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?

edited Nov 8 at 12:23

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.

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
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favorite

This question already has an answer here:

Using special auto start servlet to initialize on startup and share application data

1 answer

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?

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?

edited Nov 8 at 12:23

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
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

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?

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?

edited Nov 8 at 12:23

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

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?

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

edited Nov 8 at 12:23

asked Nov 8 at 11:12

JayC667

659718

edited Nov 8 at 12:23

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

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 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

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 |

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

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

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

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

add a comment |

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