[java] Add nullness for exceptions (#15081)

Co-authored-by: Diego Molina <[email protected]>

Author: mk868

java/src/org/openqa/selenium/NoSuchElementException.java

@@ -17,24 +17,28 @@
 
 package org.openqa.selenium;
 
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
 /**
  * Thrown by {@link WebDriver#findElement(By) WebDriver.findElement(By by)} and {@link
  * WebElement#findElement(By by) WebElement.findElement(By by)}.
  */
+@NullMarked
 public class NoSuchElementException extends NotFoundException {
 
   private static final String SUPPORT_URL = BASE_SUPPORT_URL + "#no-such-element-exception";
 
-  public NoSuchElementException(String reason) {
+  public NoSuchElementException(@Nullable String reason) {
     super(reason);
   }
 
-  public NoSuchElementException(String reason, Throwable cause) {
+  public NoSuchElementException(@Nullable String reason, @Nullable Throwable cause) {
     super(reason, cause);
   }
 
   @Override
-  public String getSupportUrl() {
+  public @Nullable String getSupportUrl() {
     return SUPPORT_URL;
   }
 }

java/src/org/openqa/selenium/NotFoundException.java

@@ -17,19 +17,23 @@
 
 package org.openqa.selenium;
 
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+@NullMarked
 public class NotFoundException extends WebDriverException {
 
   public NotFoundException() {}
 
-  public NotFoundException(String message) {
+  public NotFoundException(@Nullable String message) {
     super(message);
   }
 
-  public NotFoundException(String message, Throwable cause) {
+  public NotFoundException(@Nullable String message, @Nullable Throwable cause) {
     super(message, cause);
   }
 
-  public NotFoundException(Throwable cause) {
+  public NotFoundException(@Nullable Throwable cause) {
     super(cause);
   }
 }

java/src/org/openqa/selenium/StaleElementReferenceException.java

@@ -17,24 +17,28 @@
 
 package org.openqa.selenium;
 
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
 /**
  * Indicates that a reference to an element is now "stale" --- the element no longer appears on the
  * DOM of the page.
  */
+@NullMarked
 public class StaleElementReferenceException extends WebDriverException {
 
   private static final String SUPPORT_URL = BASE_SUPPORT_URL + "#stale-element-reference-exception";
 
-  public StaleElementReferenceException(String message) {
+  public StaleElementReferenceException(@Nullable String message) {
     super(message);
   }
 
-  public StaleElementReferenceException(String message, Throwable cause) {
+  public StaleElementReferenceException(@Nullable String message, @Nullable Throwable cause) {
     super(message, cause);
   }
 
   @Override
-  public String getSupportUrl() {
+  public @Nullable String getSupportUrl() {
     return SUPPORT_URL;
   }
 }

java/src/org/openqa/selenium/WebDriverException.java

@@ -22,8 +22,11 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
 import org.openqa.selenium.net.HostIdentifier;
 
+@NullMarked
 public class WebDriverException extends RuntimeException {
 
   public static final String SESSION_ID = "Session ID";
@@ -37,15 +40,15 @@ public WebDriverException() {
     super();
   }
 
-  public WebDriverException(String message) {
+  public WebDriverException(@Nullable String message) {
     super(message);
   }
 
-  public WebDriverException(Throwable cause) {
+  public WebDriverException(@Nullable Throwable cause) {
     super(cause);
   }
 
-  public WebDriverException(String message, Throwable cause) {
+  public WebDriverException(@Nullable String message, @Nullable Throwable cause) {
     super(message, cause);
   }
 
@@ -58,7 +61,7 @@ public WebDriverException(String message, Throwable cause) {
    * @return the detail message string of this exception.
    */
   @Override
-  public String getMessage() {
+  public @Nullable String getMessage() {
     return getCause() instanceof WebDriverException
         ? super.getMessage()
         : createMessage(super.getMessage());
@@ -70,11 +73,11 @@ public String getMessage() {
    * @return the simple message string of this exception.
    * @see #getMessage()
    */
-  public String getRawMessage() {
+  public @Nullable String getRawMessage() {
     return super.getMessage();
   }
 
-  private String createMessage(String originalMessageString) {
+  private String createMessage(@Nullable String originalMessageString) {
     String supportMessage =
         Optional.ofNullable(getSupportUrl())
             .map(url -> String.format("For documentation on this error, please visit: %s", url))
@@ -105,7 +108,7 @@ public static String getHostInformation() {
         HostIdentifier.getHostName(), HostIdentifier.getHostAddress());
   }
 
-  public String getSupportUrl() {
+  public @Nullable String getSupportUrl() {
     return null;
   }