Use SQLExceptionSubclassTranslator by default (avoiding sql-error-codes.xml)

SQLErrorCodeSQLExceptionTranslator kicks in for user-provided sql-error-codes.xml files. It will still pick up Spring's legacy default error code mappings as well but only when triggered by a (potentially empty) user-provided file in the root of the classpath.

Closes gh-28216

spring-jdbc/src/main/java/org/springframework/jdbc/support/JdbcAccessor.java

@@ -22,7 +22,6 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
 import org.springframework.beans.factory.InitializingBean;
-import org.springframework.core.SpringProperties;
 import org.springframework.lang.Nullable;
 import org.springframework.util.Assert;
 
@@ -41,13 +40,6 @@ import org.springframework.util.Assert;
  */
 public abstract class JdbcAccessor implements InitializingBean {
 
-	/**
-	 * Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
-	 * ignore XML, i.e. to not initialize the XML-related infrastructure.
-	 * <p>The default is "false".
-	 */
-	private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");
-
 	/** Logger available to subclasses. */
 	protected final Log logger = LogFactory.getLog(getClass());
 
@@ -96,9 +88,12 @@ public abstract class JdbcAccessor implements InitializingBean {
 	 * @see java.sql.DatabaseMetaData#getDatabaseProductName()
 	 */
 	public void setDatabaseProductName(String dbName) {
-		if (!shouldIgnoreXml) {
+		if (SQLErrorCodeSQLExceptionTranslator.hasUserProvidedErrorCodesFile()) {
 			this.exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(dbName);
 		}
+		else {
+			this.exceptionTranslator = new SQLExceptionSubclassTranslator();
+		}
 	}
 
 	/**
@@ -128,15 +123,11 @@ public abstract class JdbcAccessor implements InitializingBean {
 		synchronized (this) {
 			exceptionTranslator = this.exceptionTranslator;
 			if (exceptionTranslator == null) {
-				DataSource dataSource = getDataSource();
-				if (shouldIgnoreXml) {
-					exceptionTranslator = new SQLExceptionSubclassTranslator();
-				}
-				else if (dataSource != null) {
-					exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(dataSource);
+				if (SQLErrorCodeSQLExceptionTranslator.hasUserProvidedErrorCodesFile()) {
+					exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(obtainDataSource());
 				}
 				else {
-					exceptionTranslator = new SQLStateSQLExceptionTranslator();
+					exceptionTranslator = new SQLExceptionSubclassTranslator();
 				}
 				this.exceptionTranslator = exceptionTranslator;
 			}

spring-jdbc/src/main/java/org/springframework/jdbc/support/JdbcTransactionManager.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -20,7 +20,6 @@ import java.sql.SQLException;
 
 import javax.sql.DataSource;
 
-import org.springframework.core.SpringProperties;
 import org.springframework.dao.DataAccessException;
 import org.springframework.jdbc.datasource.DataSourceTransactionManager;
 import org.springframework.lang.Nullable;
@@ -53,14 +52,6 @@ import org.springframework.lang.Nullable;
 @SuppressWarnings("serial")
 public class JdbcTransactionManager extends DataSourceTransactionManager {
 
-	/**
-	 * Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
-	 * ignore XML, i.e. to not initialize the XML-related infrastructure.
-	 * <p>The default is "false".
-	 */
-	private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");
-
-
 	@Nullable
 	private volatile SQLExceptionTranslator exceptionTranslator;
 
@@ -97,9 +88,12 @@ public class JdbcTransactionManager extends DataSourceTransactionManager {
 	 * @see java.sql.DatabaseMetaData#getDatabaseProductName()
 	 */
 	public void setDatabaseProductName(String dbName) {
-		if (!shouldIgnoreXml) {
+		if (SQLErrorCodeSQLExceptionTranslator.hasUserProvidedErrorCodesFile()) {
 			this.exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(dbName);
 		}
+		else {
+			this.exceptionTranslator = new SQLExceptionSubclassTranslator();
+		}
 	}
 
 	/**
@@ -128,11 +122,11 @@ public class JdbcTransactionManager extends DataSourceTransactionManager {
 		synchronized (this) {
 			exceptionTranslator = this.exceptionTranslator;
 			if (exceptionTranslator == null) {
-				if (shouldIgnoreXml) {
-					exceptionTranslator = new SQLExceptionSubclassTranslator();
+				if (SQLErrorCodeSQLExceptionTranslator.hasUserProvidedErrorCodesFile()) {
+					exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(obtainDataSource());
 				}
 				else {
-					exceptionTranslator = new SQLErrorCodeSQLExceptionTranslator(obtainDataSource());
+					exceptionTranslator = new SQLExceptionSubclassTranslator();
 				}
 				this.exceptionTranslator = exceptionTranslator;
 			}

spring-jdbc/src/main/java/org/springframework/jdbc/support/SQLErrorCodeSQLExceptionTranslator.java

@@ -23,6 +23,7 @@ import java.util.Arrays;
 
 import javax.sql.DataSource;
 
+import org.springframework.core.io.ClassPathResource;
 import org.springframework.dao.CannotAcquireLockException;
 import org.springframework.dao.CannotSerializeTransactionException;
 import org.springframework.dao.DataAccessException;
@@ -417,4 +418,14 @@ public class SQLErrorCodeSQLExceptionTranslator extends AbstractFallbackSQLExcep
 		}
 	}
 
+
+	/**
+	 * Check whether there is a user-provided `sql-error-codes.xml` file
+	 * in the root of the classpath.
+	 */
+	static boolean hasUserProvidedErrorCodesFile() {
+		return new ClassPathResource(SQLErrorCodesFactory.SQL_ERROR_CODE_OVERRIDE_PATH,
+				SQLErrorCodesFactory.class.getClassLoader()).exists();
+	}
+
 }

spring-jdbc/src/main/java/org/springframework/jdbc/support/SQLErrorCodesFactory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2020 the original author or authors.
+ * Copyright 2002-2022 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.
@@ -28,6 +28,7 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.beans.BeansException;
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
+import org.springframework.core.SpringProperties;
 import org.springframework.core.io.ClassPathResource;
 import org.springframework.core.io.Resource;
 import org.springframework.lang.Nullable;
@@ -66,6 +67,13 @@ public class SQLErrorCodesFactory {
 
 	private static final Log logger = LogFactory.getLog(SQLErrorCodesFactory.class);
 
+	/**
+	 * Boolean flag controlled by a {@code spring.xml.ignore} system property that instructs Spring to
+	 * ignore XML, i.e. to not initialize the XML-related infrastructure.
+	 * <p>The default is "false".
+	 */
+	private static final boolean shouldIgnoreXml = SpringProperties.getFlag("spring.xml.ignore");
+
 	/**
 	 * Keep track of a single instance so we can return it to classes that request it.
 	 */
@@ -101,6 +109,10 @@ public class SQLErrorCodesFactory {
 	 * @see #loadResource(String)
 	 */
 	protected SQLErrorCodesFactory() {
+		if (shouldIgnoreXml) {
+			throw new UnsupportedOperationException("XML support disabled");
+		}
+
 		Map<String, SQLErrorCodes> errorCodes;
 
 		try {

spring-jdbc/src/test/java/org/springframework/jdbc/core/JdbcTemplateTests.java

@@ -944,6 +944,8 @@ public class JdbcTemplateTests {
 		mockDatabaseMetaData(false);
 		given(this.connection.createStatement()).willReturn(this.preparedStatement);
 
+		this.template.setExceptionTranslator(new SQLErrorCodeSQLExceptionTranslator(this.dataSource));
+
 		assertThatExceptionOfType(BadSqlGrammarException.class).isThrownBy(() ->
 				this.template.query(sql, (RowCallbackHandler) rs -> {
 					throw sqlException;
@@ -955,20 +957,17 @@ public class JdbcTemplateTests {
 	}
 
 	@Test
-	public void testSQLErrorCodeTranslationWithSpecifiedDbName() throws Exception {
+	public void testSQLErrorCodeTranslationWithSpecifiedDatabaseName() throws Exception {
 		final SQLException sqlException = new SQLException("I have a known problem", "99999", 1054);
 		final String sql = "SELECT ID FROM CUSTOMER";
 
 		given(this.resultSet.next()).willReturn(true);
 		given(this.connection.createStatement()).willReturn(this.preparedStatement);
 
-		JdbcTemplate template = new JdbcTemplate();
-		template.setDataSource(this.dataSource);
-		template.setDatabaseProductName("MySQL");
-		template.afterPropertiesSet();
+		this.template.setExceptionTranslator(new SQLErrorCodeSQLExceptionTranslator("MySQL"));
 
 		assertThatExceptionOfType(BadSqlGrammarException.class).isThrownBy(() ->
-				template.query(sql, (RowCallbackHandler) rs -> {
+				this.template.query(sql, (RowCallbackHandler) rs -> {
 					throw sqlException;
 				}))
 			.withCause(sqlException);
@@ -983,7 +982,7 @@ public class JdbcTemplateTests {
 	 * to get the metadata
 	 */
 	@Test
-	public void testUseCustomSQLErrorCodeTranslator() throws Exception {
+	public void testUseCustomExceptionTranslator() throws Exception {
 		// Bad SQL state
 		final SQLException sqlException = new SQLException("I have a known problem", "07000", 1054);
 		final String sql = "SELECT ID FROM CUSTOMER";