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Java Heap Space error in React Native – How to fix?

To fix Java Heap Space error in react native project, just add the heap size you wish to the app/build.gradle file.

android {
    dexOptions {
        javaMaxHeapSize "4g"

Here I’ve specified the Heap size to be 4gb.

This solution could also fix JVM Heap Space is exhausted error.

Expiring Daemon because JVM heap space is exhausted
> Task :app:transformDexArchiveWithDexMergerForRelease FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:transformDexArchiveWithDexMergerForRelease'.
> java.lang.OutOfMemoryError (no error message)
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