JtaTransactionManagerFactoryBean fully initializes its JTM instance

Closes gh-22605

spring-tx/src/main/java/org/springframework/transaction/config/JtaTransactionManagerFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -18,7 +18,9 @@ package org.springframework.transaction.config;
 
 import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.FactoryBean;
+import org.springframework.beans.factory.InitializingBean;
 import org.springframework.lang.Nullable;
+import org.springframework.transaction.TransactionSystemException;
 import org.springframework.transaction.jta.JtaTransactionManager;
 import org.springframework.util.ClassUtils;
 
@@ -32,7 +34,7 @@ import org.springframework.util.ClassUtils;
  * @see org.springframework.transaction.jta.WebLogicJtaTransactionManager
  * @see org.springframework.transaction.jta.WebSphereUowTransactionManager
  */
-public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransactionManager> {
+public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransactionManager>, InitializingBean {
 
 	private static final String WEBLOGIC_JTA_TRANSACTION_MANAGER_CLASS_NAME =
 			"org.springframework.transaction.jta.WebLogicJtaTransactionManager";
@@ -55,7 +57,6 @@ public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransact
 	}
 
 
-	@Nullable
 	private final JtaTransactionManager transactionManager;
 
 
@@ -73,6 +74,11 @@ public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransact
 	}
 
 
+	@Override
+	public void afterPropertiesSet() throws TransactionSystemException {
+		this.transactionManager.afterPropertiesSet();
+	}
+
 	@Override
 	@Nullable
 	public JtaTransactionManager getObject() {
@@ -81,7 +87,7 @@ public class JtaTransactionManagerFactoryBean implements FactoryBean<JtaTransact
 
 	@Override
 	public Class<?> getObjectType() {
-		return (this.transactionManager != null ? this.transactionManager.getClass() : JtaTransactionManager.class);
+		return this.transactionManager.getClass();
 	}
 
 	@Override