SimpleSQLChecker tighten up exception handling

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

@@ -187,7 +187,7 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 								(mapper.databaseType() == defaultDatabaseType ? defaultArrayStringTypeName : mapper.databaseType().arrayStringTypeName);
 					}
 					final ArrayInList arrayInList;
-					if(sqlChecker != null) {
+					if(sqlCheckerClass != null) {
 						switch(databaseType) {
 							case ORACLE:
 								arrayInList = new OracleArrayInList(arrayNumberTypeName, arrayStringTypeName);
@@ -1230,6 +1230,8 @@ public class JdbcMapperProcessor extends AbstractProcessor {
 	}
 
 	public static String toString(final Throwable e) {
+		if (e == null)
+			return "exception object was null";
 		StringWriter sw = null;
 		PrintWriter pw = null;
 		try {

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

@@ -83,9 +83,9 @@ public class SimpleSQLChecker implements SQLChecker {
 	}
 
 	public void handleException(final Messager messager, final Exception e, final TypeElement classElement, final ExecutableElement method) {
-		if (e.getMessage().startsWith("ORA-02291: integrity constraint"))
+		if (e != null && e.getMessage() != null && e.getMessage().startsWith("ORA-02291: integrity constraint"))
 			return; // since we make up values and rollback we can ignore this, it means SQL is correct at least
-		getMessager().printMessage(Diagnostic.Kind.ERROR, e.getMessage(), method);
+		messager.printMessage(Diagnostic.Kind.ERROR, e == null || e.getMessage() == null ? JdbcMapperProcessor.toString(e) : e.getMessage(), method);
 	}
 
 	public Collection<Object> getFakeBindParams(final List<VariableElement> bindParams, final Connection conn, final ArrayInList arrayInList) throws SQLException {