Remote Client Applet -Write File - Cannot be Done

I've concluded that it is not possible for an applet embedded in a web-browser to write to a clients hard-disk no matter what you do with signing, policytool or RSA certificates.
HD

We can write, if the applet or jar file is signed

Similar Messages

Is thr way to applet write file, client machine without entry in policy

hi,
is there any way to allow applet write file in local machine (client ) without entry in policy file... i feel this extra step to clients...
To achieve this what are class i have to implements...

No, thank God there isn't.

How applet write file in local system by URL instead of FileOutputStream()

hi,
how can applet write a file in local system through URL instead of FileOupStream()
plz.....plz.....plz......
URL url = new URL(" file://c:/temp.txt");
in this url how applet can write
plz....

URL uses http to cummunicate, this means you can send and receive data using the http
protocol.
The OS doesn't do anything with this, you need a http server to interpret these messages
and take appropriate action (with server side script or CGI).
So if the client has a http server installed and has server side script thad does
something with your http request (that's what a url does) than it is possible.
Since both having a http server , server side script and or CGI have nothing to do with
signed applets I will not answer your question here.
But the mail reason I won't answer it is because it makes no sence to use a URL to write
to the local file system.

Applet write file on coming server without servlet

Hi, I have an applet that needs to write a new file on the server that's LOADED FROM. Here are my questions:
1) can the applet write this file WITHOUT using a servlet on the server side?
2) if it's possible, could someone send me an example to explain how to do it?
Thanks in advance, have a nice day

1) can the applet write this file WITHOUT using a
servlet on the server side?No,it can't. Well, on the server is not necessary to
have a java servlet but you should have "something"
that can receive your data, understand it and save it.
A small PHP script is enough.
Hope this help

Java applet writes to file on client, no signing necessary

Hi,
I wonder if this is a feature or bug:
I download and execute in my browser an unsigned applet/jar myCharts.jar from server. The applet references classes from package org.jfree.chart, which are not packed in myCharts.jar downloaded from server, but are locally stored on client in jre/lib/ext/jfreechart.jar (and therefore JVM running the applet loads and uses these local classes from local jar).
The applet can write the file to client disk without any problem using classes from locally loaded jfreechart.jar. If I merge both jars into a big one and load it through network, file write access is forbidden.
I am using JRE 1.5.0.3 for Windows and default java_policy file with 2 permissions added:
permission java.lang.RuntimePermission "accessDeclaredMembers";
permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
Is it a bug, or feature ?
According to my opinion these 2 permissions should not result in applet ability to write files using locally loaded classes.
Thanks for your answer
Martin

The following is a duplicate posting in reponse to similar question:
http://forum.java.sun.com/thread.jsp?forum=4&thread=200482&start=0&range=30#735223
In short, you cannot write to a server without help from servier-side software such as a servlet, cgi, ASP, etc.
If you go with something like an Oracle database on your server, it's a non-issue because the seucirty aspects are taken care of for you.
V.V.

I'm trying to download my Master CS6 onto a new hard drive because my old one crashed and I keep getting a message saying " Cannot write the file" or "I don't have permission to access the requested resource." ? What does this mean?

I'm trying to download my Master CS6 onto a new hard drive because my old one crashed and I keep getting a message saying " Cannot write the file" or "I don't have permission to access the requested resource." ? What does this mean?

Yes- it is a Mac. I went through adobes system requirements and re- downloaded supportive software. The notice seems to happen near the end of the down load with the messages above. I'll look into your suggestion. Thank you- appreciated.

When I try to reinstall Photoshop Element 13, I get the message "cannot write file". i own the program and I don't want to subscribe to Creative Cloud. What can I do?

When I try to reinstall Photoshop Element 13, I get the message "cannot write file". i own the program and I don't want to subscribe to Creative Cloud. What can I do?

This has nothing to do with CC or any of that. You have insufficient user privileges to write files locally on your computer or a technical issue gets in teh way. Since you have not provided any system info or otehr details, we cannot tell you more than that.
Mylenium

How to generate graphs from csv file and show on remote clients?

Hi,
I have set of csv files. Each file has 104 parameters. From these parameters different graphs have to be generated and displayed to remote clients thru tomcat.
Can anyone tell me how to do that?
cheers,
its reeju

it's very easy to load the CSV into java objects. Once you have done that why not use the Java2D API to draw your graphs and then use the Sun JPG encoder tools to write out a jpg stream back to the browser (you will need to set the content type for jpg).

Write files on a Server with an Applet

How can I write files (like php) on my server with an applet? Can anybody explain it step for step?

Yes... but then...? I thinked applets have no
permission to write files...The correct sentence is: unsigned applets don't have permission to write files locally. Also, unsigned applets cannot access any other server than the one they came from. You don't seem to do either, so it might work without signing. And if you need sining, just sign it.
What I don't know is how you can use an FTP or any other 3rd party library in combination with an applet... dunno if the user needs to have it locally or whether the applet can pull it off your server if needed.

ASA Remote Access VPN: internal LAN cannot connect to connected VPN clients

Hi community,
I configured IPSec remote Access VPN in ASA, and remote client use Cisco VPN client to connect to the HQ. The VPN is working now, VPN clients can connect to Servers inside and IT's subnet, but from my PC or Servers inside LAN cannot ping or initial a RDP to connected VPN clients. Below is my configuration:
object-group network RemoteVPN_LocalNet
network-object 172.29.168.0 255.255.255.0
network-object 172.29.169.0 255.255.255.0
network-object 172.29.173.0 255.255.255.128
network-object 172.29.172.0 255.255.255.0
access-list Split_Tunnel remark The Corporation network behind ASA
access-list Split_Tunnel extended permit ip object-group RemoteVPN_LocalNet 10.88.61.0 255.255.255.0
ip local pool remotevpnpool 10.88.61.10-10.88.61.15 mask 255.255.255.0
nat (inside,outside) source static Allow_Go_Internet Allow_Go_Internet destination static remotevpnpool remotevpnpool
crypto ipsec ikev1 transform-set myset esp-aes esp-sha-hmac
crypto dynamic-map dyn1 1 set ikev1 transform-set myset
crypto map mymap 65000 ipsec-isakmp dynamic dyn1
crypto map mymap interface outside
tunnel-group remotevpngroup type remote-access
tunnel-group remotevpngroup general-attributes
address-pool remotevpnpool
authentication-server-group MS_LDAP LOCAL
default-group-policy Split_Tunnel_Policy
I don't know what I miss in order to have internal LANs initial connection to connected vpn clients. Please guide me.
Thanks in advanced.

Hi tranminhc,
Step 1: Create an object.
object network vpn_clients
subnet 10.88.61.0 mask 255.255.255.0
Step 2: Create a standard ACL.
access-list my-split standard permit ip object RemoteVPN_LocalNet
Step 3: Remove this line, because I am not sure what "Allow_Go_Internet" included for nat-exemption.
no nat (inside,outside) source static Allow_Go_Internet Allow_Go_Internet destination static remotevpnpool remotevpnpool
Step 4: Create new nat exemption.
nat (inside,outside) source static RemoteVPN_LocalNet RemoteVPN_LocalNet destination static vpn_clients vpn_clients
Step 5: Apply ACL on the tunnel.
group-policy Split_Tunnel_Policy attributes
split-tunnel-policy tunnelspecified
split-tunnel-network-list value my-split
Step 6:
I assume you have a default route on your inside L3 switch point back to ASA's inside address. If you don't have one.
Please add a default or add static route as shown below.
route 10.88.61.0 mask 255.255.255.0 xxx.xxx.xxx.xxx
xxx.xxx.xxx.xxx = equal to ASA's inside interface address.
Hope this helps.
Thanks
Rizwan Rafeek

Applet to write file on IE4.0

Hi all,
Please help, the situation is like this,
server has no support for web, no Java plugin...
client browsers' are equipped only with IE4.0, and they will not be upgraded nor plugged with Java Plug-in.
On these strict circumstances, how could i run an applet to read/write files?
if the applet is converted to an application, file permission problem should be solved, but how could the clients run the CLASS/JAR files without installing JRE...
pls help, it's in ergent. (have to finish the program in this week!!)
Thank you a million!!!!!!
J.

New foundings!
As the server is running Netware 4.2, is that possible if i just install JVM on the server and problem will be solved?
J.

Apple Remote Desktop ARD 3.7 cannot drag files from local to remote.

Apple Remote Desktop ARD 3.7 cannot drag files from local to remote. I've been able to drag n drop folders and files from my local to the remotes for years until the update to 3.7. Anyone else experiencing this issue? I've tried changing preferences. No luck. Maybe I'm missing a setting somewhere.
I'm on 10.8.5. Remote is same with 3.7 client. This happens with multiple remotes.

Let me guess. The Get and Send clibboard contents buttons are greyed out too?
It is only affecting me on clients already upgraded to 3.7. None of the clients on older versions are affected.
ARD is also crashing a lot.
Most of the time I go to a screen share to a client it takes way too long, so I clock Stop, then try to connect again and works straight away.
Hopefully a patch will be released soon.

Weird error: "Cannot write file summary in a read-only environment"

Disclaimer: We are using an old version of bdb - 3.2.76 but are not able to easily upgrade.
We see this occasionally in production. From looking at the code it looks like critical eviction is happening since more memory is used then the limit we set then eviction is happening but then failing since the env is read only. I'm just wondering how it got to this point. we set the max size (je.maxMemory) to 1572864 bytes.
This is not urgent but is adding noise to logs so any suggestions would be welcome...
<application specific exception>
…causedBy com.sleepycat.je.DatabaseException: (JE 3.2.76) Cannot write file summary in a read-only environment
at com.sleepycat.je.cleaner.UtilizationProfile.putFileSummary(UtilizationProfile.java:720)
at com.sleepycat.je.cleaner.UtilizationProfile.flushFileSummary(UtilizationProfile.java:708)
at com.sleepycat.je.cleaner.UtilizationTracker.evictMemory(UtilizationTracker.java:120)
at com.sleepycat.je.evictor.Evictor.evictBatch(Evictor.java:314)
at com.sleepycat.je.evictor.Evictor.doEvict(Evictor.java:253)
at com.sleepycat.je.evictor.Evictor.doCriticalEviction(Evictor.java:279)
at com.sleepycat.je.dbi.CursorImpl.close(CursorImpl.java:690)
at com.sleepycat.je.dbi.CursorImpl.close(CursorImpl.java:660)
at com.sleepycat.je.Cursor.endRead(Cursor.java:1820)
at com.sleepycat.je.Cursor.retrieveNextAllowPhantoms(Cursor.java:1616)
at com.sleepycat.je.Cursor.retrieveNext(Cursor.java:1397)
at com.sleepycat.je.Cursor.getNext(Cursor.java:456)
...

Hi Nick,
It is strange to me also that this is happening in a read-only env. Looking at the code, we don't prevent this sort of eviction in the 3.2 release or later releases. Yet we've never seen this problem before.
This sort of eviction only happens when writing is occurring. Of course, in a read-only env there is no writing. The only way I can think of for this to occur in a read-only env is when there is a very large recovery interval -- the amount of log between the last checkpoint start and the end of the log. This can occur if you didn't close the env cleaning when you last wrote to it, or if the last checkpoint just happened to be very large.
So one thing you could try is to ensure that you have a small checkpoint when you write to the log, before opening it in read-only mode. To do this, just before you call Environment.close, call Environment.checkpoint(new CheckpointConfig().setForce(true)). This will do one checkpoint before closing the env, and then another during the close. The last checkpoint should be small.
If you can't do this, or it isn't sufficient, you could increase the je.cleaner.detailMaxMemoryPercentage env config property. This is the max amount of memory (% of total cache) used for the information that is being evicted. Since nothing can really be evicted in read-only mode, there is no harm in setting this to a much higher value than the default (2). I would try 10. This doesn't reserve or waste any memory, it just prevents this sort of eviction from occurring until a larger part of the cache is used. This is probably the simplest solution.
A third approach is to simply accept that this sort of eviction will be attempted, but try to prevent the exception. If you're willing to rebuild JE (and you're not a supported Oracle customer -- please contact us if you are), then you could simply replace the 'throws' statement with a 'return null' in src/com/sleepycat/je/cleaner/UtilizationProfile.java:
    private synchronized PackedOffsets putFileSummary(TrackedFileSummary tfs)
        throws DatabaseException {
        if (env.isReadOnly()) {
            throw new DatabaseException
                ("Cannot write file summary in a read-only environment");
        }--mark

Scanning problem. Receive error message: cannot write file. Code 10,242,7. Please help

I just purchased and installed a Canon MX 922 multi-function printer. I'm having a problem with the scanner in that the output after scanning cannot be displayed and is accompanied with an error message : Cannot write file. Code 10,242,7. This occurs when scanning documents and images. My operating system Windows XP (32). Can anyone please help me solve this problem? Thank you.

Hello. Please try the following adjustment to see if we can resolve this issue: 1. Open the IJ Scan Utility from your Desktop or the Canon Utilities listing of the Start Menu.2. Click Settings.3. On the left, choose the Auto Scan tab.4. Click the Defaults button on the lower right.5. Continue this process with each tab on the left.6. Click OK at the bottom of the Settings menu. Once this has been done, try scanning from the IJ Scan Utility to test the unit. If these troubleshooting steps do not work, feel free to call us at 1-800-OKCANON.

How To read/write file on remote server in java

Hi All,
How To read/write file on remote server in java? I mean using URL - http://www.xyz.com can I right file to that perticular server.
Thanks in advance

If your server support a means of uploading files you can.
A popular means is [http://en.wikipedia.org/wiki/WebDAV]
However, by default web server don't allow you upload files, its usually something you need to configure or install.
I suggest you have a look at your web servers documentation.

Remote Client Applet -Write File - Cannot be Done

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