jpa jar

[Matthew Broadhead]

seems like this must have been asked before...i have been moving some
common database code into a jar file and it works great.  but it is
included in several wars and those projects load the jar individually
each time.  i wondered if there is a way to load a jar only once into
TomEE and have it commonly accessed across all webapps?

[Luis Rodríguez Fernández]

Hello Matthew,

Probably the common classloader is the place for your jar, see [1]

Otherwise you could also packed all your apps in an .ear file and add your
.jar there. In tomee you can deploy .ear files as well [2]. For this
approach you have to declare the apps folder in conf/tomee.xml

<tomee>
<!-- see http://tomee.apache.org/containers-and-resources.html -->

<!-- activate next line to be able to deploy applications in apps -->
<Deployments dir="apps" autoDeploy="true"/>
</tomee>


Hope it helps,

Luis

[1] https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
[2] http://tomee.apache.org/deploying-in-tomee.html

El mié., 31 oct. 2018 a las 13:54, Matthew Broadhead

Post by Matthew Broadhead
seems like this must have been asked before...i have been moving some
common database code into a jar file and it works great. but it is
included in several wars and those projects load the jar individually
each time. i wondered if there is a way to load a jar only once into
TomEE and have it commonly accessed across all webapps?

[Matthew Broadhead]

Hi Luis,

When using method [1] does the jar have to be manually dropped into a
common folder defined in the config?  That would be a pain.

What would be great if i could add some meta in the jar which means it
gets picked up by the common loader when scanned by future wars

i have lookeds into EARs but I need some time to get my head around it.
At the moment I use Tomcat virtual hosts in production although I want
to change it so that httpd is doing the proxying

Post by Luis Rodríguez Fernández
Hello Matthew,
Probably the common classloader is the place for your jar, see [1]
Otherwise you could also packed all your apps in an .ear file and add your
.jar there. In tomee you can deploy .ear files as well [2]. For this
approach you have to declare the apps folder in conf/tomee.xml
<tomee>
<!-- see http://tomee.apache.org/containers-and-resources.html -->
<!-- activate next line to be able to deploy applications in apps -->
<Deployments dir="apps" autoDeploy="true"/>
</tomee>
Hope it helps,
Luis
[1] https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
[2] http://tomee.apache.org/deploying-in-tomee.html
El mié., 31 oct. 2018 a las 13:54, Matthew Broadhead

Post by Matthew Broadhead
seems like this must have been asked before...i have been moving some
common database code into a jar file and it works great. but it is
included in several wars and those projects load the jar individually
each time. i wondered if there is a way to load a jar only once into
TomEE and have it commonly accessed across all webapps?

[Luis Rodríguez Fernández]

Hello Matthew,

mmm, yes every jar that you drop in the common classloader will be visible
to all webapps.

- "meta in the jar": mmm, yes, e.g. in our weblogic servers we have exactly
that case...
-In the META-INF/MANIFEST.MF of the shared jar:
Extension-Name: commonFilters
Specification-Version: 1.0
Implementation-Version: 1.8
- In the webapps:
Extension-List: ssoFilters
ssoFilters-Extension-Name: commonFilters
ssoFilters-Specification-Version: 1.0
ssoFilters-Implementation-Version: 1.8

... and in weblogic we deploy the jar as a library. You can have a look at
https://docs.oracle.com/javase/6/docs/technotes/guides/extensions/versioning.html

For me the simplest would be to copy your jar to $CATALINA_BASE/lib.

Hope it helps,

Luis













El mié., 31 oct. 2018 a las 14:28, Matthew Broadhead

Post by Matthew Broadhead
Hi Luis,
When using method [1] does the jar have to be manually dropped into a
common folder defined in the config? That would be a pain.
What would be great if i could add some meta in the jar which means it
gets picked up by the common loader when scanned by future wars
i have lookeds into EARs but I need some time to get my head around it.
At the moment I use Tomcat virtual hosts in production although I want
to change it so that httpd is doing the proxying

Post by Luis Rodríguez Fernández
Hello Matthew,
Probably the common classloader is the place for your jar, see [1]
Otherwise you could also packed all your apps in an .ear file and add

your

Post by Luis Rodríguez Fernández
.jar there. In tomee you can deploy .ear files as well [2]. For this
approach you have to declare the apps folder in conf/tomee.xml
<tomee>
<!-- see http://tomee.apache.org/containers-and-resources.html -->
<!-- activate next line to be able to deploy applications in apps -->
<Deployments dir="apps" autoDeploy="true"/>
</tomee>
Hope it helps,
Luis
[1] https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
[2] http://tomee.apache.org/deploying-in-tomee.html
El mié., 31 oct. 2018 a las 13:54, Matthew Broadhead

Post by Matthew Broadhead
seems like this must have been asked before...i have been moving some
common database code into a jar file and it works great. but it is
included in several wars and those projects load the jar individually
each time. i wondered if there is a way to load a jar only once into
TomEE and have it commonly accessed across all webapps?

[Matthew Broadhead]

Thank Luis,

I will try following your 2nd method.

I found this link to skinny wars for maven-ear-plugin
https://maven.apache.org/plugins/maven-ear-plugin/examples/skinny-wars.html

It seems very similar to your weblogic example with the MANIFEST.MF
configuration

It should work in my case if I change my virtual host setup

Post by Luis Rodríguez Fernández
Hello Matthew,
mmm, yes every jar that you drop in the common classloader will be visible
to all webapps.
- "meta in the jar": mmm, yes, e.g. in our weblogic servers we have exactly
that case...
Extension-Name: commonFilters
Specification-Version: 1.0
Implementation-Version: 1.8
Extension-List: ssoFilters
ssoFilters-Extension-Name: commonFilters
ssoFilters-Specification-Version: 1.0
ssoFilters-Implementation-Version: 1.8
... and in weblogic we deploy the jar as a library. You can have a look at
https://docs.oracle.com/javase/6/docs/technotes/guides/extensions/versioning.html
For me the simplest would be to copy your jar to $CATALINA_BASE/lib.
Hope it helps,
Luis
El mié., 31 oct. 2018 a las 14:28, Matthew Broadhead

Post by Matthew Broadhead
Hi Luis,
When using method [1] does the jar have to be manually dropped into a
common folder defined in the config? That would be a pain.
What would be great if i could add some meta in the jar which means it
gets picked up by the common loader when scanned by future wars
i have lookeds into EARs but I need some time to get my head around it.
At the moment I use Tomcat virtual hosts in production although I want
to change it so that httpd is doing the proxying

Post by Luis Rodríguez Fernández
Hello Matthew,
Probably the common classloader is the place for your jar, see [1]
Otherwise you could also packed all your apps in an .ear file and add

your

Post by Luis Rodríguez Fernández
.jar there. In tomee you can deploy .ear files as well [2]. For this
approach you have to declare the apps folder in conf/tomee.xml
<tomee>
<!-- see http://tomee.apache.org/containers-and-resources.html -->
<!-- activate next line to be able to deploy applications in apps -->
<Deployments dir="apps" autoDeploy="true"/>
</tomee>
Hope it helps,
Luis
[1] https://tomcat.apache.org/tomcat-8.0-doc/class-loader-howto.html
[2] http://tomee.apache.org/deploying-in-tomee.html
El mié., 31 oct. 2018 a las 13:54, Matthew Broadhead

Post by Matthew Broadhead
seems like this must have been asked before...i have been moving some
common database code into a jar file and it works great. but it is
included in several wars and those projects load the jar individually
each time. i wondered if there is a way to load a jar only once into
TomEE and have it commonly accessed across all webapps?