How to Resolve java.lang.runtimeexception in JavaScript to Java Calls

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Understanding the Error

When these two exceptions combine, you’re dealing with an exception thrown while calling a method through reflection, often hiding the real cause.

Diagnosing the Problem

Check the Java Method: Ensure that the Java method you're calling exists and is accessible. Verify that it has the correct visibility (public) and is invoked with the right parameters.

Exception Handling: Add adequate try-catch blocks in your Java method to catch any specific exceptions that might be thrown. For example:

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Debugging Information: Print the stack trace of the InvocationTargetException to understand the underlying cause:

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Common Causes

Null Pointer Exceptions: Ensure that any objects being accessed aren’t null.

Incorrect Method Signatures: Double-check that the method names and parameter types in your JavaScript exactly match those in your Java class.

Security Restrictions: Ensure that your applet or application has the required permissions to execute the method. Java applet security policies can sometimes block certain method calls.

Practical Steps

Validating Method Accessibility:

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Invocation from JavaScript:

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Enhanced Debugging:
Add detailed logging:

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Remember, careful validation and enhanced debugging information are your best tools to resolve this runtime exception seamlessly.