CODEWITHSUNDEEP
javalinuxubuntugnu-screen
miltos
miltos

Reputation: 89

Java error when combined with screen command in ubuntu

I am running a Linux 2.6.38-10-server #46-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux and I have the following problem:

1) I log in ssh

2) I start a screen (using the screen command)

3) I start a java program " java -jar ../mlJar.jar > eval1" and pipe the output to eval1

4) I detach the screen (Ctrl+A, Crtl+D)

5) The program will run correctly unless I log-off

6) After logging off and when the java app tries to open a file it throws the following exception

java.io.FileNotFoundException: /path/to/my/file.arff (No such file or directory) at java.io.FileInputStream.open(Native Method) at java.io.FileInputStream.<init>(FileInputStream.java:120) at java.io.FileInputStream.<init>(FileInputStream.java:79) at java.io.FileReader.<init>(FileReader.java:41) at gr.auth.ee.lcs.utilities.InstancesUtility.openInstance(InstancesUtility.java:74) at gr.auth.ee.lcs.data.representations.complex.ComplexRepresentation.<init>(ComplexRepresentation.java:834) at gr.auth.ee.lcs.data.representations.complex.StrictMultiLabelRepresentation.<init>(StrictMultiLabelRepresentation.java:456) at gr.auth.ee.lcs.implementations.SequentialUCS.<init>(SequentialUCS.java:165) at gr.auth.ee.lcs.implementations.SequentialUCS.createNew(SequentialUCS.java:196) at gr.auth.ee.lcs.FoldEvaluator.evaluate(FoldEvaluator.java:153) at gr.auth.ee.lcs.implementations.global.AllMlTypes.main(AllMlTypes.java:69) Exception in thread "main" java.lang.NullPointerException at gr.auth.ee.lcs.FoldEvaluator.loadFold(FoldEvaluator.java:211) at gr.auth.ee.lcs.FoldEvaluator.evaluate(FoldEvaluator.java:155) at gr.auth.ee.lcs.implementations.global.AllMlTypes.main(AllMlTypes.java:69)

Which probably means that this happens because the JVM has "lost" it's access rights to the folder.

Can anyone help with how to solve the problem. In other versions of linux this doesn't happen. Is there any configuration in Linux that can sort this out?

Thanks!

Upvotes: 3

Views: 265

Answers (1)

NPE
NPE

Reputation: 500257

I suspect that your home directory might be encrypted (using ecryptfs) and might be getting unmounted when you log off.

There is a bug report here: https://bugs.launchpad.net/ecryptfs/+bug/525562

I believe the auto-unmounting can be stopped by removing ~/.ecryptfs/auto-unmount

Upvotes: 5

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