FAQ: Problems in Ubuntu Linux

[kano]

Phenomemon
Ubuntu Linux has severe problems in Java and Java Web Start.
https://bugs.launchpad.net/ubuntu/+source/sun-java6
However, Ubuntu 8.10 with sun-java6-jdk (1.6.0_10), not openjdk-6-jdk, seems working fine.

Thanks Bart and Goran for your reports!


Bugs (probably) Related
Picked some of the bugs which seems related to U-Compare.

https://bugs.launchpad.net/ubuntu/+sour ... bug/154975
https://bugs.launchpad.net/ubuntu/+sour ... bug/147449
https://bugs.launchpad.net/ubuntu/+sour ... bug/173823
https://bugs.launchpad.net/ubuntu/+sour ... bug/182971
https://bugs.launchpad.net/ubuntu/+sour ... bug/200172
https://bugs.launchpad.net/ubuntu/+sour ... bug/205647
https://bugs.launchpad.net/ubuntu/+sour ... bug/216457
https://bugs.launchpad.net/ubuntu/+sour ... bug/291135

If you could use U-Compare without problem in Ubuntu, please post your precise version information to share with other users. Thanks!

[stephen]

Running Ubuntu 8.10 using Sun Java 1.6.0_10 32-bit and U-Compare still complains, any ideas?

java.net.UnknownHostException: u-compare.org
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:519)
at java.net.Socket.connect(Socket.java:469)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:233)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:323)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:837)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:778)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:703)
at com.sun.deploy.net.BasicHttpRequest.doRequest(BasicHttpRequest.java:185)
at com.sun.deploy.net.BasicHttpRequest.doRequest(BasicHttpRequest.java:113)
at com.sun.deploy.net.BasicHttpRequest.doGetRequest(BasicHttpRequest.java:78)
at com.sun.deploy.net.DownloadEngine.actionDownload(DownloadEngine.java:1130)
at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java:1456)
at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java:1434)
at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java:1537)
at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java:1465)
at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java:211)
at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java:195)
at com.sun.javaws.Launcher.updateFinalLaunchDesc(Launcher.java:297)
at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:167)
at com.sun.javaws.Launcher.launch(Launcher.java:111)
at com.sun.javaws.Main.launchApp(Main.java:315)
at com.sun.javaws.Main.continueInSecureThread(Main.java:219)
at com.sun.javaws.Main$1.run(Main.java:107)
at java.lang.Thread.run(Thread.java:619)

[kano]

Hi Stephen,

Thank you for your interest in U-Compare!

Your problem seems to be a common issue of Java Web Start in Ubuntu; not using the network connection setting properly.

a) First, this JWS setting might be related to this problem (select Direct Connection):
viewtopic.php?f=2&t=6

b)I have also updated the launcher jnlp file to include this setting:
<property name="java. net.preferIPv4Stack" value="true" />
might solve the problem as well.

As an ad hoc solution, adding u-compare.org domain to the /etc/host.conf setting will make it work,
but before testing this one, would you please try b) and a)?
It is very helpful for us when you could report the result on your Ubuntu. Thanks!

-Yoshinobu