Fill a singleton once and access data from all threads in java
I am on my cell phone now, so I have no code here. But it's simple.
I have one static class working as a singleton in a web app.
That class is called on the start of the application (when I use to fill my singleton passing a parameter after a database call). The problem is, that when I call that class again from a different static class (on a different thread), my data is not there. But if I use the same class which I used to fill, the data is there. What can I do to access my singleton from all classes/threads and get the data?
UPDATE
Hey guys, i solved it. The problem was that my system had two separated packages (linked by a rest service). My singleton was called by that two packages so i got different threads. The solution was create a method and get my singleton by the same package.
java multithreading singleton memory-visibility
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
add a comment |
I am on my cell phone now, so I have no code here. But it's simple.
I have one static class working as a singleton in a web app.
That class is called on the start of the application (when I use to fill my singleton passing a parameter after a database call). The problem is, that when I call that class again from a different static class (on a different thread), my data is not there. But if I use the same class which I used to fill, the data is there. What can I do to access my singleton from all classes/threads and get the data?
UPDATE
Hey guys, i solved it. The problem was that my system had two separated packages (linked by a rest service). My singleton was called by that two packages so i got different threads. The solution was create a method and get my singleton by the same package.
java multithreading singleton memory-visibility
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
2
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
1
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27
add a comment |
I am on my cell phone now, so I have no code here. But it's simple.
I have one static class working as a singleton in a web app.
That class is called on the start of the application (when I use to fill my singleton passing a parameter after a database call). The problem is, that when I call that class again from a different static class (on a different thread), my data is not there. But if I use the same class which I used to fill, the data is there. What can I do to access my singleton from all classes/threads and get the data?
UPDATE
Hey guys, i solved it. The problem was that my system had two separated packages (linked by a rest service). My singleton was called by that two packages so i got different threads. The solution was create a method and get my singleton by the same package.
java multithreading singleton memory-visibility
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
I am on my cell phone now, so I have no code here. But it's simple.
I have one static class working as a singleton in a web app.
That class is called on the start of the application (when I use to fill my singleton passing a parameter after a database call). The problem is, that when I call that class again from a different static class (on a different thread), my data is not there. But if I use the same class which I used to fill, the data is there. What can I do to access my singleton from all classes/threads and get the data?
UPDATE
Hey guys, i solved it. The problem was that my system had two separated packages (linked by a rest service). My singleton was called by that two packages so i got different threads. The solution was create a method and get my singleton by the same package.
java multithreading singleton memory-visibility
java multithreading singleton memory-visibility
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
edited Nov 26 '18 at 14:22
Caio Rodrigo
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
asked Nov 23 '18 at 14:30
Caio RodrigoCaio Rodrigo
12
12
2
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
1
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27
add a comment |
2
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
1
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27
2
2
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
1
1
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27
add a comment |
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2
Without code it is difficult to guess but this sound like you either need to use the volatile modifier or use Atomics.
– OldCurmudgeon
Nov 23 '18 at 14:44
1
Thanks buddy, I will take a look and update the code since I get home
– Caio Rodrigo
Nov 23 '18 at 14:47
It doesn't look like you have created a singleton. Please upload the code.
– uneq95
Nov 24 '18 at 23:27