBuilder but do not work with a JAR File

Hallo !
The application works in JBuilder, but if I make an archive it dont work. If have included "JavaMail" and "JavaBeans Activation Framework". (same as in the JBuilderProject)
The Error Message is:
class javax.mail.MessegingException: IOException while sending message; nested exception is:
javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed;
at javax.mail.Transport.send0
at javax.mail.Transport.send
I have other applications which work on JBuilder an as Jar-File, but why this application not ?
I have JBuilderProfessional in use.
Are there some licenceproblems with "JavaBeans Activation Framework".
Please help me.
Thank you !
Wolfgang

I think I have found a solution here:
http://forum.java.sun.com/thread.jsp?thread=74127&forum=43&message=519108

How to bundle java help class into jar file ?

Hi, all,
I have some package in my project, with which I have a java help jar file as classpath, when I run my project, I need the jh.jar file in directory /jar/jh.jar.
Now, I bundled all my class packages into a jar file, my.jar, together with the /jar directory. When i run my jar file with command:
java -jar my.jar
It tells me couldn't find javahelp class.
What shall I do? How can I create my jar file with the jh.jar?
Thanks in advance.

I think you'd be better off just adding the jh.jar as
a classpath argument and running it like that:
java -classpath /myjavalibdir/jh.jar -jar myjar.jar
...otherwise you're stepping into redistribution of
binary issues licensing-wise. That won't work either; when you run java with the -jar option, it ignores both the -classpath option and the CLASSPATH environment variable. However, it will see jh.jar automatically if you put it in the <path-to-java>/jre/lib/ext directory. But for distribution purposes, it might be simpler just to combime the contents of jh.jar into myjar.jar (if you use Ant, its <jar> task makes that very easy). Or, you can just run it this way:java -classpath myjar.jar;jar/jh.jar MyMainClassBTW, I don't think redistribution is a problem; otherwise how anyone even use JavaHelp?

Problems with signed JAR files in JWS/JRE6 environment.

Hello All,
I'm encountering a problem running our desktop application as a Java Web Start deployment in a JRE 6 environment. There were never any problems when running the same application as a JWS deployment in JRE 1.4, or 5, environments. There are also currently no problems in a JRE 6 environment when running the application as a standard desktop application.
The problem which I am having has nothing to do with launching the application. But for good measure, I verified the JNLP file with JaNeLA. A couple things we out of order, which I addressed to make JaNeLA happy, but my problem still persists. Here is my JNLP file (anonymized to protect the innocent):
TS: 2010-10-18 17:04:46
<?xml version="1.0" encoding="UTF-8"?>
<jnlp codebase="$$codebase" href="$$name">
     <information>
          <title>Acme Desktop</title>
          <vendor>Acme Corporation</vendor>
          <homepage href="http://www.acme.com/"/>
          <description>Acme Client for Acme Server</description>
          <description kind="tooltip">Acme Client for Acme Server</description>
          <icon href="desktop.gif"/>
          <offline-allowed/>
     </information>
     <security>
          <all-permissions/>
     </security>
     <resources>
          <j2se version="1.5+"/>
          <jar href="acmedesktop.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/antlr-2.7.2.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/backport-util-concurrent.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/commons-codec-1.3.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/commons-httpclient.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/commons-logging.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/acmeapi.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/HelpJavaDT.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/HelpJavaDT_es.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/jacorb.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/Multivalent.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/slf4j-api-1.5.6.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/slf4j-jdk14-1.5.6.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/snow.jar" download="lazy" version="8.00.01.00+"/>
          <jar href="lib/AcmeTMClient.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/xercesImpl.jar" download="eager" version="8.00.01.00+"/>
          <jar href="lib/xml-apis.jar" download="eager" version="8.00.01.00+"/>
          <extension name="installer" href="desktopInstaller.jnlp" />
          <extension name="Java Help" href="help.jnlp"/>
          <property name="java.library.path" value="./lib"/>
          <property name="admin" value="false"/>
          <property name="webstart" value="true"/>
          
     </resources>
     <resources os="Windows">
          <nativelib href="lib/jniWin32.jar" version="8.00.01.00+"/>
     </resources>
     <application-desc main-class="desktop"/>
</jnlp>-----
When running as a JWS deployment, on JRE 6, the application will be functioning normally for a little while, and then suddenly the following exception is thrown, and the current operation fails because the class in question cannot be accessed:
java.lang.SecurityException: class "acmeapi.communication.CDocImpl"'s signer information does not match signer information of other classes in the same package
     at java.lang.ClassLoader.checkCerts(ClassLoader.java:807)
     at java.lang.ClassLoader.preDefineClass(ClassLoader.java:488)
     at java.lang.ClassLoader.defineClassCond(ClassLoader.java:626)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
     at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
     at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
     at com.sun.jnlp.JNLPClassLoader.findClass(JNLPClassLoader.java:288)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
     at acmeapi.common.CDoc.getAnnotationsInfo(CDoc.java:493)
     at acmedesktop.communication.CCommunicationManager.privateGetAnnotations(CCommunicationManager.java:1976)
     at acmedesktop.communication.CCommunicationManager.getAnnotations(CCommunicationManager.java:1828)
     at acmedesktop.annotations.CViewAnnotations.getAnnotations(CViewAnnotations.java:826)
     at acmedesktop.annotations.CViewAnnotations.createView(CViewAnnotations.java:583)
     at acmedesktop.annotations.CViewAnnotations.setData(CViewAnnotations.java:736)
     at acmedesktop.annotations.CViewAnnotations.init(CViewAnnotations.java:205)
     at acmedesktop.hitspanel.CHitsPanel.viewAnnotations(CHitsPanel.java:281)
     at acmedesktop.hitspanel.CHitsTab$3.mousePressed(CHitsTab.java:316)
     at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
     at java.awt.Component.processMouseEvent(Component.java:6260)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
     at java.awt.Component.processEvent(Component.java:6028)
     at java.awt.Container.processEvent(Container.java:2041)
     at java.awt.Component.dispatchEventImpl(Component.java:4630)
     at java.awt.Container.dispatchEventImpl(Container.java:2099)
     at java.awt.Component.dispatchEvent(Component.java:4460)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4235)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
     at java.awt.Container.dispatchEventImpl(Container.java:2085)
     at java.awt.Window.dispatchEventImpl(Window.java:2478)
     at java.awt.Component.dispatchEvent(Component.java:4460)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)-----
The classes of our desktop product are contained within the 'acmedesktop' and 'acmeapi' packages. It requires access to the hard drive of the workstation, and therefore, all jar files included with the application are signed using the following ANT task when compiled:
<signjar keystore="resources/codesigning/keystore.pfx" storetype="pkcs12" storepass="myPassword" alias="myAlias">
     <fileset dir="${jws_dist}/app" includes="*.jar"/>
     <fileset dir="${jws_dist}/app/lib" includes="*.jar" excludes="jhall__V${dt_version}.jar"/>
</signjar>-----
Therefore, all classes, within all jar files, are signed with the same certificate (with the exception of the JavaHelp libraries, which are already signed by Sun - but the class in question attempting to be loaded here is not contained within the JavaHelp jar file anyway). So, the point being, that the exception message stating that the "signer information of the acmeapi.communication.CDocImpl class doesn't match the signer information of other classes in the same package", is simply not correct. All classes within that jar file were signed using the same certificate.
I downloaded the JRE 6 source from dev.java.net and picked through this issue with a debugger. The ClassLoader.checkCerts() method compares the certificate used to sign the current class which is attempting to be loaded, with the certificates which signed all other previously loaded classes within the same package. If they don't match, the exception above is thrown. What is causing the issue is when the checkCerts() method attempts to get the certificates which signed the currently loading class, null is returned. And obviously, comparing null, with an array of the certificates which signed the previously loaded classes, isn't going to match; therefore this exception is thrown.
The checkCerts() method gets the certificates of the currently loading class by calling the java.security.CodeSource.getCertificates() method. Tracing deeper in the debugger, the CodeSource object ultimately gets the certificates from the 'signersRef' member variable of the com.sun.deploy.cache.CachedJarFile class. signerRef is a SoftReference object and can therefore be garbage collected at some point. If it has already been garbage collected, the CachedJarFile class will attempt to retrieve it again from the loaded cache entry by calling com.sun.deploy.cache.MemoryCache.getLoadedResource().
The MemoryCache class maintains the cache entries to the jar files as MemoryCache.CachedResourceReference objects, which subclass WeakReference, and therefore these objects can be garbage collected as well. If the cache entries have also been garbage collected, this leaves the CachedJarFile class with no ability to repopulate the CachedJarFile.signerRef object. Therefore it is completely out of luck getting the certificates which signed the currently loading class, which ultimately causes the above exception.
When the com.sun.deploy.cache.Cache class attempts to retrieve a cache entry using its getCacheEntry() method, it will attempt to get the entry from the MemoryCache class, if null is returned, it will recreate the cache entry and add it back to the MemoryCache. In contrast, when the CachedJarFile class attempts to get a cache entry from the MemoryCache class, if null is returned, it just gives up.
(from com.sun.deploy.cache.CachedJarFile:244)
private CacheEntry getCacheEntry() {
     /* if it was not created by Cache do not search for entry */
     if (resourceURL == null)
          return null;
     CacheEntry ce = (CacheEntry) MemoryCache.getLoadedResource(resourceURL);
     if (ce == null) {
          //This should not happen because CacheEntry should not get collected
          // before CachedJarFile is collected.
          Trace.println("Missing CacheEntry for " + resourceURL + "\n" + ce,
               TraceLevel.CACHE);
     return ce;
When debugging, code execution falls within the code block with the comment stating "This should not happen...", but it is happening in my case.
On an interesting side note, using the jvisualvm.exe tool included with JDK 6, I was able to tell that it seems as though these objects are collected the first time that the JVM allocates more heap space, and then the issue will occur. If I set the initial heap size very large (using -Xms) this issue won't occur at all. But that is kind of a bad solution which I would rather not do, but it is interesting to note for the sake of troubleshooting this issue. The max heap size (-Xmx) is plenty big enough, so the issue is not that we are running out of memory here.
Does anyone have any insight as to what could be causing this? I've searched, and found a couple threads with similar problems but with no clear solutions. It is not just one workstation either, it happens everywhere I deploy the app as a Java Web Start application in a JRE 6 environment. I have been using version 1.6.0_18 on XP, but it seems to happen on any update version of 1.6. Is the fact that the CachedJarFile class doesn't attempt to reload the resource when it can't retrieve it from MemoryCache a bug? I've dug as deep as I can on this and I'm at wits end, does anybody have any ideas?
Thank you
Jake
Edited by: jkc532 on Nov 12, 2010 10:35 AM

jkc532 wrote:
.. Is the fact that the CachedJarFile class doesn't attempt to reload the resource when it can't retrieve it from MemoryCache a bug? From your comprehensive investigation and report, it seems so to me.
..I've dug as deep as I can on this and I'm at wits end, does anybody have any ideas?Just after read the summary I was tired, so I have some understanding of the effort you have already invested in this (the 'wits' you have already spent). I think you should raise a bug report and seek Oracle's response.

Help---- creation of jar file

hi,
i have developed a application with swing concept and mysql as my database... now i am trying to create jar file for my application... in the manifest file i have given like this:
class-path: C:\Program Files\MySQL\mysql-connector-java-5.0.4-bin.jar;C:\Program Files\Java\jdk1.5.0\bin;
Main-Class: Login
but still it throws an exception that main class: could not be found:
can any one help me...
Thank u in advance..
Abdul

For a classpath it is easy to forget to add code]//.;[ to the classpath and you also want to add %CLASSPATH%; as well
example classpath=.;%CLASSPATH%;...........rest of libs/jars the dot tells jvm to search current directory just like in DOS
Sean

Help with runnin JAR files

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