Fix exception for unlinked files

src/test/java/org/jabref/logic/xmp/XmpUtilReaderTest.java

@@ -1,6 +1,8 @@
 package org.jabref.logic.xmp;
 
 import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
 import java.net.URISyntaxException;
 import java.nio.charset.StandardCharsets;
 import java.nio.file.Path;
@@ -17,6 +19,7 @@
 import org.jabref.model.util.DummyFileUpdateMonitor;
 
 import com.google.common.io.Resources;
+import org.apache.pdfbox.pdmodel.PDDocument;
 import org.apache.xmpbox.XMPMetadata;
 import org.apache.xmpbox.schema.DublinCoreSchema;
 import org.junit.jupiter.api.BeforeEach;
@@ -109,4 +112,16 @@ void testReadPDMetadata() throws IOException, URISyntaxException, ParseException
 
  assertEquals(entryFromBibFile.get(), entries.get(0));
  }
+
+ /**
+ * Tests an pdf file with metadata which has no description section.
+ */
+ @Test
+ void testGetXmpMetadataWithNoDescription() throws IOException, URISyntaxException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {
+ Method method = XmpUtilReader.class.getDeclaredMethod("getXmpMetadata", PDDocument.class);
+ method.setAccessible(true);
+ List<XMPMetadata> entries = (List<XMPMetadata>) method.invoke(XmpUtilReader.class, PDDocument.load(XmpUtilShared.class.getResource("no_description_metadata.pdf").openStream()));
+ method.setAccessible(false);
+ assertEquals(Collections.emptyList(), entries);
+ }
 }