Setting java.ext.dirs property at start-up vs. runtime

I've been trying to invoke an input method (based on Java IMF). I'd like to place a lang_im.jar file, packaged as installed extensions, at an arbitrary directory, say, C:/foo, other than lib/ext to bypass system security/privilege issues that prevent one from copying lang_im.jar into lib/ext. I found that setting "java.ext.dirs" system property at start-up time, e.g.,java -Djava.ext.dirs=C:/foo -jar myprogram.jarallowed me to activate the input method, but setting it at runtime by placingSystem.setProperty("java.ext.dirs", "C:/foo");at the top of main() changed the extension directory but did not load the installed extension at the specified directory. Apparently, the extension mechanism behavior varies in the cases of before and after classloading, I guess.
How can I make it so that setting the property at runtime will work the same as at start-up? Thanks.
Quan

Can anyone help?

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Changing java.ext.dirs property

Hi,
I am having trouble with the system property java.ext.dirs. I want to change its location. The name suggests (dirs) that it will accept multiple directories. The reason I want multiple directories is to be able to use the jars in the default location as well. But it doesn't work and gives the following error:
java.lang.NoClassDefFoundError: somepath/some_application
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(Unknown Source)
     at java.security.SecureClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.defineClass(Unknown Source)
     at java.net.URLClassLoader.access$100(Unknown Source)
     at java.net.URLClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClassInternal(Unknown Source)
     at java.lang.Class.getDeclaredConstructors0(Native Method)
     at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
     at java.lang.Class.getConstructor0(Unknown Source)
     at java.lang.Class.newInstance0(Unknown Source)
     at java.lang.Class.newInstance(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Is there any way I could add another directory instead of replacing the default one.
Also, I have to manually create a directory if I want lib/ext to point at another location. Is there any way to tell jre to create the directory if it doesn't already exist.
Thanks.
-jas

Hi There,
Linux Red Hat 5 EL
JVM 1.5
Anyone knows of an optional to define environment variable to override / append to the ext path? I'm asking because I have an installation that include a whole bundle of 3rd party jar's. I would like to have this available to all components of the system without me having to add the "-D" flag to each JVM launched.
I already have a script that defines JAVA_HOME and alike on system startup using /etc/profile.d and I would like to add to that my custom ext definition, something like export JAVA_EXT_PATH="/opt/MyProduct/java-ext"
Reference article : http://today.java.net/pub/a/today/2005/04/26/extending.html
Thank you,
Maxim.
// I know this is a historical post, but perhaps some one found a solution

Does java.ext.dirs have any influence on the heap XMX setting?

Hello,
I've been using a XMX setting of 3800M for a particular JVM running a particular task.
However, if I pass the -Djava.ext.dirs option, and point it to some directories, the JVM fails for the same task I've been running in my first run.
truss output appears to show the failure occurring during mmap() resulting in ENOMEM.
The question is, under what condition would java.ext.dirs change the behavior of my XMX setting? If it take it out, it runs fine.
Java version: 1.4.1, SunOS Sparc

If it causes things to be loaded that wouldn't otherwise be loaded.
I assume the fairure you're getting is related to memory? you didn't say.

The impact of java.ext.dirs and XMX settings to a JVM

Hello,
I've been using a XMX setting of 3800M for a particular JVM running a particular task.
However, if I pass the -Djava.ext.dirs option, and point it to some directories, the JVM fails for the same task I've been running in my first run.
truss output appears to show the failure occurring during mmap() resulting in ENOMEM.
The question is, under what condition would java.ext.dirs change the behavior of my XMX setting? If it take it out, it runs fine.
Java version: 1.4.1, SunOS Sparc

This sounds like a problem I had a while ago that stumped me for several days.
If your class with the "main" method is loaded from the extensions directory (java.ext.dirs), it appears that a special classloader is used to do that, not the standard classloader that looks in the classpath. This special classloader appears to ignore the classpath and look only in the extensions directory. Also, the JVM appears to try this classloader before the standard classloader.
Now, when one class wants to load another class, it always uses the classloader that loaded it to load that other class (unless you specifically write your program to use some other classloader). So what is happening to you is this: The "extensions classloader" loads your class with the "main" method, because it can. Then your "main" method tries to load another class, but it uses the "extensions classloader" to do that. And the "extensions classloader" doesn't look in the classpath, and what you saw is what you got.
At least the answer to your problem is clear: Don't do that.

Setting java.library.path property in java code

Hi,
i'd like to set java.library.path property in java code to load a dll-library. I know that a funtional way is to run JVM with parameter -Djava.library.path=c:\tmp, but I need it do it IN CODE.
I'v tried this:
System.setProperty("java.library.path", "c:\\tmp");
System.loadLibrary("libapr");The library 'libapr.dll' is situated really in 'c:\tmp' directory, but I get 'java.lang.UnsatisfiedLinkError: no libapr in java.library.path' exception.
It seems like the already running java program doesn't use actual java.library.path set in previous step.
Is there any possibility to set java.library.path property in java code?
Thanx
Brny

I think the following code should work:
// Reset the "sys_paths" field of the ClassLoader to null.
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          field.set(clazz, null);
          try {
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               System.setProperty("java.library.path", "c:\\tmp");
               System.loadLibrary("libapr");
          finally {
               //Revert back the changes.
               field.set(clazz, original);
               field.setAccessible(accessible);
The idea is to make the static field "sys_paths" null so that it would construct the paths from the changed value.

How to set "Maximum Lenght" column property for database block at RUNTIME?

Hi folks,
Is it possible to somehow set a "Maximum Length" property for database block column at runtime?
I have a dynamic form, which maintains mostly "STATIC DATA" within all application which are stored in different static data tables (which have similar structure). But now, description column in some of those tables was extended (not in all at this stage). I would like to avoid truncating form error while reading data from those extended tables, so I would like to set an MAXIMUM SIZE to accurate value at the time when I'm specifying TABLE NAME for that database block.
What property should I use to set it?
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Thanks,
Tomas

Hi Magoo, thanks for reply.
Yes, but then user can get other errors while trying to set description with value longer than in database (for all not extended tables).
Aby idea how to implement SET_CUSTOM_PROPERTY like mentioned here?
Oracle Forms - "maximum length" property.
Thanks,
Tomas

-Djava.ext.dirs

Hello,
I'm trying to get some Java code that used to run on 1.4 to run using the 1.5 JDK now. In the batch file that starts the program the -Djava.ext.dirs command is used.
-Djava.ext.dirs=%JAVA_HOME%\lib
There are a few other directories on the list of jars that are specific to the program. The problem is in 1.5 this seems to grab more then just jars. The 1.5 JDK had .idl files in the lib directory along with the jar files now and the -Djava.ext.dirs includes teh .idl files into the classpath.
Durring run time it tries to unzip the files in the classpath and starts throwing errors when it can't unzip the .idl files.
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Also can I some how tell the java.ext.dirs to only get jar files otherwise I might have to add all 30+ jar files to the classpath individually because the command keeps picking up small things like CVS tracker files.
Anyone have a clean solution to this problem?
Thanks.

I'm pretty new to Java but isn't ant for compiling
your files... not sure how I could use ant to run a
class...Yes, that's correct.
>
Sorry about not being really clear about this but my
batch file uses the java <class> to start up a web
server which will later on invoke jsp pages which
requires using the javac compiler so I'm not exactly
sure how ant would fit in. The code I wrote is
compiled into classes and ziped into a jar already.If this is a Web app, you should have those JARs in the WEB-INF/lib directory for your Web app.
%

Getting the runtime environment to see packages in the jre/lib/ext dir

I've downloaded mysql-connector-java-3.0.6-stable-bin.jar so that i can connect to a mysql database. I can use it fine from tomcat, but when I try and write stand alone stuff I get
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:198)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:140)
at WebUtils.DatabaseConnection.Query(DatabaseConnection.java:27)
at AddToDatabase.main(AddToDatabase.java:13)
I suspect it could be a classpath related error but I have no idea how to fix it, or even how to set the classpath or view it's current value.
Any ideas,
Pete

I've downloaded
mysql-connector-java-3.0.6-stable-bin.jar ...Can we assume you've put it on the JDK/jre/lib/ext dir ?
I suspect it could be a classpath related error but I
have no idea how to fix it, or even how to set the
classpath or view it's current value.Which OS are you using ?
Rafael

How to Set "file.encoding" System Property to default "UTF-8"

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If i run my jar using command java -Dfile.encoding=UTF-8 -jar myprog.jar . It is working and my special characters are also looking in right way.
Can i set this defalut encoding by programming approach.
Thanks
Ashish Pancholi

Hello,
I have the same problem. I have a java prog that is started with "-Dfile.encoding=ISO-8859-1". Now in this program I want to print some characters using the UTF-8 encoding because I know that the terminal I will be printing on has this encoding. I tried using InputStramReader without success:
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        System.out.println(line);
    }EDIT:
the above example is to read something into my java program. If I want to write something from my java class to an output it goes like this:
Writer out = new BufferedWriter(new OutputStreamWriter(System.out, "UTF8"));
out.write("Müller\n");
out.flush();... in that case I get the correct encoding.
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T

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Are there any other installations that you might have done recently? Please make sure the environment parameter/variable is set to the right path with no spaces.
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Problem setting a provider specific property : JMS adapter

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I need to set a provider specific property as required by the third party in a IDoc to JMS scenario.
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JMS_XXX
and then using the DynamicConfigurationBean I assign a value to this in the reciever channel.
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Is it possible to set such a provider specific property using XI or not?

Hi Amol,
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JMS Message Delivery Mode               DCJMSDeliveryMode
JMS Message Destination                   DCJMSDestination
JMS Message Expiration                     DCJMSExpiration
JMS Message ID                                DCJMSMessageID
JMS Message Priority                         DCJMSPriority
JMS Message Redelivered Flag            DCJMSRedelivered
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JMS Message Type                              DCJMSType
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Hi vikram ,
i hvnt initialized the properties ,
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i added two attributes ( java.lang.Boolean ) say disablr_btn ,*visible_btn* and mapped wth the Save button Properties Disabled and Visible using expressions
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How to add path to "java.library.path" property?

I use this command to set the "java.library.path" property:
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Have you tried
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in response to lllaass
here what I copied from Console:
27/12/2014 02:29:58,457 WindowServer[185]: WSGetSurfaceInWindow : Invalid surface 1336265605 for window 268
27/12/2014 02:30:02,516 WindowServer[185]: WSBindSurface : Invalid surface 1040636110 for window 266
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27/12/2014 02:30:17,371 com.apple.xpc.launchd[1]: assertion failed: 14B25: launchd + 160118 [55B9FF23-B298-321A-B776-CF7676586C04]: 0xe
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Call location:
27/12/2014 02:30:18,819 Office365Service[2012]: 0   CarbonCore                          0x901777e7 ___Gestalt_SystemVersion_block_invoke + 135
27/12/2014 02:30:18,819 Office365Service[2012]: 1   libdispatch.dylib                   0x960dc130 _dispatch_client_callout + 50
27/12/2014 02:30:18,819 Office365Service[2012]: 2   libdispatch.dylib                   0x960dc0b5 dispatch_once_f + 251
27/12/2014 02:30:18,819 Office365Service[2012]: 3   libdispatch.dylib                   0x960dd0d8 dispatch_once + 31
27/12/2014 02:30:18,819 Office365Service[2012]: 4   CarbonCore                          0x90109fb8 _Gestalt_SystemVersion + 1050
27/12/2014 02:30:18,819 Office365Service[2012]: 5   CarbonCore                          0x90109b69 Gestalt + 150
27/12/2014 02:30:18,819 Office365Service[2012]: 6   Office365Service                    0x000589a3 Office365Service + 358819
27/12/2014 02:30:29,794 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,794 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,797 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,799 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:29,801 warmd[36]: [_bootcachectl_playlist_for_file:3197] Unable to generate playlist for file: 2 No such file or directory
27/12/2014 02:30:30,870 xscertd-helper[2020]: ldap_search_ext_s returned -1 - Can't contact LDAP server when searching for bdb suffix, exiting
27/12/2014 02:30:30,883 com.apple.xpc.launchd[1]: (com.apple.xscertadmin[2020]) Service exited with abnormal code: 1
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.927642 AM [AirPlay] Power: SystemWillSleep
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.927798 AM [AirPlay] BTLE client stopping to browse for AirPlay Solo Target Presence.
27/12/2014 02:30:30,928 coreaudiod[1249]: 2014-12-27 02:30:30.928007 AM [AirPlay] BTLE discovery removing all devices
27/12/2014 02:30:30,929 coreaudiod[1249]: 2014-12-27 02:30:30.929458 AM [AirPlay] BTLE client stopped to browse for AirPlay Solo Target Presence.
27/12/2014 02:30:30,931 watchdogd[162]: [watchdog_daemon] @(         pm_callback) - ref=0x0 msg_type=0xe0000280 msg=0x2a0005
27/12/2014 02:30:30,931 watchdogd[162]: [watchdog_daemon] @(    wd_daemon_thread) - events buffer: 65r1069 3634s1069
27/12/2014 02:30:30,965 Office365Service[2012]: System shutdown notification
27/12/2014 02:30:31,001 WindowServer[185]: device_generate_desktop_screenshot: authw 0x0(0), shield 0x7fbf43423ed0(2001)
27/12/2014 02:30:31,044 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>: notification observer: com.apple.iChat   notification: __CFNotification 0x7ffac2d4efa0 {name = _NSDoNotDisturbEnabledNotification}
27/12/2014 02:30:31,044 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>: notification observer: com.apple.FaceTime   notification: __CFNotification 0x7fde8a54a860 {name = _NSDoNotDisturbEnabledNotification}
27/12/2014 02:30:31,089 WindowServer[185]: device_generate_lock_screen_screenshot: authw 0x0(0)[inf, inf, 0, 0] shield 0x7fbf43423ed0(2001), dev [1680,1050]
27/12/2014 02:30:31,000 kernel[0]: PM response took 168 ms (1194, UserEventAgent)
27/12/2014 02:30:31,105 WindowServer[185]: device_generate_desktop_screenshot: authw 0x0(0), shield 0x7fbf43423ed0(2001)
27/12/2014 02:30:31,180 apsd[59]: Peer [pid=1203] requested push wake but lacks APSPushWakeEntitlement
27/12/2014 02:30:31,228 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>:    NC Disabled: NO
27/12/2014 02:30:31,228 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>:    NC Disabled: NO
27/12/2014 02:30:31,237 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>:   DND Enabled: YES
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>:   DND Enabled: YES
27/12/2014 02:30:31,237 imagent[1305]: <IMMacNotificationCenterManager: 0x7fde8a42c1e0>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2c4fef0>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,237 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>: notification observer: com.apple.iChat   notification: __CFNotification 0x7ffac2c43f40 {name = _NSDoNotDisturbEnabledNotification}
27/12/2014 02:30:31,244 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>:    NC Disabled: NO
27/12/2014 02:30:31,249 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>:   DND Enabled: YES
27/12/2014 02:30:31,249 identityservicesd[1311]: <IMMacNotificationCenterManager: 0x7ffac2e30040>: Updating enabled: NO   (Topics: (null))
27/12/2014 02:30:31,000 kernel[0]: PM response took 347 ms (71, blued)
27/12/2014 02:30:49,000 kernel[0]: PM response took 3456 ms (31, powerd)
27/12/2014 02:30:49,000 kernel[0]: Failed to get hibernate image filename
27/12/2014 02:30:49,000 kernel[0]: AirPort_Brcm43xx::powerChange: System Sleep
All that is really chinese for me Do you know where i could get anything to be teached about all that
Thanks

Setting java runtime option through java program

I want to set java runtime options(like -verbose, -ea) through java program instead of setting them through command promt. (Like, I can set -D options through System.setProperty() method). Is there any way out?

I want to set java runtime options(like -verbose,
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Setting java.ext.dirs property at start-up vs. runtime

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