Fix NullPointerException in Autosize introduced via #64981

Only happened when alignment is set
Add a test reproducing the problem
Also verify auto-size on SXSSF

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1884653 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFCellStyle.java

@@ -592,7 +592,7 @@ public class XSSFCellStyle implements CellStyle, Duplicatable {
     @Override
     public short getRotation() {
         CTCellAlignment align = _cellXf.getAlignment();
-        return align == null ? 0 : align.getTextRotation().shortValue();
+        return align == null || align.getTextRotation() == null ? 0 : align.getTextRotation().shortValue();
     }
 
     @Override

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestSXSSFSheetAutosizeColumn.java

@@ -0,0 +1,39 @@
+/* ====================================================================
+   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.xssf.usermodel;
+
+import org.apache.poi.ss.usermodel.BaseTestSheetAutosizeColumn;
+import org.apache.poi.ss.usermodel.Sheet;
+import org.apache.poi.ss.usermodel.Workbook;
+import org.apache.poi.xssf.SXSSFITestDataProvider;
+import org.apache.poi.xssf.streaming.SXSSFSheet;
+
+/**
+ * @author Yegor Kozlov
+ */
+public final class TestSXSSFSheetAutosizeColumn extends BaseTestSheetAutosizeColumn {
+
+    public TestSXSSFSheetAutosizeColumn(){
+        super(SXSSFITestDataProvider.instance);
+    }
+
+    @Override
+    protected void trackColumnsForAutoSizingIfSXSSF(Sheet sheet) {
+        ((SXSSFSheet)sheet).trackAllColumnsForAutoSizing();
+    }
+}

src/testcases/org/apache/poi/ss/usermodel/BaseTestSheetAutosizeColumn.java

@@ -21,6 +21,7 @@ import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 
 import java.util.Calendar;
+import java.util.Date;
 import java.util.Locale;
 
 import org.apache.poi.ss.ITestDataProvider;
@@ -341,4 +342,22 @@ public abstract class BaseTestSheetAutosizeColumn {
             }
         }
     }
+
+
+    @Test
+    public void testExcelExporter() {
+        final Workbook wb = _testDataProvider.createWorkbook();
+        final Sheet sheet = wb.createSheet("test");
+        trackColumnsForAutoSizingIfSXSSF(sheet);
+        final Row row = sheet.createRow(0);
+        final Cell cell = row.createCell(0);
+
+        CellStyle csDateTime = wb.createCellStyle();
+        csDateTime.setAlignment(HorizontalAlignment.LEFT);
+
+        cell.setCellValue(new Date(Long.parseLong("1439800763994")));
+        cell.setCellStyle(csDateTime);
+
+        sheet.autoSizeColumn(0);
+    }
 }