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From "Uwe Schindler" <>
Subject RE: SPI class of type org.apache.lucene.codecs.Codec error
Date Fri, 16 Aug 2013 15:52:45 GMT

Maven makes it even simplier to handle this! The problem may be (I am not sure not sure, because
I don’t know your setup):
It seems that you are using the Maven Shade Plugin to merge all JAR files into one BIG JAR
file. During this step, you may be missing to merge all the data correctly in your JAR files.
Lucene JARs also contain metadata and other resources (in addition to class files) in the
META-INF folders and those are generally not always merged by all those tools, so those must
be copied and merged if multiple META-INF/services with same name exist. The Maven-Shade-Plugin
can do this for you, see:

It is recommended to use the ServicesResourceTransformer option.

Ideally, you should not change or transform JAR files of Lucene at all and not merge them,
just ship them with your project as is. Please keep them separate, only for special use cases
like autostarting double-click JAR files, merge them otherwise management gets crazy.

In any case, please check your classpath:
- Are the *unmodified* lucene-core.jar files in it?
- Don't use crazy classloader hierarchies. Keep all Lucene code together in one classloader
(so don't place Lucene JAR files outside your webapp, but the code using lucene inside a webapp).
- If you create uber-JARS (which is a bad idea in general), use Maven-Shade plugin and configure
it correctly. The Uber-JAR file must contain a "META-INF/services" folder with some org.apache.lucene.index.*

Uwe Schindler
H.-H.-Meier-Allee 63, D-28213 Bremen

> -----Original Message-----
> From: Amal Kammoun []
> Sent: Friday, August 16, 2013 5:39 PM
> To:
> Subject: SPI class of type org.apache.lucene.codecs.Codec error
> Hi,
> We are working on a project which uses Lucene 4.2.1. Actually we are facing
> an error message "java.lang.
> ExceptionInInitializerError". We are using Maven for assembling the project
> and we have a dependency between two projects. When we do the test
> with eclipse it works fine. However, when we incorporate our jar in a client
> that is tested outside Eclipse we got the java.lang.ExceptionInInitializerError.
> We are doing workaround to overcome the issue since yesterday, we got the
> same issue with both versions of Lucene 4.2.0 and 4.2.1.
> Have you ever experienced such an issue with maven? Are the newer
> Lucene versions safer from such an issue?
> Here is the rest of the message error
> Caused by: java.lang.
> IllegalArgumentException: A SPI class of type
> org.apache.lucene.codecs.Codec with name 'Lucene42' does not exist. You
> need to add the corresponding JAR file supporting this SPI to your
> classpath.The current classpath supports the following names.
> Thank you a lot in advance for your support.
> Best regards,

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