Failed to install jts library on Solr 6.4.2 - solr

Question

I just installed Solr-6.4.2 and tried to install the JTS library like here explained by copying all JTS library files to the /solr-6.4.2/server/solr-webapp/WEB-INF/lib directory.
Then configured the managed-schema by adding
<fieldType name="location_rpt" class="solr.SpatialRecursivePrefixTreeFieldType"
spatialContextFactory="com.spatial4j.core.context.jts.JtsSpatialContextFactory"
distErrPct="0.025"
maxDistErr="0.000009"
units="degrees"
/>
<field name="geo" type="location_rpt" indexed="true" stored="true" multiValued="true" />
and started it in /bin with ./solr start (jetty)
But when i visit the solr interface it says:
> org.apache.solr.common.SolrException:org.apache.solr.common.SolrException:
> Could not load conf for core polygon: Can't load schema
> /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema:
> Plugin Initializing failure for [schema.xml] fieldType
It looks to me that the library is not found or not automatically loaded (as it should be according to tutorials).
Can you help me?
Here is the log file:
2017-03-11 15:44:57.061 INFO (main) [ ] o.a.s.c.CorePropertiesLocator Cores are: [polygon]
2017-03-11 15:44:57.067 INFO (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.c.SolrResourceLoader [null] Added 8 libs to classloader, from paths: [/home/spatial/solr-6.4.2/server/solr/polygon/lib]
2017-03-11 15:44:57.117 INFO (main) [ ] o.e.j.s.Server Started #777ms
2017-03-11 15:44:57.174 INFO (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.c.SolrResourceLoader [polygon] Added 59 libs to classloader, from paths: [/home/spatial/solr-6.4.2/contrib/clustering/lib, /home/spatial/solr-6.4.2/contrib/extraction/lib, /home/spatial/solr-6.4.2/contrib/langid/lib, /home/spatial/solr-6.4.2/contrib/velocity/lib, /home/spatial/solr-6.4.2/dist]
2017-03-11 15:44:57.209 INFO (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.c.SolrConfig Using Lucene MatchVersion: 6.4.2
2017-03-11 15:44:57.298 INFO (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.s.IndexSchema [polygon] Schema name=example-data-driven-schema
2017-03-11 15:44:57.385 WARN (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.c.SolrResourceLoader Solr loaded a deprecated plugin/analysis class [solr.SynonymFilterFactory]. Please consult documentation how to replace it accordingly.
2017-03-11 15:44:57.535 WARN (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.s.AbstractSpatialFieldType Replace 'com.spatial4j.core' with 'org.locationtech.spatial4j' in your schema.
2017-03-11 15:44:57.556 ERROR (coreLoadExecutor-6-thread-1) [ x:polygon] o.a.s.c.CoreContainer Error creating core [polygon]: Could not load conf for core polygon: Can't load schema /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType
org.apache.solr.common.SolrException: Could not load conf for core polygon: Can't load schema /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.core.ConfigSetService.getConfig(ConfigSetService.java:84)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:888)
at org.apache.solr.core.CoreContainer.lambda$load$3(CoreContainer.java:542)
at com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:197)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Can't load schema /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:598)
at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:183)
at org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:104)
at org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:173)
at org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:45)
at org.apache.solr.schema.IndexSchemaFactory.buildIndexSchema(IndexSchemaFactory.java:75)
at org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:106)
at org.apache.solr.core.ConfigSetService.getConfig(ConfigSetService.java:78)
... 8 more
Caused by: org.apache.solr.common.SolrException: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:194)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:491)
... 15 more
Caused by: java.lang.RuntimeException: schema fieldtype location_rpt(org.apache.solr.schema.SpatialRecursivePrefixTreeFieldType) invalid arguments:{units=degrees}
at org.apache.solr.schema.FieldType.setArgs(FieldType.java:202)
at org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:165)
at org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:53)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:191)
... 16 more
2017-03-11 15:44:57.558 ERROR (coreContainerWorkExecutor-2-thread-1) [ ] o.a.s.c.CoreContainer Error waiting for SolrCore to be created
java.util.concurrent.ExecutionException: org.apache.solr.common.SolrException: Unable to create core [polygon]
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at org.apache.solr.core.CoreContainer.lambda$load$4(CoreContainer.java:570)
at com.codahale.metrics.InstrumentedExecutorService$InstrumentedRunnable.run(InstrumentedExecutorService.java:176)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: Unable to create core [polygon]
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:903)
at org.apache.solr.core.CoreContainer.lambda$load$3(CoreContainer.java:542)
at com.codahale.metrics.InstrumentedExecutorService$InstrumentedCallable.call(InstrumentedExecutorService.java:197)
... 5 more
Caused by: org.apache.solr.common.SolrException: Could not load conf for core polygon: Can't load schema /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.core.ConfigSetService.getConfig(ConfigSetService.java:84)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:888)
... 7 more
Caused by: org.apache.solr.common.SolrException: Can't load schema /home/spatial/solr-6.4.2/server/solr/polygon/conf/managed-schema: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:598)
at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:183)
at org.apache.solr.schema.ManagedIndexSchema.<init>(ManagedIndexSchema.java:104)
at org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:173)
at org.apache.solr.schema.ManagedIndexSchemaFactory.create(ManagedIndexSchemaFactory.java:45)
at org.apache.solr.schema.IndexSchemaFactory.buildIndexSchema(IndexSchemaFactory.java:75)
at org.apache.solr.core.ConfigSetService.createIndexSchema(ConfigSetService.java:106)
at org.apache.solr.core.ConfigSetService.getConfig(ConfigSetService.java:78)
... 8 more
Caused by: org.apache.solr.common.SolrException: Plugin Initializing failure for [schema.xml] fieldType
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:194)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:491)
... 15 more
Caused by: java.lang.RuntimeException: schema fieldtype location_rpt(org.apache.solr.schema.SpatialRecursivePrefixTreeFieldType) invalid arguments:{units=degrees}
at org.apache.solr.schema.FieldType.setArgs(FieldType.java:202)
at org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:165)
at org.apache.solr.schema.FieldTypePluginLoader.init(FieldTypePluginLoader.java:53)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:191)

Answer 1

It turned out the interface was recently changed and older examples found on stackoverflow, like here are not working with the most current solr version (6.4.2). The most current documentation is here
A configuration example which will work:
<fieldType name="location_rpt" class="solr.SpatialRecursivePrefixTreeFieldType"
spatialContextFactory="com.spatial4j.core.context.jts.JtsSpatialContextFactory"
autoIndex="true"
distErrPct="0.025"
maxDistErr="0.001"
distanceUnits="kilometers" />
I. e. distanceUnits is now used instead of units, etc. and degrees as attribute seems to raise an error.
The initial code I used raised errors in the most current solr version.
Caused by: java.lang.RuntimeException: schema fieldtype location_rpt(org.apache.solr.schema.SpatialRecursivePrefixTreeFieldType) invalid arguments:{units=degrees}