fix for

"org.apache.solr.core.SolrCore Too many close [count:-1] on
org.apache.solr.core.SolrCore@51af7c57"
-error

source/net/yacy/cora/federate/solr/connector/CachedSolrConnector.java

@@ -74,6 +74,10 @@ public class CachedSolrConnector extends AbstractSolrConnector implements SolrCo
         if (this.solr != null) this.solr.commit(true);
     }
     
+    protected void finalize() throws Throwable {
+        this.close();
+    }
+
     @Override
     public synchronized void close() {
         this.clearCaches();

source/net/yacy/cora/federate/solr/connector/EmbeddedSolrConnector.java

@@ -142,11 +142,17 @@ public class EmbeddedSolrConnector extends SolrServerConnector implements SolrCo
         return this.core.getSolrConfig();
     }
     
+    protected void finalize() throws Throwable {
+        this.close();
+    }
+
     @Override
     public synchronized void close() {
-        try {this.commit(false);} catch (final Throwable e) {ConcurrentLog.logException(e);}
+        if (this.core != null && !this.core.isClosed()) try {this.commit(false);} catch (final Throwable e) {ConcurrentLog.logException(e);}
         try {super.close();} catch (final Throwable e) {ConcurrentLog.logException(e);}
-        try {this.core.close();} catch (final Throwable e) {ConcurrentLog.logException(e);}
+        // we do NOT close the core here because that is closed if the enclosing instance is closed
+        // do NOT uncomment the following line, which caused a "org.apache.solr.core.SolrCore Too many close [count:-1] on org.apache.solr.core.SolrCore@51af7c57" error
+        // try {this.core.close();} catch (final Throwable e) {ConcurrentLog.logException(e);}
     }
 
     @Override

source/net/yacy/cora/federate/solr/instance/EmbeddedInstance.java

@@ -206,9 +206,16 @@ public class EmbeddedInstance implements SolrInstance {
         return c;
     }
     
+    protected void finalize() throws Throwable {
+        this.close();
+    }
+
     @Override
     public synchronized void close() {
-        try {this.coreContainer.shutdown();} catch (final Throwable e) {ConcurrentLog.logException(e);}
+        if (this.coreContainer != null) try {
+            this.coreContainer.shutdown();
+            this.coreContainer = null;
+        } catch (final Throwable e) {ConcurrentLog.logException(e);}
     }
     
 }