Allocate objects only when it's necessary

Closes gh-23036

Author: stsypanov

spring-jdbc/src/main/java/org/springframework/jdbc/core/simple/AbstractJdbcInsert.java

@@ -484,12 +484,12 @@ private KeyHolder executeInsertAndReturnKeyHolderInternal(final List<?> values)
 					//Get the key
 					Statement keyStmt = null;
 					ResultSet rs = null;
-					Map<String, Object> keys = new HashMap<>(2);
 					try {
 						keyStmt = con.createStatement();
 						rs = keyStmt.executeQuery(keyQuery);
 						if (rs.next()) {
 							long key = rs.getLong(1);
+							Map<String, Object> keys = new HashMap<>(2);
 							keys.put(getGeneratedKeyNames()[0], key);
 							keyHolder.getKeyList().add(keys);
 						}

spring-test/src/main/java/org/springframework/test/context/support/AbstractContextLoader.java

@@ -245,9 +245,9 @@ protected String[] generateDefaultLocations(Class<?> clazz) {
 		for (String suffix : suffixes) {
 			Assert.hasText(suffix, "Resource suffix must not be empty");
 			String resourcePath = ClassUtils.convertClassNameToResourcePath(clazz.getName()) + suffix;
-			String prefixedResourcePath = ResourceUtils.CLASSPATH_URL_PREFIX + resourcePath;
 			ClassPathResource classPathResource = new ClassPathResource(resourcePath);
 			if (classPathResource.exists()) {
+				String prefixedResourcePath = ResourceUtils.CLASSPATH_URL_PREFIX + resourcePath;
 				if (logger.isInfoEnabled()) {
 					logger.info(String.format("Detected default resource location \"%s\" for test class [%s]",
 							prefixedResourcePath, clazz.getName()));

spring-test/src/main/java/org/springframework/test/context/support/TestPropertySourceAttributes.java

@@ -156,10 +156,10 @@ public String toString() {
 	 */
 	private static String detectDefaultPropertiesFile(Class<?> testClass) {
 		String resourcePath = ClassUtils.convertClassNameToResourcePath(testClass.getName()) + ".properties";
-		String prefixedResourcePath = ResourceUtils.CLASSPATH_URL_PREFIX + resourcePath;
 		ClassPathResource classPathResource = new ClassPathResource(resourcePath);
 
 		if (classPathResource.exists()) {
+			String prefixedResourcePath = ResourceUtils.CLASSPATH_URL_PREFIX + resourcePath;
 			if (logger.isInfoEnabled()) {
 				logger.info(String.format("Detected default properties file \"%s\" for test class [%s]",
 					prefixedResourcePath, testClass.getName()));

spring-tx/src/main/java/org/springframework/transaction/support/AbstractPlatformTransactionManager.java

@@ -637,11 +637,11 @@ protected final void resume(@Nullable Object transaction, @Nullable SuspendedRes
 	private void resumeAfterBeginException(
 			Object transaction, @Nullable SuspendedResourcesHolder suspendedResources, Throwable beginEx) {
 
-		String exMessage = "Inner transaction begin exception overridden by outer transaction resume exception";
 		try {
 			resume(transaction, suspendedResources);
 		}
 		catch (RuntimeException | Error resumeEx) {
+			String exMessage = "Inner transaction begin exception overridden by outer transaction resume exception";
 			logger.error(exMessage, beginEx);
 			throw resumeEx;
 		}