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what does exception in thread main mean

by Hattie Purdy IV Published 3 years ago Updated 2 years ago

The Exception in thread "main" suggests that this error has occurred in the main thread, the thread which is responsible for running Java application. This error can occur to any thread but if it happens in main thread then your program will crash.

The Exception in thread "main" suggests that this error has occurred in the main thread, the thread which is responsible for running the Java application. This error can occur to any thread, but if it happens in the main thread, then your program will crash.

Full Answer

How to fix exception in thread main?

How to fix "Exception in thread main" in java?

  • Example
  • Output
  • Types of exceptions. Checked Exception − A checked exception is an exception that occurs at the time of compilation, these are also called as compile time exceptions.
  • Exception in thread main. ...
  • Example. ...
  • Run time exception
  • Example. ...
  • Run time exception. ...
  • Handling runtime exceptions. ...
  • Example

How to deal with an exception in a thread?

  • If you need to add info to the exception. This is generally done by wrapping the exception.
  • You need to perform some cleanup or logic after an exception is thrown. Even then, the exception is usually rethrown.
  • You need to recover from the exception, and you are absolutely sure that you know how to do this.

How to check if a Java thread terminated with exception?

Threads in this program will be terminated in the following sequence:

  • The count-down thread will be the first one to terminate, when its clock reaches the 0 value.
  • The main thread is constantly checking the status of the count-down thread by calling count_down.isAlive (). ...
  • The normal clock thread is constantly checking its interruption status by calling isInterrupted (). ...

More items...

How to interrupt thread in Java?

Understanding Thread Interruption in Java

  • Example Use Case. Make a task that prints 0 through 9 on console. ...
  • An Implementation of the Use Case Using Thread. The inline comment against a line of code mentions the use case requirement that has been met by the line.
  • An Implementation of the Use Case Using the Executor. ...
  • InterruptedException and Interruption Status. ...
  • Summary. ...

How do I fix exception in thread main Java Lang NullPointerException?

In Java, the java. lang. NullPointerException is thrown when a reference variable is accessed (or de-referenced) and is not pointing to any object. This error can be resolved by using a try-catch block or an if-else condition to check if a reference variable is null before dereferencing it.

What scenarios cause exception in thread main?

Some of the common main thread exception scenarios are: Exception in thread main java. lang. UnsupportedClassVersionError: This exception comes when your java class is compiled from another JDK version and you are trying to run it from another java version.

How do I fix the exception in thread main error?

You can handle runtime exceptions and avoid abnormal termination but, there is no specific fix for runtime exceptions in Java, depending on the exception, type you need to change the code.

How do I fix exception in thread main Java Lang NoClassDefFoundError?

How to resolve java. lang. NoClassDefFoundError in Java The class is not available in Java Classpath. You might be running your program using the jar command and class was not defined in the manifest file's ClassPath attribute. Any start-up script is an overriding Classpath environment variable.More items...

What happens when exception occurs in thread?

In simple words, If not caught thread will die, if an uncaught exception handler is registered then it will get a call back. Thread. UncaughtExceptionHandler is an interface, defined as nested interface for handlers invoked when a Thread abruptly terminates due to an uncaught exception.

How do you fix an exception in Java?

The try-catch is the simplest method of handling exceptions. Put the code you want to run in the try block, and any Java exceptions that the code throws are caught by one or more catch blocks. This method will catch any type of Java exceptions that get thrown. This is the simplest mechanism for handling exceptions.

What happens when exception is thrown by main method?

- The main method should simply terminate if any exception occurs. The throws clause only states that the method throws a checked FileNotFoundException and the calling method should catch or rethrow it. If a non-checked exception is thrown (and not catch) in the main method, it will also terminate.

What causes NoClassDefFoundError?

java. lang. NoClassDefFoundError is runtime error thrown when a required class is not found in the classpath and hence JVM is unable to load it into memory.

How do I fix exception in thread main Java Util NoSuchElementException?

NoSuchElementException in Java can come while using Iterator or Enumeration or StringTokenizer. Best way to fix NoSuchElementException in java is to avoid it by checking Iterator with hashNext(), Enumeration with hashMoreElements() and StringTokenizer with hashMoreTokens().

How do I fix Java Lang ArrayIndexOutOfBoundsException?

Here are few handy tips to avoid ArrayIndexOutOfBoundsException in Java:Always remember that the array is a zero-based index, the first element is at the 0th index and the last element is at length - 1 index.Pay special attention to the start and end conditions of the loop.Beware of one-off errors like above.

What does NoClassDefFoundError mean?

Definition: Java Virtual Machine is not able to find a particular class at runtime which was available at compile time. If a class was present during compile time but not available in java classpath during runtime.

What is exception in thread main Java Lang IllegalStateException?

This exception is used to signal that a method is called at an illegal or inappropriate time. For example, once a thread has been started, it is not allowed to restart the same thread again. If such an operation is performed, the IllegalStateException is thrown.

What are the two types of exceptions in Java?

In Java There are two types of exceptions. Checked Exception − A checked exception is an exception that occurs at the time of compilation, these are also called as compile time exceptions. These exceptions cannot simply be ignored at the time of compilation; the programmer should take care of (handle) these exceptions.

Can you handle runtime exceptions?

Handling runtime exceptions. You can handle runtime exceptions and avoid abnormal termination but, there is no specific fix for runtime exceptions in Java, depending on the exception, type you need to change the code.

image

Types of Exceptions

Exception in Thread Main

  • The display pattern of the runtime exception/unchecked exception is "Exception in thread main"i.e. whenever a runtime exception occurs the message starts with this line.
See more on tutorialspoint.com

Example

  • In following Java program, we have an array with size 5 and we are trying to access the 6th element, this generates ArrayIndexOutOfBoundsException.
See more on tutorialspoint.com

Handling Runtime Exceptions

  • You can handle runtime exceptions and avoid abnormal termination but, there is no specific fix for runtime exceptions in Java, depending on the exception, type you need to change the code. For example, if you need to fix the ArrayIndexOutOfBoundsException in the first program listed above you need to remove/change the line that accesses index positon of the array beyond its size.
See more on tutorialspoint.com

Output

See more on tutorialspoint.com

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