Exception Handling and Development Tools

A method declares throws FileNotFoundException and SQLException. Which statement about the caller is true?

A developer is using the Oracle Java Platform Debugger Architecture (JPDA) to debug a remote Java application. Which command-line option is required to start the application in debug mode listening on port 5005?

A Java application uses a custom exception class that extends Exception. The application throws this exception from a method, but the method does not declare it in its throws clause. Which statement is true?

Which tool is used to generate documentation comments from Java source code?

Which statement about the Java compiler is true?

Given the stack trace above, which line in MyClass.java caused the exception? Exception in thread "main" java.lang.NullPointerException at MyClass.methodC(MyClass.java:25) at MyClass.methodB(MyClass.java:15) at MyClass.methodA(MyClass.java:10) at MyClass.main(MyClass.java:30)

A team is using a build tool to compile and package a Java application. They want to automatically run unit tests after compilation and before packaging. Which tool and configuration is most appropriate?

You are a Java developer at a financial firm. The application processes transactions from a queue. The team recently migrated from Java 8 to Java 11. After the migration, the application intermittently throws an exception: 'java.lang.reflect.InaccessibleObjectException: Unable to make field private final byte[] java.lang.String.value accessible: module java.base does not 'opens java.lang' to unnamed module'. This error occurs when the application tries to use reflection to access private fields of String objects for serialization. The application runs on a server where you cannot modify the JVM startup scripts. However, you can modify the application code and the module-info.java file. You need to resolve the exception without breaking existing functionality. Which approach should you take?

A developer encounters a ClassNotFoundException at runtime. The class is present in the source code and compiles fine. Which is the most likely cause?

What is the output if an ArithmeticException occurs in the try block and there is a finally block?

A developer writes a method that reads a file and parses its contents. Which exception handling approach is best practice for ensuring the file is properly closed even if an exception occurs?

You are maintaining a multi-threaded banking application that processes transactions. In the `processTransaction` method, you have a try-catch block that catches `Exception` to handle any unexpected errors. Recently, the application intermittently fails to update account balances correctly due to unhandled exceptions. The logs show that sometimes a `RuntimeException` is thrown from a nested method, but it is not being logged or handled properly, leading to inconsistent state. The team wants to improve the exception handling to ensure that all exceptions are caught, logged, and the transaction is rolled back properly. The method currently uses a primitive try-catch-finally where the finally block commits the transaction if no exception occurred. Which approach best addresses the issue while maintaining clarity and correctness?

Refer to the exhibit. A Java source file fails to compile with the given error. What change should be made to fix the error?

Consider the following code snippet: public int getValue() { try { return 1; } catch (Exception e) { return 2; } finally { return 3; } } What does the method return?

Which THREE statements about custom exceptions in Java are correct? (Select exactly 3)

Which THREE of the following are checked exceptions in Java?

Which TWO statements about the finally block are true? (Choose two.)

Which TWO of the following development tools are specifically designed to analyze module dependencies or create custom runtime images?

A method throws a checked exception. Which of the following is the correct way to handle it in the calling method?

Which command compiles a Java file and generates a .class file?

What does the java command with -jar option do?

Consider the following code: ```java import java.io.*; public class Test { public static void main(String[] args) throws IOException { try (FileInputStream fis = new FileInputStream("test.txt"); BufferedReader br = new BufferedReader(new InputStreamReader(fis))) { System.out.println(br.readLine()); } catch (IOException e) { System.out.println("Error"); } } } ``` Which statement about this code is true?

A developer writes a method that reads a file and must ensure the file is closed even if an exception occurs. Which construct should be used?

A developer writes a method that reads a file and processes its contents. If the file does not exist, the method should notify the caller. Which exception should the method declare in its throws clause?

Which THREE statements are true about the Java logging API (java.util.logging)?

A developer is debugging a Java application that throws a NullPointerException. Which two actions help identify the source of the exception? (Choose two.)

You are responsible for deploying a Java desktop application that uses JavaFX and various third-party libraries. The application is modular and uses JPMS. To reduce the footprint and startup time, you decide to use jlink to create a custom runtime image that includes only the required modules. The application has a main module `com.myapp` that requires `javafx.controls`, `javafx.base`, and some other modules. After creating the runtime image using the command `jlink --module-path $JAVA_HOME/jmods:lib --add-modules com.myapp --output myapp-image`, you test the image on a development machine, and it works. However, when deploying to a customer's machine, the application fails to start with an error: "Error: Could not find or load main class com.myapp.Main". The customer's machine has no Java installed. The runtime image includes the `com.myapp` module. You verify that the `myapp-image/bin/java` launcher exists. The main class is correctly declared in the module-info.java of `com.myapp`. What is the most likely cause of this error?

Which TWO are valid ways to handle a checked exception in a method?

A developer tries to compile a modular Java application using the command shown in the exhibit. The compilation fails with the error shown. What is the most likely cause?

A developer is using try-with-resources with a custom resource class that implements AutoCloseable. The class's close() method throws a custom exception `ResourceException`. In the try block, an IOException occurs. Which of the following best describes the exception that is propagated to the caller?

A team is designing a library that handles network timeouts. They create a custom exception `NetworkTimeoutException` that extends `Exception`. They want to ensure that callers are forced to handle this exception. Which declaration is appropriate for a method that throws this exception?

Which of the following exceptions is a checked exception?

Which THREE are checked exceptions in Java? (Choose three.)

Given the compilation error above, which fix would resolve the error?

Which TWO command-line tools are included in the Oracle JDK for monitoring and troubleshooting Java applications? (Select exactly 2)

A custom exception class must extend which class to be a checked exception?

Which TWO of the following are best practices for exception handling in Java?

When using try-with-resources, which interface must the resource implement?

Refer to the exhibit. Which action would best resolve this error without changing the code?

Arrange the steps to use a for loop to iterate over an array in Java in the correct order.

Which TWO statements are true about the finally block in exception handling? (Select exactly 2)

Refer to the exhibit. A developer encounters this exception when running the application. The method divide is intended to handle division by zero. What is the most likely cause of the exception?

A developer writes a method that reads a file and processes its contents. The method uses a BufferedReader wrapped around a FileReader. Which of the following approaches ensures that both resources are properly closed even if an exception occurs?

Given a method that catches Exception and then throws a RuntimeException, what is the effect?

Match each Java keyword to its use.

Given the following try-catch block: try { // some code } catch (IOException | NumberFormatException e) { e = new IOException("wrapper"); // throw e; } Which line causes a compilation error?

Which of the following is the best practice for resource management in Java?

You are a junior developer tasked with generating API documentation for a large Java project. The project uses Javadoc comments extensively, and you need to generate HTML documentation that includes all public and protected classes and methods. You have access to the source files in the `src` directory, and you want the output to be placed in a `docs` folder. Additionally, you want to include a custom header and footer in each generated page. The project uses multiple packages like `com.example.app`, `com.example.util`, and `com.example.data`. You plan to run the javadoc command from the project root. Which command should you use?

Which command is used to run a Java application from the command line?

Consider a Java application that throws a NullPointerException deep inside a library method. The stack trace does not include the caller's line numbers because the library was compiled without debug information. Which approach would best help identify the root cause?

A developer is maintaining a Java backend service for order processing. The service uses a third-party library that throws a checked PaymentException when a payment fails. The current processOrder method catches Exception generically, logs the error, and returns null. The business requires that when a payment fails, the order status must be updated to 'FAILED' in the database, and a notification must be sent to the customer. However, due to the generic catch, these actions are not performed. The developer must modify the code to meet the business requirements without changing the external API of the class (i.e., the method signature must remain the same and must not throw any exceptions to the caller). Which course of action should the developer take?

A developer needs to handle a specific checked exception, FileNotFoundException, but also wants to catch any other IOException that might occur. Which catch block ordering is correct?

Refer to the exhibit. A Java program throws a NullPointerException. Which is the most likely cause?

A developer compiles a Java application using the command `javac -d bin src/com/example/App.java`. Which of the following is true?

A developer encounters an ArrayIndexOutOfBoundsException while running a unit test. The stack trace shows the error occurs in a method that is called from many places. Which tool or technique would most efficiently identify the specific call path?

A developer writes a catch block that handles multiple exception types that have a subclass relationship. Which of the following is a valid use of the multi-catch feature?

A team is developing a Java application that uses many third-party libraries. One library throws a checked exception that is not declared in its method signature. Which approach best handles this situation?

Which TWO are benefits of using try-with-resources?

Refer to the exhibit. Which statement is true about the InvalidInputException class?