--- /dev/null
+package org.apache.poi.xssf.usermodel;
+
+import org.apache.poi.ss.usermodel.CellType;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class TestFormulaEval {
+ @Test
+ void testCircularRef() throws IOException {
+ try (XSSFWorkbook wb = new XSSFWorkbook()) {
+ XSSFSheet sheet = wb.createSheet();
+ XSSFRow row = sheet.createRow(0);
+ XSSFCell cell = row.createCell(0);
+ cell.setCellFormula("A1");
+ XSSFFormulaEvaluator formulaEvaluator = wb.getCreationHelper().createFormulaEvaluator();
+ // the following assert should probably be NUMERIC not ERROR (from testing in Excel itself)
+ assertEquals(CellType.ERROR, formulaEvaluator.evaluateFormulaCell(cell));
+
+ cell.setCellFormula(null);
+ formulaEvaluator.notifyUpdateCell(cell);
+ //the following assert should probably be BLANK not ERROR
+ assertEquals(CellType.ERROR, cell.getCellType());
+ }
+ }
+}
--- /dev/null
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ====================================================================
+ */
+
+package org.apache.poi.ss.formula;
+
+import org.apache.poi.hssf.usermodel.HSSFCell;
+import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
+import org.apache.poi.hssf.usermodel.HSSFRow;
+import org.apache.poi.hssf.usermodel.HSSFSheet;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.CellType;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class TestFormulaEval {
+
+ @Disabled("https://bz.apache.org/bugzilla/show_bug.cgi?id=65939")
+ @Test
+ void testCircularRef() throws IOException {
+ try (HSSFWorkbook wb = new HSSFWorkbook()) {
+ HSSFSheet sheet = wb.createSheet();
+ HSSFRow row = sheet.createRow(0);
+ HSSFCell cell = row.createCell(0);
+ cell.setCellFormula("A1");
+ HSSFFormulaEvaluator formulaEvaluator = wb.getCreationHelper().createFormulaEvaluator();
+ // the following assert should probably be NUMERIC not ERROR (from testing in Excel itself)
+ assertEquals(CellType.ERROR, formulaEvaluator.evaluateFormulaCell(cell));
+
+ cell.setCellFormula(null); //this line fails
+ formulaEvaluator.notifyUpdateCell(cell);
+ }
+ }
+}