How to get Server/Servlet Context without HttpServlet or HttpServletRequest? [duplicate]
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Using special auto start servlet to initialize on startup and share application data
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Suppose I host a JavaEE WebApp on Payara/Glassfish (or any other WebContainer for that matter).
I would reach the Servlets under the address https://a.b/appname/myservleturlpattern or as https://a.b/myservleturlpattern if the VirtualServer-Config points to the app as default.
Usually I can get that address easily inside any HttpServlet (ServletContext).
But now, when I'm running a Background task (@Schedule) in a non-servlet class, how would I get that address?
What I want: get the app's base address https://a.b/appname/ or as https://a.b/ from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
So far, my only idea is to listen to all my Servlets (extending the same custom HttpServlet anyway) and on the first call set a static variable, but thats really really unclean and hack-isch.
Any better ideas?
java-ee web-applications
asked Nov 8 at 11:12
JayC667
659718
marked as duplicate by BalusC java-ee
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Nov 8 at 20:32
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
add a comment |
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This question already has an answer here:
Using special auto start servlet to initialize on startup and share application data
1 answer
Suppose I host a JavaEE WebApp on Payara/Glassfish (or any other WebContainer for that matter).
I would reach the Servlets under the address https://a.b/appname/myservleturlpattern or as https://a.b/myservleturlpattern if the VirtualServer-Config points to the app as default.
Usually I can get that address easily inside any HttpServlet (ServletContext).
But now, when I'm running a Background task (@Schedule) in a non-servlet class, how would I get that address?
What I want: get the app's base address https://a.b/appname/ or as https://a.b/ from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
So far, my only idea is to listen to all my Servlets (extending the same custom HttpServlet anyway) and on the first call set a static variable, but thats really really unclean and hack-isch.
Any better ideas?
java-ee web-applications
asked Nov 8 at 11:12
JayC667
659718
marked as duplicate by BalusC java-ee
Users with the java-ee badge can single-handedly close java-ee questions as duplicates and reopen them as needed.
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Nov 8 at 20:32
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
1
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51
add a comment |
up vote
0
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favorite
up vote
0
down vote
favorite
This question already has an answer here:
Using special auto start servlet to initialize on startup and share application data
1 answer
Suppose I host a JavaEE WebApp on Payara/Glassfish (or any other WebContainer for that matter).
I would reach the Servlets under the address https://a.b/appname/myservleturlpattern or as https://a.b/myservleturlpattern if the VirtualServer-Config points to the app as default.
Usually I can get that address easily inside any HttpServlet (ServletContext).
But now, when I'm running a Background task (@Schedule) in a non-servlet class, how would I get that address?
What I want: get the app's base address https://a.b/appname/ or as https://a.b/ from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
So far, my only idea is to listen to all my Servlets (extending the same custom HttpServlet anyway) and on the first call set a static variable, but thats really really unclean and hack-isch.
Any better ideas?
java-ee web-applications
asked Nov 8 at 11:12
JayC667
659718
This question already has an answer here:
Using special auto start servlet to initialize on startup and share application data
1 answer
Suppose I host a JavaEE WebApp on Payara/Glassfish (or any other WebContainer for that matter).
I would reach the Servlets under the address https://a.b/appname/myservleturlpattern or as https://a.b/myservleturlpattern if the VirtualServer-Config points to the app as default.
Usually I can get that address easily inside any HttpServlet (ServletContext).
But now, when I'm running a Background task (@Schedule) in a non-servlet class, how would I get that address?
What I want: get the app's base address https://a.b/appname/ or as https://a.b/ from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
So far, my only idea is to listen to all my Servlets (extending the same custom HttpServlet anyway) and on the first call set a static variable, but thats really really unclean and hack-isch.
Any better ideas?
This question already has an answer here:
Using special auto start servlet to initialize on startup and share application data
1 answer
java-ee web-applications
java-ee web-applications
asked Nov 8 at 11:12
JayC667
659718
asked Nov 8 at 11:12
JayC667
659718
edited Nov 8 at 12:23
asked Nov 8 at 11:12
JayC667
659718
asked Nov 8 at 11:12
JayC667
659718
asked Nov 8 at 11:12
JayC667
659718
659718
marked as duplicate by BalusC java-ee
Users with the java-ee badge can single-handedly close java-ee questions as duplicates and reopen them as needed.
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Nov 8 at 20:32
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
marked as duplicate by BalusC java-ee
Users with the java-ee badge can single-handedly close java-ee questions as duplicates and reopen them as needed.
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Nov 8 at 20:32
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
1
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51
add a comment |
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
1
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
1
1
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51
add a comment |
1 Answer
1
active
oldest
votes
up vote
1
down vote
accepted
ServletContextListener serves exactly this purpose but there may be better solutions depending on what you want to do with with it
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
ServletContextListener serves exactly this purpose but there may be better solutions depending on what you want to do with with it
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
add a comment |
up vote
1
down vote
accepted
ServletContextListener serves exactly this purpose but there may be better solutions depending on what you want to do with with it
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
add a comment |
up vote
1
down vote
accepted
up vote
1
down vote
accepted
ServletContextListener serves exactly this purpose but there may be better solutions depending on what you want to do with with it
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
ServletContextListener serves exactly this purpose but there may be better solutions depending on what you want to do with with it
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
answered Nov 8 at 11:38
Lev Kuznetsov
1,8751923
1,8751923
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
add a comment |
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
Awesome! Thanx! Didnt think about the initializers...
– JayC667
Nov 8 at 12:33
add a comment |
What do you want from the servlet context?
– Lev Kuznetsov
Nov 8 at 11:29
What I want: get the app's base address a.b/appname or as a.b from any class, especially from non-Servlet classes. (Cant get and don't need the myservleturlpattern because I'm not in a servlet.)
– JayC667
Nov 8 at 12:23
1
You can't get that information without a request. The container isn't aware of any of the routes a client may reach it, which is actually almost always numerous. It's available with a request because the client tells the container how it called the container. If you have to have this information I suggest you instead make an endpoint available and use a cron job to call it externally. Ideally your app should not depend on this, it makes deployments difficult. Your own solution doesn't work: what if no requests are made before the schedule?
– Lev Kuznetsov
Nov 8 at 12:35
Yeah, I know that my solution is not the best. Ticket stackoverflow.com/questions/53206594/… has exactly the same problems as I do... Thought I can guarantee that I will not be behind load balancing or proxies.
– JayC667
Nov 8 at 12:38
Proper Linkt to other topic: stackoverflow.com/questions/675730/…
– JayC667
Nov 8 at 12:51