GH-2888 - Fix eager PlatformTransactionManager dependency.

Closes #2888

Author: meistermeier

src/main/java/org/springframework/data/neo4j/core/Neo4jTemplate.java

@@ -90,6 +90,7 @@
 import org.springframework.data.neo4j.core.mapping.SpringDataCypherDsl;
 import org.springframework.data.neo4j.core.mapping.callback.EventSupport;
 import org.springframework.data.neo4j.core.schema.TargetNode;
+import org.springframework.data.neo4j.core.transaction.Neo4jTransactionManager;
 import org.springframework.data.neo4j.repository.NoResultException;
 import org.springframework.data.neo4j.repository.query.QueryFragments;
 import org.springframework.data.neo4j.repository.query.QueryFragmentsAndParameters;
@@ -1100,8 +1101,10 @@ public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
 		this.renderer = Renderer.getRenderer(cypherDslConfiguration);
 		this.elementIdOrIdFunction = SpringDataCypherDsl.elementIdOrIdFunction.apply(cypherDslConfiguration.getDialect());
 		this.cypherGenerator.setElementIdOrIdFunction(elementIdOrIdFunction);
-		this.transactionTemplate = new TransactionTemplate(beanFactory.getBean(PlatformTransactionManager.class));
-		this.transactionTemplateReadOnly = new TransactionTemplate(beanFactory.getBean(PlatformTransactionManager.class), readOnlyTransactionDefinition);
+
+		PlatformTransactionManager transactionManager = beanFactory.getBeanProvider(PlatformTransactionManager.class).getIfUnique(() -> beanFactory.getBean(Neo4jTransactionManager.class));
+		this.transactionTemplate = new TransactionTemplate(transactionManager);
+		this.transactionTemplateReadOnly = new TransactionTemplate(transactionManager, readOnlyTransactionDefinition);
 	}
 
 	// only used for the CDI configuration

src/main/java/org/springframework/data/neo4j/core/ReactiveNeo4jTemplate.java

@@ -67,6 +67,7 @@
 import org.springframework.data.neo4j.core.mapping.SpringDataCypherDsl;
 import org.springframework.data.neo4j.core.mapping.callback.ReactiveEventSupport;
 import org.springframework.data.neo4j.core.schema.TargetNode;
+import org.springframework.data.neo4j.core.transaction.ReactiveNeo4jTransactionManager;
 import org.springframework.data.neo4j.repository.query.QueryFragments;
 import org.springframework.data.neo4j.repository.query.QueryFragmentsAndParameters;
 import org.springframework.data.projection.ProjectionFactory;
@@ -1181,8 +1182,10 @@ public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
 		this.renderer = Renderer.getRenderer(cypherDslConfiguration);
 		this.elementIdOrIdFunction = SpringDataCypherDsl.elementIdOrIdFunction.apply(cypherDslConfiguration.getDialect());
 		this.cypherGenerator.setElementIdOrIdFunction(elementIdOrIdFunction);
-		this.transactionalOperatorReadOnly = TransactionalOperator.create(beanFactory.getBean(ReactiveTransactionManager.class), readOnlyTransactionDefinition);
-		this.transactionalOperator = TransactionalOperator.create(beanFactory.getBean(ReactiveTransactionManager.class));
+		ReactiveTransactionManager reactiveTransactionManager = beanFactory.getBeanProvider(ReactiveTransactionManager.class)
+				.getIfUnique(() -> beanFactory.getBean(ReactiveNeo4jTransactionManager.class));
+		this.transactionalOperatorReadOnly = TransactionalOperator.create(reactiveTransactionManager, readOnlyTransactionDefinition);
+		this.transactionalOperator = TransactionalOperator.create(reactiveTransactionManager);
 	}
 
 	@Override