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Solving java.util.ConcurrentModificationException in Android Crashlytics
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Discover how to effectively troubleshoot and resolve `ConcurrentModificationException` errors in your Android app using Crashlytics, with practical solutions and preventative measures.
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Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: android crashlytics shows a crash but doesn't show where in my classes
If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Troubleshooting ConcurrentModificationException in Your Android App
Understanding ConcurrentModificationException
The ConcurrentModificationException occurs when a collection (like an ArrayList) is modified while it is simultaneously iterated over. This can happen if your app's code attempts to add, remove, or modify items in a list while you are processing or iterating through that same list in another part of your code. The stack trace from Crashlytics may indicate that the problem arises from code using Kotlin Coroutines, specifically around flow processing, but it won't tie back to the specific location in your code due to ProGuard obfuscation.
Why Does ProGuard Matter?
ProGuard is a tool that shrinks, optimizes, and obfuscates your code. While it helps protect your app from reverse engineering, it may also obscure stack trace information, making it harder to pinpoint the exact cause of crashes. If you're using ProGuard and have minification enabled, you might not see clear references to your classes in the Crashlytics logs, adding an extra layer of complexity to debugging.
Steps to Investigate the Crash
Identify Flow Usage: Begin by finding all areas in your project where you are using .asFlow() or other flow builders in combination with terminal operators such as collect(), first(), or single(). These parts of your code could be prime areas to examine for concurrent modifications.
Implement Error Handling: Wrap each flow’s collect operation, and other terminal calls in a try/catch block. This will help trap the exception and log it clearly, allowing you to identify the specific operation causing the crash. For example:
[[See Video to Reveal this Text or Code Snippet]]
Logging: After catching the exception, log a message that provides context as to which flow was being processed at the time of the error. This can be invaluable in tracking down the root cause.
Inspect List Modifications: Review how and when you modify lists in your code. Pay attention to any concurrent flows or coroutines that may be accessing or modifying the same list simultaneously. Consolidate accesses and modifications to ensure they are executed sequentially.
Preventing Future Issues
To avoid running into similar issues in the future, consider implementing some of the following best practices:
Use Concurrent Collections: If you are frequently modifying collections in a multithreaded context, consider using collections that support concurrent modifications, like CopyOnWriteArrayList.
Synchronize Access: Implement synchronization mechanisms around critical sections of code where shared mutable data is accessed and modified.
Immutability: Utilize immutable collections whenever possible. This reduces the risk of concurrent modification as immutable data structures cannot be altered after their creation.
Testing: Conduct thorough testing to simulate different user interactions in the app that could cause data races or concurrent modifications.
Conclusion
Dealing with ConcurrentModificationException in your Android applications can be tricky, especially when Crashlytics does not clearly point to the sourc
---
Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: android crashlytics shows a crash but doesn't show where in my classes
If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Troubleshooting ConcurrentModificationException in Your Android App
Understanding ConcurrentModificationException
The ConcurrentModificationException occurs when a collection (like an ArrayList) is modified while it is simultaneously iterated over. This can happen if your app's code attempts to add, remove, or modify items in a list while you are processing or iterating through that same list in another part of your code. The stack trace from Crashlytics may indicate that the problem arises from code using Kotlin Coroutines, specifically around flow processing, but it won't tie back to the specific location in your code due to ProGuard obfuscation.
Why Does ProGuard Matter?
ProGuard is a tool that shrinks, optimizes, and obfuscates your code. While it helps protect your app from reverse engineering, it may also obscure stack trace information, making it harder to pinpoint the exact cause of crashes. If you're using ProGuard and have minification enabled, you might not see clear references to your classes in the Crashlytics logs, adding an extra layer of complexity to debugging.
Steps to Investigate the Crash
Identify Flow Usage: Begin by finding all areas in your project where you are using .asFlow() or other flow builders in combination with terminal operators such as collect(), first(), or single(). These parts of your code could be prime areas to examine for concurrent modifications.
Implement Error Handling: Wrap each flow’s collect operation, and other terminal calls in a try/catch block. This will help trap the exception and log it clearly, allowing you to identify the specific operation causing the crash. For example:
[[See Video to Reveal this Text or Code Snippet]]
Logging: After catching the exception, log a message that provides context as to which flow was being processed at the time of the error. This can be invaluable in tracking down the root cause.
Inspect List Modifications: Review how and when you modify lists in your code. Pay attention to any concurrent flows or coroutines that may be accessing or modifying the same list simultaneously. Consolidate accesses and modifications to ensure they are executed sequentially.
Preventing Future Issues
To avoid running into similar issues in the future, consider implementing some of the following best practices:
Use Concurrent Collections: If you are frequently modifying collections in a multithreaded context, consider using collections that support concurrent modifications, like CopyOnWriteArrayList.
Synchronize Access: Implement synchronization mechanisms around critical sections of code where shared mutable data is accessed and modified.
Immutability: Utilize immutable collections whenever possible. This reduces the risk of concurrent modification as immutable data structures cannot be altered after their creation.
Testing: Conduct thorough testing to simulate different user interactions in the app that could cause data races or concurrent modifications.
Conclusion
Dealing with ConcurrentModificationException in your Android applications can be tricky, especially when Crashlytics does not clearly point to the sourc