Dont Ask Again if I Want to Run Jnlp

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Java™ Web Outset version vi

Frequently Asked Questions (FAQ)

These documentation pages are no longer current. They remain available for archival purposes. Please visit https://docs.oracle.com/javase for the most upward-to-date documentation.

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FAQ Update (March 2006)

General Questions

1. What is Coffee Web Get-go?
2. Where do I become more than data?
3. Why should I use Java Web Beginning?
4. How can I launch applications with Java Web Start?
5. Does it matter how I launch an application?
6. What are the system requirements for Java Web Start?
7. What platforms does Java Web Start run on?
8. What are the server requirements for Java Spider web Beginning?
9. Is Java Web Beginning based on a standard?
10. Can I implement my own Java Web Start?
11. What are the supported browsers?
12. Is there a comprehensive list of online resource for Java Web Start?
13. Can I deploy any application with Java Web Start?
14. Is Java Web Beginning a software distribution mechanism like Marimba and MS SMS?
15. Is Coffee Web Start an application installer?
16. What version of the Java platform does Coffee Spider web Start work with?
17. How does Coffee Spider web First relate to Java Plug-in Engineering (applets)?

Technical Questions

1. Do I need to change my application to work with Java Web Start?
2. Is there a migration path from applets to applications?
3. Is there a manner to pass VM arguments to the Coffee Runtime?
4. I don't desire to rely on a server timestamp. How can I specify a versioned JAR and how can I get incremental updates of JARs?
5. Are JAR files shared between applications?
6. How can I provide my ain splash screen?
7. How can I save the awarding state on the local arrangement?
8. My application requires a specific version of the JRE. How practice I specify this my JNLP file?
9. Can I rely on Form-Path in the manifest file?
10. Can I use Java Web Commencement even if my Application depends on or uses native code?
11. How can I load resources inside my awarding using Form.forName and ClassLoader.getSystemClassLoader?
12. How can I launch Java Web Kickoff from the command line?
13. How do I use multiple JAR files signed by different certificates?
14. How do I detect if Java Spider web Start is installed?
15. Why does my browser shows JNLP file as plain text.
16. Why does Coffee Web Beginning always reload JAR files from IIS server?
17. Can I use Pack200 compression with the JnlpDownloadServlet?
18. What is the best way to ensure simply one instance of my app is run?
19. When volition backdrop set in the jnlp file become set?
20. What causes the file not found message for the downloaded jnlp file?
21. How tin I use signed jars (such every bit JCE extensions) signed for other purposes?
22. Why tin't I use the Clan feature on some linux platforms with Gnome?
23. How practice I ready upwardly my server to broadcast the jnlp mime type?
24. How do I ready my server to apply the JnlpDownloadServlet?
25. How are Applications uniquely identified?
26. How do I create multiple file-extension/mime-type associations with a JNLP application?
27. Why does FindClass() sometimes fail when called from native code?

Security Questions

1. How secure is Coffee Web Showtime?
2. What is a secure sandbox?
3. How is the Java Web Starting time secure sandbox more flexible than the applet sandbox?
4. How tin can I enable my awarding to gain unrestricted access to the organization?
5. Is there support for encrypted download of JAR files?
6. Can I employ NTLM hallmark with Coffee Web Start?
7. Can I use HTTPS protocol with Java Web Outset?
8. Are in that location online resources to acquire more than near the security tools?

Known Bugs

1. 4825415: Web Kickoff desktop integration and security dialogs disappear in i.4.2
2. 4491398: Dependent DLL resource problem
3. 5008460: Web Start fails if path contains spaces and TraceSecurity is turned on.
4. 5074087: If related-content is specified w/o a title on Windows, application cannot commencement.
5. 5074524: First jar of unsigned extension must be downloaded eagerly
6. 5047548: Lazy downloading of parts with packages is broken
7. 5074526: ExtenededService file APIs testify security dialog fifty-fifty if app is signed
8. 4925768: No support for system level shortcuts in Gnome.
9. 5072969: Startup errors causing Spider web First to announced to hang
10. 5074530: Web Start not picking up the correct JRE.

March 2006 Updates:

General Questions

What is Java Web Offset?

Java Spider web Kickoff provides a platform-independent, secure, and robust deployment applied science. It enables developers to deploy full-featured applications to end-users by making the applications available on a standard web server. With any spider web browser, cease-users can launch the applications and be confident they ever have the near-contempo version.
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Where practise I get more information?

Look at the online documentation for Java Spider web Outset .

If you are a developer, go to the Developer'south Guide for detailed technical information on how to deploy applications using Coffee Web Start.
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Why should I use Java Web Start?

It'south an easy, robust, and secure manner to deploy applications straight from the web. Developers tin can make applications readily bachelor via the web. In improver, Coffee Web Showtime provides Java runtime surround (JRE) management capabilities, it's easy to set up, information technology's browser-independent, and it's an efficient way to deploy web application solutions.

Users can easily access applications much equally they would a web page--without a split installation step. From the desktop, users can access and apply Java applications, using a richer and more responsive user interface than is available on a web page. And, in one case a Coffee Web Commencement based application is installed, users simply click to run the application whenever needed.

Users practice not need to manually update applications considering each time they launch an application, information technology is transparently updated from the web--and then they always use the most recent version available.
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How tin can I launch applications with Java Web Offset?

You initially launch a new application by clicking on a link from a spider web page.

If you lot use an application oftentimes, create a shortcut from your desktop or from the Get-go Menu past allowing Java Web Commencement to place an icon on your desktop. Java Web Start may ask if y'all would like to create
shortcuts or an entry in the Start Menu. If you say "yes," all time to come launches of the application can get-go without a browser.

Java Spider web Kickoff also provides an Application Cache Viewer which you can launch from the Coffee Command Panel.  The Cache Viewer enables yous to directly launch applications y'all accept downloaded.

Y'all can also launch an application from a command prompt past typing "javaws <jnlp_url>" where <jnlp_url is a url to the jnlp file of the application.
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Does it matter how I launch an application?

No, applications launch in the same style no matter which method yous use: from a web folio, from the shortcut on the desktop, from the Start menu, or through the Java Application Cache Viewer.

Coffee Web Beginning always checks to see if a newer version of the application is available for utilize and automatically downloads it if and then.

If the awarding you are using has non been digitally signed, Java Web Commencement will launch it in a restricted and secure execution surround. An application that is not signed, or ane that yous do not trust, volition never be run with unrestricted admission to your local system or network.
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What are the organisation requirements for Java Web Start?

Any customer organization that supports the Coffee version ane.ii.two or higher can use Java Web Beginning. Java Web Start works with virtually all browsers.
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What platforms does Java Web Commencement run on?

Sunday Microsystems provides versions for Windows 98/NT/2000/XP/2003, Solaris Operating Environment (SPARC and Intel editions) and Linux/i486. Apple provides a version for their OS X release.
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What are the server requirements for Java Web Offset?

Java Spider web Offset uses HTTP for advice between the client and the server. You tin can use a standard web server to host an application. If y'all require boosted services, such as version-based downloading, incremental updates, or pack200 compression for your applications, the web server will need to support servlets or Java Server Pages. A sample servlet implementing these features is provided in the samples directory of the JDK.
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Is Java Spider web Showtime based on a standard?

Yes. Java Spider web Start ane.5.0 is the product-quality reference implementation of Java Network Launching Protocol (JNLP) technology, which was developed through the Java Community Procedure.  JNLP is specification number JSR 056.  Other platform vendors are encouraged to port Java Spider web Get-go to their platform or implement the specification.

For more information, see the JNLP specification.
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Can I implement my ain Java Web Start?

The underlying engineering for Coffee Web Start, the Java Network Launching Protocol and API is being developed through the Java Customs Procedure, then yous tin implement this protocol in whatsoever product. Still boosted licensing and terms must be met to implement any JCP technology including the JNLP engineering.
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What are the supported browsers?

Coffee Spider web Start supports primarily Net Explorer four or higher and Mozilla. However any browser tin can launch JNLP files if you have prepare the MIME-type association correctly. Java Web Start uses the browser's settings and may launch a browser to show a URL; this characteristic may not piece of work with unsupported browsers.
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Is there a comprehensive listing of online resources for Java Spider web Start?

• Java Web Start documentation folio

• : Developer's Guide

• Java Web Start Discussion Forums: Oracle Forum Domicile

• JSR-56: http://jcp.org/en/jsr/item?id=56

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Tin I deploy whatsoever application with Java Web Beginning?

Coffee Spider web Showtime is an application launcher for Java applications that are written to be web-deployed.

An awarding must exist delivered in a set of JAR files and all application resources, such as images, configuration files, and native libraries must be included in the JAR files. The resources must be looked up using the method ClassLoader.getResource() or an equivalent method. Java Spider web Showtime but transfers JAR files from the web server to the customer.

If an application is written to run in a restricted execution environment (sandbox), then access to disk is not permitted and the application may only connect to the host on which information technology resides.
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Is Java Web Start a software distribution machinery like Marimba and MS SMS?

Java Web Start is an application launcher for Java applications. It allows like shooting fish in a barrel distribution of full-featured applications based on the Coffee platform from a web server to a client machine with minimal user interaction.

The software distribution technology is simply one aspect of Coffee Web Start. It also provides security, updates to the applications, ease-of-use for terminate users, and flexibility for developers when they create the applications.
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Is Java Spider web Beginning an application installer?

Java Web Kickoff is an application launcher for Java applications that are written to be web-deployed. Java Web Get-go caches resources locally on the disk, but as well provides a secure execution environment and a about transparent updating facility for applications. The end user does non need to manually initiate a software update because the application is updated each time it is used.
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What version of the Java platform does Java Spider web Start piece of work with?

Java Web Get-go launches only applications written for the Java platform versions 1.2.2 and higher.
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How does Java Web Start relate to Java Plug-in Technology (applets)?

The two approaches are very similar. The key difference is in the user experience. If the Java application/applet needs to interact with a spider web page and be tightly leap to a web browser, then applets may exist the solution. On the other hand, if browser independence is of import, and then Coffee Web Outset is the deployment platform of choice. There are a number of other differences, but this is the fundamental difference.

Java Plug-in technology enables users to run Java applets inside a browser.

Java Web Start enables users to download full-featured applications with any browser. One time they take downloaded and launched an awarding, the browser can be closed, while the application continues working. The application does non depend on an open browser to role. The browser can be close downward or you tin go to a different web page and the application will go along running.
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Technical Questions

Exercise I need to change my application to piece of work with Java Web Start?

If your application is written to the Coffee two platform, and is delivered as a set of JAR files, in that location should be no need to revise your application.  Make sure that your awarding retrieves all its resource (such as images and resources bundles) from a JAR file, since Java Web Start launches an application by invoking the public static void main(String[] args) method.

If your application needs unrestricted access to the organisation, (for instance, network or disk access), you volition need to sign your lawmaking.
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Is there a migration path from applets to applications?

Java Spider web Start is primarily designed for application deployment. You specify all requirements for your application in the JNLP file, and off you lot go. It does provide the power to launch applets in much the same way as the traditional AppletViewer. The built-in AppletViewer provides an like shooting fish in a barrel migration path for existing applets that want to take advantage of Java Web Commencement. However, information technology is not intended to be a full implementation of the Plug-In. The Plug-In is the master launching vehicle for applets. The built-in AppletViewer in Java Web Outset has  limitations, for case, you lot cannot specify class files as resources and it does not have policy files.
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Is in that location a style to pass VM arguments to the Java Runtime?

Java Web Commencement allows certain JVM flags to exist prepare with the coffee-vm-args attribute of the j2se element (run across Developer's Guide). Allowing the consummate fix could compromise security also every bit limit portability across dissimilar platforms and implementations. Y'all can fix the maximum and initial heap size using the initial-heap-size and max-heap-size attributes of the j2se element, for example:

<j2se version="..." max-heap-size="100M"/>

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I don't want to rely on a server timestamp. How can I specify a versioned JAR and how can I get incremental updates of JARs?

Java Web Start supports versioned JARs and incremental updates. You can specify exact versions of the JAR files y'all desire, instead of relying on timestamp information to determine if an update is available. Using version IDs too allows you to provide incremental updates from 1 version to another. See the JNLP Specification or the Programmer's Guide for details.
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Are JAR files shared betwixt applications?

Each JAR file that a JNLP Client (such every bit Java Web Start) downloads, is uniquely identified with a URL. If two JNLP files use the aforementioned URL, and then the resource will but be downloaded once and shared. This is similar to the caching implementations used by spider web browsers.
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How can I provide my own splash screen?

Java Web Beginning needs to put up the initial splash screen while Java is loading. For subsequent access, you lot can specify an image file to use for the splash screen in the JNLP file with the tag

<icon href="mysplash.jpg" kind="splash"/>          

where mysplash.jpg is the image file for your splash screen.  The outset time your application runs, it volition use the standard splash screen. Later that, it volition use the image you lot provide.
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How tin I save the awarding land on the local organization?

A sandboxed awarding can store land using the PersistenceService API. This API is similar to cookies for HTML pages. Thus, it is a secure way to shop persistent information on the client reckoner.  For more data, see:

• JNLP Specification

• Java Spider web First Developers Guide

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My application requires a specific version of the JRE. How exercise I specify this my JNLP file?

The tag <j2se version="versionNum"> specifies a platform version, where versionNum is one.2, i.three, ane.iv, or 1.5.

Y'all can request a specific product version by including a vendor URL in the href aspect. For Oracle's JREs, the URL is http://javadl.sun.com/webapps/jawsautodl/AutoDL/j2se For example, the following J2SE tag will request any Sun one.three.one implementation:

<j2se version="i.3.1*" href="http://javadl.sunday.com/webapps/jawsautodl/AutoDL/j2se"/>          

You tin see all the versions of the installed JREs in the Java tab of the Java Control Panel.
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Can I rely on Class-Path in the manifest file?

Java Web Start does not back up the Form-Path entry in the manifest file. The Class-Path attribute is entirely file-centric, whereas Java Web Offset and JNLP is web-centric, i.east., based on URLs. Thus, the ii models practice not merge easily.

Instead of relying on the Class-Path entry, you can listing multiple JAR files in the JNLP file, for example:

<resource>  <jar href="A.jar"/>  <jar href="B.jar"/> </resources>          

In a JNLP file, you can factor out dependencies on a fix of JAR files to another JNLP file using the <extension... > element. Thus, you tin attain the same kind of re-usability and ease of maintenance equally you lot exercise with the Class-Path entry. This characteristic is described in the specification.

JNLP also implements a just-in-time downloading mechanism, like to applets. For each resources in a JNLP file, yous can specify which parts should be eagerly or lazily downloaded.  Eagerly loaded resource are loaded earlier the application is launched, lazily loaded resource later.  Default is eager download. Furthermore, the specification includes an API for which yous tin programatically query Java Web Start well-nigh which resources are available and request them to be downloaded. Thus, you tin can write download/network aware applications.

Meet the JNLP specification for more than information.
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Tin can I employ Java Web Outset fifty-fifty if my application depends on or uses native code?

Yous can apply Coffee Spider web Start to deploy Java Technology-based applications that depend on native lawmaking such every bit DLLs and SOs. Utilize the <nativelib ...> element to specify required native libraries. See the Developer's Guide for details.
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How can I load resource within my application using Class.forName and ClassLoader.getSystemClassLoader?

Java Web First uses a user-level classloader to load all the application resource specified in the JNLP file. This classloader implements the security model and the downloading model defined past the JNLP specification. This is no different than how the AppletViewer or the Coffee Plug-In works.

This has the, unfortunate, side-effect that Class.forName will not find whatever resources that are defined in the JNLP file. The aforementioned is true for looking upwardly resource and classes using the arrangement grade loader (ClassLoader.getSystemClassLoader).

To find application resources in Java Web Offset, use the classloader that loaded your application, for example apply the following call in the in the awarding;southward main thread:

this.getClass().getClassLoader();

You can likewise use:

Thread.getCurrent().getContextClassLoader();
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How can I launch Java Web First from the control line?

You can launch Java Web Offset from the command line as follows:

javaws [options]            your-app-JNLP-URL          

where your-app-JNLP-URL is the location of your awarding's JNLP file.  For example:

javaws http://docs.oracle.com/javase/tutorialJWS/deployment/webstart/examples/Notepad.jnlp          

For complete command line syntax run across: the Developer's Guide
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How practise I utilise multiple JAR files signed by dissimilar certificates?

The JNLP 1.0 specification requires all JAR files used in a JNLP file to be signed past the same certificate. This restriction avoids requiring the user to accept multiple certificates from the same source, and enables Java Web Start to know if the user has accepted all certificates used for an application.

However, Java Web Start can employ multiple JAR files signed by different certificates, by using the component extension machinery and multiple JNLP files.  The simply requirement is that the JAR files contain code from different packages.  Then, instead of the following:

<jar href="myjar1.jar"/> <jar href="jh.jar"/>          

Use the following:

<jar href="myjar1.jar"/> <extension proper name="Coffee Aid" href="assist.jnlp"/>          

Then add a help.jnlp file with the following contents:

<?xml version="ane.0" encoding="utf-8"?>  <jnlp spec="1.0+" codebase="http://ws503" href="Help.jnlp">  <information> <title>JavaHelp</title> <vendor>Sun Microsystems, Inc.</vendor>  </data> <resources> <jar href="jh.jar"/> </resources>  <component-desc/> </jnlp>          

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How do I detect if Java Web Kickoff is installed?

Y'all can write a short JavaScript or VBScript to find if Java Web Start is installed. Meet the Programmer's Guide for details.
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Why does my browser shows JNLP file as plain text ?

This is almost likely happening because your web server is not aware of the proper MIME blazon for JNLP files. Java Web Start requires only one change to your web server, that is creating an association between the file extension, typically jnlp, and the MIME blazon, application/x-java-jnlp-file. The steps for doing this vary depending upon the web server you are using.

Furthermore, if your corporation uses a proxy server, ensure that the update versions of the files are returned, by updating the fourth dimension stamp of the resources on the spider web server such that the proxies volition update their caches.
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Why does Java Spider web Start always reload JAR files from IIS server?

If a timestamp of the file on the IIS server is in the future IIS returns current-time as last-modified fourth dimension. This makes Java Web Get-go to reload the JARs since time-postage stamp is always newer.
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Can I utilise Pack200 compression with the JnlpDownloadServlet?

Yes. The JnlpDownloadServlet distributed in the samples directory of the JDK now supports Pack200. If you deploy yourfile.jar along with yourfile.jar.pack.gz the packed file will exist downloaded when the client is running Coffee Web Outset 1.five.0 or after.
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What is the best manner to ensure only ane instance of my application is run?

Use the SingleInstanceService to register every bit a singleton equally before long as your application starts up. Re-invoking your awarding before it is registered as a singleton will cause another Coffee VM to start upwardly.

Brand sure to unregister before your plan exits.
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When volition properties ready in the jnlp file get set?

Normally, backdrop in the jnlp file will non be set until the kickoff resource listed in that jnlp file is loaded. This insures the backdrop are set earlier any of your code is run, however some properties need to be set before other packages are loaded. Some backdrop are considered to exist "secure" by Java Web Beginning, and, when found in the master jnlp file, will be passed as arguments to the invoking VM (-Dname=value).

The list of "secure" backdrop for this version can be found in the Programmer'southward Guide
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What causes the file not found message for the downloaded jnlp file?

You click on a jnlp file, and Net Explorer downloads the file, then launches Java Web Start, simply you lot get the bulletin: "Could not load file/URL specified: C:\Documents and Settings\...\application[1].jnlp".

This problem is specific to Internet Explorer. Although this can exist acquired by a full cache, or turning off the cache in IE, it is unremarkably caused by a no-enshroud directive coming from either the web server or the proxy server. IE will honor this directive, and non write the jnlp file to disk, then Java Web Start cannot find information technology. This frequently happens when upgrading a tomcat based server. Later on versions prepare the no-cache directive by default for any resource that is within a security-constraint in spider web.xml. Attempt taking the relevant URI out of the security constraint in web.xml.
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How tin can I use signed jars (such as JCE extensions) signed for other purposes?

Beginning with Coffee Web Start 1.5.0, y'all tin can multiply sign the jar, adding code signing certificates over another existing certificate chain. With previous versions, you would either have to run the jar every bit a component extension west/o all-permissions, or strip the existing certificates before adding code signing certificates. (which in many cases rendered the packet inoperable.)
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Why can't I use the Association characteristic on some linux platforms with Gnome?

The association feature specifically requires libgnomevsf-2.so. If this library is not present, associations are not supported.
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How do I ready my server to circulate the jnlp mime blazon?

Each web server has a specific way in which to add MIME types. For example, for the Apache web server you lot must add the following line to the .mime.types configuration file:

application/ten-coffee-jnlp-file JNLP

Check the documentation for the specifics of your spider web server.
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How practise I set my server to utilize the JnlpDownloadServlet?

Run into the Developers Guide department on using the servlet. The application demand not be packaged in a Web Archive.
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How are Applications uniquely identified?

An application is normally identified by it's href (the url to information technology's jnlp file.) If there is no href to the jnlp file, it is identified by the href to it'due south master jar file. If multiple applications share the same main jar file, they must comprise an href, or they will be treated every bit the aforementioned app.

In version 1.5.0 and beyond, the Java Application Cache Viewer, will show all applications, even those w/o an href. The Viewer can simply launch an application online, if it has an href. Without an href, it can launch offline if the jnlp file allows (contains <offline-allowed>)

In previous versions, the Awarding Managing director will only show those applications with an href.

The same thing applies to creating shortcuts. In one.v.0 yous tin only create a shortcut to launch online if there is an href, and can just create an offline shortcut if <offline-allowed> is specified. In 1.4.2, you tin only create shortcuts to applications with an href.
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How exercise I create multiple file-extension/mime-type associations with a JNLP application?

When creating multiple file-extension/mime-blazon associations with your JNLP application, it's recommended that you use multiple clan tags. Also, both the file-extension and mime-type must be specified for each association tag. For case:

            <association extensions="aaa" mime-type="x-awarding/aaa"/>     <association extensions="bbb" mime-type="x-application/bbb"/>          

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Why does FindClass() sometimes fail when called from native lawmaking?

When jni code that may be called on the EventDispatch Thread calls findClass() then it may fail. For more information, see JNI documentation.

Security Questions

How secure is Java Web Offset?

Security is a fundamental consideration of the Java Web First design.  In Java Web Start all applications are launched past default in a secure "sandbox."
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What is a secure sandbox?

Applications in the secure sandbox take restricted access to local computing resources such as the disk and network.
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How is the Coffee Web Start secure sandbox more flexible than the applet sandbox?

All applications, by default, are run in a sandboxed environment, similar to the applet sandbox. Even so, Java Web Commencement provides a secure API that enables an application to import and consign files from the local disk under the user's control. The API includes dialog boxes for operations such as saving a file and opening a file that are really rendered by Java Spider web Start, and not past the application itself.

This sandbox design is similar to what you can do with HTML. A file input field in an HTML form enables a user to pick a file from the local disk and submit the proper noun (excluding path) and content  to the spider web server. Similarly, about browsers support the 'Salvage as...' option.
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How can I enable my application to proceeds unrestricted admission to the organization?

An application requesting unrestricted system admission must be digitally signed. The first time a user launches such an awarding, a security dialog box will appear. Earlier running the application, Coffee Web Offset will prompt the user to have the digital document. After the user has accepted the certificate, subsequent invocations will not bear witness the security dialog box.
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Is there support for encrypted download of JAR files?

Support for encrypting data transferred from the server to the client is very important. This is an important point on our issue list, and we will definitely make sure that HTTPS libraries will work with applications that are launched with Java Web Start. The HTTPS back up might be in an optional package that you need to specify that your application depends on.

Encrypting the JAR files transferred from the server to the customer may not be necessary. The reason is, even if the class files where encrypted on the wire, they will have to be decrypted on the client side and stored to disk, so the JVM will exist able to load the classes. Thus, it could be fairly simple for a cracker to become around the encryption of the JAR files.

Instead, what is important for JAR files is that they tin exist signed, then the user can exist admittedly certain that the application is from the vendor he expect it to be from. This is already supported.
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Can I utilise NTLM hallmark with Java Web Start?

NTLM back up was added to Java i.4.2 on Windows platforms just. You can use NTLM authentication with Java Web Starting time in 1.iv.2 and beyond. The JAuthenticator dialog may contain some misleading text when using NTLM with Java Spider web Start 1.4.two, simply this is fixed in Coffee Web Outset i.5.0.
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Tin can I utilise HTTPS protocol with Java Spider web Start?

HTTPS support was added to Java in version 1.4. You tin use apply HTTPS protocol for Java Web Start resource starting in version 1.2, but may encounter ane of several problems that were addressed in Java Web Outset 1.4.2. It is recommended to utilize at least Java Web Start 1.iv.2 if using HTTPS protocol.
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Are there other online resources to learn more about the security tools?

See the following:

• Signing JAR Files

• Coffee Deployment Guide security affiliate

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Known Bugs

4825415: Web Kickoff desktop integration and security dialogs disappear in 1.4.two

In version i.4.ii merely.

This is the problem where the desktop integration dialog fights for focus with a modal dialog displayed by the awarding, or the dialog is lost backside another application window.

This is stock-still in versions 1.4.2_06 and one.five
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4491398: Dependent DLL resource trouble

In all versions.

If yous have multiple native libraries, you must load each library with Arrangement.LoadLibrary, before loading any other that references it. This may become impossible if libraries have circular dependancies.
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5008460: Spider web Start fails if path contains spaces and TraceSecurity is turned on.

In versions 1.2 and one.four.2

If TraceSecurity is turned on, you may go an exception on Windows platforms if there is a space in the path to the cache directory. If you take this problem plow off the TraceSecurity debugging switch (<property name="javaws.debug.0" proper name="-TraceSecurity" />.

This is fixed in version i.5.
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5074087: If related-content is specified w/o a title on Windows, application cannot first.

In version 1.5.0.

In the specification of the jnlp file, information technology is legal to specify a related-content element without a title sub-chemical element. However if this is done on windows platforms, an exception volition be thrown when the shortcut to the related content is installed, and the programme cannot be run. To work effectually this trouble, always include a title for related-content elements.
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5074524: First jar of unsigned extension must be downloaded eagerly.

In all versions.

If a component extension is used, the first jar in information technology volition be download eagerly, fifty-fifty if information technology is marked lazy.
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5047548: Lazy downloading of parts with packages is broken.

In all versions.

If you use the part and package mechanisms to declare what packages are included in what jar files, you should be able to skip downloading of any lazy jars and so declared, when accessing a non-existent resources not in whatever of the declared packages. This does not work, and without Jar Indexing implemented, in that location is no manner to forestall all jars from being downloaded.
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5074526: ExtenededService file APIs prove security dialog fifty-fifty if app is signed.

In version 1.5.0.

When using the FileOpen Service, the security dialog will only testify if the application does not accept file access permissions. This is not truthful with the new ExtendedService OpenFile, and OpenFiles methods, the security dialog shows anyway.
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4925768: No support for system level shortcuts in Gnome.

In version i.5.0.

When importing applications into the organisation cache with -shortcut, or running the Enshroud Viewer in arrangement mode and creating shortcuts. The shortcuts should be created for all users. This works in Windows, just not on Unix with Gnome.
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5072969: Startup errors causing Web Start to appear to hang.

In all versions.

If an Exception or other Throwable is not caught by Java Spider web Get-go. The main run method may terminate without calling System.exit(). This makes awarding appear to hang (sometimes with DownloadProgress window showing with no progress).

In ane.four.2 this can happen when the Application or Coffee Spider web Start throws an Error (such equally a NoSuchMethodError). Y'all may need to plow on logging to a file and run with <belongings proper name="javaws.debug.0" value="+TraceIgnoredExceptions" /> to encounter the Error.

In i.5.0 this is only known to happen if static code in the applications main class throws an Error (such as a NoSuchMethodError).
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5074530: Web Offset not picking up the right JRE.

In all versions.

When Coffee Spider web Start finds multiple JRE's that satisfy the requirements of the j2se elements version attribute in the jnlp file, it should ever use the latest matching version.

In 1.4.2 it will usually just use the first matching version found.

In one.5.0 it will usually use the latest version, just nether some specific circumstances will still apply an before one.
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Source: https://docs.oracle.com/javase/7/docs/technotes/guides/javaws/developersguide/faq.html

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