[bug-62181] try to handle file where shared string loading is happening twice

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1910759 13f79535-47bb-0310-9956-ffa450edef68

poi-ooxml/src/main/java/org/apache/poi/xssf/usermodel/XSSFWorkbook.java

@@ -412,7 +412,14 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook, Date1904Su
                 if (packageReadOnly) {
                     sharedStringSource = new SharedStringsTable();
                 } else {
-                    sharedStringSource = (SharedStringsTable)createRelationship(XSSFRelation.SHARED_STRINGS, this.xssfFactory);
+                    List<PackagePart> matchingParts = getPackagePart().getPackage()
+                            .getPartsByContentType(XSSFRelation.SHARED_STRINGS.getContentType());
+                    if (matchingParts.isEmpty()) {
+                        sharedStringSource = (SharedStringsTable)
+                                createRelationship(XSSFRelation.SHARED_STRINGS, this.xssfFactory);
+                    } else {
+                        sharedStringSource = new SharedStringsTable(matchingParts.get(0));
+                    }
                 }
             }
 

poi-ooxml/src/test/java/org/apache/poi/xssf/usermodel/TestXSSFBugs.java

@@ -110,6 +110,7 @@ import org.apache.poi.xssf.XSSFITestDataProvider;
 import org.apache.poi.xssf.XSSFTestDataSamples;
 import org.apache.poi.xssf.eventusermodel.XSSFReader;
 import org.apache.poi.xssf.model.CalculationChain;
+import org.apache.poi.xssf.model.SharedStringsTable;
 import org.apache.poi.xssf.model.StylesTable;
 import org.apache.poi.xssf.streaming.SXSSFWorkbook;
 import org.apache.poi.xssf.usermodel.extensions.XSSFCellFill;
@@ -3854,6 +3855,15 @@ public final class TestXSSFBugs extends BaseTestBugzillaIssues {
         }
     }
 
+    @Test
+    void testBug62181() throws Exception {
+        try (XSSFWorkbook wb = openSampleWorkbook("bug62181.xlsx")) {
+            SharedStringsTable sst = wb.getSharedStringSource();
+            assertNotNull(sst);
+            assertEquals(0, sst.getCount());
+        }
+    }
+
     private static void readByCommonsCompress(File temp_excel_poi) throws IOException {
         /* read by commons-compress*/
         try (ZipFile zipFile = new ZipFile(temp_excel_poi)) {