Call super(Connection) if it exists, tweak cannot find Constructor error message

jdbcmapper/src/main/java/com/moparisthebest/jdbc/codegen/CompileTimeRowToObjectMapper.java

@@ -2,6 +2,7 @@ package com.moparisthebest.jdbc.codegen;
 
 import com.moparisthebest.jdbc.CompilingRowToObjectMapper;
 import com.moparisthebest.jdbc.MapperException;
+import com.moparisthebest.jdbc.RowToObjectMapper;
 import com.moparisthebest.jdbc.TypeMappingsFactory;
 
 import javax.lang.model.element.*;
@@ -95,7 +96,7 @@ public class CompileTimeRowToObjectMapper {
 				*/
 				outer:
 				for(final Element e : methodsAndConstructors) {
-					if(e.getKind() == ElementKind.CONSTRUCTOR && e.getModifiers().contains(Modifier.PUBLIC)) {
+					if(e.getKind() == ElementKind.CONSTRUCTOR && e.getModifiers().contains(Modifier.PUBLIC)) { // todo: public normally, but also package-private if same package, or protected if it's a sub-class of super...
 						final List<? extends VariableElement> params = ((ExecutableElement)e).getParameters();
 						if(params.isEmpty())
 							defaultConstructor = true;
@@ -134,7 +135,8 @@ public class CompileTimeRowToObjectMapper {
 				_fieldOrder = null; // didn't successfully finish
 			this.resultSetConstructor = resultSetConstructor;
 			if(!resultSetConstructor && !defaultConstructor && !paramConstructor && _columnCount > 2 && componentType == null)
-				throw new MapperException("Exception when trying to get constructor for : "+_returnTypeClass.toString() + " Must have default no-arg constructor or one that takes a single ResultSet.");
+				throw new MapperException("Exception when trying to get constructor for : "+_returnTypeClass.toString() + " Must have default no-arg constructor, one that takes a single ResultSet, or one that takes parameters named like the query columns (in any order):\n" +
+						RowToObjectMapper.keysToString(keys)+ "\nRequires compilation with -parameters argument if source isn't being compiled this pass, beware Bug ID: JDK-8191074 with jdk8, fixed in 9+");
 		}
 	}
 

jdbcmapper/src/main/java/com/moparisthebest/jdbc/codegen/JdbcMapperProcessor.java

@@ -15,6 +15,7 @@ import javax.tools.Diagnostic;
 import java.io.*;
 import java.sql.Blob;
 import java.sql.Clob;
+import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.*;
 import java.util.regex.Matcher;
@@ -65,7 +66,7 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 		return messager;
 	}
 
-	static TypeMirror sqlExceptionType, stringType, numberType, utilDateType, readerType, clobType, jdbcMapperType,
+	static TypeMirror sqlExceptionType, stringType, numberType, utilDateType, readerType, clobType, connectionType, jdbcMapperType,
 			byteArrayType, inputStreamType, fileType, blobType, sqlArrayType, collectionType, calendarType, cleanerType, enumType;
 	//IFJAVA8_START
 	static TypeMirror instantType, localDateTimeType, localDateType, localTimeType, zonedDateTimeType, offsetDateTimeType, offsetTimeType;
@@ -97,6 +98,7 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 		utilDateType = elements.getTypeElement(java.util.Date.class.getCanonicalName()).asType();
 		readerType = elements.getTypeElement(Reader.class.getCanonicalName()).asType();
 		clobType = elements.getTypeElement(Clob.class.getCanonicalName()).asType();
+		connectionType = elements.getTypeElement(Connection.class.getCanonicalName()).asType();
 		jdbcMapperType = elements.getTypeElement(JdbcMapper.class.getCanonicalName()).asType();
 		inputStreamType = elements.getTypeElement(InputStream.class.getCanonicalName()).asType();
 		fileType = elements.getTypeElement(File.class.getCanonicalName()).asType();
@@ -234,10 +236,19 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 							w.write(className);
 							w.write("() throws SQLException {\n\t\tthis(_conFactory);\n\t}\n");
 						}
+
+						w.write("\n\tprivate ");
+						w.write(className);
+						w.write("(final Connection conn, final boolean closeConn) {\n");
+						if(hasSuperConstructorTakesConnection(genClass))
+							w.write("\t\tsuper(conn);\n");
+						w.write("\t\tthis.conn = conn;\n\t\tthis.closeConn = closeConn;\n\t\tif (this.conn == null)\n" +
+								"\t\t\tthrow new NullPointerException(\"Connection needs to be non-null for JdbcMapper...\");\n\t}\n"
+						);
+
 						w.write("\n\tpublic ");
 						w.write(className);
-						w.write("(Connection conn) {\n\t\tthis.conn = conn;\n\t\tthis.closeConn = false;\n\t\tif (this.conn == null)\n" +
+						w.write("(Connection conn) {\n\t\tthis(conn, false);\n\t}\n" +
-								"\t\t\tthrow new NullPointerException(\"Connection needs to be non-null for JdbcMapper...\");\n\t}\n" +
 								"\n\tpublic Connection getConnection() {\n\t\treturn this.conn;\n\t}\n"
 						);
 
@@ -541,8 +552,7 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 							// and we can create constructors that set closeConn to true!
 							w.write("\n\tpublic ");
 							w.write(className);
-							w.write("(final Factory<Connection> connectionFactory) throws SQLException {\n\t\tthis.conn = connectionFactory.create();\n\t\tthis.closeConn = true;\n\t\tif (this.conn == null)\n" +
+							w.write("(final Factory<Connection> connectionFactory) throws SQLException {\n\t\tthis(connectionFactory.create(), true);\n\t}\n"
-									"\t\t\tthrow new NullPointerException(\"Connection needs to be non-null for JdbcMapper...\");\n\t}\n"
 							);
 
 							w.write("\n\tpublic ");
@@ -950,4 +960,16 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 			tryClose(pw);
 		}
 	}
+
+	public boolean hasSuperConstructorTakesConnection(final TypeElement genClass) {
+		final List<? extends Element> methodsAndConstructors = genClass.getEnclosedElements();
+		for(final Element e : methodsAndConstructors) {
+			if (e.getKind() == ElementKind.CONSTRUCTOR && !e.getModifiers().contains(Modifier.PRIVATE)) {
+				final List<? extends VariableElement> params = ((ExecutableElement)e).getParameters();
+				if(params.size() == 1 && types.isSameType(params.get(0).asType(), connectionType))
+					return true;
+			}
+		}
+		return false;
+	}
 }

querymapper/src/main/java/com/moparisthebest/jdbc/RowToObjectMapper.java

@@ -197,7 +197,11 @@ public class RowToObjectMapper<K, T> extends AbstractRowMapper<K, T> {
 					// if column count is 2 or less, it might map directly to a type like a Long or something, or be a map which does
 					// or if componentType is non-null, then we want an array like Long[] or String[]
 					if (_columnCount > 2 && componentType == null)
-						throw new MapperException("Exception when trying to get constructor for : " + _returnTypeClass.getName() + " Must have default no-arg constructor or one that takes a single ResultSet.", e1);
+						throw new MapperException("Exception when trying to get constructor for : " + _returnTypeClass.getName() + " Must have default no-arg constructor or one that takes a single ResultSet"
+								//IFJAVA8_START
+								+ ", or one that takes parameters named like the query columns (in any order):\n" + keysToString(keys) + "\nRequires compilation with -parameters argument, beware Bug ID: JDK-8191074 with jdk8, fixed in 9+"
+								//IFJAVA8_END
+								, e1);
 				}
 			}
 		}
@@ -208,6 +212,24 @@ public class RowToObjectMapper<K, T> extends AbstractRowMapper<K, T> {
 		this.constructorLoaded = true;
 	}
 
+	public static String keysToString(final String[] a) {
+		if (a == null)
+			return "null";
+
+		int iMax = a.length - 1;
+		if (iMax == 0)
+			return "[]";
+
+		StringBuilder b = new StringBuilder();
+		b.append('[');
+		for (int i = 1; ; i++) {
+			b.append(String.valueOf(a[i]));
+			if (i == iMax)
+				return b.append(']').toString();
+			b.append(", ");
+		}
+	}
+
 	/**
 	 * This returns a new instance of the Map class required by Map<String, Object>[]
 	 * It lives in it's own method to minimize suppressed warnings and allow subclasses to override methods,

readme.md

@@ -118,5 +118,6 @@ try(QueryMapper qm = new QueryMapper("java:/comp/env/jdbc/testPool", new ResultS
 TODO
 ----
 
- * Binding of Enum to String by default
+ * DOCUMENTATION!!!!!
  * sql other than select return boolean, int > 0 ?
+ * @RunInTransaction void support