Java runtime not working

How to Solve the Most Common Runtime Errors in Java

A runtime error in Java is an application error that occurs during the execution of a program. A runtime error occurs when a program is syntactically correct but contains an issue that is only detected during program execution. These issues cannot be caught at compile-time by the Java compiler and are only detected by the Java Virtual Machine (JVM) when the application is running.

Runtime errors are a category of exception that contains several more specific error types. Some of the most common types of runtime errors are:

• IO errors
• Division by zero errors
• Out of range errors
• Undefined object errors

Runtime Errors vs Compile-Time Errors

Compile-time errors occur when there are syntactical issues present in application code, for example, missing semicolons or parentheses, misspelled keywords or usage of undeclared variables.

These syntax errors are detected by the Java compiler at compile-time and an error message is displayed on the screen. The compiler prevents the code from being executed until the error is fixed. Therefore, these errors must be addressed by debugging before the program can be successfully run.

On the other hand, runtime errors occur during program execution (the interpretation phase), after compilation has taken place. Any code that throws a runtime error is therefore syntactically correct.

Runtime Errors vs Logical Errors

A runtime error could potentially be a legitimate issue in code, for example, incorrectly formatted input data or lack of resources (e.g. insufficient memory or disk space). When a runtime error occurs in Java, the compiler specifies the lines of code where the error is encountered. This information can be used to trace back where the problem originated.

On the other hand, a logical error is always the symptom of a bug in application code leading to incorrect output e.g. subtracting two variables instead of adding them. In case of a logical error, the program operates incorrectly but does not terminate abnormally. Each statement may need to be checked to identify a logical error, which makes it generally harder to debug than a runtime error.

What Causes Runtime Errors in Java

The most common causes of runtime errors in Java are:

• Dividing a number by zero.
• Accessing an element in an array that is out of range.
• Attempting to store an incompatible type value to a collection.
• Passing an invalid argument to a method.
• Attempting to convert an invalid string to a number.
• Insufficient space in memory for thread data.

When any such errors are encountered, the Java compiler generates an error message and terminates the program abnormally. Runtime errors don’t need to be explicitly caught and handled in code. However, it may be useful to catch them and continue program execution.

To handle a runtime error, the code can be placed within a try-catch block and the error can be caught inside the catch block.

Runtime Error Examples

Division by zero error

Here is an example of a java.lang.ArithmeticException , a type of runtime exception, thrown due to division by zero:

public class ArithmeticExceptionExample < public static void main(String[] args) < int a = 10, b = 0; System.out.println("Result: "+ a/b); >>

In this example, an integer a is attempted to be divided by another integer b , whose value is zero, leading to a java.lang.ArithmeticException :

Exception in thread "main" java.lang.ArithmeticException: / by zero at ArithmeticExceptionExample.main(ArithmeticExceptionExample.java:4)

Accessing an out of range value in an array

Here is an example of a java.lang.ArrayIndexOutOfBoundsException thrown due to an attempt to access an element in an array that is out of bounds:

public class ValueOutOfRangeErrorExample < public static void main(String[] args) < int arr[] = new int[5]; System.out.println("5th element in array: " + arr[5]); >>

In this example, an array is initialized with 5 elements. An element at position 5 is later attempted to be accessed in the array, which does not exist, leading to a java.lang.ArrayIndexOutOfBoundsException runtime error:

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Index 5 out of bounds for length 5 at ValueOutOfRangeErrorExample.main(ValueOutOfRangeErrorExample.java:4)

How to Solve Runtime Errors

Runtime errors can be handled in Java using try-catch blocks with the following steps:

• Surround the statements that can throw a runtime error in try-catch blocks.
• Catch the error.
• Depending on the requirements of the application, take necessary action. For example, log the exception with an appropriate message.

To illustrate this, the code in the earlier ArithmeticException example can be updated with the above steps:

public class ArithmeticExceptionExample < public static void main(String[] args) < try < int a = 10, b = 0; System.out.println("Result: " + a/b); >catch (ArithmeticException ae) < System.out.println("Arithmetic Exception: cannot divide by 0"); >System.out.println("Continuing execution. "); > > 

Surrounding the code in try-catch blocks like the above allows the program to continue execution after the exception is encountered:

Arithmetic Exception: cannot divide by 0 Continuing execution…

Runtime errors can be avoided where possible by paying attention to detail and making sure all statements in code are mathematically and logically correct.

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3 Quick Ways to Fix Java Runtime Environment not Found

Try these fixes to resolve Java Runtime Environment not found error

Passionate about technology, Windows, and everything that has a power button, he spent most of his time developing new skills and learning more about the tech world. Coming. read more

Passionate about technology, Windows, and everything that has a power button, he spent most of his time developing new skills and learning more about the tech world. Coming. read more

• A Java Runtime error might appear if you have installed an older JRE software.
• If you have wondered how to fix Java issues, reinstalling it can help you.
• To fix the Java Runtime Environment not found error, make sure to have the latest version of Java.
• Download the JRE version that corresponds with your system type so you won’t deal with other types of Java issues.

To fix Windows PC system issues, you will need a dedicated tool Fortect is a tool that does not simply cleans up your PC, but has a repository with several millions of Windows System files stored in their initial version. When your PC encounters a problem, Fortect will fix it for you, by replacing bad files with fresh versions. To fix your current PC issue, here are the steps you need to take:

The Java Development Kit (JDK), the Java Virtual Machine (JVM), and the Java Runtime Environment (JRE) form a trio of Java platform components for developing and running Java apps.

A runtime environment is a piece of software designed to run other software. For example, as the runtime environment for Java, the JRE contains the Java class libraries, the Java class loader, and the JVM.

So if you don’t have JRE installed or you have an older version of the software, you might encounter one of the following messages:

• Error: Could not find Java SE Runtime Environment – you don’t have the Java SE version installed on your system
• This application needs version 1.x or higher of the Java Runtime Environment – you should update your Java version to the latest you can find on the official website
• A Java Runtime Environment(JRE) or Java Development Kit (JDK) must be available to run this app – like the first error, check if you have installed JRE or JDK and if not, install them

Today’s guide will explore the most efficient and easy methods to resolve the Java Runtime Environment not found and the other similar errors with Java. Read on for more details.

Why is JRE not installed?

In Windows and macOS, installing the Java Developmental Kit (JDK) in previous releases optionally installed a Java Runtime Environment (JRE).

However, with JDK 11, Oracle removed JRE to be installed optionally. Therefore, with JDK 11 release, the JRE or Server JRE is no longer offered, and only the JDK is provided.

Also, the Java Runtime Environment not found it could be caused by several other reasons, which we have listed below.

• Java is not installed on your PC.
• Java installation was not completed due to some errors.
• The environment variables of Java are not set.
• You might have more than one Java Runtime installation.
• A Windows misconfiguration can also trigger this problem.

How do I fix the Java runtime environment not found?

1. Run Windows troubleshooter

1. Select Start , and click on Settings.
2. Choose Update & Security , and then click Troubleshoot.
3. Select the type of troubleshooting you want to run, then select Run the troubleshooter.
4. Allow the troubleshooter to run and then answer any questions on the screen.

Some PC issues are hard to tackle, especially when it comes to missing or corrupted system files and repositories of your Windows.
Be sure to use a dedicated tool, such as Fortect, which will scan and replace your broken files with their fresh versions from its repository.

You can try the recovery options if you see a message that no changes or updates are necessary . This is a built-in troubleshooter tool from Windows 10.

2. Download Java Runtime Environment (JRE)

1. Download JRE from the official website.
2. Choose if you need a 32bit or a 64bit architecture of JRE based on your PC specifications.
3. Click on the Agree and download button to start the actual download.

If you don’t know which version of Java is the correct version for your system, you can find out by searching in the Start menu the term System Information.

It would be best if you opened the first option that appears after the search and then checked the value under System Type (32-bit or 64-bit).

Read more about this topic

3. Install Java Runtime Environment (JRE)

1. Right-click on the downloaded JRE setup file.
2. Select Run as administrator and accept the installation prompt.
3. Click on the Install button to complete the installation.
4. You will receive a message that the installation was successful. Next, click on close the complete the installation and close the window.

We recommend you check if there is a new Java update each time you encounter this issue. Unfortunately, the software will not update automatically, so you must perform this task manually.

How can I fix Java Runtime Environment not found on Windows 11?

The above solutions also work perfectly well for Windows 11 PC. So, to summarize the answers, here’s what you can do to fix the Java Runtime Environment not found on Windows 11.

• Uninstall all Java versions from your PC and install the latest one from the official website.
• Configure the Environment Variables for Java on your PC.
• Reset your PC.
• Check for viruses or malware.

Where is JRE located?

1. Open the Start menu.
2. Click on Control Panel.
3. Select Java.
4. Switch to the Java tab.
5. Click View.
6. Check the Path column for the version of the JRE you have installed.
7. You will see a path. For example C:\apps\jdk\jre\bin\javaw.exe
8. So, the path is C:\apps\jdk\bin

That is it. You should now have the latest version of Java Runtime Environment on your PC and no longer receive the error message.

Please write us in a comment below if these solutions helped you or if there are any other suggestions that we should include in our article.

Still experiencing issues?

If the above suggestions have not solved your problem, your computer may experience more severe Windows troubles. We suggest choosing an all-in-one solution like Fortect to fix problems efficiently. After installation, just click the View&Fix button and then press Start Repair.

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