On 11/3/2015 3:33 PM, Erick Erickson wrote: > You're on your one if you try to do this. Solr 4.10 requires Java7. I > don't believe Solr will even compile under 1.6. > > You may bet lucky and get SolrJ to compile, but whether it works or > not is chancy at best. > > Best, > Erick > > On Tue, Nov 3, 2015 at 2:13 PM, O. Olson <olson_...@yahoo.it> wrote: >> Hi, >> I'm looking to compile the SolrJ for Solr 4.10.3 for running on Java 6. >> (Due to choices beyond my control, we are on this older version of SolrJ and >> Java 6.) I'm looking for any pointers on how I could do it?
Erick is right. It won't even compile. When the jump to Java 7 was made between the 4.7 and 4.8 releases, most of the source code was reviewed and certain pieces in a very large number of files were updated to code that only compiles in Java 7. Many of those changes happened in SolrJ. This was done because the Java 7 code is generally more reliable and easier to maintain. Here's what happens when I import the 4.10 branch into eclipse and change the compiler compliance level to 1.6. Notice the large number of red marks that are on source packages and java files: https://www.dropbox.com/s/kktym6tsdi3iu36/solrj-4.10-java6-errors.png?dl=0 Your best bet is to download the 4.7 version and try to use that. This is the last release that will work in Java 6: http://archive.apache.org/dist/lucene/solr/4.7.2/ If you're NOT running SolrCloud, chances are VERY good that you can get this to work with zero problems. If you're running SolrCloud on version 4.10 and try to use SolrJ 4.7, I would not be surprised to learn that they are not compatible. It might work well ... I have never tried it. The nature of the changes for Java 7 are such that it will be extremely time-consuming to backport changes between 4.7.2 and 4.10.4 to the older source code. Thanks, Shawn
