Syncworld java util prefs filesystempreferences

CA Release Automation — Release Operations Center (Nolio) CA Release Automation — DataManagement Server (Nolio)

Issue/Introduction

While trying to install the Release Automation Agent on AIX it returns the following error messages:

Nov, 16, 2017 2:56:18 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode

WARNING: Could not lock System prefs.Unix error code 0.

Nov, 16, 2017 2:56:18 PM java.util.prefs.FileSystemPreferences syncWorld

WARNING: Couldn’t flush system prefs: java.util.prefs.BackingStoreException: Couldn’t get file lock.

The terminal would still give its normal prompts for the installer with these types of messages periodically showing up.

Environment

Cause

The cause is related to a files in a directory (a $HOME/.java/.userPrefs) that seem to be conflicting with files that are trying to be used during the installation.

Resolution

These steps were used to successfully install the agent without these messages appearing:

mkdir -p $HOME/.java2/.systemPrefs
mkdir -p $HOME/.java2/.userPrefs
chmod -R 755 ~/.java2
export JAVA_OPTS=»-Djava.util.prefs.systemRoot=$HOME/.java2 -Djava.util.prefs.userRoot=$HOME/.java2/.userPrefs»
export _JAVA_OPTS=»-Djava.util.prefs.systemRoot=$HOME/.java2 -Djava.util.prefs.userRoot=$HOME/.java2/.userPrefs»
export INSTALL4J_ADD_VM_PARAMS=»-Djava.util.prefs.systemRoot=$HOME/.java2 -Djava.util.prefs.userRoot=$HOME/.java2/.userPrefs»
./nolio_agent_aix_6_3_0_b9622.sh

Note: $HOME was used exactly as is in steps 1 and 2. In steps 4-6 we replaced $HOME with the absolute directory path that $HOME evaluates to. Ex: /home/myusername

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Feature to avoid «Couldn’t flush user prefs: java.util.prefs.BackingStoreException: Couldn’t get file lock.» #106

Comments

One of the issues we ran up against with a number of our long-running gwt-maven-plugin compile (jenkins) jobs was that the default Java preferences factory (and the rest of that code) would run into file lock problems because of the length of the compile process.

[ERROR] Nov 19, 2014 6:12:49 PM java.util.prefs.FileSystemPreferences syncWorld [ERROR] WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock. [ERROR] Nov 19, 2014 6:13:22 PM java.util.prefs.FileSystemPreferences syncWorld [ERROR] WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.

There’s a decent analysis/write-up of the problem here.

It would be easy enough to add an option to the gwt-maven-plugin compile mojo to avoid this problem.

I will submit a pull request after submitting this issue with one approach to fixing this problem.

The text was updated successfully, but these errors were encountered:

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java.util.Prefs выбрасывает BackingStoreException — почему?

У меня есть система, которая кэширует крошечные/простые результаты вызова SOAP при запуске Мне нужны экземпляры, чтобы перезагрузить их кеш при запуске (в случае, если служба SOAP мертва) и ТАКЖЕ обрабатывают возможность использования нескольких экземпляров с использованием этого файла кэша Я выбрал использовать java.util.prefs , но встроенный в автоматическую синхронизацию поток Java прерывается с ошибкой (1% времени с использованием синхронизации хранилища по умолчанию JVM 30s), сбрасывая следующее исключение:

Jan 8, 2010 12:30:07 PM java.util.prefs.FileSystemPreferences syncWorld WARNING: Couldn't flush user prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.

Я подозревал эту ошибку, но это было исправлено в 1.5 (tiger-b40), а наш java 5 в этом поле «1.5.0_16- b02». Теперь я подозреваю, что это может быть потому, что у нас есть несколько JVM, которые используют этот Backing Store, хотя это, похоже, не происходит на наших других машинах. Может ли кто-нибудь подтвердить это? Каковы риски, если таковые имеются? Если мой подход ошибочен, что я должен использовать в качестве альтернативы?

Определенно звучит так, как будто это связано с несколькими JVM, пытающимися работать с одним файлом. Люди склонны использовать базы данных для централизации данных, которые будут совместно использоваться и изменяться одновременно несколькими процессами.

API java.util.prefs — это индейка. Я предлагаю игнорировать это и использовать то, что на самом деле используют другие люди, например, базу данных.

Я вообще не хочу делиться данными, я просто пытаюсь создать дешевую конфигурацию (из SOAP-вызова) кеша. БД слишком тяжелый

Это отличная критика API настроек и того, что можно сделать, чтобы обойти такие проблемы, как исключения в таймере синхронизации. allaboutbalance.com/articles/disableprefs Я написал свою собственную блокировку / кэширование файлов с использованием Java NIO в System.getProperty («java.io.tmpdir»). Удачи!

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Java.lang.SecurityException: Could not lock User prefs. Lock file access denied

But I am not root, getting someone to run root is expensive and I have multiple users running jvms, does that mean i have to create those files and set up permissions just so that all users have access with those privileges? This can occur if you’ve started some Java app from a different user (such as root) and the directory was created with the permissions for that user.

Java.lang.SecurityException: Could not lock User prefs. Lock file access denied

When running Intellij Ultimate (version 2019.3.1) it throws this error:

Internal error. Please refer to http://jb.gg/ide/critical-startup-errors java.lang.SecurityException: Could not lock User prefs. Lock file access denied. at java.prefs/java.util.prefs.FileSystemPreferences.checkLockFile0ErrorCode(FileSystemPreferences.java:956) at java.prefs/java.util.prefs.FileSystemPreferences.lockFile(FileSystemPreferences.java:944) at java.prefs/java.util.prefs.FileSystemPreferences.sync(FileSystemPreferences.java:748) at java.prefs/java.util.prefs.FileSystemPreferences.flush(FileSystemPreferences.java:843) at java.prefs/java.util.prefs.FileSystemPreferences.syncWorld(FileSystemPreferences.java:483) at java.prefs/java.util.prefs.FileSystemPreferences$3.run(FileSystemPreferences.java:450) at java.base/java.util.TimerThread.mainLoop(Timer.java:556) at java.base/java.util.TimerThread.run(Timer.java:506) ----- JRE 11.0.5+10-b520.17 amd64 by JetBrains s.r.o

This User prefs error I presume is the reason why I have to setup and activate IntelliJ each time it is opened.

~/.java/.userPrefs directory, one of its subdirectories or the individual file has wrong permissions so that JVM is not able to write there.

This can occur if you’ve started some Java app from a different user (such as root) and the directory was created with the permissions for that user.

Another possible reason is that some other process is already holding a lock and manipulating the Java Preferences at the same time.

If it’s some other process holding the lock, you can try to find and kill it.

If it’s the permissions issue, the easiest solution is to just sudo rm -rf ~/.java/.userPrefs and then start the IDE again.

You can of course inspect the actual owner/permissions for this location and fix them using chown / chmod (recursively with the -R switch).

It’s also worth checking the permissions of the .java directory itself and as the last resort you can delete it.

Wso2is — WSO2 Identity Server, I have a recent installation of wso2 Identity Server 5.7.0 with a Citrix Netscaler load balancer as a front end. Single Sign On is working well, but the Dashboard eventually times out and I get

Preferences-systems tries to write a lock file at a location where «normal» users have no write permissions on Linux

I am using system prefrences for testing my code i observed some peculiar things on java 1.5

private void loadEmptyPreferences() throws IOException, InvalidPreferencesFormatException, BackingStoreException < ClassLoader contextClassLoader = Thread.currentThread() .getContextClassLoader(); InputStream stream = contextClassLoader .getResourceAsStream("example.xml"); if (stream == null) < fail("Could not load preferences file"); >Preferences pref = Preferences.systemRoot().node("test"); pref.removeNode(); Preferences.importPreferences(stream); >

java.lang.securityexception: Could not lock System prefs.Lock file access denied. at java.util.prefs.FileSystemPreferences.checkLockFile0ErrorCode(FileSystemPreferences.java:919) at java.util.prefs.FileSystemPreferences.lockFile(FileSystemPreferences.java:908) at java.util.prefs.FileSystemPreferences.removeNode(FileSystemPreferences.java:656)

The reason is that the preferences-systems tries to write a lock file at a location where «normal» users have no write permissions on Linux (/opt/j2se/linux/ix86/j2se_1.5.0_22/jre/.systemPrefs/.system.lock)

How to solve this?Should we use properties?

Preferences.systemRoot() returns the system-wide (i.e. root only) preferences. They can’t be changed by non-privileged users.

If you need to change settings for normal users, try using userRoot() instead.

This is a really pesky issue Java running on *nix based servers.

I was able to solve it by using the following vm args:

-Djava.util.prefs.userRoot=/opt/apache-tomcat-7.0.50/uprefs -Djava.util.prefs.systemRoot=/opt/apache-tomcat-7.0.50/sprefs

One important note though on the systemRoot path is to create a sub-folder within it named .systemPrefs or it will not work.

Also, don’t forget to chown -R these directories to the user running the java application (in my case it was tomcat).

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Java system preferences under different users in linux

I’m trying to run multiple jvms (including tomcat) under different users on one linux box. I’m not seeing too many issues, but in catalina.out I keep seeing this:

May 30, 2014 1:16:16 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 7626 ms May 30, 2014 1:16:37 PM java.util.prefs.FileSystemPreferences$2 run WARNING: Could not create system preferences directory. System preferences are unusable. May 30, 2014 1:16:55 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode WARNING: Could not lock System prefs. Unix error code -158097957. May 30, 2014 1:16:55 PM java.util.prefs.FileSystemPreferences syncWorld WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: Couldn't get file lock.

I did some digging/reading and deduced the following:

An administrator with root access must create the system preferences directory /etc/.java/.systemPrefs with drwxr-xr-x access.

Java’s looking for /etc/.java/.systemPrefs/.system.lock and /etc/.java/.systemPrefs/.systemRootModFile

Manually creating the above files (use «touch» to create empty files) and their containing directories should fix. Rights to the files should be 544 , rights to their directories should be 755 , owner and group are root for all.

I am not root, getting someone to run root is expensive and I have multiple users running jvms, does that mean i have to create those files and set up permissions just so that all users have access with those privileges?

Has anyone ever run into this issue and if they have is there a simpler solution i am missing?

Set these settings per user:

mkdir -p ~/.java/.systemPrefs mkdir ~/.java/.userPrefs chmod -R 755 ~/.java export JAVA_OPTS="-Djava.util.prefs.systemRoot=/home/user/.java -Djava.util.prefs.userRoot=/home/user/.java/.userPrefs"

Without creating the directories, some Java virtual machines default to /etc/ .

See also: Java — Setting Preferences backingstore directory

My thinking is that even though you have different users, the JVM still reads tomcat as one user since it’s the same process. Perhaps what you need is a user management mechanism? Log in and log out

I fixed this by setting the permissions of my Bash program executing to 755

Simply give full permission to /etc/.java

Error during jmeter traffic execution. «Couldn’t flush user, You can check the current limit by running ulimit -n command If you have superuser permissions you can ramp-up this limit according to the number of threads you’re using If you don’t have root access — the only solution would be finding another machine and running your JMeter test in distributed mode Share …

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