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Home Articles

Exceptions and Errors In Java- All You Need To Know

by Ayesha Surayya
November 20, 2022
in Articles, Java Programming
Exceptions and Errors In Java- All You Need To Know
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Table of Contents

  • The concept of exception handling
  • Java Exceptions Hierarchy
  • Types of exceptions in Java
  • What is an Error in Java
  • Difference between Exception and Error

Java exception is one of the most important concepts of Java programming. If you’re a beginner, you should get a basic understanding of how Java exception works and how you can utilize it in your programming. Java Exception is a simple mechanism for handling runtime errors. If we try to understand “exception” in general, it relates to errors that take place while executing a program. Exception handling is also used in C# programming language. So, if you get an idea of how exception handling works in Java, you can easily use it in other programming languages as well.

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The concept of exception handling

At its core, a program is a set of instructions. To run properly, it should not have any logical, runtime, or syntax errors. Whenever a program encounters any runtime error, an exception is raised. The exception object is then thrown by the program, which is handled by the exception handler. Since everything in Java is an object, that means exceptions created by programs are also objects. These objects contain information about the type of exception, as well as additional data that needs to be transmitted.

Example:

#FileNotFoundException

try {
nfile = new File(“abc.txt”);
nfile.readLine;
nfile.write(“another item for the list”);
nfile.close();
} catch (FileNotFoundException fnfe) {
system.out.write(“File not found, Please make sure that the file is present in the location or you are entering the correct file name”);
}

The above is a try-catch code that tries to create a new file. If the creation fails or the file is not present at the current location, the code in the try should throw an exception object. The FileNotFoundException handles the exception object. The coder can either print a statement or perform an action that handles the situation correctly.

Some examples of when exceptions can happen are:

  • Dividing by zero
  • Accessing Array element with an out of bounds index.
  • Passing an incorrect argument to a method.

Java Exceptions Hierarchy

The class at the top of the exception class hierarchy is the Throwable class, which is a direct subclass of the Object class. Throwable has two direct subclasses – Exception and Error.

The Exception class is used for exception conditions that the application may need to handle. Examples of exceptions include IllegalArgumentException, ClassNotFoundException and NullPointerException.

The Error class is used to indicate a more serious problem in the architecture and should not be handled in the application code. Examples of errors include InternalError, OutOfMemoryError and AssertionError.

Exceptions are further subdivided into checked (compile-time) and unchecked (run-time) exceptions. All subclasses of RuntimeException are unchecked exceptions, whereas all subclasses of Exception besides RuntimeException are checked exceptions.

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Types of exceptions in Java

Checked Exceptions

Exceptions that can occur at compile-time are called checked exceptions since they need to be explicitly checked and handled in code. Classes that directly inherit Throwable – except RuntimeException and Error – are checked exceptions e.g. IOException, InterruptedException etc.

Here is an example of a method that handles a checked exception:

public void writeToFile() {try (BufferedWriter bw = new BufferedWriter(new FileWriter(“myFile.txt”))) {        bw.write(“Test”);    } catch (IOException ioe) {        ioe.printStackTrace();    }}

In this example, both statements within the try block (the instantiation of the BufferedWriter object and writing to file using the object) can throw IOException, which is a checked exception and therefore needs to be handled either by the method or its caller. In the example, IOException is handled within the method and the exception stack trace is printed to the console.

Furthermore, the BufferedWriter object is a resource, which should be closed when it is no longer needed and closing it can throw an IOException as well. In such cases where closing resources themselves can throw exceptions, using a try-with-resources block is best practice since this takes care of the closing of resources automatically. The example shown earlier uses try-with-resources for exactly this reason.

Unchecked Exceptions

Unchecked exceptions can be thrown “at any time” (i.e. run-time). Therefore, methods don’t have to explicitly catch or throw unchecked exceptions. Classes that inherit RuntimeException are unchecked exceptions e.g. ArithmeticException, NullPointerException.

Here is an example of a method that throws an unchecked exception (NullPointerException) which is not handled in code:

public void writeToFile() {try (BufferedWriter bw = null) {        bw.write(“Test”);    } catch (IOException ioe) {        ioe.printStackTrace();    }}

When the above method is called, a NullPointerException is thrown because the BufferedWriter object is null:

Exception in thread “main” java.lang.NullPointerException    at IOExceptionExample.writeToFile(IOExceptionExample.java:10)    at IOExceptionExample.main(IOExceptionExample.java:17)

As mentioned, since NullPointerException is an unchecked exception, it did not need to be handled in code – only the checked exception (IOException) was handled.

What is an Error in Java

In Java, an error is a subclass of Throwable that tells that something serious problem is existing and a reasonable Java application should not try to catch that error. Generally, it has been noticed that most of the occurring errors are abnormal conditions and cannot be resolved by normal conditions. As these errors are abnormal conditions and should not occur, thus, error and its subclass are referred to as Unchecked Exceptions. In Java, we have the concept of errors as well as exceptions. Thus there exist several differences between an exception and an error. Errors cannot be solved by any handling techniques, whereas we can solve exceptions using some logic implementations. So, when an error occurs, it causes termination of the program as errors cannot try to catch.

Error Name Description
AbstractMethodError When a Java application tries to invoke an abstract method.
Error Indicating a serious but uncatchable error is thrown. This type of error is a subclass of Throwable.
AssertionError To indicate that an assertion has failed.
ClassCircularityError While initializing a class, a circularity is detected.
IllegalAccessError A Java application attempts either to access or modify a field or maybe invoking a method to which it does not have access.
ClassFormatError When JVM attempts to read a class file and find that the file is malformed or cannot be interpreted as a class file.
InstantiationError In case an application is trying to use the Java new construct for instantiating an abstract class or an interface.
ExceptionInInitializerError Signals that tell an unexpected exception have occurred in a static initializer.
InternalError Indicating the occurrence of an unexpected internal error in the JVM.
IncompatibleClassChangeError When an incompatible class change has occurred to some class of definition.
LinkageError Its subclass indicates that a class has some dependency on another data.
NoSuchFieldError In case an application tries to access or modify a specified field of an object, and after it, that object no longer has this field.
OutOfMemoryError In case JVM cannot allocate an object as it is out of memory, such error is thrown that says no more memory could be made available by the GC.
NoClassDefFoundError If a class loader instance or JVM, try to load in the class definition and not found any class definition of the class.
ThreadDeath Its instance is thrown in the victim thread when in thread class, the stop method with zero arguments is invoked.
NoSuchMethodError In case an application tries to call a specified method of a class that can be either static or instance, and that class no longer holds that method definition.
StackOverflowError When a stack overflow occurs in an application because it has recursed too deeply.
UnsatisfiedLinkError In case JVM is unable to find an appropriate native language for a native method definition.
VirtualMachineError Indicate that the JVM is broken or has run out of resources, essential for continuing operating.
UnsupportedClassVersionError When the JVM attempts to read a class file and get to know that the major & minor version numbers in the file are unsupportable.
UnknownError In case a serious exception that is unknown has occurred in the JVM.
VerifyError When it is found that a class file that is well-formed although contains some sort of internal inconsistency or security problem by the verifier.

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Difference between Exception and Error

Exception Error
Can be handled Cannot be handled.
Can be either checked type or unchecked type Errors are of unchecked type
Thrown at runtime only, but the checked exceptions known by the compiler and the unchecked are not. Occurs at the runtime of the code and is not known to the compiler.
They are defined in Java.lang.Exception package. They are defined in Java.lang.Error package
Program implementation mistakes cause exceptions. Errors are mainly caused because of the environment of the program where it is executing.

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Ayesha Surayya

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