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https://issues.apache.org/jira/browse/SOLR-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429458#comment-13429458
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Uwe Schindler commented on SOLR-1725:
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I think, this is all fine:
- Java 6 spec requires a JavaScript engine to be shipped with JDK, it is just
missing at FreeBSD's package (there is an issue open upstream). If JavaScript
is not there for Java 6 it is like missing UTF8 charset :-)
- I strongly -1 shipping with additional scripting engines. No need for that.
If user Foo wants to script Solr with engine Bar, he can add the SPI Jar to
classpath. No need to ship. This is why SPI was invented!
We should maybe only fix Solr's classloader to be set as context classloader,
too. SPIs cannot be loaded from $SOLR_HOME/lib, because context classloader
does not see the jars. We fixed that for codecs and analyzer SPI JARs in Solr,
but the most correct solution would be to enable Solr's threads to see the
ResourceLoader as context classloader. Then you can add scripting engines, XML
parsers, charset providers, locales,... just like plugins or codecs or
analyzerfactories into the Solr home's lib folder without adding to WAR.
> Script based UpdateRequestProcessorFactory
> ------------------------------------------
>
> Key: SOLR-1725
> URL: https://issues.apache.org/jira/browse/SOLR-1725
> Project: Solr
> Issue Type: New Feature
> Components: update
> Affects Versions: 1.4
> Reporter: Uri Boness
> Priority: Critical
> Labels: UpdateProcessor
> Fix For: 4.0
>
> Attachments: SOLR-1725-rev1.patch, SOLR-1725.patch, SOLR-1725.patch,
> SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
> SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch,
> SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch, SOLR-1725.patch
>
>
> A script based UpdateRequestProcessorFactory (Uses JDK6 script engine
> support). The main goal of this plugin is to be able to configure/write
> update processors without the need to write and package Java code.
> The update request processor factory enables writing update processors in
> scripts located in {{solr.solr.home}} directory. The functory accepts one
> (mandatory) configuration parameter named {{scripts}} which accepts a
> comma-separated list of file names. It will look for these files under the
> {{conf}} directory in solr home. When multiple scripts are defined, their
> execution order is defined by the lexicographical order of the script file
> name (so {{scriptA.js}} will be executed before {{scriptB.js}}).
> The script language is resolved based on the script file extension (that is,
> a *.js files will be treated as a JavaScript script), therefore an extension
> is mandatory.
> Each script file is expected to have one or more methods with the same
> signature as the methods in the {{UpdateRequestProcessor}} interface. It is
> *not* required to define all methods, only those hat are required by the
> processing logic.
> The following variables are define as global variables for each script:
> * {{req}} - The SolrQueryRequest
> * {{rsp}}- The SolrQueryResponse
> * {{logger}} - A logger that can be used for logging purposes in the script
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