HT5559 Oracle has updated java 7 to update 13. Re-enabling java 6 failed
Oracle has updated java 7 to update 13. Re-enabling java 6 cannot be completed with mentioned commands in artikel HR5559. Can anybody help me?
William Lloyd wrote:
You need to run Java 7 at this point, as Java 6 has been disabled due to security risks and there's no current version available that will run on 10.8.
That's not true. If you already have Java SE 6 installed it will run Lion and Mountain Lion. The latest update was provided last Tuesday Java for OS X 2013-001.
The update disables the Java 6 applet plug-in, but does not destroy it. It can be re-enabled using Apple instructions: "Java for OS X 2013-001: How to re-enable the Apple-provided Java SE 6 applet plug-in and Web Start functionality".
@eoever,
The instructions you cited has worked for many others, so I'm not certain why it isn't working for you. Did you previously have Java SE 6 installed and did you update it with 2013-001?
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My Fedora 11 Linux operating system is 64-bit (currently running standard Fedora kernel, NOT Xen pv-ops Dom0 kernel)
My Firefox 4.0 Beta 3 web browser (above Firefox 3.6.8 already) is 32-bit.
My Sun Java 6 Update 21 Plugin is also 32-bit.
In about:plugins in Firefox, I get:
Java(TM) Plug-in 1.6.0_21
File: libnpjp2.so
Version:
The next generation Java <http://java.sun.com> plug-in for Mozilla
browsers.
MIME Type Description Suffixes
application/x-java-vm Java^(TM) Plug-in
application/x-java-applet Java^(TM) Plug-in Applet
application/x-java-applet;version=1.1 Java^(TM) Plug-in
application/x-java-applet;version=1.1.1 Java^(TM) Plug-in
application/x-java-applet;version=1.1.2 Java^(TM) Plug-in
application/x-java-applet;version=1.1.3 Java^(TM) Plug-in
application/x-java-applet;version=1.2 Java^(TM) Plug-in
application/x-java-applet;version=1.2.1 Java^(TM) Plug-in
application/x-java-applet;version=1.2.2 Java^(TM) Plug-in
application/x-java-applet;version=1.3 Java^(TM) Plug-in
application/x-java-applet;version=1.3.1 Java^(TM) Plug-in
application/x-java-applet;version=1.4 Java^(TM) Plug-in
application/x-java-applet;version=1.4.1 Java^(TM) Plug-in
application/x-java-applet;version=1.4.2 Java^(TM) Plug-in
application/x-java-applet;version=1.5 Java^(TM) Plug-in
application/x-java-applet;version=1.6 Java^(TM) Plug-in
application/x-java-applet;jpi-version=1.6.0_21 Java^(TM) Plug-in
application/x-java-bean Java^(TM) Plug-in JavaBeans
application/x-java-bean;version=1.1 Java^(TM) Plug-in
application/x-java-bean;version=1.1.1 Java^(TM) Plug-in
application/x-java-bean;version=1.1.2 Java^(TM) Plug-in
application/x-java-bean;version=1.1.3 Java^(TM) Plug-in
application/x-java-bean;version=1.2 Java^(TM) Plug-in
application/x-java-bean;version=1.2.1 Java^(TM) Plug-in
application/x-java-bean;version=1.2.2 Java^(TM) Plug-in
application/x-java-bean;version=1.3 Java^(TM) Plug-in
application/x-java-bean;version=1.3.1 Java^(TM) Plug-in
application/x-java-bean;version=1.4 Java^(TM) Plug-in
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application/x-java-bean;version=1.6 Java^(TM) Plug-in
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Java Plug-in 1.6.0_21
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c: clear console window
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g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
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q: hide console
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s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
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at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at
sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown
Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.UnknownHostException: www.java.com
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at
sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown
Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 9 more
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What's going on? And what's wrong?
Yours sincerely,
Mr. Teo En Ming (Zhang Enming)
Citizenship: Singapore Citizen/Singaporean
Facebook account:http://www.facebook.com/profile.php?id=100000750083982
Location: Bedok Reservoir Road, Singapore 470103
My Open Letter (Plea for Medical Help/Assistance) to World Leaders:
http://lists.fedoraproject.org/pipermail/users/2010-August/380213.htmlThere's nothing about Java connection settings and Java Control Panel in the link you have supplied.
http://java.sun.com/javase/6/webnotes/install/jcp.html -
I tried activating the plugin at osgov.com/webcam.html to see the web cam. I keep getting an error message that the plug in failed when i try to activate it when I am on firefox.
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Java 7.11 is vulnerable, so use it, it if absolutely necessary.
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Java 7 Update 25 Client App Downloaded From Web Start Can't Connect Out
Since Java 7 update 25, I have an issue where my client Java application, downloaded with Java Web Start, can no longer connect to a remote server. (The client uses remote EJB to connect various servers). The issue I believe is that the client application is being blocked by security features of this Java update.
A very quick (random?) fix around the problem is to show the Java console. If the Java console is enabled to be shown, the client application can connect fine.
Although showing the Java console is a quick fix, it's not one we particularly want to keep asking customers to do. I understand we may need to define the Codebase and Permissions in the manifest file as described here: http://docs.oracle.com/javase/7/docs/technotes/guides/jweb/no_redeploy.html..
I have defined the Codebase and Permissions in the manifest of the client jar's we build ourselves. I believe this has worked as we no longer see "Missing Codebase manifest attribute for...." in the console for our own jar's. However, the application still cannot connect out. I'm stumbling around somewhat on this issue and trying various things in an attempt to get this to work. Assuming i'm on the right lines and the problem is some jars missing the Codebase and Permissions in their manifests, my question is, should I and how can I modify the manifest of 3rd party jars to include this information? For example, the client app requires many JBoss and EJB client jars - do I need to somehow modify the manifest of all of these jars to include the codebase and permissions?
It goes without saying that all the jars are signed - the application would not start at all if there was a problem here. So the application starts with it's login box - but it simply cannot connect out to the servers.
If anybody can offer any help on this issue i'd be most grateful. As a quick fix, is there a way to get this to work via adjusting Control Panel settings (other than showing the console)? I have played with a lot but not stumbled on a way to get this to work other than showing the console, although ideally i'd like to be able to get this to work without having to do any tweaks to clients Java control panel.We're also seeing this. The 7u25 update completely derailed a trial program we were conducting, because no one could log in to our application via WebStart once they upgraded Java.
Our login code crashes because SwingUtilities.isEventDispatchThread() throws an NPE.
We tried theskad81's fix but it didn't work for us. We worked around the issue by hosting u21 on our site and pointing our WebStart page there instead of at Oracle's update site.
*** ORACLE: PLEASE FIX THIS ISSUE USING APPLE'S FIX (mentioned in an earlier post - see above) ***
Slightly edited stack trace:
javax.security.auth.login.LoginException: java.lang.NullPointerException
at sun.awt.SunToolkit.getSystemEventQueueImplPP(Unknown Source)
at sun.awt.SunToolkit.getSystemEventQueueImplPP(Unknown Source)
at sun.awt.SunToolkit.getSystemEventQueueImpl(Unknown Source)
at java.awt.Toolkit.getEventQueue(Unknown Source)
at java.awt.EventQueue.isDispatchThread(Unknown Source)
at javax.swing.SwingUtilities.isEventDispatchThread(Unknown Source)
at com.abc.ConsoleAuthUI.handle(ConsoleAuthUI.java:43)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
at com.sun.proxy.$Proxy1.handle(Unknown Source)
at com.abc.ms.rmi.MsLogin$1.handle(MsLogin.java:100)
at javax.security.auth.login.LoginContext$SecureCallbackHandler$1.run(Unknown Source)
at javax.security.auth.login.LoginContext$SecureCallbackHandler$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext$SecureCallbackHandler.handle(Unknown Source)
at com.abc.ms.auth.abcLoginModule.login(abcLoginModule.java:35)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at javax.security.auth.login.LoginContext.invoke(Unknown Source)
at javax.security.auth.login.LoginContext.access$000(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(Unknown Source)
at javax.security.auth.login.LoginContext.login(Unknown Source)
at com.abc.ms.rmi.MsLogin.authenticate(MsLogin.java:111)
at com.abc.ms.rmi.MsLogin.login(MsLogin.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at javax.security.auth.login.LoginContext.invoke(Unknown Source)
at javax.security.auth.login.LoginContext.access$000(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at javax.security.auth.login.LoginContext$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(Unknown Source)
at javax.security.auth.login.LoginContext.login(Unknown Source)
at com.abc.ms.rmi.MsLogin.authenticate(MsLogin.java:111)
at com.abc.ms.rmi.MsLogin.login(MsLogin.java:92)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
at com.sun.proxy.$Proxy0.login(Unknown Source)
at com.abc.abc.ui.console.Main.attemptLogin(Main.java:488)
at com.abc.abc.ui.console.LoginDialog$7.run(LoginDialog.java:182)
at com.abc.util.GrayTimer$GrayTimerTaskWrapper.run(GrayTimer.java:84)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source) -
Java 7 update 11 can not be stored in the computer (10.8.2.) Why?
Java 7 update 11 has trouble. It does jump over installing place, and are not stored even if it says its completed. Help..
I've installed the latest version of Java [EDIT: latest as of a week ago] directly from Oracle's website. I just checked and Java applets residing on my computer work as expected.
Easiest way to determine if Java is installed is to check System Preferences, because this is where J7v11+ preferences are found now (a change from Oracle).
There is a process within the Safari browser where Apple can impose minimum versions of plugins. Recently such an imposition was made, that effectively disables Java in the browser. This is equivalent to unchecking the Java checkbox in Safari preferences. You can also disable Java in the browser for all browsers via the Java Preferences in System Preferences.
What Apple did was to limit the allowable version of Java in Safari to a version that does not exist (ie a newer version number than the latest version from Oracle). As mentioned, this effectively disables Java in Safari.
However, you should be able to use an alternate browser (eg Firefox) and enable Java in the browser via the Oracle Java preference pane found in System Preferences (and double check with Firefox's preferences).
This assumes you've properly installed the latest version of Java from Oracle directly. In this case, Java should work in Firefox but not in Safari, and Java apps residing on your hard drive should work as normal (unless they're incompatible with the latest version of Java from Oracle).
Now, on my system, Java from Oracle was installed prior to the latest effort by Apple to disable Java in Safari. So, although I don't see a reason why it should be any different, it's possible that someone trying to download Java from Oracle might not be able to fully install it.
In order to determine if that's the case, I suggest users look for the Java Preference Pane in System Preferences to see if it was sucessfully installed.
UPDATE: I am currently downloading j7v13 via the Control Panel. All seems fine. It may well be that v12 was skipped because that was the version imposed by Apple for a "legal" plugin for Safari. Either way the latest version of Java (and Flash) should always be installed since those two are prime vectors for attack on most computers via the browser. -
Java 7 update 13....good or no good?
I've read that Oracle has introduced Java 7 update 13. This version has 50 security issues that have been addressed. My question is; Should I download this latest version and then enable it in Safari preferences?
I installed it a few days back when I was forced to by Safari. Today I was accessing a JPL NASA website for Near Earth Obects and Java 7 update 13 has continually crashed Safari. So, I would give an emphatic NO.
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After installing Java 6 update 11, unable to open .jnlp files.
Appears to download application then quits without an error message. When clicking on the .jnlp file again, nothing happens. I can go into java preferences and remove the application from the cache, but it does the same thing, redownloads the application then doesn't open it.
Java is notoriously responsible for many vulnerabilities, if you must run it then these are the instructions:
Turning on Java
Why will Applets not run after getting Java through Apple Software Update?
Apple disables the Java plug-in and Webstart applications when the Java update is done using Software Update. Also, if the Java plug-in detects that no applets have been run for an extended period of time it will again disable the Java plug-in.
To enable the Java plug-in
Go to Finder > Applications > Utilities > Java Preferences.
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Installing and updating Java
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I DO have Mac version 10.7.3 (Lion) or higher.
Users of Lion Mac OS X 10.7.1 and 10.7.2 should upgrade to 10.7.3 or later versions via Software Update, so you can get the latest Java 7 version from Oracle.
Download page here:
https://www.java.com/en/download/manual.jsp#mac
Why is Java 7 available only for Mac OS X 10.7.3 and above?
The Java Runtime depends on the availability of an Application programming interface (API). Some of the API were added in Mac OS X 10.7.3. Apple has no plans to make those API available on older versions of the Mac OS.
Further Hardening your Mac against web based Java attacks
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Java 7 Update 10 Not Working with Firefox?
Windows 7 64-bit
Mozilla Firefox 17.0.1 (Latest as of this time of writing)
Java 7 Update 10 (Runtime Edition)
Java 7 Update 10 (Runtime Edition) 64-bit
It used to work before I updated it to the latest version of Java.
I tried reinstalling everything with a clean registry but none has worked.
The problem is that "Java(TM) Platform" is missing from the plug-in list. When I run Java content in my Firefox it gives an error saying "Missing content...".
Works perfectly with Internet Explorer and the 64-bit version.
Any thoughts on how to make this new update work with Firefox?The problem is, that some registry kexy are missing.
These keys here works for JRE (32 bit) on Win 7 (64 bit), installed in the standard path.
Just add them after the installation of the JRE 7u10 and the Firefox plugin will work.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2]
"Description"="Oracle® Next Generation Java™ Plug-In"
"GeckoVersion"="1.9"
"Path"="C:\\Program Files (x86)\\Java\\jre7\\bin\\plugin2\\npjp2.dll"
"ProductName"="Oracle® Java™ Plug-In"
"Vendor"="Oracle Corp."
"Version"="10.10.2"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes]
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;jpi-version=10.10.2]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.1]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.1.1]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.1.2]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.1.3]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.2]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.2.1]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.3]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.3.1]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.4]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.4.1]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.4.2]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.5]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.6]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-applet;version=1.7]
"Description"="Java™ Applet"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-vm]
"Description"="Java™ Virtual Machine"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\MozillaPlugins\@java.com/JavaPlugin,version=10.10.2\MimeTypes\application/x-java-vm-npruntime]
"Description"="Java™ Applet" -
Trigger java client update when table changes
I have a Java Swing client and a C worker program. Both need to communicate with each other via events (C writes progress to Oracle table, Java Swing client displays progress to user).
I thought I'd do this via a trigger on an oracle table. However, I couldn't figure out how to achieve that. Well, creating the trigger was the easy part, but how do I let the trigger and as a follow-up a stored procedure communicate with my Java client? All the info I found was about triggers and how to store a Java method in an Oracle DB. That's not what I need. I guess I need to register my Java client somehow to monitor the trigger / table.
Does anyone know how to do that? I'd prefer to not use any additional libraries (Oracle AQ libraries, Oracle streams). A simple trigger would suffice.
Thank you very much for your help!rp0428 wrote:
>
The client should poll for updates.
Pushing from the database, which your original suggestion and the others provides no benefit in terms of the enterprise and might cause unforseen and difficult to diagnose problems.
>
I don't agree with either of these comments. Please explain them and provide any supporting documentation or other reliabe sources that you are basing these comments on.
In particular clarify whether your comments are about the technology of notification in general or whether you feel that the notification solution is not appropriate for this particular use case.
Polling is generally a terribly wasteful, inefficient and non-productive method of trying to identify changes that happen in a database. Provide supporting documentation for that.
Naturally the actual metrics for this depend on the number, types and frequency of the DB changes in general and with their relation to the polling frequency in particular.Yep. And most of the time the specifics for that is such that one or both the following is true
1. The requirements are wrong (for example no GUI needs to be update 100 times a second.)
2. The requirements are loose enough that polling is perfectly adquate and appropriate solution.
Oracle itself has gone in the opposite direction with the technology that it develops as can be inferred by the various methods provided in recent releases to support replication and the technology underlying the support of fast refresh materialized views.
Oracle has all sorts of stuff in it. That doesn't mean that it ideal for all situations or even most situations.
These technologies include Advanced Queuing, Change Data Capture, Advanced Replication, Standby Databases and the like.
The only major Oracle technology that I am aware of that does not tend towards publish/subscribe is LogMiner and it does not use polling but rather uses a batch query process.
And yet for 20 years people have managed to implement large solutions without that.
Detection of DB changes is difficult for even small single tables without using functionality provided by Oracle specifically for that purpose. There are many, many references in these forums and on the web in general where developers have attempted to 'roll-their-own' procedures for detecting changes after the fact. Most of these attempts are flawed both in their design and execution.
And yet you think that this new technology will provide immediate error free solutions both on Oracles sides and the implementors side?
Polling is generally wasteful and inefficient for several reasons. First, poll queries can execute repeatedly when there haven't been any changes at all. This effort is entirely wasted and non-productive.
I have a large volume database server whose cpu utilization is less than 3% with a projected volume this year of 3/4 billion dollars. In the mid 1980s I was more concerned with utilization. Not so much any more.
On the other hand experience would suggest that developers have far, far more problems getting the database designs right in the first place. So I don't have great confidence in their ability to use brand new technologies to solve large volume problems.
And if they don't have large volumes then the point is moot.
The poll queries cannot easily determine exactly when the change occured; change meaning it was COMMITTED to the database. The common approach of updating columns such as MODIFIED_DATE within a trigger are flawed because any such date/time assigned in the trigger is virtually guaranteed to occur BEFORE the data is actually committed.
The classic flaw manifests itself when the trigger assigns a value before midnight but the commit actually occurs after midnight. Thus two INSERT/UPDATES can have their data COMMITTED at exactly the same SCN and timestamp value but the MODIFIED_DATE values can be for two different days.
There is no way to query this data on a nightly basis to get 'changes that happened today' with the risk of missing data the next night when the extract occurs, or worse, duplicating some data in the extracts for two different nights.
I agree that the design you specified is flawed.
It however is an excellent demonstration of how a developer might create a flawed design - as I a suggested. New technologies do not fix flawed designs. All they do is provide even more ways to create flawed designs. Which is exacerbated by large volume needs.
And 'pushing from the database'? The change notification process is similar to publish/subscribe mechanisms and also similar to the way that listeners are used in Java.
Certainly you wouldn't suggest that Java applications should 'poll' GUI objects to see if a user has taken any action would you?
I agree your analogy is not apt for this discussion.
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