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1. NULL POINTER EXCEPTION ERROR PARALLELS TOOLBOX ANDROID
2. NULL POINTER EXCEPTION ERROR PARALLELS TOOLBOX CODE

During such optimizations, the specific helpful messages of NPEs can be lost, but that’s the price to be paid for the gained performance benefits.

NULL POINTER EXCEPTION ERROR PARALLELS TOOLBOX CODE

Starting with Kotlin 1.4, this code will throw a NullPointerException instead with the same message, “JavaCode.getNull() must not be null”.Īfter this change of behavior, the optimizers will be able to decrease the total number of null-checks present in the bytecode by removing repetitive null-checks when possible: since all checks throw the same NPE exception, only one can remain. Right before the duplicate function call at line 1, a special check is generated which throws this exception if the expression JavaCode.getNull() stores null. For instance, the following code currently throws an IllegalStateException with the error message “JavaCode.getNull() must not be null”: The type of exception changes, but the information passed stays the same. Note that from a developer’s perspective, things won’t change that much: the Kotlin code will throw exceptions with the same error messages as before. This doesn’t apply to lateinit null checks and explicit library function calls like checkNotNull or requireNotNull. This applies to: the !! operator, parameter null checks in the method preamble, platform-typed expression null checks, and the as operator with a non-null type. To solve this, starting from Kotlin 1.4, all runtime null checks will throw a instead of a KotlinNullPointerException, IllegalStateException, IllegalArgumentException, and TypeCastException.

NULL POINTER EXCEPTION ERROR PARALLELS TOOLBOX ANDROID

It turned out that this approach has its disadvantages: it reduces possible null check optimizations that can be performed either by the Kotlin compiler or by various kinds of bytecode processing tools, such as the Android R8 optimizer.

To help developers better understand the source of a nullability problem if it occurs, Kotlin compiler throws different types of runtime exceptions with clear error messages instead of pure NPEs. However, because of interoperability with Java code, it’s impossible to avoid NPEs completely. Now let’s dive into the details! Null-check optimizations planned for Kotlin 1.4Īs you probably know, Kotlin decreases the possibility of NullPointerExceptions by providing support for nullable types. As always, we’d like to thank our external contributors. You can find the complete list of changes in the change log.