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1Z0-811 Exception Handling and Development Tools Practice Question

What does the java command with -jar option do?

⚠ Common exam trap

Oracle often tests the misconception that `java -jar` compiles or manipulates the JAR file, when in fact it strictly executes the application defined in the manifest.

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Executes a JAR file by reading its manifest

The `java -jar` command executes a JAR file by reading the `Main-Class` entry from the JAR's manifest file (`META-INF/MANIFEST.MF`). This tells the Java launcher which class contains the `public static void main(String[] args)` method to start the application. It does not compile, list, or create JAR files.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    Compiles Java files inside the JAR

    Why it's wrong here

    compilation is done by javac.

  • ✓

    Executes a JAR file by reading its manifest

    Why this is correct

    java -jar runs the JAR with the class from manifest.

  • ✗

    Lists contents of the JAR file

    Why it's wrong here

    listing is done with jar tf.

  • ✗

    Creates a new JAR file

    Why it's wrong here

    Creating JAR files is done with jar command.

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This 1Z0-811 practice question is part of Courseiva's free Oracle certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 1Z0-811 exam.