[infrastructure] move infered nullness warnings to error and update EEA (#8949)

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>

bundles/org.openhab.binding.lametrictime/src/3rdparty/java/org/openhab/binding/lametrictime/api/common/impl/typeadapters/imported/CustomizedTypeAdapterFactory.java

@@ -5,6 +5,7 @@
 package org.openhab.binding.lametrictime.api.common.impl.typeadapters.imported;
 
 import java.io.IOException;
+import java.io.ObjectStreamException;
 
 import com.google.gson.Gson;
 import com.google.gson.JsonElement;
@@ -51,6 +52,9 @@ public abstract class CustomizedTypeAdapterFactory<C> implements TypeAdapterFact
             {
                 JsonElement tree = elementAdapter.read(in);
                 afterRead(tree);
+                if (tree == null) {
+                    throw new IOException("null reader");
+                }
                 return delegate.fromJsonTree(tree);
             }
         };