Fixed an issue with a statement with no preceding text node

Author: harawata

src/main/java/org/apache/ibatis/scripting/xmltags/DynamicContext.java

@@ -91,16 +91,21 @@ public String getSql() {
     return sqlBuilder.toString().trim();
   }
 
+  private void initTokenParser(List<ParameterMapping> parameterMappings) {
+    if (tokenParser == null) {
+      tokenHandler = new ParameterMappingTokenHandler(parameterMappings, configuration, parameterObject, parameterType,
+          bindings, paramExists);
+      tokenParser = new GenericTokenParser("#{", "}", tokenHandler);
+    }
+  }
+
   public List<ParameterMapping> getParameterMappings() {
+    initTokenParser(new ArrayList<>());
     return tokenHandler == null ? new ArrayList<>() : tokenHandler.getParameterMappings();
   }
 
   protected String parseParam(String sql) {
-    if (tokenParser == null) {
-      tokenHandler = new ParameterMappingTokenHandler(getParameterMappings(), configuration, parameterObject,
-          parameterType, bindings, paramExists);
-      tokenParser = new GenericTokenParser("#{", "}", tokenHandler);
-    }
+    initTokenParser(getParameterMappings());
     return tokenParser.parse(sql);
   }
 

src/test/java/org/apache/ibatis/builder/xml/dynamic/DynamicSqlSourceTest.java

@@ -343,6 +343,21 @@ void shouldPerformStrictMatchOnForEachVariableSubstitution() throws Exception {
     assertEquals("u", boundSql.getParameterMappings().get(3).getProperty());
   }
 
+  @Test
+  void cornerCase_ForeachComesFirst() throws Exception {
+    final Map<String, Object> param = new HashMap<>();
+    List<Bean> beans = new ArrayList<>();
+    beans.add(new Bean("bean id 1"));
+    beans.add(new Bean("bean id 2"));
+    param.put("beans", beans);
+    DynamicSqlSource source = createDynamicSqlSource(new ForEachSqlNode(new Configuration(),
+        mixedContents(new TextSqlNode("#{b.id}")), "beans", false, null, "b", "(", ")", ","));
+    BoundSql boundSql = source.getBoundSql(param);
+    assertEquals(2, boundSql.getParameterMappings().size());
+    assertEquals("b.id", boundSql.getParameterMappings().get(0).getProperty());
+    assertEquals("b.id", boundSql.getParameterMappings().get(1).getProperty());
+  }
+
   private DynamicSqlSource createDynamicSqlSource(SqlNode... contents) throws IOException, SQLException {
     createBlogDataSource();
     final String resource = "org/apache/ibatis/builder/MapperConfig.xml";