RED-10365: InvisibleElementRemovalService crashes for specific file

build.gradle.kts

@@ -27,7 +27,7 @@ repositories {
 dependencies {
     api("org.projectlombok:lombok:1.18.30")
     api("com.google.guava:guava:33.0.0-jre")
-    api("com.pdftron:PDFNet:10.11.0")
+    api("com.pdftron:PDFNet:11.0.0")
     testImplementation("net.sourceforge.lept4j:lept4j:1.19.1")
     testImplementation("org.junit.jupiter:junit-jupiter:5.10.2")
     testImplementation("org.assertj:assertj-core:3.24.2")

src/main/java/com/iqser/red/pdftronlogic/commons/InvisibleElementRemovalService.java

@@ -290,7 +290,8 @@ public class InvisibleElementRemovalService {
                 Therefore, the position of a following Tj is affected by not writing the first Element.
                 This is why, we write only the Tm command:
                 */
-                    writer.writeGStateChanges(textElement);
+                    textElement.setTextData(new byte[]{});
+                    writer.writeElement(textElement);
                 }
             } else {
                 if (!inClippingPath) {
@@ -431,7 +432,7 @@ public class InvisibleElementRemovalService {
         context.reader().end();
 
         if (!context.overlappedElements().isEmpty()) {
-            log.warn(context.overlappedElements().size() + " overlapped elements have not been found or removed");
+            log.debug(context.overlappedElements().size() + " overlapped elements have not been found or removed");
         }
     }
 
@@ -490,7 +491,8 @@ public class InvisibleElementRemovalService {
                 Therefore, the position of a following Tj is affected by not writing the first Element.
                 This is why, we write only the Tm command:
                 */
-                writer.writeGStateChanges(element);
+                element.setTextData(new byte[]{});
+                writer.writeElement(element);
             }
         } else {
             writer.writeElement(element);

src/test/java/com/iqser/red/pdftronlogic/commons/InvisibleElementRemovalServiceTest.java

@@ -3,6 +3,7 @@ package com.iqser.red.pdftronlogic.commons;
 import static com.iqser.red.pdftronlogic.commons.PdfTextExtraction.extractAllTextFromDocument;
 import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
 
+import java.io.ByteArrayOutputStream;
 import java.io.FileInputStream;
 import java.io.FileOutputStream;
 
@@ -64,6 +65,19 @@ class InvisibleElementRemovalServiceTest {
     }
 
 
+    @Test
+    @SneakyThrows
+    void page32DoesNotCrash() {
+
+        String fileName = "files/Page32.pdf";
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new ByteArrayOutputStream()) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, false);
+        }
+
+    }
+
+
     @Test
     @SneakyThrows
     void removeInvisibleTextClippedByFormObjects() {