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问题:
I'm new to Gradle build system. I want to do some basic functions on it. I'm running/building it in command line. I am referring User guide. And, doing some simple tasks.
When I start to run simple tasks, it was build successfully. But, After some times, it is showing "It is currently in use by another Gradle instance" and becomes BUILD FAILED. I'm using a terminal for run the task. I didn't run anything at that time.
If I closed the terminal which generate the error, this problem would be solved. But, I know that it is not the solution for that.
Why is this error coming frequently?
How to solve it?
And, Please refer any link to improve my knowledge on Gradle Build system in Android.
回答1:
Remove the lock files in the gradle cache by executing something like this:
find ~/.gradle -type f -name "*.lock" | while read f; do rm $f; done
回答2:
I was stuck with this error and had to blow away the contents of my user's .gradle/caches/ folder and the contents of my project's .gradle/ folder to get going again.
Not sure what caused it, possibly a failed build that kept these files in a locked state?
回答3:
This may be happening because there is more than just once instance of Android Studio.
回答4:
Just kill java.exe process fix my problem.
-- Edit --
if not fixed then:
- kill OpenJdkPlatform proccess.
if not fixed then:
- remove all ".lock" file from .gradle directory and sub directories (windows: C:\Users\Username\.gradle).
if not fixed then:
- rename or delete .gradle directory and try again.
回答5:
It was not necessary for me to remove any files to fix this error.
The issue I had is that Gradle instances had hung and were 6 command prompt entries in my task list that were spawned by Java.
Forcing the command prompt instances to close allowed me to continue work as usual.
回答6:
Its Work for me for Problem:-
"Error:Timeout waiting to lock jars It is currently in use by another Gradle instance. Owner PID: 6896 Our PID: 5048 Owner Operation: Our operation: Lock"
Solution:-
- close the Android Studio and Open Task manager and end the process java.exe
- open the derectory ....gradle\caches.
- Delete the jar2.lock file.
- Open android Studion and clean the project.
回答7:
Have tried all this answers, including kill java process, delete .gradle in HOME_DIR and in project dir, restarted Android Studio, and even restarted OS.
It started to work normally only after I launched gradle sync.
回答8:
Very simple solution:
no need to kill Android Studio , just Kill OpenJdkPlatform process, then delete the .lock file located in:
rootProject/.gradle//taskHistory
回答9:
While killing the process and/or removing the lock file works, Gradle should be able to handle this on its own, solving the problem permanently. This problem report hints at the solution: Gradle cannot communicate with the gradle service.
Have a look at your local network firewall. In my case,
allowing outbound traffic from 127.0.0.1 to 127.0.0.1,
sudo iptables -A OUTPUT -p udp -s 127.0.0.1 -d 127.0.0.1 -j ACCEPT
allowing incoming traffic from 127.0.0.1
sudo iptables -A INPUT -s 127.0.0.1 -p udp -j ACCEPT
solved the issue. A discussion of a similar problem at github.
And, Please refer any link to improve my knowledge on Gradle Build system in Android.
The udacity gradle course, if you have some time.
回答10:
For Windows machine:
Open Task Manager(Ctrl-Alt-Delete and check Process)
-> If you run two instance of android studio, Close One (End Task)
-> Then close OpenJDK Platform Binary
-> Gradle sync now on AndroidStudio and it will work now
回答11:
For Windows OS:
I figured it had something to do with a lock file so i simply went to .gradle\buildOutputCleanup in the project folder and deleted the cache.properties.lock file and rebuilt the project. It was working perfectly.
回答12:
open terminal and move to project path then run depending on the operation system: gradlew clean or ./gradlew clean
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