Dynamic jar loading

[nextgenhealthcare]

Dynamic jar loading

[narupley]

That should be possible! The POST /server/resources/{resourceId}/_reload endpoint in the API can be used to programmatically reload a resource. The "default" resource created automatically with Connect points to the custom-lib folder and has an ID of Default Resource.

[redeemefy]

That should be possible! The POST /server/resources/{resourceId}/_reload endpoint in the API can be used to programmatically reload a resource. The "default" resource created automatically with Connect points to the custom-lib folder and has an ID of Default Resource.

Questions about that approach:

1. Do all channels are going to bounce when the resource reload happens?
2. If so, Does Mirth will finish all channels that currently are processing msgs and once that is done then load the library.

I'm trying to avoid the loss of any msg in this process.

Thanks

[narupley]

No channels will need to be redeployed and no messages will be interrupted. After the library resource is reloaded, on the next message your channel processes the new ClassLoader should be used, for example in a JavaScript script that uses your custom JAR.

[redeemefy]

No channels will need to be redeployed and no messages will be interrupted. After the library resource is reloaded, on the next message your channel processes the new ClassLoader should be used, for example in a JavaScript script that uses your custom JAR.

This is awesome!
Thanks @narupley

[redeemefy]

I want to followup in this question. I have a custom library that I wrote that I putted it in the custom_lib folder. After that I clicked the reload button. I'm getting the error that the function is not found. I'm afraid that clicking the reload button is not refreshing/reloading/clearing some sort of heap/ram/database.

My idea of utilizing a library in jar was to avoid to bounce Mirth.

Does anyone can bring some light to this issue?

[narupley]

Does the JAR file should show up in the list of files in the Resource settings? You also need to make sure that the channel you're using includes that resource in the proper context (Summary tab, Set Dependencies, Library Resources). If you're using a custom library in the global scripts not tied to any channel, there is an option for that on the Directory Resource settings page.

[redeemefy]

Does the JAR file should show up in the list of files in the Resource settings?

It does.

You also need to make sure that the channel you're using includes that resource in the proper context (Summary tab, Set Dependencies, Library Resources). If you're using a custom library in the global scripts not tied to any channel, there is an option for that on the Directory Resource settings page.

All those settings are set as expected. This is not the only library we are using and is not the only function from the library. This library is a class that has around 5 functions. So far we are using just one function. Now I want to use another function from the same jar/class. That function was added today and I just replaced the jar and clicked the reload. I have done that several times now and still can't see the new function.l

[narupley]

Hmm I just tested it out and it appears to work fine for me. I tested using a custom JAR and a channel invoking it in a script, and then dropped a new version of the JAR into the directory. After reloading the resource the next message that flowed through the channel automatically used the new version of the JAR without needing to do anything else (no restarting or redeploying).

[redeemefy]

Hmm I just tested it out and it appears to work fine for me. I tested using a custom JAR and a channel invoking it in a script, and then dropped a new version of the JAR into the directory. After reloading the resource the next message that flowed through the channel automatically used the new version of the JAR without needing to do anything else (no restarting or redeploying).

What version of Mirth are you using for the test?

Also, I deleted the jar from custom_lib, reload the resources, and saw that the jar is no longer there, redeployed the channel, and the functions in the channel still load from the jar that no longer exists. Witchcraft stuff man.

I'm wondering if there is a setting in Mirth that keeps custom_lib/ in memory until restarting Mirth?

[tonygermano]

@diazgilberto This could happen if you have in your mirth.properties file the setting server.includecustomlib set to true. The description in the user guide says:

Determines whether libraries in the custom-lib directory will be included on the server classpath.
To reduce potential classpath conflicts you should create Resources and use them on specific channels/connectors instead, and then set this value to false

[redeemefy]

@diazgilberto This could happen if you have in your mirth.properties file the setting server.includecustomlib set to true. The description in the user guide says:

Determines whether libraries in the custom-lib directory will be included on the server classpath.
To reduce potential classpath conflicts you should create Resources and use them on specific channels/connectors instead, and then set this value to false

I will check and let you know.

[redeemefy]

@tonygermano that did the trick. Thanks so much. One last question. In the resources UI I can't find the resource ID of my .jar. I need that to POST /server/resources/{resourceId}/_reload.

Whare I can get that ID for remote reload my resources.

[redeemefy]

{resourceId}

The {resourceId} is the name of the library